Compression Ratio?
Melting Slicks
Joined: Apr 2002
Posts: 3,019
Likes: 0
From: down that one road next to that big tree
Re: Compression Ratio? (UB2 SLOW)
ask the guy who did your heads if they were decked. if they were not decked your compression is the same as stock or maybe 0.1 less from the chambers being worked.
Le Mans Master
Joined: Oct 1999
Posts: 9,713
Likes: 3
From: Sachse Texas
Cruise-In I Veteran
Cruise-In II Veteran
Re: Compression Ratio? (UB2 SLOW)
If you went from a ~56-58 cc head to a 54.4 cc head, and nothing else changed, you probably added .2-.3 points. So you are probably somewhere in the vicinity of 10.6-10.7.
Here is one calculator...
http://www.rbracing-rsr.com/compstaticcalc.html
Here is one calculator...
http://www.rbracing-rsr.com/compstaticcalc.html
Thread Starter
Burning Brakes
Joined: Jul 2002
Posts: 822
Likes: 0
From: I could tell but then I would have to kill you
Re: Compression Ratio? (gtsyellow)
ask the guy who did your heads if they were decked. if they were not decked your compression is the same as stock or maybe 0.1 less from the chambers being worked.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: Compression Ratio? (UB2 SLOW)
He will shave a little off the heads where they attach to the block to assure flatness. If he takes off more than a few .001s he may need to also shave the intake base to assure a good matchup.
Safety Car
Joined: Feb 2002
Posts: 4,286
Likes: 4
From: Guam
Re: Compression Ratio? (gtsyellow)
You're probably not going to realize much of a difference. A couple cc's won't affect any noticeable change.
Be sure to mill the intake to match the heads. If your ports are mismatched, you will likely notice a loss.
:cheers:
Be sure to mill the intake to match the heads. If your ports are mismatched, you will likely notice a loss.
:cheers:
Thread Starter
Burning Brakes
Joined: Jul 2002
Posts: 822
Likes: 0
From: I could tell but then I would have to kill you
Re: Compression Ratio? (Sharky Guam)
You're probably not going to realize much of a difference. A couple cc's won't affect any noticeable change.
Be sure to mill the intake to match the heads. If your ports are mismatched, you will likely notice a loss.
:cheers:
Be sure to mill the intake to match the heads. If your ports are mismatched, you will likely notice a loss.
:cheers:
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Drifting
Joined: Apr 2001
Posts: 1,403
Likes: 0
From: Denver CO
Re: Compression Ratio? (UB2 SLOW)
He has my intake, heads and the trottlebody. He is going to port & polish and make sure everything is matched. I am hoping for some serious flow. I ran the setup on Dyno 2000 software with 10.4 compression and it gave me 365 hp at 5500 and 435 tq at 4000. I am not sure how accurate the software is. After I get the actual flow numbers I will put them in and check again. [/QUOTE]
What is he charging you. I want to do the same and was wondering what it should run?
Thread Starter
Burning Brakes
Joined: Jul 2002
Posts: 822
Likes: 0
From: I could tell but then I would have to kill you
Re: Compression Ratio? (Glasman66)
What is he charging you. I want to do the same and was wondering what it should run?[/QUOTE]
He is charging me $500.00 for the whole thing. His web site is http://www.actionautomotiveinc.com.