Is it possible to STROKE?

[REVO-5309]

Hey guys, just wondering if its possible to stroke a rc motor. eg thinner piston sleeve and larger piston?

 

[Lessen]

If you stroke one, you increase displacement obviously. Now my curiousity has me thinking how out of harmony the engine would run considering that the ports are shaped according to a specific displacement. Would it throw the engine out of whack enough to create inconsistant running (or tuning)? I hypothesize that IF stroking required modification to the ports, that the cost of the work would be more effectively put into purchasing a higher quality/power mill.

 

[REVO-5309]

yes. that is true. but if its as simple as slipping in a new sleeve, piston and possibly cooling head then it would be cheap, and a small amount of power increase would make it worth it, especially if you were rebuilding it in the first place.

 

[HPIguy]

In the motorcycle world you can add a stroker crank without changing the porting (even on a 2 stroke). The way this works is by using a spacer at the base of the cylinder to keep the ports lined up in their original position. Strokers usually gain you more TQ than HP. Stroking an engine does not add any displacement, a big bore (boring the cylinder for a bigger piston / sleeve) does. Stroker kits are usually the last stage in the quest for HP on a bike because the cost is much more involved than say a good pipe or big bore kit. Plus, they put more strain on the crank, con rod, con rod bearings, etc. The same basic physics principles and short comings would apply on a 2 stroke RC engine.

 

[HPI-Killer]

Orrrr, you can crap the idea since none are sure out the end result, and look over Exctreme RC Mods here in the vendor section and get your powerplant milled and tuned for a race/bash spec.

 

[Lessen]

Stroking an engine does not add any displacement, a big bore (boring the cylinder for a bigger piston / sleeve) does.

Hmm. From the his explanation it sounded like it would. I wouldn't know otherwise. :shrug:

 

[frickenjoey]

I am pretty sure I have never heard of anyone trying it and it working. It's not a new idea by any means and so far...no documented cases of success. So your challenge...make it work. But ....um good luck because I am not sure it is really possible with nitro glow engines.

 

[HPIguy]

Hmm. From the his explanation it sounded like it would. I wouldn't know otherwise. :shrug:

Yeah, I wasn't trying to argue Lessen. Just trying to help explain the benefits and differences of each, if it were possible.

 

[Snook Man]

It would take some doing to bore a tapered nitro sleeve and then re-chrome the sleeve wall and match a piston to it.

Unless you have the tools/means capable of it, a larger or modified mill would be more cost effective.

 

[Lessen]

Its all good HPI. I was basically unknowlefganle on the subject to begin with.

 

[HPIguy]

Its all good HPI. I was basically unknowlefganle on the subject to begin with.

Cool beans. Unfortunately due to my other money sucking hobby, I'm all too familiar with it.

 

[2revo1maxx]

Stroking does add displacement, but there's nowhere to go. Most rods are so close to the bottom of the case that you'd never be able to gain anything.

The only feasable option is boring, so good luck.

You could just modify a picco 26 to look like a 3.3.

 

[HPIguy]

Stroking does add displacement, but there's nowhere to go. Most rods are so close to the bottom of the case that you'd never be able to gain anything.

The only feasable option is boring, so good luck.

You could just modify a picco 26 to look like a 3.3.

I stand corrected, won't be the first time I was wrong.

 

[Lessen]

Dude, you're killin' me. How am I supposed to learn anything around here!!!!

 

[2revo1maxx]

 

[HPIguy]

Dude, you're killin' me. How am I supposed to learn anything around here!!!!

From 2revo1maxx, like me.