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Lets see the cam specs. Throwing all the boost in the world aint gonna help if the cam is lame and cant put it to use with the new AFR heads. And for Christs sake, put some fuel in the dam thing! Most people assume adding fuel will kill power, but on a boosted engine, especially marine, you'll find the addition fuel will actually make more power.
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Imco performance manifold with risers.
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I agree with mild thunder. Your throwing a lot of money at it with no gain. Something must be off. A 509 with 9 psi and afr heads seems like it would be making a good bit of power. I know it's a different boat, but I have a 509 with mild ported stock heads, 741 cam running 6.5 psi with a super chiller spinning a 32p bravo 1 to 5800.
What intake are you running? Maybe I missed that part. |
Adding to the lean you have way too much timing as well. I think you need to do a thorough compression test on all holes and go from there. Also we would need more info like cam specs and compression.
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Originally Posted by MILD THUNDER
(Post 3977617)
Don't want to sound like a DIK, but heres my thoughts.
First off all, your tuning to a target AFR that is for sure gonna melt $hit. 13's and 12.6 is no where near where you want to be. Try low 11's before moving further. Your swapping parts and milling heads, changing props and pulleys, and all kinds of stuff. If you torched the head gaskets, theres a good chance you did some other damage, like hurt a ring land or two. With your new cranking compression of 145psi, I think you better hold off on the small pulley before you destroy those new AFR heads. Why don't we slow down, and get back to the basics. Your spending a lot of money to go slower, and breaking a lot of $hit in the process. Glad you ditched the procomp heads too. http://www.offshoreonly.com/forums/g...ed-motors.html |
Originally Posted by blue thunder
(Post 3977631)
Adding to the lean you have way too much timing as well. I think you need to do a thorough compression test on all holes and go from there. Also we would need more info like cam specs and compression.
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Originally Posted by 2BAD4U
(Post 3977636)
First of I don't think you're being a Dick. Second I'm open minded and here seeking help. I'm very Well rounded around race engines as I build my 8 second camaro that makes just shy of 1,250hp to the tire. I'm running meth injection on the boat and therefor 12.6 is still safe. Especially at 6,000ft elevation as the "quality" of air isn't as great as sea level. Plus I want you to read a link here.
http://www.offshoreonly.com/forums/g...ed-motors.html No need to post links for me to read. I've been running blowers on my stuff for a long time, never hurt a piston, valve, or head gasket. I've played with pro chargers a bit too. I helped my buddy with his M4 inter cooled 522 that made 1162hp on pump gas, no meth, with edelbrock alum heads. |
Originally Posted by MILD THUNDER
(Post 3977644)
You never mentioned your running methanol. Then that changes things . Tryin to run 12.6 afr on 92 octane under boost in a boat scared the crap out of me.
No need to post links for me to read. I've been running blowers on my stuff for a long time, never hurt a piston, valve, or head gasket. I've played with pro chargers a bit too. I helped my buddy with his M4 inter cooled 522 that made 1162hp on pump gas, no meth, with edelbrock alum heads. |
I'd get the cam specs for sure.
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Did you determine and eliminate why you blew the head gasket?
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