C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Compression test

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Old Jan 17, 2012 | 07:09 AM
  #1  
JAKE-SON's Avatar
JAKE-SON
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From: Haslet texas
Default Compression test

Hi, looking to do a c. Test on my car and looking.tonsee what my numbers should.be around. Have 401 lt1.
3.875in forged.eagle.crank
6in scat forged rods
-4cc flat top forged.probe.srs.postons
Dart.pro.1, 180 heads, 58cc
290/306 advertised duration cam shaft, 110 lsa.
le ported intake

All I cam remember off top of my head, typing In parking lot

Ryan M.
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Old Jan 17, 2012 | 10:20 AM
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From: Argillite KY
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It will be hard to figure out unless we know how many degrees after BDC the intake valve closes. That changes everything.
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Old Jan 17, 2012 | 11:46 AM
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What are you trying to find out? From what I know it's the difference between all 8 cylinders, not the actual number itself. If one cylinder is off a bunch from all the others then that cyl. is suspect. A leak down test is better for determining engine condition, rings, valve seal, etc. By the way very nice car! The compression tests I have done on 350's have been in the 190 - 195 range.
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