HJR dune port 19cc dome compression?

[hotrodbanshee]

What should the compression be on a stock stroke 350 with a hjr dune/play port, weisco prolite piston, and noss head with 19cc domes at 100ft above sea level? I am at 150-152 psi in each clyinder.

[Starwriter]

That's a little low. See the chart near the bottom of the Noss page.

 

http://www.nossmachine.com/banshee_heads.htm

[hotrodbanshee]

That's what I thought porting lowers compression some. If I was to drop in some 18cc domes what would it bring my compression up to?

[sheerider11]

 

That's what I thought porting lowers compression some. If I was to drop in some 18cc domes what would it bring my compression up to?

relax guy. Your looking at race fuel at that point. Is that a commitment your willing to make ?

[hotrodbanshee]

I am running 100ll avgas. What's the most compression I can get away with? I am running 7degree timing advance.

[10milmike]

Kevin is a good builder,call him and ask him. I am sure he will help u out. Did he build your motor or just port it?

[hotrodbanshee]

Just ported it

[possum]

Kevin dosent know anything about domes/compression/fuel. To OP leave the 19s and run it.

[Pastrykiller]

Possum, Please elaborate on that statement. I'm sure Kevin has his dome specs that he sends out to have cut. They might not be exactly the same as what another builder would use but that doesn't mean he knows nothing about domes and compression.

[Oregon dunner]

I may be wrong or heard wrong. That you should have domes cut buy the builder that ported your cylinders. I'd this true?

[Jereme6655]

I have a dune/play port by FAST and 20cc domes and im kicking 156 on each side at 1000'.....when fresh rebuilt. 

 

So i would call kevin and ask him his thoughts and opinions......BUT FIRST......id find a different guage and check the accuracy of the reading.......also paying close attention to the adapter on the end of the tester as if it has the collar that extends about an inch to get the correct thread size.....its going to show a false compression level.

[special06shee]

X20! Compression gauges vary as much as the weather! My one gauge i bought brand new was 25-30psi off! I e had great luck with craftsman gauges!

[Finch]

Possum, Please elaborate on that statement. I'm sure Kevin has his dome specs that he sends out to have cut. They might not be exactly the same as what another builder would use but that doesn't mean he knows nothing about domes and compression.

um ive heard other wise but i could be wrong did he have some cut for your 421?

[Pastrykiller]

Kevin never cut domes for me. I had a second hand set from m&m then I had wildcard cut me some for the race fuel.

[10milmike]

Kevin sends his domes out to Dave at Noss. Possum, U are so two Faced. To Kevins Face u are all  nice, then talk shit behind his back. Forget u are a super Builder. U call him and ask him a million questions, I have been there when u have. I stay out of the drama all the time, But for u to say he does not shit about domes is funny. He sent a set for free on his dime to make u happy...