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01:08:27 - 04/25/2024
V6 Dakotas
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sicminds
GenIII
6/21/2003
14:27:47
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 Subject: stepping up compression
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Message:
What is the normal range of compression in our cylinders?
If it is low does this cause loss of power?
And is it possible to get more compression equaling more power, or am i just really
confused.
bust three times, throw her the peace sign
and not call the b!tch for 3 weeks
now you know thats..................
sic
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Jon
Dodge Dakota
JOIN HERE
6/22/2003
19:16:13
| RE: stepping up compression
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Message:
I think when i compression tested my engine i came up with about 140PSI dry, thats on an engine with almost 90K hard miles on it, i'm not sure what the factory specs are. The most important thing about compression is the difference between cylinders and the difference between wet and dry compression.
Yes, more compression does equal more power (usually) Thats why race cars and high performance muscle cars run about 12:1 compression and you average street car runs about 9.5:1. With higher compression you have to use high octance gas to prevent detonation, also high compression engines are harder to start, especially in the winter. Thats why you see high torque starters advertised in the racing parts catalogs.
When your rings wear out you lose compression and power. The only way to increase compression is to replace the rings, which will get you back to factory compression. If you want higher compression you need to mill the heads or install domed pistons, in some engines the pistons have to be fly cut to make the valves clear.
If you plan on running forced induction lower compression is better. A lot of turbo or supercharged street vehicles run 8.5:1 but thats a whole other ballgame.
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93 DakSport
Dodge Dakota
JOIN HERE
6/23/2003
19:43:48
| RE: stepping up compression
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Message:
buy a Haynes reapir manual..has all the specs and codes
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