Any tech. guys in here?

This site may earn a commission from merchant affiliate
links, including eBay, Amazon, and others.
C

C.W.Hutzell

Member
Messages
16
Reaction score
0
First id like to say hello to everyone this forum is really cool.Ive got a freind that has one of these trucks(i think these are the same)Its a 30cc enigne?Anyhow i build alot of dirtbike and ATV 2 and 4 cycle engines,he wants me to port his cylinder,i told him to bring it in and lemme take a look at it(ive messed with an RC car motor)from what i know they are weedwacker motors,i want to know if anyone has any info on port timing on a stock motor,do they have just 2 transfer ports and a boost port or just 1 boost port?Anything else you guys could tell me would be helpful,I think it will be fun playing with these little things i might be intrested in doing this as a service.

Thanks for your help in advance!
 
also if anyone knows anything about the ignition systems on these things,i wouldnt think they would have any kind of timing curve built in,any info woudl be a great help
 
Welcome to the forum for starters.As for the above mentioned all the info you need in porting and ignition systems will be in the engine thread and electrical thread ,there will be ,no doubt a few replies to this thread.They are all good people here and if they know an answer will tell you,you wont be over looked.
Good luck
J.
 
There is quite a bit of talk about it but most of us send it in to be done. Slaw is about the only one man enough to try it. The rest of us have feathers and cluck.

You could also try searching a bit. Here is a thread from a while ago:
https://www.largescaleforums.com/showthread.php?t=4001&highlight=porting

Most of what you find on the net is boat guys. Head are a bit different and water cooled.

Good luck and welcome.
 
ive found a bunch of info so far,this forum is nice theres almost everything you want to know on here.One thing i haven't found yet were connecting rod dimensions,are there different lengths i can use on these?
 
i know therew are different cranks,but what about rod lengths?Whats the standard rod legth for all these strokers?Are there different length connecting rods you can use?
 
C.W.Hutzell said:
i know therew are different cranks,but what about rod lengths?Whats the standard rod legth for all these strokers?Are there different length connecting rods you can use?
Click to expand...

28mm is stock on rc engines

there is a 29mm and a 30mm

28mm will rev high

a 29mm and a 30mm will give you less revs but more torque to gear it up

it depends on what you want to do, a hi reving motor or a torque monster.

rasing the compression will give more power and change the timming of the motor

starting with a good motor like a zen 26cc will out perform a clone 30cc
 
im talking about the connecting rod that goes on the crank not the stroke of the crank,the different length rods will change your port time area.By changing the connecting rod length you can manipuliate rod angles,piston speed and port time areas.Theres probibly just one size taht you can use but alot of bikes and atvs a do you can change the length of the connecting rod
 
all the cranks are the same on these rc engines its only the conecting rod thats changes in length, you can not buy new conecting rods, you have to buy complete crank.

you have

28mm

29mm

30mm

this will change your port timing.
 
i thought on one that ddm or one of those sites they had where you could buy just the rod,i need to know the connecting rod length so i can try some numbers out in my computer software.What ill probibly do is use a stroker crank the just machine a step in the cylinder head to set my squish clearance,depending on what im working with i still yet have to see one,lol.You guys are a big help,thanks!
 
unfortunal with rc engine you cant change or replace the conecting rods simply

your looking at it the wrong way, you change the hight of the trasfer ports to change the timming in rc engines.

you can raise them, and lower compresion blah blah and so on this will change timming

you can also increase compresion this will also change the timming

you can machine then heads to lower the head down on the piston to change timming, you can also flat top the piston or machine the rear of the piston to change exhaust timming, along with rasing the compresion and changing the hight of the transfers/ports

most porters will tell you you don't change the rod leght to change the timming you change the ports, by porting, and adjusting the hight of the transfers/ports

these are piston ported engines the piston controlls the timming it controls when the ports close and opean, your on the right track but need to think of other ways to change the timming, as changing contecting rods is some thing we cant do in rc.
 
Back
Top