Pistons hit heads on 454 w 25.5cc dome - Page 2 - Hot Rod Forum : Hotrodders Bulletin Board
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  #16 (permalink)  
Old 08-24-2011, 03:56 PM
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OK pistons clear heads after trimming piston dome edges now with cam degreed in the intake valve has only .050 and the exhaust has 108 the intake valves are to short to set up and he says I may not have enough compresion for the cam what to do now ? he wants to think about it overnight and get back to me what do you guys think

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  #17 (permalink)  
Old 08-24-2011, 05:45 PM
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I doubt you took off much volume off the dome. maybe 2cc? (just a guess).

A 2cc decrease in piston volume will not effect cr that much in a 454.

10:1 would only drop to 9.85:1.
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  #18 (permalink)  
Old 08-24-2011, 06:04 PM
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Mill the heads to get the combustion chamber volume you need.
You will have to cut the valve reliefs in the pistons.
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  #19 (permalink)  
Old 08-24-2011, 07:37 PM
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The reason he is concerned about compression is I am at 10.59 right now with out valve releaf cutting. He says I need to be at at least 10.8 and wants 12 with that big of a cam he was hinting at a piston change. He did not like my KB pistons. He was Also concerned with the pro comp heads but after he looked them over he says there OK Just swap all the springs and all the intake valves.

Questions what about retard valve timing ? will It kill power?

did Lunati sell me to much cam?would I be better off with less?

should I Just step up and buy another set of pistons?

how much compression can I run W/pump gas?
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Old 08-25-2011, 06:13 AM
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would had been easier to get high compression with a 496 stroker kit.

115cc heads kill compression in a 454.

what are the cam specs?

what are you trying to do with the engine?

gear , trans, stall, weight???
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  #21 (permalink)  
Old 08-25-2011, 07:54 AM
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Quote:
Originally Posted by 454C10
would had been easier to get high compression with a 496 stroker kit.

115cc heads kill compression in a 454.

what are the cam specs?

what are you trying to do with the engine?

gear , trans, stall, weight???
Cam is solid roller Lunati 50226LUN .722 lift 345 dur

I am going to drag race it I have a ford 9" 4.11 gear th 350 w/trans brake and a 4500 to 5500 stall Car is a 68 nova ss I have gutted the interior inner fender wells installed sub frame connectors and fiberglass bumpers I need to be faster than my buddys car cause he talks so much smack I am hoping for a 9.99 car have 10.5" slicks also
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Old 08-25-2011, 08:22 AM
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Wow! what a total mis match of parts..
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  #23 (permalink)  
Old 08-25-2011, 08:53 AM
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Quote:
Originally Posted by BOBCRMAN@aol.com
Wow! what a total mis match of parts..
Thats what the engine builder said I was ready to cry I have been misled through out this build and its starting to hurt $$$$
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  #24 (permalink)  
Old 08-25-2011, 11:10 AM
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Fat wallets are nice.
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Old 08-25-2011, 01:54 PM
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Quote:
Originally Posted by TonkaYJ
Thats what the engine builder said I was ready to cry I have been misled through out this build and its starting to hurt $$$$
There is a hell of a lot to a 9.90 car than even HP.

I'd implore you to get a NHRA cert roll bar/cage in that thing before you go out and kill yourself or someone else.

Then look into the other things that are REQUIRED before you can run at the track. There are other safety, fuel system, driver retention and dress, electrical shutoff, etc. requirements that have to be met. These things and more are covered in the NHRA rules book- get one.

Not trying to be unkind, just sayin'.
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Old 08-25-2011, 02:04 PM
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Yes, I would say the cam it too big. about 40 degrees to big.

stall is too big also. 3500 should be enough for a 4.11 gear and a 454.

yes, 9.9 is pretty fast. The faster you go, the more rules you need to follow. Look into that!!
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  #27 (permalink)  
Old 08-25-2011, 02:39 PM
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I'm an S.F.I. Silver-certified technical inspector with license good through this year. This allows me to tech everything except Top Fuel at an N.H.R.A. National or Divisional event. I can and have teched Top Fuel and Funny Car at track-sponsored events for the last 50 years, so if you have the desire to go fast and quick into the 9's and have $30,000 cash, we need to talk. Super Gas would be the closest structured class to what you want to do (9.90 index), so go to Summit and buy an NHRA Rulebook and have a look at what is required just as Mark suggested. Actually, everything you would need is listed in the E.T. section of the Rulebook, but it will be easier for you to look at Super Gas if you're unfamiliar with the rules. I've teched thousands of Super Gas cars.

If you don't have that much disposable cash, pull your horns in and be happy with what you have and get used to looking at your buddy's taillights.

I'll refer you back to the sign that used to hang in the speed shop....
"Speed costs money, how fast do you want to go?"

Richard
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  #28 (permalink)  
Old 08-26-2011, 08:26 AM
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I have most all my safety stuff and the cage kit and a rule book I want a 9.9 Car I will be happy to run it at 10,5 or so. My buddy's car runs 11.1 and has a best et of 10.82 I am asking for alot from my car I know, but I will get this car to perform and beat his. At any cost. I am tired of looking at his taillights!!
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  #29 (permalink)  
Old 08-26-2011, 09:15 AM
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You're gonna need to port those heads, if they flow like the ones I have used. They're OK street heads, but for the hp you need, they may be a problem.

You need all the compression you can get, which means different pistons.
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  #30 (permalink)  
Old 08-26-2011, 09:20 AM
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engine builder says new pistons new rods compresion is going up to 13 to 1 all new valves springs and retainers
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