Help with calculating skim amount to raise compression?
Thread Starter
TECH Apprentice
Joined: May 2013
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Help with calculating skim amount to raise compression? Can anybody please offer any advice as to how to calculate the amount required to raise compression?
I have a 5.3 L33 which as standard has 9.9:1
I have the heads off and want to get the head skimmed to ensure it is flat before refitting and figured that rather than just remove the bare minimum I could remove a specific amount to raise the compression.
Ultimately I would like to increase it to around 10.2:1
The heads are still standard so I figure the heads measurement should be known (combustion chamber), and I presume I would therefore just need to know the head gasket thickness in order to calculate the required amount of material removal.
???
I have a 5.3 L33 which as standard has 9.9:1
I have the heads off and want to get the head skimmed to ensure it is flat before refitting and figured that rather than just remove the bare minimum I could remove a specific amount to raise the compression.
Ultimately I would like to increase it to around 10.2:1
The heads are still standard so I figure the heads measurement should be known (combustion chamber), and I presume I would therefore just need to know the head gasket thickness in order to calculate the required amount of material removal.
???
Thread Starter
TECH Apprentice
Joined: May 2013
Posts: 329
Likes: 9
Many thanks for the reply.
How do I use that information to calculate a new compression ratio increase?
I haven't found a definitive answer to the question of the 799 5.3 head CC but it appears to be around 64.
How do I use that information to calculate a new compression ratio increase?
I haven't found a definitive answer to the question of the 799 5.3 head CC but it appears to be around 64.
Last edited by TableLeg; Sep 6, 2013 at 06:18 PM.
Thread Starter
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OK, so using this calculator I 'think' I've come up with the necessary figures to calculate the compression ratio (assuming all the details I found on the internet are correct!).
http://www.gtsparkplugs.com/CompRatioCalc.html
From this it would appear that 0.020 removed from the heads should equate to 10.37:1
0.010 should equal 10.13:1
0.015 should equal 10.25:1
Any body know if this sounds about right?
http://www.gtsparkplugs.com/CompRatioCalc.html
From this it would appear that 0.020 removed from the heads should equate to 10.37:1
0.010 should equal 10.13:1
0.015 should equal 10.25:1
Any body know if this sounds about right?
Thread Starter
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Joined: May 2013
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Last edited by TableLeg; Sep 9, 2013 at 12:41 PM.
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I found the single quench pad LS1 heads 806/853/241 are .001 more for a cc then the 243/799 chamber. thats going to 56-54 cc. then you start cutting into the chamber more, but I would weld them up as your cutting .100 more so have to cut the intake face then.
I can't remember but think it was .006 per cc for them and its .007 per cc for the ls1 style. if you search I bet your find it. but I think you L33 has 243s
I can't remember but think it was .006 per cc for them and its .007 per cc for the ls1 style. if you search I bet your find it. but I think you L33 has 243s
Thread Starter
TECH Apprentice
Joined: May 2013
Posts: 329
Likes: 9
I found the single quench pad LS1 heads 806/853/241 are .001 more for a cc then the 243/799 chamber. thats going to 56-54 cc. then you start cutting into the chamber more, but I would weld them up as your cutting .100 more so have to cut the intake face then.
I can't remember but think it was .006 per cc for them and its .007 per cc for the ls1 style. if you search I bet your find it. but I think you L33 has 243s
I can't remember but think it was .006 per cc for them and its .007 per cc for the ls1 style. if you search I bet your find it. but I think you L33 has 243s
My heads are definitely 799's, as are my pal's who also has an L33.