TWO STROKE INTAKE TYPES | Reed Valve, Rotary Valve, Piston Ported

[@2STROKESTUFFING]

Haha, the Patreon list thing turned out kinda wonky.

[@TheForcedinductn]

I thought it was cool, nice video by the way :)

[@2STROKESTUFFING]

+FORCED-INDUCTN Thanks!

[@jamesdond1]

A few comments on the advantage of a Rotary Valve. 1. There is no lag time as there is with reed valves and no blow back when the pressure comes against them and tries to close them. 2. There is no vacuum created under the piston like in the PP systems and the air flow can be longer. 3. The Rotary Valve does however place a small load on the engine but timing can be more accurate improving the intake flow..

[@AgamSeptian-fq9wr]

Rotary valve better than reed valve?

[@BigEightiesNewWave]

My friend's 70s Kawasaki was a rotary valve , My 1988 CR 500 was a reed valve , Boysen reeds were the hot tip.

[@vannakkeo7453]

Thanks, I thought all 2 Strokes used reed valves , but now I know

[@spasstamatov5513]

Hey man, can you explain in a further video which intake is the best? Or the advantages and disadvantages of every of the intake types. Will be a interesting for many people I guess!

[@Drivehead103]

Seems like Kawasaki KX125 1975 had a rotary valve. I rode one and it would come on the pipe immediately without revving or having to Fan the clutch. Unfortunately it had the suspension of a go-kart and handled like one! Could not enjoy The Ripping engine, it felt like there was no suspension on either end. Rough ground would make the handlebar slap the tank! It was not my motorcycle and I had a decent time writing it that day but it was very disappointing to not be able to use that 2-stroke rotary valve to its potential. I would later on a 1976 Honda CR125 Elsinore and it would rip like nothing else but you better be prepared to scream that engine and shift gears quickly! Luckily it had one of the slickest shifting Transmissions I have ever experienced, barely nudge it and it had the gear. Hardly ever missed a gear and would corner like a roller coaster on Rails. Making me go back in time and remember team Honda Rider Marty Smith. Back when two strokes ruled and made riding dirt bikes affordable. Two Strokes still dominate in my book. But I have to admit four strokes have came a long way, at a very high cost.

[@timmountbatten5836]

Building stuff myself,I like this guy and am learning alot of cool stuff....thanks

[@capchassuck]

The bicycle mount engine kit is piston ported! they are a hot cheap item on ebay. I have two, first thing is to get strong mount bolts because they are the first thing to break, every thing else just needed to be tight. A reed valve kit is optional and the piston would need a port hole. But im happy with the dual spark plug racing high compression head.

[@2STROKESTUFFING]

+Daniel DeNapoli Thanks for the heads-up on the bolts! Dual sparkplug head you say?

[@capchassuck]

All can be found on ebay including copper head gasket pull start option and chopper mount plate, banana exhaust chamber ..its an aluminium Chinese engine ,advertised as an 80cc engine but its really a 66cc engine and piston ported its not EPA or Carb approved. I have one mounted on a homemade scooter with the chopper engine mount. .

[@capchassuck]

The dule sparkplug head is optional hard to find on ebay for about 50 bucks thinking of getting it to be like the old 1970s enduro dirt bike that had it. you can have duo ignition or switch plugs if one becomes fowled

[@krisn8820]

Polaris /fuji heavy industry 2 stroke atv engines in 250 and 300cc's are piston port engines. Still have plenty of power, and super reliable!

[@kaulincurtis9665]

Snowbile fuji engines as well. Great engines. My favorite is the 83-87 600cc triple

[@RobertRobert-d2r]

Thank you. You might have mentioned a little about exhaust ports.

[@Henrik.Yngvesson]

Piston port intake are most common on chainsaws and such hand tools due to it's simplicity. Radne's go-kart engines are one of few larger engines that have piston port intakes, 14hp in their 120cc isn't very impressive but they run forever and are very reliable.

[@kaulincurtis9665]

Many older snowmobile engines are piston port as well. Polaris triples, for example. Some as large as 800 cc, routinely making well over 100 hp with triple pipes.

[@Bull3tBikes]

Hey that’s not bad a 200cc 4 stroke only makes 6.5 horsepower

[@markrancourt5430]

Maico

[@Henrik.Yngvesson]

I forgot to say engines made today. Radne is probably the only +100cc engine made today that's piston ported.

[@derknobit2616]

The bicycle is a piston port style but is commonly converted to a reed style by cutting a window in the side of the piston

[@2STROKESTUFFING]

Should try that mod and compare the two on the dyno! Really looking forward to this motorized bike project! Can't wait for the kit to arrive! Huge thanks again!

[@derknobit2616]

The more high end way is at the base of the jug straight into the crank case. And your welcome.

[@derknobit2616]

And almost forgot the intake gasket is horribly mismatched (normally) would be a good chance to show the effects

[@chernorizetzhrabar1313]

@@2STROKESTUFFING what is the dyno comparison b/w PP and Reed valve on a bicycle engine?

[@MrPuusilima]

I have thinked about that, could a rotary valve actually act same time like a littlekind of charger?? If the valve would be done correctly notched, it could compress air fuel mix in. And also it could act as a flywheel too, partly offcourse, but it would act like a timed supercharger, shoveling air into motor. Desing could be just like plate working, or something like hamsters running wheel type.. or combined..somehow to get little bit pressure first, and when the valve opens BOOM! Mixture shoots in..

[@tylerbandle1821]

1:37 That engine is starting to look like a bong.

[@2STROKESTUFFING]

+Tyler Bandle haha!

[@melaniemeyers6084]

Thank you for the help!

[@cristixd27]

Basically these are whats called a powervalve?

[@keenan3201]

How is the rotary valve turned to open and closed

[@chargerfish1]

It spins. It's driven off the crankshaft.

[@christopherknee5756]

So which valve type is the most efficient or which can give the most power? How critical is the crankcase volume? Does a piston ported engine have more low speed power? How come the engine designers at Stihl, Husqvarna, NovaRossi, Yamaha, etc never watch KZbin videos and comment here?

[@rcpmac]

I believe rotary valves yield the most power

[@cskalle1213]

Is youre crankcase polised and is it worth it? :-) im rebuilding a yamaha bws and tuning it for some power :-) and yes 2T it is

[@2STROKESTUFFING]

+Kasper møller Not polished(though it is kinds shiny), not worth it. Might even be worse than a rough surface.

[@cskalle1213]

2STROKE STUFFING thanks!!! its good to know. cuz ive just put the crankcase together yesterday :-)

[@akshayviruss]

At the end I heard, "please stop crying and thanks for watching" 😂😂

[@MrMawnster]

Please subscribe he said.....but hahahaha that's funny

[@marioraja4229]

if you have pp engine and you want to make some power do you recommend putting a valve into it?

[@2STROKESTUFFING]

+Mario Raja For peak power, No. For everything else, yes.

[@marioraja4229]

what is peak power? (i am pretty bad in english... sorry)

[@2STROKESTUFFING]

+Mario Raja Piston port is fine for peak power

[@marioraja4229]

thank you

[@sowbalansowbalan3270]

M48 clutch weighted spring alterations to high speed

[@kennyc6286]

Question, can a rotary valve 2 stroke kawasaki engine be ported if so how? If not why? I cant find anything online about it

[@rennierrodil6119]

I have one, and yes it can be ported. You can also adjust the design of the rotary disc to adjust it's port timing. ( I don't know it my English terms were right, but thats what we do here in the Philippines.) We have many rotary valved motorcycle models here. For example, the Kawasaki HD3, (exact same engine as bushwacker 175, but with smaller 125cc block. We also have Kawasaki Brutus 140 which have the exact same engine as bushwacker 175 but with smaller bore of 58mm. And some Suzuki gp 125s

[@raccoon681]

@@rennierrodil6119 how long do the valves last is it something to worry about or do they out live the piston ?

[@rennierrodil6119]

@@raccoon681 It ast longer than the piston. Though sometimes it deforms and somewhat affects the efficiency and performance of the engine.

[@prawny12009]

you can fit reeds onto a piston ported engine to aid efficiency no?

[@jasonsnagel]

I did that by accident and it does not work, I couldn’t tell you why tho I didn’t really understand, it has to be a window piston for a reed to work

[@davidsugitanoto4708]

Can i use big karburator in rotary vvallve??

[@2STROKESTUFFING]

Yep, a rotary valve can benefit from a larger carb vs with reeds.

[@davidsugitanoto4708]

2STROKE STUFFING how to modofy rotary valve???b cos i will modofy my kawasaki ke 125

[@lakestatebullies7391]

Make a tesla valve intake. Better atomization

[@tinymotogarage]

That's an interesting idea!

[@crackedemerald4930]

Isn't the reeds valve basically a Archimedes damm?

[@2STROKESTUFFING]

+Pedro Rocha "Archimedes Screw"? Well, not really, but that would make for an interesting intake!

[@crackedemerald4930]

2STROKE STUFFING i think it's the guy who made the Mona lisa that made it... Da Vinci, that one. Also, it would be an very interesting intake... But how the helium would it work tho?

[@rotazracing4635]

This could be interesting if one had time to try and incorporate this type of intake design. en.wikipedia.org/wiki/Tesla_valve No moving parts

[@2STROKESTUFFING]

+Pedro Rocha Spin it fast enough and it would sort of become a supercharger.

[@2STROKESTUFFING]

+Rotaz Racing Yep, very interesting! I've seen a prototype, can't remember where, and if it was successful.

[@bren42069]

Someone should try a tesla valve. That would make 4

[@traceanthony3588]

7th