Calvin:
You cannot do a compression test to determine the static
compression ratio. The issue is that the camshaft also affects the
cranking pressure, and the DPO may have changed one or both of these.
The best way to determine the static compression ratio is to
measure the head height using a dial caliper. The table shown below can
then be used to estimate static compression ratio (should be very
close).
The compression check is best used to determine which
cylinder(s) have a problem with rings, valves, or any other factor that
will degrade the performance of that cylinder compared to the others.
Cheers,
Vance
http://www.goodparts.com/tech_docs/TR6_Compression_Ratio.html
-----Original Message-----
From: owner-6pack@autox.team.net [mailto:owner-6pack@autox.team.net] On
Behalf Of Calvin Allen
Sent: Tuesday, January 27, 2004 4:05 PM
To: 6pack@autox.team.net
Subject: TR6 Compression
Hi, Gang
The engine in my TR6 has been rebuilt about 5 years ago, before I bought
it.
If I do a compression test can I determine how much the head was shaved
down
during the rebuild? What is normal compression and what number is high
compression. I will do a test in the next month to see what the
compression
is at. Should I use the dry test numbers or use the wet test numbers?
Is
there a cross reference between Compression Ratio and actual
compression?
Any ideas would be great, thanks
Calvin
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