The engine is not causing your problem. It's something else. Did you see this post? (click here) With the engine out of the car, does your 2nd gear spur spin freely? Make sure it's not binding up on the shoe.

20% is on the border. You can run it with two shims or with just one shim. You need to determine what's best in your particular situation, based on plug selection, fuel brand and environmental conditions.

rmdhawaii,

Thanks, I know the pinions are silghtly worn, but I tried again today. I put a dab of red locktite and it seem to do the trick, just hope I can loosen it now.
Maybe another factor was that when testing today, I heard a little noise high pitched, like a whistle. I stopped running, engine was still amazing. Got it home and took it apart, nothing I could see wrong inside. Then I played with the clutch. Bingo, blew the small clutchbearing apart. Now I feel a whole lot better.

Heres another question, at about what intervals are you changing the conrods. I have over a gal in it now.

Thanks
Charlie

rmdhawaii,

Thanks!

Charlie: Not sure about the conrod. I've put about 3/4 gallon through the engine so far. I may just wait until it goes to find out.

reecek:

..

Is anybody knows what kind of updated piston and liner was using Cyrul at the world's??

Is it always a Nikasil liner or a new ABC piston/liner kit ??

Well as for the piston/liner, the conrod will generally not have to be changed for a long long time^^. The only part that needs to be replaced for sure is the rear bearing every 10 hours. The rest will depend on how you use and maintain your motor.

You state you took apart your motor, I hope you took great care while putting it together again. It's crucial that the head is tightened evenly on the case.

Nano

For sure it wasn't ABC that was used, we have developped a working system using Nikasil plating for our liner and we know why^^

As for different timings on the ports, I will have to check out with the crew when they come back from Australia.

You're kidding me, right? First time I've heard of this. When did this info come to light?

They were definately running different port timing in Australia.

Well if you didn't know, now you do^^. It's kind of difficult to say exactly how long parts will last because there are too many factors that will affect the lifespan of the parts. So depending on how and with what fuel you run your engine your mileage will vary. But this is what has been done by the CRF team till now, they also change the conrod at the same time just for safety.

Remember the piston does not touch the cylinder so you will not get the usual piston/liner wear you get with other engines. Obviously over time engine parts will wear out but it should take a long time.

I spoke to Didier (one of the two guys from Team Orion/CRF at the track) this morning and they did test/use new ports configuration. We are going to get all the info together and see what evolutions we will bring to the engine if needed.

Anyhow, it seems that a lot of people were impressed with Josh's engine performance. Remember that Josh basically was running an EFRA legal engine, versus the competition that were running IFMAR legal engines which are less restricted.

Are you saying there are 2 version of this motor??? One EFRA and one IFMAR??? IFMAR less restrictive... Your motor from the crank to the sleeve had more things going on then any other motor that ran at the worlds... I believe that was one reason for the protest... I'm happy to see Josh Cyrul do well with the motor... I really want to know what crank mod did Team Orion do to the CRF... and you say it's was still with EFRA limits... Hey, inquiring minds want to know.

RC_Alan

i'm pretty sure they were protesting the expansion hole and slits at the bottom of the liner under the ruling of max 4 ports including exhaust port. obviously the protest must of been upheld since josh ran the motor... and what a rocket!

it almost looked like it kicked into 3rd gear 3/4 of the way down the back straight... although it did flame out a few times in the final, which is a little worrying.