Nitro engine Modifying

[@nitrorcenthusiast5663]

Honestly Thank you so much for all your great videos. Most engine modders would never share anything about the work they do. I've been reading a fair bit lately in an effort to better understand these engines, how they work and how to modify them just for my own interests and enjoyment and you have really helped with this video to increase my understanding. I honestly can't thank you enough for sharing what you have. Much respect and I'll be eagerly awaiting your next video.

[@terryshrives8322]

Excellent! Really helped educate me about these engines. I looked up exactly what is done to modify these engines. Never looked into after 25 years. I stumbled upon this video, and you Sir, truly are a master.

[@cbh148]

RIP Rex, You made this hobby better.

[@Tekjive]

That V taking out alot of good ppl :(

[@torianmitchell4514]

Rex has been my engine guy since 2008! A good friend too!

[@luisrosario1112]

Rest in peace Master!

[@johnspiteri6807]

Great video 👍🇦🇺 thank you for the insight into nitro engines it's a great hobby & there are so many different combinations into making a good engine. 🚗💨

[@MrLilChilly]

Awesome video and great info. 👍👍

[@markkeeley9060]

Awesome video. Love the passion of things can always be a little better. I can't not modify even if it takes throwing money at it.

[@Alan_Hans__]

Great video. I've never touched a nitro RC car in my life but the technology interests me. So far this has been the best video that I have come across which explains where the air is flowing and when. Subbed in the hopes of learning more and maybe 1 day having a play. 🇦🇺

[@Jprc79]

My man, great job 👍🏼👍🏼👊🏻

[@moddedt7414]

Great video 👍

[@skycorrigan6511]

We're missing you, Rex

[@gearheadaddict7183]

Hell yes great info. Im also a machinist/diesel mechanic and welder.. thanks for the information. Btw dont give away all your trade secrets lol

[@adamforman9264]

Thank you very much , please make more....✌

[@craigromero9815]

only need the hole s in back plate on one side

[@davelowets]

7:10.... Around here we call them "Boost ports".... As the piston starts going down, the air pressure that builds up underneath of it as the volume in the crankcase is now shrinking starts to escape through that hole in the piston and helps to "blow" the air/fuel charge up into the regular transfer port above it when the piston uncovers it. It gives the air going into the tranfer port a "boost" to get moving and carry more of it in the the cylinder faster. It also helps to blow morebof the spent exhaust out of the cylinder as quickly as possible. This fact is why you should also run a different pipe made for a boost port engine when you're running one. The boost port gets the air moving into the cylinder more quickly, BUT it also ends up with a bunch more going out the open exhaust port also. You need a pipe with a different timed reflection wave, than one that is made for a 3-port engine with no boost ports, in order for the pipe to create a stronger, earlier, reflected wave to help push more of that fresh air/fuel charge that escaled out into the exhaust pipe back into the cylinder. If you used a pipe such as this on a 3-port engine, the reflected wave that pushes back would be too much, and be pushing exhaust back in the cylinder also. It's ALL about finding that perfect balance for the particular engine combo, including the port timing, flow, compression, rpm range, and so on.

[@thetoddperspective]

11:45 that looks like a mito crank 13:05 I was going to say that looked my ops speedster sleeve Ive always wondered about the crank in the old Orion crf engine, there are slots in the crank opposite the window going thinner to thicker. Do you know what those do? Also, have you ever experimented with Singh grooves?

[@TheRwmods]

Yes a Mito Crank, And the sleeve is from a Ops or the other brand. I did talk about the grooves on an Orion crank on one video. I played with Singh groove a few years ago but havnen't done anything with them lately.

[@RBAERO]

About the button head tou modify you calculate the squish or make empirical?

[@TheRwmods]

I had to look up what empirical meant but yes just based on my experience.

[@arnerrvik7586]

Thanks🙂

[@martinstahle5778]

Hi Good video :-) I hava a exhaust question , can i move the engine powerband with difrent size and length of a hose after the silencer ? Sorry for my bad English . Regards

[@TheRwmods]

Yes making the header shorter or longer does change the powerband. Most older pipes with a silicone connector between them are pretty outdated. You would probably gain quite a bit of performance by getting a better pipe.

[@Goofboyz]

Very calming voice, one question what is readily available to fill the crank.

[@TheRwmods]

It has to be nitro safe, the good stuff I use is over $30.00 for a couple ounce tube!

[@ebow7964]

Hi this was a very interesting video. Im modding the sleeve on my .28 nitros just putting a smooth transition into the boost port and transfers . what silicone do they use in the crankshaft ?

[@fastrc9212]

Hi, I know we should measure the stock timing first and then we know what we have to do and we want to have nice 220 (160-60) timing, but my question is what is the impact/differences between cutting the opening and closing of the crank?...thanks

[@fabianclercin6410]

Hi sir first of all great vid very informative. I am searching the internet to find an answer to a question I have. I am hoping maybe you can help me, Is it possible to use a sleeve, piston and rod from one company in another crankcase. Eg. I have a hpi .21R SC and its parts are discontinued (or maybe I don't know that i am looking for) so i was wondering since novarossi help make that engine i can use their internals to bring the engine back to life.

[@charlespadgett4834]

Is a GIMAR crab any better then a normal old nova crab?

[@HP-HENRYSHORT]

could I put a mac 28 head Barrel sleeve and piston in a 21 ? thanks

[@TheRwmods]

Most .28 have a bigger outer sleeve diameter and the crank has more stroke. I can't say for sure without seeing it but in most case it will not fit.

[@HP-HENRYSHORT]

@@TheRwmods oky thanks you and would a 21 engine Carburettor fit onto a mac 28.

[@TheRwmods]

@@HP-HENRYSHORT Most carbs will switch from .28-.21 and some brand interchange also.

[@HP-HENRYSHORT]

@@TheRwmods okya much help thank you.

[@GODLIKEZ490]

@@HP-HENRYSHORT all of the hobao carbs fit from 21 will fit any upper sized engines

[@R.B_B]

Anyone knows what is the program they mentioned in the video. To calculate timing?

[@treverlund1948]

What side of the crank window do you like to open up? Opening or closing?

[@TheRwmods]

Both, but you really can not do it without knowing where it is stock and knowing how much to take off.

[@Joey-el7ud]

What program do u use?

[@TheRwmods]

I got it from a retired engine modifier, I am not aware of any out there now.

[@satriayuga1989]

Miss you sir

[@mariodelgado9729]

Thanks Mr. Obvious, Jeezuz...

[@colossalbigfoot256]

I’d watched this vid had it not had a dozen ads.

[@romper4444]

RIP my friend

[@pitbikecookracing3324]

👍thank you.

[@boharris8179]

so whats the deal is nova done?

[@Happygrowercbris420]

Is a lrp32 a good motor

[@TheRwmods]

It is ok, not great quality like a race engine. It is made by SH and the same quality as Sh and Dynamite engines.

[@Happygrowercbris420]

@@TheRwmods ok what would be a good engine to put into my losi rtr nitro truggy I want it fast and to do wheelies

[@TheRwmods]

@@Happygrowercbris420 There is not much out there for engines bigger than a .21 that are high quality. A SH, Dynamite .28 are decent and a bit chepaer than the LRP 32. Novarossi made a great .28 but really hard to find right now.

[@LawrenceTimme]

I don't really get why the manufacturer does make the engine perfect from the factory?

[@LawrenceTimme]

@Mescalinum Sunshine true. I guess it would put the cost of manufacturing up to add these extra steps as well which would eat into the profit. Still you would think they would have found these mods in the designing phase of the engine and then put them into the production.

[@chadanderson2486]

Over 30 years I've definitely seen micromotori improve. Some modifications are labor intensive like balancing the crank with tungsten after ramping. Nova Rossi gets close.

[@LawrenceTimme]

@@chadanderson2486 novarossi doesn't even exist any more XD

[@chadanderson2486]

@@LawrenceTimme Strange i can still buy engines and Novarossi has one of the easiest and most informative websites.

[@LawrenceTimme]

@@chadanderson2486 they closed down in April last year. Whatever is left is old stock.

[@mad_mechanic]

Reading between the lines

[@Eduardo_Espinoza]

Rip

[@sendit2873]

yeah do not tell anyone how so they can do it. I am sure you charge alot to grind a few slots

[@TheRwmods]

There is alot more to modifying an engine than grinding slots. Mapping out all the port and crank timing and then optimizing it is way more important than a few cuts on the sleeve.

[@sendit2873]

@@TheRwmods I did not mean to sound like a jerk I am sure there is alot of science involved not just slots I am sorry if that sounded like a jerk

[@agbaker68]

Great video but you get a "thumbs down" for the amount of adds you allowed. At a little over a thousand sub it really seems pointless.

[@TheRwmods]

How many ads was there? I am curious

[@agbaker68]

@@TheRwmods 8 in total

[@TheRwmods]

@@agbaker68 I looked at it and took some out. I wasn't aware it put that many in there.