Tuned Vanguard Microlight Aircraft Engine, first run

[@KevinArmstrong4154]

If it won't put up with five minutes running without an exhaust, it isn't good enough to fly me across 21 miles of English Channel...I fitted stainless exhaust valves so they will stand more heat than the stock items. Since those days it has done two solid four hour flights without complaint, and still runs sweetly. Thirty odd hours running and had the plugs out, clean, compression is good and tappers are holding exact clearances. This is no short life hand grenade but a tough industrial engine

[@KevinArmstrong4154]

The motor has stainless exhaust valves, and was being run unloaded, strictly time limited as a precaution. So far in flight testing has no valve or compression issues, I built an exhaust after researching length and bore of the pipes using 'net calculators, ideally 1.25" outside or 29mm bore, with a tuned length of around 40" or 1m. Silencer was more tricky, but ended up with a fat expansion vessel on the end of siamesed pipes via a Kinner Cycles swivel joint, then a punched tube baffle to outside air. Climb performance is similar to a 447 Rotax two stroke, 39bhp.

[@KevinArmstrong4154]

Reduction drive is machined up by Ace Aviation and support and sales in the UK is via Brian Fallows, first one was a joint design effort between Ace Aviation and my engineering firm. Now sold worldwide, mine's got 120 hours on and only one adjustment after bedding in. No wear signs at all, also fit Kohler , Honda, Generac, Subaru with the SAE hole pattern.and works upside down where the prop is lower than the crank centreline. Cheers

[@caseykelso1]

Awesome!

[@KevinArmstrong4154]

This test was to ensure the heavy duty starter would spin it, as the higher compression, hot cam minus stock decompressor and light flywheel defeated the normal starter motor. Puzzled why folk keep going on about this, once installed in the aircraft it always would have long tuned pipes and silencer. Plenty of Merlin engines in WW2 without pipes...;-)

[@KevinArmstrong4154]

150 flying hours on it now, stripped and checked recently and no wear or problems, stainless exhaust valves fitted. This was just a short run to test the upgraded starter as high compression meant the stock one couldn't turn it over. check out my flying videos

[@JamesSmith-op7yc]

James Smith here, I really appreciate you sharing this with us. I'm looking to use a Vanguard for an ultralight aircraft. If you could tell people about the build, thats very cool. Looking great and best of luck with your project. Happy New Year to you and yours. J.

[@KevinArmstrong4154]

private message your email and I can send you my Dropbox link

[@KevinArmstrong4154]

just passed 113 hours and with 4 hour flights behind it now. Fuel burn was 6.22 litres per hour but prop changes mean this is closer to 5 litres per hour, both on long flights at cruise, without using the leaning device

[@iplaymytele]

Sounds great…! I caught flack when I put my 670 Predator V twin, in my 1961 Cushman Eagle 🦅 and did a test run of it…! Guys were saying you will burn your exhaust valves..! I don’t think five minutes of running the motor with short Header tubes was going to do any damage to the motor while testing everything out….! I’m 68 years old…! And have been a gear head my entire life …! I do not recall ever BURNING any Exhaust valves, while Running a motor without a exhaust system for a while….! Hell Indian Harley Davidson and most every fast board track racer, had almost a nonexistent exhaust system…! In fact Indian made a couple racers that just used a deflector plate as the exhaust came straight out of the exhaust port….! You can see my Cushman on my KZbin channel with me testing the motor with no exhaust system …! ( The Jeff Galey Channel ) “ 670 V Twin Predator in my 1961 Cushman Eagle,First Start Up “

[@mervynevans5176]

El mejor motor. Confiable y súper económico. No gasta casi nada

[@KevinArmstrong4154]

Pistões superiores côncavos rasos para maior compressão, árvore de cames de 280 ° e alavancas de balancim de válvula de alta elevação e, em seguida, adicionou o carburador do motor de 990 cc, que possui gargantas de entrada de 30 mm em vez de 23 mm. Use os jatos de combustível para o modelo de 5000 pés ou a mistura ficará muito rica

[@KevinArmstrong4154]

You are so right; now it has a prop on it spins up much easier.

[@tatelyle1]

I love the fuel line, just above the exhausts........ ;-)

[@KevinArmstrong4154]

Tested the flywheel up to 6500 by hanging it off a starter motor and spinning it to top revs. Not taken the engine past 5000rpm, when Mudbuddy use this engine they limit it to 5200, I fitted packers to the valve springs and stronger spring caps and rockers to stand the higher speeds, plus billet con rods.

[@KevinArmstrong4154]

A friend bought the same base engine in Indonesia, but you may struggle to get the tuning parts for the inside from Performance V-Twins, so may have to find USA suppliers that will send you a camshaft and upgraded rocker arns

[@KevinArmstrong4154]

The carb now is off the 61" engine, 990cc and is 30mm chokes instead of 23mm, this is a big increase in throat area. Jets were fine although I fitted the 5000' jets to lean it a little. You need to open up the inlet elbow to clear the butterflies, my aircraft will climb slowly with stock carb and rapidly with the big carb, makes a BIG difference! Part number is 845273 and they cost about $200 in the USA

[@feriirawan6472]

the engine is still crazy wheel setandar

[@Triple_J.1]

All these people freaking out about no exhaust manifolds. They dont realize the exhaust jets create more thrust than the propeller above Mach 1.5.

[@dirtbikebf]

Hey Charlie, I am able to get parts for the smaller briggs too, I already have a pair of stainless exhaust valves in stock and will look into what further parts are available. Drop me a line and we'll take it from there. Brian

[@wakeywakey9214]

Fantastic Kevin, can't wait to get involved in this project... B&S EFI engine might be the answer to cheap Flexing flying SSDR , Am a Royal Engineer building bridges & disarming mines, so the wrong field, but I have knowledge in CAD and have access to a CNC machine... I look forward to you send me your Dropbox.

[@KevinArmstrong4154]

private message me your email and I will add you to the access list

[@wakeywakey9214]

Kevin Armstrong [e-mail]

[@KevinArmstrong4154]

Redrive was designed on my CAD system, then machined up by Ace Aviation, run by John in India, he's just supplied three to a friend in the UK. aceaviation.co.uk Workmanship was good, well finished and accurately made. Cheers Kev

[@caseykelso1]

I need to get new software . I fat finger G and M codes into my pc then upload it to the haas .

[@KevinArmstrong4154]

Brian's fixed now, even cycling to restore fitness, on holiday this week Aircraft don't need a rev limiter, as the propeller absorbs power to the cube rule, so a small increase in revs takes a LOT of extra torque. This means if a prop's attached and set correctly it is impossible to overspeed the engine, mine stays under 4,300 no matter what I do. On a Kart or similar if you lift a wheel you can easily blow it up, swamp boats are the same and that's why Mudbuddy sell a rev limiter in the USA. You aren't supposed to tune old engines but why not? if it blows up you only end up paying for a new one anyway, so why lay out the dosh without trying the mods...

[@CharlieTibbles]

hi, ok nice thats good to know, and oh right ok, the only problem i can think is the performance parts that Brian sells may not fit my engine anyway as it is the old model the 20hp one. thanks for your help much appreciated

[@dirtbikebf]

CharlieTibbles Charlie, please see post above re. Tuning parts

[@CharlieTibbles]

dirtbikebf i have read it several times, but i have the old 20hp model 351447 and the tuning parts may be only available for the new models, that's why i was asking.

[@BigSwede500]

Great sound!!

[@KevinArmstrong4154]

engine now flying again, see latest video, went to 7000 with engine temps stable

[@mikecorleone6797]

Kevin Armstrong any video? Or video of your plane? I’m trying to get a kit together.. so many choices

[@KevinArmstrong4154]

@@mikecorleone6797 used an Ace Aviation trike and Cyclone wing, plus designed them a reduction drive to fit the Briggs motor.

[@QuikRFlyer]

Go Kev! Yeah, you should get the exhaust sorted but try to leave the flames. Nice work buddy. Can't wait to see it on the trike and flying. Are you taking orders yet?

[@KevinArmstrong4154]

If you're putting it into a racing Kart Charlie make sure you fit a rev limiter, that flywheel is deadly if it explodes. You can buy them off Mudbuddy in the USA, alternative is to buy the alloy flywheels they sell at EC racing in the USA, watch the heat though as the fan is smaller, or buy a plain steel flywheel and use the stock fan. The Eagle IV is designed for kart racing in the first place...;-)

[@CharlieTibbles]

hi right ok yea,does the engine like you have with the tuning bits have a rev limiter, is the best idea to get a new engine and tune one or stick with my old one? also is Brian still able to get parts as seen on the forum he had an opp then wasn't getting parts? thanks

[@Athrong6788]

Did you make a gearless ?

[@kevindouglas2060]

When you run a 4 cycle engine without at least a short tube on the exhaust you risk warping the valves because of uneven cooling after shutting down.

[@KevinArmstrong4154]

STAINLESS EXHAUST VALVES, NO ISSUE, THIS WAS A BRIEF TEST RUN...

[@penaestradamg61]

what engine and this and how did you get this propeller coupling

[@KevinArmstrong4154]

Engine is tuned Briggs 38 series (627 cc) tuned using american parts, Reduction coupling is from Ace Aviation, his factory is in India run by a UK man and his Indian lady, aceaviation.co.uk There is a man in Brazil who has fitted several

[@steze48]

I'm sure you know that without exhaust pipes when you decelerate the engine cold air gets sucked in around the hot exhaust valves resulting in a chance of crystallizing or warping the valves...

[@KevinArmstrong4154]

Yep, luckily I'd fitted stainless exhaust valves, and ran the motor for a few minutes only. Bigger issues result from mixture reversion (Google it on Harleys) from too short pipes. Exhaust valves perfect after 160 hours...until the camshaft snapped. High lift, stiff springs and no reinforcement, in future recommend going to Precision cams as they reinforce theirs with steel bar down the middle, and make billet ones too.

[@Triple_J.1]

@@KevinArmstrong4154 I've just started researching these motors for a potential Aero-build. Love your vids! The camshaft has come up as a breaking item on three occasions/videos now. It seems they all snap in the mid-100 hour range. Unacceptable (to me) and thank you for that pointer. I suppose the crank is good. The turbo-mower racing guys used forged rods. But I guess it's not always required I not boosting/over revving, or is it?

[@1950harleycharley]

That is really smart to run it without an exhaust...you can ruin a good engine very quickly like that!

[@KevinArmstrong4154]

even with stainless exhaust valves? 180 hours on those valves now, this was just a test to check the starter was up to the compression raise

[@Triple_J.1]

harleycharley No, you can't. That's a wives tale based on strictly non-scientific assumptions. The hottest exhaust ports are found in turbocharged applications, with full exhausts and lots of back-pressure. That's why turbo exhaust valves are much more severe duty than NA cars.

[@janehelberg9815]

How did you build the reduction drive pulley system. Won't that prop come loose?

[@KevinArmstrong4154]

Flown 120 hours, pranged after engine failure, snapped prop blade, removed redrive, fitted to rebuilt engine, flown 20 hours, sold, bought bigger 800cc 61hp engine, increased bearing sizes a little and pull width in redrive, flown some more, no prop didn't come loose 😉

[@Thumperfour]

Put the prop on it and it will start easier, acts like a flywheel. Once had an F33 Hirth that would not pull through, put the prop on and it was easy.

[@evans6365]

Engine sounds good. What's the current weight and horsepower. Was looking into this more cost effective engine and just tuning it but wanting to put into an ultralight not a micro light...

[@KevinArmstrong4154]

If you email I can add you to a Dropbox file,

[@ashtonb32]

Found your video by accident. Used to do that that same thing 6 years ago. Lots of work but fun. Now we focus on hi torque and only industrial engines. Have had a lot of fun over the years and they keep getting better. Watch out two strokes your wasteful days are coming to an end. Try Kohler and get a stroker crank kits and you are in biz swing a 66 inch prop 270 static no problem. 1.25 gallons per hour. Have fun Fly Safe

[@KevinArmstrong4154]

Try this...Over the Thames Engine in action coming back from France Cheers Kev

[@talusranch990]

It's krohler

[@GHOSTBUSTERSHANE]

thats a good way to worp a valve

[@clark748]

I'm looking for a replacement for the Roxax 503. Any thoughts, besides Hirth?

[@ArnoldsDesign]

That's impressive. Is that based on the 627cc block?

[@KevinArmstrong4154]

Yes, the 38", or to give the engine full title Model 386447 Type 0114-B1 Code 11072511. Also made in Japan, not the USA, at a joint venture plant with Daihatsu/Toyota. The industrial range seems higher quality than the Mower products from B&S. Web page is vanguardengines.com.

[@ArnoldsDesign]

Kevin Armstrong Thanks, Kevin. I remember a time not so many years ago, I mentioned the use of industrial engines on an ultralight forum, and the idea was quickly dismissed as being impossible.

[@KevinArmstrong4154]

Great, I flew the rig from North East England to St Omer in France, 280 miles, each in two hops, with a tailwind each trip took just over four hours, and used around 8 litres per hour, this was before fitting a leaning device ...;-)

[@simflying]

Hello, please, this was originally 21hp small block B&S Vanguard ? What hp/rpm do You expect now ? What parts are You using ? Please, do You have any PSRU drawings ?

[@KevinArmstrong4154]

simflying you can see it all in my Dropbox, the reduction drive drawings and other mods, plus the mistakes and fixes too. send me your email in a private message and will send you the link. about 35hp using 3 blade carbon prop of 1530mm diameter cruise at 58 mph and climb at 650 feet per minute at 45mph

[@muhammadkhairun5871]

Kevin Armstrong sir.. nice engine.. can you share to me what saiz small & big pulley.. and what suitable propeller saiz tu use in 2 blade wood.. tq

[@muhammadkhairun5871]

can email to me [e-mail]

[@simflying]

Kevin, I sent You a message with my e-mail. Did You got it ? I couldn't find Your DropBox :-(

[@muhammadkhairun5871]

simflying sorry your email no receive to me... you can give your email here??? i willl pm your email... tq sir

[@aceventura7064]

So howd it work out its been 5_6 yrs ? Parachuteot trike mtr ?

[@KevinArmstrong4154]

kzbin.info/www/bejne/pJ3OiWN5mMeNa7s and many more... ;-)

[@williamquire2115]

Why would you not put an exhaust pipe on it before starting it

[@KevinArmstrong4154]

Before that the thing wouldn't spin, as the stock starter motor couldn't cope, because of the high compression pistons, and camshaft without a decompression rig. Changed to a John Deere starter and it ran up, so filmed. It had stainless exhaust valves so heat wasn't an issue. Anyway, bolted in an aircraft and flew to France with it across the channel later, so pretty plain that no harm done... ;-)

[@akdiaz1111]

do you think it would be possible to put that engine on my sons mini motorcycle

[@warisnogib7229]

Does the engine cc boss, can it be installed on a mini sport plane or not? sold no I want to buy. how much is it? ... thank you

[@KevinArmstrong4154]

It's a standard 630cc Briggs industrial engine with an Ace Aviation reduction drive I designed for it, works well

[@caseykelso1]

@@KevinArmstrong4154 are the reduction drives for sale somewhere? Thanks

[@KevinArmstrong4154]

@@caseykelso1 Yes, designed the first one for my own use, and the guy making it has now sold hundreds round the world adapted for different engines. Brit running an ultralight factory in India, high standards, low price, we're friends. his email is [e-mail] and website www.aceaviation.co.uk/redrives

[@zanzark1]

It sounds like a beast! I loved it! I'm building a microlight too, and I'm interested in this engine, but stock power is too low. Is there any guide to tuning like you did?

[@280zjammer]

Paul Kersey sound isn’t everything. There was no exhaust installed. Remove the governor and you will have a similar sound. The power will built with a cam upgrade, fuel delivery and spark timing. The internals needs a little help with the valve train. Some people like lighter forged piston and rod assemblies. Lighter flywheels allow faster response which might not be desirable depending on the aircraft. I’ve seen turbochargers installed with fuel injection, on go karts, which would make a lot more power. Just be sure to avoid dangerous operating conditions like too much heat, lean mixture, overspeeding etc.

[@KevinArmstrong4154]

@@280zjammer It also has the carb from the 990cc 61" series Briggs, plus pistons have shallower dish to save skimming the heads for more compression

[@dhillmjex1]

nice engine.

[@KevinArmstrong4154]

Motor was £1267 including taxes, tuning parts and reduction drive, budget another £1500-£2000 depending on state of tune Flew to France and back, 280 miles, so going well

[@capnfox4355]

Why do these small airplane engines have such deeper sounds then normal engines of the size? Do you burn alot more gas at once or something?

[@KevinArmstrong4154]

Because aero engines run at much lower revs than motorcycles, so sound deeper, mine's running at 7 litres per hour at 60 mph, half the burn of a two stroker.

[@capnfox4355]

So It has slower RPM? I thought propellers needed really high speeds.

[@KevinArmstrong4154]

Boreal Games Props like to spin at 2500, engines at 4000+ so it's got a 1:1.8 reduction drive from Ace Aviation, a Brit who runs a factory in India to use the cheap manufacturing there. Work is very good, mine's reliable.

[@jubeetobbe5025]

What happens if the prop runs at 4000 rpm? Is that bad?

[@knightrider1545]

Wow, thats crazy high rpm, I thought it may be like 3800-4300 rpm.

[@jubeetobbe5025]

So what exactly needed to be modified in this engine in order for it to be fit for flying????

[@KevinArmstrong4154]

full story is on BMAA forum in SSDR section, UK, cheers

[@WrenchLife]

Hi Kevin, I spoke to you on the phone maybe a year and a half ago about building one of these engines up, well I have a running engine now but am always looking to improve it, was looking to see if you still had any of the bits left for sale? Thanks man, and good to see the yoke is still going 😉 Jonny

[@KevinArmstrong4154]

WrenchLife in Italy for a week

[@PolarisJD]

How did you mod the air box to fit that filter setup?

[@KevinArmstrong4154]

PolarisJD added a K&N filter adapter from Performance V Twins, came with a free throttle lever adapter

[@Southern_Sportsman]

What carb are you running I want it for my mud motor

[@KevinArmstrong4154]

the one off the 1000cc or 61" version (Big Block). If you use it on the 627 cc 38" engine specify jets for 5000 feet and they are smaller, so it doesn't run too rich

[@eslanek785]

Where can I buy this Belt Reduction Drive?

[@Triple_J.1]

Ace Aviation out of the UK has them listed on their website. Hands down the nicest looking and functioning components of the sort available. IIRC they cost around 700 (British Pounds).

[@leviterande]

Nice end result but isnt that expensive considering all the new mod parts + the original engine itself that you striped away almost all its original parts? Or perhaps you found a Vtwin old used block for cheap price and just bought the mod parts? How did you do it and was it expensive?

[@KevinArmstrong4154]

Cheaper than many two strokes and uses half the fuel. You can get an old one and add the tuning parts but I wanted it to be all perfect

[@leviterande]

Kevin Armstrong True! I am looking for these Vtwins and I only finding them in the US. I am in Euorpe so would love to know where one can find them anywhere in EU, perhaps you know?

[@KevinArmstrong4154]

leviterande they are imported via Holland, loads of pilots using them in France and Belgium too, bought mine in the UK. Flying Fish Hovercraft will sell you one

[@juaritchornobay5232]

Hello friend, I have an equal engine and I need your help please i need to know which propeller vc size ussou and caught the pass, and if possible the size of the pulleys used in this engine. Here in Brazil I am not able to hit the spinning motor with the propeller I thank you from the heart

[@KevinArmstrong4154]

Talk to Kleber Alvez Adorno in Sao Paulo, he used my redrive design and flew it. 100mm crank pulley and 180mm big pulley, best with three blade 1525mm diameter or 60"

[@nguyenbay8902]

I want to buy the briggs stratton upgrade kit

[@raydreamer7566]

I like it . Where did you get the belt drive reduction drive ?

[@jamesmason1182]

VERY COOL DUDE!

[@KevinArmstrong4154]

aceaviation.co.uk, my design for them

[@e30maniak]

i need something like this in my gokart. my engine is only 3000rpm where can i buy this carb?

[@KevinArmstrong4154]

Carb is the model from the bigger 1000cc or 61" series Briggs, you can buy them off the shelf. Go for the one with jetting option above 5000' as then it is leaner mixture which suits the smaller 627cc Briggs, my part number was 845273 but may have changed now. It is too rich in mid range but full throttle is just right. You have to open out the inlet to allow the butterflies to swivel, but otherwise it bolts straight on. Have you uncoupled the governor?

[@KevinArmstrong4154]

The American sites will sell you it, just extra for the postage.

[@e30maniak]

thanks ☺

[@e30maniak]

Kevin Armstrong governor is totally out. ok i will Look for sites and try to buy it . thanks and all the best 4 U

[@gordon6029]

Sweet!

[@dennybodden3272]

do you have the web link for this build

[@andrewmudge15]

Hey check out back water performance for a exhaust or marshmellow exhaust

[@KevinArmstrong4154]

Made one out of Walker 1.25" exhaust tubing, welded together from 90° and 45° bends. Key is to get them as long as the installation will allow

[@patbrooking123]

Looking for info on these motors setup for flying........................????? Can anyone give me a direction to look for using it.........

[@KevinArmstrong4154]

Where you based Julian? In the USA I bought the tuning parts from Performance V-Twins, the engine is used in mud-boats and racing karts, tractor-pulling, Bandelero racers and so on. In the UK my friend Brain Fallows has the distributorship for P-V T's parts.

[@Dallasl_andscaping_.]

how much Horse power Kevin?

[@KevinArmstrong4154]

Around 35hp, a little less than a 447 Rotax

[@wladmdaih23]

Hello This engine liked and I want to buy one. How much is it?

[@1minibean]

Website for the redrive?

[@jimmyherring4349]

I wouldn't crank any motor with out exhaust on it

[@KevinArmstrong4154]

Jimmy Herring short test, stainless steel exhaust valves, ran 120 hours flying and valves perfect, used 36” pipes

[@e30maniak]

little problem....im from POLAND :)

[@jwestgrayhat]

How much does it weigh with reduction?

[@KevinArmstrong4154]

Around 32-35 kilos plus exhaust, allow 40 if you need a silencer, flew it around the UK for a while, now developing a bigger one. A lot of options if you don't need 35hp, with lighter starters or hand prop if you have the stock camshaft with decompresser

[@2stroketerror125]

Running open ports is BAD the air rushing in after you shut it down can crack a valve

[@knightrider1545]

What's the redline?

[@blairwise3339]

which stock power plant did you start from?

[@KevinArmstrong4154]

Briggs & Stratton, built in Japan, 3864470114 code

[@caseykelso1]

@@KevinArmstrong4154 i thought the Vanguard where built in USA?

[@KevinArmstrong4154]

@@caseykelso1 designed in USA but made in a factory in Japan setup by Daihatsu Toyota

[@caseykelso1]

@@KevinArmstrong4154 the link you posted to one of the patronson your channel ,said made in the USA . They have a video on the linked site ,and they show us the casting factor and assembly areas in Georgia??? It is a Vanguard V twin ,I'm confused 😕 lol

[@KevinArmstrong4154]

@@caseykelso1 search for vanguardengines.com

[@vg23air]

i googled it... No, that is an old myth which has been around for YEARS. I have been rebuilding engines & cylinder heads for 50 years. I have NEVER seen it happen or seen PROOF of it! Burned exhaust valves ARE caused by Low Spring seat pressure, Loose valve guides, worn out valve seals. Out of those 3 worn out valve seals is what I see most often. Worn seals let too much oil go down the guide. This oil tends to build up and burn into hard carbon on the valve stem. This causes the valve to stick JUST as it is seating. The valve cannot transfer its heat to the seat and burns.

[@KevinArmstrong4154]

Engine brand new, valves lapped in and guides narrowed where they protrude into the inlet ducts. Nothing went wrong in 120 hours of flying, until the cast iron camshaft broke. When stripped all parts undamaged by the failure where in perfect condition.

[@rubenilcb5002]

quantos rpm ele alcança

[@KevinArmstrong4154]

4500 cruise 4800 maximum

[@hadichannel7689]

Price of that engine plzz

[@KevinArmstrong4154]

long discussion on the bmaa forum under SSDR Heading

[@Shaft-Industries]

Kevin, what is the weight of the engine with exhaust and psru?

[@KevinArmstrong4154]

40 kilos, but much lighter if used in tractor mode without the fan etc.

[@Shaft-Industries]

I was planning on a pusher configuration in a twin boom type ultralight. I like the USA v-twins and am trying to figure out how light the airframe must be to fall into part 103 category. Thanks Kevin.

[@KevinArmstrong4154]

+Paul Kleban hi, just got under 115kilos which is UK limit for FAR103 or SSDR

[@Z0mbeSlayer]

How much does this weigh?

[@KevinArmstrong4154]

Around 40 kilos or 88 pounds with heavy starter and pipes, it ended up adding five kilos or 11 pounds over the original 447 installed because the Rotax needs a huge silencer and expansion box, this doesn't. installed video here Briggs Vanguard Ultralight Engine ground run and in flight here Climb to 6,344'

[@mikewelch3903]

Having no exhaust pipes is a good way to burn valves.

[@KevinArmstrong4154]

Mike Welch 120 hours I stripped it after camshaft broke, the exhaust valves were perfect, but I had fitted stainless steel ones.

[@KevinArmstrong4154]

@BigSwede500 Just a bit too much of it...;-)

[@athertonman]

Nice mag kill :o)

[@tankbeast456]

i want that in a motorcycle

[@KevinArmstrong4154]

Home built

[@caseykelso1]

Stop cooking that belt! Put a header on it

[@KevinArmstrong4154]

You're way behind mate, this was a quick test run, flew it to France, tested three exhaust designs first, watch my other videos

[@caseykelso1]

@@KevinArmstrong4154 behind in the video sequence, ya . But running the engine without a header even for minutes will heat that belt, and cause extra wear on your valves.just concerned. What about altitude with a lawn mower motor? Are they proven for 10000 ft.? What about oil ,synthetic or regular. And can I know the gear ratio , what rpm is good for cruise

[@KevinArmstrong4154]

@@caseykelso1 Belt is miles away from the exhaust ports, bad viewing angle; exhaust valves were changed to stainless to resist heat. Used synthetic lube, redrive self designed and made by Ace Aviation in India by a friend (Brit) who runs a factory there. Ratio 1.8:1, cruise anywhere between 4000 to 4500, below that get pulse vibrations, above 4800 it gets fussy. Ran 5000 foot jet version of 61 series carb, added a leaning device but it ended up just being a nuisance as it could cause hesitation and another thing to close when landing

[@caseykelso1]

@@KevinArmstrong4154 thanks for answering ,can't you have it direct drive and run motor at 3000 ? And I am watching all the videos too. Great content!

[@KevinArmstrong4154]

@@caseykelso1 Direct drive it doesn't make the horsepower, which is torque x rpm. engine rated at 23hp at 3600, with a touch of extra advance and better breathing I saw nearly the same as a 39hp Rotax 447 but exactly half the fuel burn, job done. First time flew from North East UK to Isle of Wight burned over 48 litres, first trip with Briggs burned 23.6 litres.

[@2stroketerror125]

From cooling too fast

[@gillesmartin2432]

Tester de cette façon 1 intoxication et 2 glaçage des cylindres = moteur à la poubelle

[@KevinArmstrong4154]

l s'agissait d'une brève exécution pour confirmer que le moteur de démarrage lourd pouvait faire face à la forte compression et à l'absence de décompresseur sur l'arbre à cames, une fois qu'il a été prouvé que le moteur a été installé et cassé correctement avec l'échappement et l'hélice installés. Il a ensuite traversé le canal jusqu'à St Omer et a couru pendant 120 heures, jusqu'à ce que l'arbre à cames aille brisé. Une nouvelle énine a été construite avec un arbre à cames renforcé d'acier après cela. Ces moteurs sont solides et conçus pour abus industriel

[@Armilite1]

Be nice if you really Documented what your Building and using, Brand Name, Bore & Stroke, CR used, Carb Size, CAM Spec's, etc. so others can gain knowledge from your work. You can use this Calc to figure out the Volumetric Efficiency of the Stock Engines known Hp@3600rpm, then just Increase the rpm to desired Max rpm, but most Stock Cams peter out around 5000-5500rpm. www.mk5cortinaestate.co.uk/calculator3.php

[@deltabluesdavidraye]

burn it up with no pipes

[@KevinArmstrong4154]

David Raye it was a short test to check out the new starter, I'd got stainless exhaust valves against heat. Flew it for 120 hours until the cast iron camshaft broke, now reinforced with steel bar down the centre

[@stephenjray1988]

spent all that money on it and run it with no exhaust good way to waste a bunch of money

[@vg23air]

dantes inferno, so, after seeing this, what distance from some measurable object in your video should the egt probes be placed ?