Re: 440 compression ratio question
[Re: Osyman]
#560430
12/23/09 02:15 AM
12/23/09 02:15 AM
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Joined: Dec 2003
Posts: 5,314 Carstairs, Alberta, Canada
dave571
master
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master
Joined: Dec 2003
Posts: 5,314
Carstairs, Alberta, Canada
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with a standard deck they typically cc around 78-80 cc's. Aftermarket pistons, it's anyones guess as to the ratio. Plug the measurements into a comp ratio calculator, like the one at www.kb-silvolite.comThe numbers are usually surprising, and not in a good way.
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Re: 440 compression ratio question
[Re: 73roadbird]
#560434
12/23/09 10:28 AM
12/23/09 10:28 AM
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Anonymous
Unregistered
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Anonymous
Unregistered
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i think you meant .160 & .162 down in the hole. .0160 & .0162 actually isn't that bad. would give you around 9.2:1 CR. with open chambers.
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Re: 440 compression ratio question
[Re: 73roadbird]
#560438
12/28/09 12:46 AM
12/28/09 12:46 AM
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Joined: Feb 2007
Posts: 1,025 Las Vegas, NV
dodgeboy11
super stock
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super stock
Joined: Feb 2007
Posts: 1,025
Las Vegas, NV
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Quote:
I don't know if this will help you or not, but I'm working on a 75 440 that's out of a truck, and the pistons measured .0160 to .0162 down, so compression would be quite low from factory. Not to hijack this post, but could I deck the block and re-use the factory pistons or get earlier year 440 pistons to get a better compression ratio. Looking to do a budget build, Thanks...
You can buy new KB hyper pistons from summit for 310 bucks with a .075 quench dome or 320 for flat tops (I have no idea why the flat tops are 10 bucks more).
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Re: 440 compression ratio question
[Re: dodgeboy11]
#560439
12/28/09 12:48 AM
12/28/09 12:48 AM
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Joined: Feb 2003
Posts: 21,318 Manitoba, Canada
DaytonaTurbo
Too Many Posts
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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Quote:
You can buy new KB hyper pistons from summit for 310 bucks with a .075 quench dome or 320 for flat tops (I have no idea why the flat tops are 10 bucks more).
Yes the only downside being you have to have your rotating assy rebalanced. With the TRW's they're made so their weight is 'close enough' to stock pistons that many guys run without a rebalance.
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