10:1 Compression
Thread Starter
Pro
Joined: Oct 2003
Posts: 550
Likes: 0
From: Hesperia California
10:1 Compression
I have an 89 with a recently rebuilt motor. The builder took it to 10:1 and put in a nice cam. He was limited due to Calif. emmissions The car runs great and sailed through smog.
I am most likely going to put long tube headers and a nice exhaust on the car, however I want more.
With the compression being what it is, is it risky puting a SC on?
Thanks
I am most likely going to put long tube headers and a nice exhaust on the car, however I want more.
With the compression being what it is, is it risky puting a SC on?
Thanks
Supporting Vendor
Joined: Oct 2004
Posts: 761
Likes: 68
Good Morning Guys, I'm not so sure I agree! In 1970 I supercharged my first engine: a Dodge '340' with 10:1 CR and domed pistons (the worst of all combinations by today's standards for detonation). By necessity I "discovered" water injection. At first none of the then available systems helped - mainly because they injected far too little water. After much experimentation I was a happy camper.
With the proper water/alcohol injection system and an appropriate spark curve there is no reason not to supercharge your engine. You may not run as much boost as with a lower CR, but your inrease will be appropriately greater at a given boost pressure.
Best regards,
Greg
With the proper water/alcohol injection system and an appropriate spark curve there is no reason not to supercharge your engine. You may not run as much boost as with a lower CR, but your inrease will be appropriately greater at a given boost pressure.
Best regards,
Greg
Melting Slicks
Joined: May 2004
Posts: 2,856
Likes: 187
From: Earth
I had a ATI SC on my 89. My motor on paper was 10.5 but when I called LPE they said more like 10.75 which at this point I had already blown the head gasket and melted the head between cyl. 3 & 5. I was boosting 6 lbs.
I wouldn't do it was 10:1 just my .02
I wouldn't do it was 10:1 just my .02
Safety Car
Joined: Apr 2001
Posts: 3,525
Likes: 2
From: Houston TX
I ran my old D1 combo with just shy of 10 psi and over 11:1 scr (52cc chambers on AFR 190s, 0.028" head gaskets) for ~3 years. The combo ran very well. The secret to survival is in the tune.
I think with the current ability to tune, it is certainly possible to add boost to a 10:1 scr engine.
Aaron
I think with the current ability to tune, it is certainly possible to add boost to a 10:1 scr engine.
Aaron
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Drifting
Joined: Jun 2001
Posts: 1,704
Likes: 459
From: Mass Mass
I have been running one of Greg's old Paxton kits, with H20 injection, on a ZZ4 crate engine for years with no problems.
About 7 psi boost.
ZZ4 published spec's say 10:1 compression.
Like they say, the trick is the right fuel and spark curves...
And a little H20
About 7 psi boost.
ZZ4 published spec's say 10:1 compression.
Like they say, the trick is the right fuel and spark curves...
And a little H20