Other 250 PSI compression???

[Brian_216]

So I ordered 31cc domes hoping to get my compression up to like 215 psi and run AV gas. I talked with Blue who ported the motor and he said with the porting on that motor and the 31cc domes I will have close to 250 psi. I can get Sunoco 110 at 8.00/gallon pretty easily. (I pass the place on the way to work) Is this going to be bad for the motor in the long run? Should I order a set of 33cc domes and just not even chance it?

I dont make any WOT runs, the ski is way too un predictable to ride at speed. Just brap off of waves. I just dont want to trash the motor.

 

[Waternut]

Higher compression is always going to be harder on a motor. Whether 110 is good enough will depend on a lot more than just cranking compression. The guys who really know this stuff are going to want to know things like porting, timing, squish, compression ratio, and probably some other stuff.

If it were me, I would probably run the 33's and use half 110 and half 93 and see how it does. My speedwerx engine couldn't run straight av gas at 215psi. It ripped like crazy for about 5 minutes and then started acting like there was a carb problem. I changed the domes and the problem went away.

 

[Brian_216]

Maybe I can run straight methanol?? ok Im joking about that.


Guess Ill have a set of domes for sale.

 

[Polish jet pilot]

250 is way too much for just jumping wakes..go with the 33cc, it will be better for the motor in the longer term...