compression

gamble71 · Posted: Thu Nov 05, 2009 7:56 pm Post subject: compression

Just did a quick compression calculation on the 402. Using some rough numbers I came up around 10.25:1 which is about what I was guessing. Will that get by on pump gas, or do I need to drop some points?
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rebeldryver · Posted: Thu Nov 05, 2009 8:26 pm Post subject:

My 454 is running just fine with it.
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gamble71 · Posted: Thu Nov 05, 2009 8:27 pm Post subject:

good to know. Don't wanna put it together, just to have it detonate into pieces Laughing

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rebeldryver · Posted: Thu Nov 05, 2009 8:31 pm Post subject:

A cam with some overlap will bleed off some cylinder pressure. You can't get crazy with ignition lead time.
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dieselgeek · banned Joined: 10 Jul 2009 Posts: 970

spidergearsman · Posted: Thu Nov 05, 2009 10:04 pm Post subject:

the more compression - the cooler it sounds
my next car will be 15:1 on methanol
the nova was almost 13:1
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rebeldryver · Posted: Thu Nov 05, 2009 10:53 pm Post subject:

1fast72nova · Rat Rod Joined: 21 May 2007 Posts: 871

really need to be looking at the quench... cam size, vehicle weight, gears, intended use etc.. Wink

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bowtie6872 · Posted: Fri Nov 06, 2009 8:40 am Post subject:

10.2 will be fine if you don't run 2.43 rear gears..
as nothing is blueprinted in his math run(build)
it'll more than likely be 9.8 after all said and done..

gamble71 · Posted: Fri Nov 06, 2009 9:28 am Post subject:

well, used information from what I think is the replacement for the pistons I'm running. Apparently TRW piston L4420N is no longer made. Used a speed-pro one that appears to be it's replacement. Anyone find any information that piston? I can't
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bowtie6872 · Posted: Fri Nov 06, 2009 9:37 am Post subject:

all piston compression listing ,use the rule
that the heads cc are the same as blueprint (most are bigger that spec)
and deck height is blueprint perfect, same with rod lenth, stroke/etc
if they list 10.2 for 118 cc heads,, it more than likely fall under that,, in a non blueprinted shortblock..
I'm thinking of returning the 10.8's and getting 11.8's

dieselgeek · banned Joined: 10 Jul 2009 Posts: 970

bowtie6872 · Posted: Fri Nov 06, 2009 12:39 pm Post subject:

1fast72nova · Rat Rod Joined: 21 May 2007 Posts: 871

gamble71 · Posted: Fri Nov 06, 2009 2:15 pm Post subject:

this motor has been recently rebuilt. I'm not going to rebuild the heads, as they already have been. I'll check how far down in the hole, the piston is, but other than checking for damage, and a roller cam, she's just going back together.
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