how hp from changing domes

[jaymac2448]

whats the hp gain from going from one dome size to the next? i have a stock stroke and stock cylinder motor with a dune port and cpi out of frame pipes with 34 mikunis and an adjustable timing plate set at four degrees!!!! running at sea level to 300 ft!!! just curious!!! lol

[So Cal Suspension]

whats the hp gain from going from one dome size to the next? i have a stock stroke and stock cylinder motor with a dune port and cpi out of frame pipes with 34 mikunis and an adjustable timing plate set at four degrees!!!! running at sea level to 300 ft!!! just curious!!! lol

Holy cow!!!! you sure are excited!!!! We're sure are glad to have you here!!!! WOO HOO!!!!

 

Anyways, changing domes will increase power by increasing compression, thus burning the fuel faster and more efficiently. The smaller the number on the dome, the higher the compression. If you go too high with the compression, you will need to run race gas to benefit from that high of compression. NOT running race gas in a high compression situation will result in detonation, then kaboom, you'll be building a new motor.

[jaymac2448]

Holy cow!!!! you sure are excited!!!! We're sure are glad to have you here!!!! WOO HOO!!!!

 

Anyways, changing domes will increase power by increasing compression, thus burning the fuel faster and more efficiently. The smaller the number on the dome, the higher the compression. If you go too high with the compression, you will need to run race gas to benefit from that high of compression. NOT running race gas in a high compression situation will result in detonation, then kaboom, you'll be building a new motor.

 

i understand about more compression equals more kaboom and havin to run race gas and all that!!! was just wondering how much of a hp gain do you get from changing from one dome size to the next?

[Fullthrottle02]

I was just about to post a similar thread jaymac. I wanted to know myself if the benefits offset the fuel cost. Running 21cc on pump, thinking about putting my 18cc's in on 110.

[EvilBanshee]

I was just about to post a similar thread jaymac. I wanted to know myself if the benefits offset the fuel cost. Running 21cc on pump, thinking about putting my 18cc's in on 110.

 

Curious to your Psi running 21's??? Im running 21's, and my compression is waaaayy high. 14:1!! and i run 103 octaine.... I would have thought it would be like alot lower.

[So Cal Suspension]

i understand about more compression equals more kaboom and havin to run race gas and all that!!! was just wondering how much of a hp gain do you get from changing from one dome size to the next?

I don't know that anyone will be able to give you hard numbers on exact HP gains... I know I sure can't... hopefully one of the builders might chime in here.

[shanYE west]

Curious to your Psi running 21's??? Im running 21's, and my compression is waaaayy high. 14:1!! and i run 103 octaine.... I would have thought it would be like alot lower.

 

 

21's should be around 140ish. If your compression is high.. you might want to look at your squish. 21 and 22 is considered the safe zone for 93 gas.

[Fullthrottle02]

Curious to your Psi running 21's??? Im running 21's, and my compression is waaaayy high. 14:1!! and i run 103 octaine.... I would have thought it would be like alot lower.

 

 

With the 21's in I'm at 148, was 155 fresh. That at 1000ft asl.

[jaymac2448]

With the 21's in I'm at 148, was 155 fresh. That at 1000ft asl.

 

right now i am at 145 and 147 psi at 0 to 300 asl. we goin to the dunes today!!!!! gonna rip it up!!!

[EvilBanshee]

Adding more compression is going to affect torque more then it will horsepower. But either way its going to help you accelerate faster!!