Hola, I was wondering if anyone would like to take a guess at the average Horse Power rating of the Ryobi 31CC motor? Also, I had read somewhere that the old ryobis had a rev limiter? Is there and rev-limiter on the new ones?

There was a rev limiter on some of them for a while. it started around 7,000 rpm. You have to buy a different coil assembly to get rid of it.

The limiter didn't present much problem if you ran a 18-8 on a stock engine. I'd only go past 7,000 in a dive.

With a 7/16" carb and open exhaust, they can get up around 7400 with a 18-8 Dynathrust.

Enjoy,

Jim

Well, actually I WANT the rev-limiter.I am not using this on an airplane. I am looking at using it as a safegaurd for nitrous. I know these motors arent made very solid and am looking for ways to safely run 5-10 second bursts of nitrous on wide open throttle. The whole motor will be run for no more than 45 seconds at a time before cooldowns. I have been using it now for a while and it twists the motor up to grenade like rpms. lol..I am looking for ways to dial it back a notch.

I would not be anywhere near that engine when you put nitro to it if it is the nitro I think your talking about.

To take full advantage of this, you would need to load your engine to where it was just beginning to hit 7,000 at the end or it would serve no function to use the nitrous?

I don't know the number of those coils. To my knowledge, they were just around on certain models around the turn of the century.

I just know that modelers hated those coils when they showed up.

I think Walbro still makes those but to get one, you'll have to come up with the model number of the Ryobi that had them? You need a resourcefull parts man at a small engine facility?

A Ryobi sure seems like a poor choice for a performance engine? They serve their intended function very well. But, they have a three piece crank that has the counterweight pressed onto the main shaft. Then there is a short length of drill rod pressed into the counter weight for a crankpin. Then there is a stamped steel connecting rod that is actually two pieces rivited together. Just not performance material...

Enjoy,

Jim

Be sure to don your flak vest and helmet before putting the "squeeze" to that ryobi. Hot metal shrapnel won't feel too good under your skin.[:@]

BTW, I have examined the internals of the ryobi 31cc,........ and I'll bet many of them grenade without the help of N2o.

Killiondesign: Get a Homelite 25cc and try the Nitrous.. This engine has been run in race boats at very high RPM. They hold together real good. Good luck Capt,n

There's a lot of performance parts available for the Homelight 25/30.

Enjoy,

Jim