ORIGINAL: kazuaki

Thanks for the info. So, sticking with your logic, Earth Surfer, wouldn't the GP290 be a good choice? Being that is has the stock stroke and the 36mm bore?

ORIGINAL: Earth Surfer
IMO--yes. The compression is high on the 35 and 36mm bore cylinders because the bore got bigger, but the combustion chamber didn't get bigger. So lowering the compression (using head mods) should give more RPM with a noticeable loss in holeshot potential---but it should still have more holeshot potential than a G226 because of it's 2mm bigger piston.

ORIGINAL: Earth Surfer

Sorry BuggZy99--but all engines have the potential to out rev a CY29cc engine. 2mm stroker cranks tend not to rev as high as stock stroke cranks, but they make good low end and mid range power. I tested them on peds, with me on it, so I am pretty sure they will rev higher on a lighter RC car--but so will all the other engines. My guess is you will have a hard time getting over 17,000 RPM out of that engine (and the head kit version has less RPM and power) on a RC car. I got about 16,000 on a ped, with a decient high RPM pipe and gearing on the low side, and I have seen almost stock G260's hit almost 18,000 using the same pipe on a ped with a 200lb person (me--lol) abord on flat ground.

Thread starter, you don't have to buy a new engine to get more power and RPM. The number one thing that is holding the 23cc engine back is the stock exhaust. Throw a good pipe on it (ask around for pipe choice), and you should gain about 75% more power (going from about 2.1 with the stock can and stinger to over 3.5 with a good pipe on your stock 23cc engine). Those are pretty accurate average numbers no matter what anybody says.

http://www.davesmotors.com/store/rcexhausts.html

There are also a lot of top end kits that bolt right up to your cases. Some big bores "36mm bore" may require a simple mod in the cases--just a bit of cutting when it is apart on some cases that have not had a little casting nub milled off.

Here is a page with quite a few air coled two bolt options. To avoid abnormal piston wear, you should use the Zen cylinders, or the 36mm GP290 cylinders (the only 36mm bore cylinder--and is made by Go-Ped at the CY factory). The 35mm bore cylinders (the CY 27 and CY 29 cylinders) could use a copper cylinder base gasket to help stop the abnormal piston intake skirt wear if you want to use those cylinders.

IMO, you should buy a good pipe first. The stock exhaust can will greatly hinder the performance you are looking for with any engine you choose. The engines actually make more power with no exhaust at all than using any of the stock cans that any RC engine gives us. The Stock G260 loses .5hp with the the stock Zenoah can on it, and the baja can is probably worse.

http://www.davesmotors.com/store/headkits.html

FYI---stock stroke cranks on a G260 tend to rev higher than stroker cranks, but the stroker cranks tend to get off the line and out of tight corners faster and are also great for 4wd trucks. Your choice depends on what kind of driving you intend to do (wide open sand dunes, or tighter track type stuff).

the most powwerfull and usually higher reving engines will most likely be reed valve set ups (if ported and piped correctly), and my prediction is we will see more optioins for reed engines in the future that will rev up to 20,000 RPM if a pipe for that RPM is available.

ORIGINAL: BuggZy99

i didnt say the cy 29cc engine was the best thing out there, i said i have one and like and its a good bang for the buck, its in his price range he was stating. Good torque and good topend.

ORIGINAL: speedracer1129

Hey Earth Surfer,

Judging by your posts, it seems that you have a good idea in reference to what motor mods to use for certain applications. What setups do you think would get the most RPM out of a Zenoah or CY??

ORIGINAL: speedracer1129

What about a Cy setup??