How would you go about raising compression on the 5 cylinder motors in both the turbo and non turbo cars?
6 replies to this topic
#1
ProjectT-5R
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Posted 28 October 2004 - 06:15 AM
2000 V70R M56
1995 T-5R M56
1989 244 M47
1985 744T M46
1995 T-5R M56
1989 244 M47
1985 744T M46
#2
JHEIII874T5M
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Posted 28 October 2004 - 06:18 AM
thinner head gasket 
Joseph H. Essaye III
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Dealer for ARP, Samco, Forge, KW Suspension, Aquamist, Quaife Differentials, ATP Turbo, Autometer, MSD, and more!
PM me or email me at jessaye@gmail.com if interested!
#3
EricF
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tbricks spy
Posted 28 October 2004 - 07:07 AM
Oversize pistons... I've never heard any word one way or the other on how much you can shave our heads? Think I've asked a couple of times.
1984 244 GLT - blue rat rod (SOLD!)
1995 850 turbo - Turbonetics CBB T3/T04E, M56H, KW V2, VEMS Standalone, not as shitty as it looks! (I sell to you for good price?)
"Fish, I love you and respect you very much. But I will kill you dead before this day ends." -Santiago
#4
ROB @ VMS
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Posted 28 October 2004 - 07:19 AM
Oversized pistons will not raise the C/R. You can mill the head a tad or you can go with a higher compression piston.
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#5
ProjectT-5R
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Posted 28 October 2004 - 07:59 AM
Rob, just the person I wanted. You had made a comment about VMS would be able to make a 300 hp NA 5cyl. That is what made me raise this question. How would you do that other then raising compression?
And to stay on topic, I understand milling the head cause it would cause i smaller combustion chamber, but the pistons come to the top of the block, so how would you get higher compression pistons? Just have smaller more percision valve reliefs so there is more material there? Cause the valve relief now is just like a large cirle dip in the piston not just a cut for each valve. Is there any other way to make a higher compression piston?
And to stay on topic, I understand milling the head cause it would cause i smaller combustion chamber, but the pistons come to the top of the block, so how would you get higher compression pistons? Just have smaller more percision valve reliefs so there is more material there? Cause the valve relief now is just like a large cirle dip in the piston not just a cut for each valve. Is there any other way to make a higher compression piston?
2000 V70R M56
1995 T-5R M56
1989 244 M47
1985 744T M46
1995 T-5R M56
1989 244 M47
1985 744T M46
#6
volvoman
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Posted 28 October 2004 - 12:04 PM
QUOTE(ProjectT-5R @ Oct 28 2004, 07:59 AM)
Rob, just the person I wanted. You had made a comment about VMS would be able to make a 300 hp NA 5cyl. That is what made me raise this question. How would you do that other then raising compression?
And to stay on topic, I understand milling the head cause it would cause i smaller combustion chamber, but the pistons come to the top of the block, so how would you get higher compression pistons? Just have smaller more percision valve reliefs so there is more material there? Cause the valve relief now is just like a large cirle dip in the piston not just a cut for each valve. Is there any other way to make a higher compression piston?
And to stay on topic, I understand milling the head cause it would cause i smaller combustion chamber, but the pistons come to the top of the block, so how would you get higher compression pistons? Just have smaller more percision valve reliefs so there is more material there? Cause the valve relief now is just like a large cirle dip in the piston not just a cut for each valve. Is there any other way to make a higher compression piston?
This is one example
Terry Coon
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#7
EricF
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tbricks spy
Posted 28 October 2004 - 01:47 PM
QUOTE(ROB @ VMS @ Oct 28 2004, 01:19 AM)
Oversized pistons will not raise the C/R. You can mill the head a tad or you can go with a higher compression piston.
Sorry if it sounded like I meant the first or second oversize kind of oversize.
Terry, do you know how much you can mill off of the head without running into valve clearance issues? (cars with turbo and NA pistons will probably be different amounts)
Or maybe what the stock valve clearance is. That should give a decent idea.
1984 244 GLT - blue rat rod (SOLD!)
1995 850 turbo - Turbonetics CBB T3/T04E, M56H, KW V2, VEMS Standalone, not as shitty as it looks! (I sell to you for good price?)
"Fish, I love you and respect you very much. But I will kill you dead before this day ends." -Santiago
