Raising compression and quench?
11-22-2005, 06:00 AM
#1
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Raising compression and quench?
Roughly, how much would raising the compression from 9.5 to 10.0 on a cammed 5.3 be worth?
What is the optimal quench area and how does one determine it? How is it affected by mods such as porting and milling heads, or increasing or decreasing the thickness of the head gaskets?
Thanks guys.
What is the optimal quench area and how does one determine it? How is it affected by mods such as porting and milling heads, or increasing or decreasing the thickness of the head gaskets?
Thanks guys.
11-22-2005, 08:34 AM
#2
Originally Posted by tdrumm
Roughly, how much would raising the compression from 9.5 to 10.0 on a cammed 5.3 be worth?
What is the optimal quench area and how does one determine it? How is it affected by mods such as porting and milling heads, or increasing or decreasing the thickness of the head gaskets?
Thanks guys.
What is the optimal quench area and how does one determine it? How is it affected by mods such as porting and milling heads, or increasing or decreasing the thickness of the head gaskets?
Thanks guys.
11-23-2005, 02:42 PM
#3
Half a point will be good for ~10hp across the board.
A tighter quench will help ward off detonation and give you a better squish area. A full point is going to be hard to pull off with only heads and gaskets and still have decent p2v for a decent size cam. I had my heads milled .040 and with a stock .054 gaphite gasket, mine was ~10.25:1. I was running a fairly small cam though (214/216 .535/.545).
A tighter quench will help ward off detonation and give you a better squish area. A full point is going to be hard to pull off with only heads and gaskets and still have decent p2v for a decent size cam. I had my heads milled .040 and with a stock .054 gaphite gasket, mine was ~10.25:1. I was running a fairly small cam though (214/216 .535/.545).
11-24-2005, 06:10 AM
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So with the additonal chamber volume I'm getting from the porting, my heads are going to be milled .045. This will give me 10.0:1 with stock gaskets. If I went to .045 gaskets I'd get 10.2:1.
Problem is, cometics aren't made in a 5.3 bore size. They are 3.910" bore. Think that will be a probelm?
Think they'll fit with my cam?
Problem is, cometics aren't made in a 5.3 bore size. They are 3.910" bore. Think that will be a probelm?
Think they'll fit with my cam?
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11-24-2005, 07:32 PM
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The general concensus is that I'll be good, but I'll clay it and have a set of stock gaskets on hand just in case. I don't want to get into flycutting pistons at home.
11-27-2005, 09:44 AM
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U CAN ANGLE MILL THEM.ALSO MY 5.3 HEADS R SHAVED 30 AND R NOW ON MY 6.0 WORK GREAT.ALL YOU HAVE TO DO IS WHEN YOU SHAVE U'R HEADS IS SHIM UNDER THE ROCKER BAR THE SAME AMOUNT.
tighter quench.
NEVER HEAR OF THIS BUT YOU ALSO CAN GET THE CHAMBERS WELDED TO RAISE COMP.
tighter quench.
NEVER HEAR OF THIS BUT YOU ALSO CAN GET THE CHAMBERS WELDED TO RAISE COMP.
11-27-2005, 06:28 PM
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Originally Posted by litreddevil
U CAN ANGLE MILL THEM.ALSO MY 5.3 HEADS R SHAVED 30 AND R NOW ON MY 6.0 WORK GREAT.ALL YOU HAVE TO DO IS WHEN YOU SHAVE U'R HEADS IS SHIM UNDER THE ROCKER BAR THE SAME AMOUNT.