Super Jet Did I expect to much?

[Flyboy]

So I just change the domes in my blowsion head from 37's to 33's. I'm at 3,300 feet and compression before the change was 150 and it only changed to 165. I was expecting 180. Is something wrong or is that what it should have done?

 

[Matt_E]

You should have seen a bigger change

 

[Flyboy]

Is there something I can check? Do I need to ride it around for a bit to let it warm up? I used the same tester.

 

[tor*p*do]

make sure throttle is wide open and follow procedure
how old is the top end?

 

[Flyboy]

Throttle was open. I just bought it recently and the guy said it hasn't been rebuilt. But that's still pretty good compression with the 37's in but not a big change with the 33's.

 

[deftons56]

Where did you get the 33s? Is there a part number stamped on them anywhere?

Sent from my SPH-D710 using Tapatalk 2

 

[Flyboy]

Ordered through fast elements and I think they were just made. Both had 33 2 etched into them