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  '74 to '78 -- The Mustang II
  COMPRESSTION HELP

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Author Topic:   COMPRESSTION HELP
RONNIE
unregistered
posted 12-30-2005 05:09 AM           Edit/Delete Message   Reply w/Quote
Hello. I recendly had to replace my short block do to a cracked CID. I bought a New shotr block from Heartland Engine builders. would have done the rebuild myself but no good block and got my New short block for a fair price, My concern is he said the motor would have 10.1 Compresstion with my parts but when i put the motor back togather the pistons was not dome pistins like i had before they just had really deep fly cuts in them, So i called him and he asured me that the motor would have 10.1 comp.I know theres no way to tell now what comp. i have,The track is closed for the season, Can someone tell me how much HP i would lose if i did go from 10.5.1 to 9.5.1? Or is there a flat top piston that could make 10.5.1 comp. with my 60 cc edelbrock RPM heads. The motor feels good but cant tell on the street, If you want to see what all i have in my motor go to this link. Thanks for any Advise, Ronnie www.rons.mustangii.net

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Whitson
Gearhead

Posts: 110
From: Western Canada
Registered: Dec 2005

posted 12-30-2005 10:54 AM     Click Here to See the Profile for Whitson   Click Here to Email Whitson     Edit/Delete Message   Reply w/Quote
Well, there's no question you lost one point of compression. How much power you lost depends on what fuel you run at the track. Pump gas, you didn't loose much. If you run race fuel, you lost a lot more.

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RONNIE
unregistered
posted 12-30-2005 04:15 PM           Edit/Delete Message   Reply w/Quote
Thanks for the reply, I always just use pump gas. Ronnie

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COBRAII7678
Gearhead

Posts: 117
From: Festus Mo U.S.A
Registered: Sep 2004

posted 12-31-2005 12:54 AM     Click Here to See the Profile for COBRAII7678   Click Here to Email COBRAII7678     Edit/Delete Message   Reply w/Quote
Ronnie, get yourself a compression gauge. Easy way to see your true compression.

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RONNIE
unregistered
posted 12-31-2005 09:28 AM           Edit/Delete Message   Reply w/Quote
quote:
Originally posted by COBRAII7678:
Ronnie, get yourself a compression gauge. Easy way to see your true compression.

Thanks for the reply I have a comp. gauge and check all cid.s It reads 165-170 psi. Thanks Ronnie

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