inside pic's of my modded rb engine
 

Ok here are some pic's of the three port l2g rb engine that i modded and it runs like a raped ape! I know that alot of guys on here mod there own engines so what the h#*! i firguerd i would put mine out to see what everyone thinks.

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sorry about the cat pic opps!

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Hey foot,

Where in NC? I can't even imagine how fast that thing is now you saw my other post. I'm not even broke in good yet and mine is screaming with no mod. I guess its so fast it scared the cat out the window LMAO.

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i live right outside Raliegh NC

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froot what you running it in?

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koysho infreno 7.5 but not much 7.5 stuff left mostly 777 on it

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Not trying to "burst your bobble" here, but from what I see in those pictures I can't believe that engine is still even running. You got kind of crazy on the cutting and probably started even having a negative affect on the engine.

FYI, timing is where the real power comes from. There's little to no power gains from "porting" an engine. Spend about an hour or two in the "nitro car engine" forum reading the post that come up when you search for "modding" and you'll learn a lot.

By the way cutting to much off the crank will cause the crank to vibrate more then before and will cause bearings to fail.

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thanks for the input it does still run and its really fast but i know i will here things that are not good because it is radical and i do thank whoever says anything good or bad its all part of learning.

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I am going to start by saying, that I am not a professional RC engine modifier. That is why I put these pitures on here to see what other modifiers think. However I am a professional ATV/Dirt bike engine modifier. That being said and you have seen the pictures, heres the theory behind what I did. Engine are all basically the same 2 stroke or four stroke, their basically air pumps, the more air/fuel they can take in and exhaust the faster they run. I agree that power gains can be seen from engine timing changes however it stands to reason that by opening up the crank, intake plus exhaust ports will allow more fuel air mixture into the engine and more exhaust to escape. I understand the point of the crank vibrating, but nitro engines do not have a counter balancing system in place. The perfect situation would be if the piston and connecting rod weighed exactly the same as the rotating bell on the crank then the piston and rod would act as a counter balancer for the engine. These are my thoughts curious to hear if anyone agrees. Thanks

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im told to believe that the cranks are balanced ! am i wrong?

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Now i could be wrong but i don't see how they can be on larger 2stroke moters they have what is know as a counter balancer its gear driven and works from the crank so when the cranks heavest part is at the top the balancer is at the bottom the only thing to off set a crank in an rc motor is the weight of the piston so here again i might be wrong so that is why i started this to hear from other modders not to get there secrets but to see if what i did was crazy.So we will see i do no that this engine screams

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Like I said before search this thread http://www.rcuniverse.com/forum/tt.asp?forumid=269 for "modding" and you will learn a lot. Also from what I know you can't balance a single cylinder engine.

You don't want to cut the trailing edge of the counter weigh. I could keep posting but all of this as already been gone over many of times. Its amazing what you can learn by searching. With that being said I'm not going to post here again as I would really be wasting my time.

Cutting to much away can make the engine run worse. Look at the pro modders (the good ones not the want to be's) like Ab mods, and Eb mods they don't cut that much away on their sleeves and both of them have X-dyno's to test their engines to see what their mods did, so I think there is a reason why.

I said "not trying to burst your bubble here"

anyways here's some pictures of my work (they're not really the way I want them. Really need to get some better cutters[&:])

http://image2-9.rcuniverse.com/e1/fo...96/Vp38389.jpg
http://image2-2.rcuniverse.com/e1/fo...96/Rc41772.jpg

That engine does have timing mods done to it. (which after wards I did find out the way I cut the timing on those ports where wrong)

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dont be so hard on him dude! he is here just to ask opinions and tips ! actually i think it would be fun to try out a few things!im thinkin about taking an old 8+ gallon 3 port novarossi i have laying around and cutting some small turbo scoops into the intake ports just to see what i will do! and if its bad not to much harm will be done!

i commend you for just trying somethin new and havin fun with it mrfoot!

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Hmmmm last time I recall most great discoveries are because someone dared to do it differently. Hats off to you for even trying. Futility is doing something the same way over and over expecting a different result. Thank goodness Henry Ford, albert einstein, alexander graham bell never read threads. I wonder who was the first idiot who decided to putty up the inside of his crank. I bet everyone thouught he was a real idiot too. Guess they were all wrong.

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Thanks to you guys and don't get me wrong I am gald jb comp said what he did I want different ideas I hope he will post here again I think he knows allot the reason I cut trailing edge of the counter weigh because if you have ever followed a 18-wheeler down the road when it is raining watch how when the air and water spray come off the top of the trailer box it has a ton of turbulence the air is swirling like crazy so I thought what heck if I cut trailing edge of the counter weigh ramp it down that would cut out allot of the turbulence. here again I say I'm not a pro and would not do anyone else engine if I mess mine up it will be on me to fix it.

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Anyboby else have an opinion

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i say you could make the meanest ugliest crookedest cuts, as long as the motor runs better you've improved it. if it gets better gas mileage, has more power on a smoother powerband and lasts 10 gallons race tuned, you need to go in business with that. sometimes making "mistakes" at something reveals something none of us may have thought about. i don't have a dyno but when i mod a motor i wait until its about a gallon old and i race tune it and see how far it can jump and how fast it goes. then i mod it and race tune it again and see if it improved. i haven't done any timing mods yet, but i see marked improvement on all the motors i've modded. one time on my s3 the first time out its temps jumped up to the 350's, i thought i killed it with the mod but it was just the front bearing had been leaking, a common problem with the motor, the l2g's have better bearings now. on the crank, some mod companies remove or scallop the weighted end to balance the crank cause it is actually out of balance from the factory, not by much. when i scallop the crank shaft i like to go deep into the opening and have the whole scallop round out of the hole and towards the bottom of the weight. i've seen a lot of modders leave the internal edge sharp. modding is definitely fun, just be ready to make a mistake and kill a couple motors once in a while.

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I too do port modding myself, not the crank, yet, and I too have had guys do their best to convince me I'm wasting my time, and those same guys post pictures of their porting and that aparently is ok as long as they are doing it and no one else... You dont need to be a so called engineer or what have you to know sleeve porting works, and others should be able to show their work without such negativity... But I guess it is a public forum open to critisizm....

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Yes it has been fun and i plan on modding other motors of mine with this engine i ran about gallon though it then modded it 4 different times first time ran two tanks then the second mod two more tanks same for the 3rd and 4th now it has a gallon run sense the last mod i would do a little try it do a little more you get the point i don't know how long it will last but i can say one gallon and counting

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Ive modded basically lost cost motors, a force 28, dynamite mach 28, stuff like that and they scream. the thing I've noticed is that instead of a smooth linear powerband, the modded motors tend to be more peaky, the power comes on very strong very fast, other than that, porting is fun... I have an LRP in my truck, but so far havent touched it. that thing has so much power, I dont know if I want any more out of it...

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All this talk about people saying what an increase porting did, makes me want to laugh. Just wait till you do timing mods, then you'll see a bigger difference in power.

Talk to someone like Adam, or supertib and ask them if there is any power gains from modding the outside of the sleeve.

(this is the last I post here)

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I dont need to talk to them, their opinion doesnt means squat to me and probably many others for that matter, but go ahead and laugh, we are too, ha. I've been involved with nitro longer than youve been alive, but I dont go around bashing what people do with their property, as long as they are happy doing it...

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Well again thanks to everyone for there comments.

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Jeez, it's not that big a deal for some to get all in a huff over. I agree with vladconnery about discoveries and disasters being the beginning of some great developments. Perhaps these little engines have been around so long as to have every conceivable modification done, but then perhaps not. There is nothing wrong with giving it a shot, and it takes a decent individual to post an experiment into this community and ask for opinions.

To address the crank mod - if I remember correctly from high school (oy... long time ;)), knife-edging the crank counterweights was an effort to decrease the rotating mass and offset the weight of aluminum rods, and also smooth the friction of the crankshaft's interaction with the engine oil. I might be nuts, but it seems to me that lightening the crank can yield at least a bit of improvement on any IC engine (even though no crankcase oil volume). Feel free to correct me otherwise. It's been a while!

mfroot, nice work, and thanks for sharing.

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Well Spoken..!

I lol'd at the second comment :D.