Brandon73fjord

Compression test. Acceptable range?

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I'm having my engine compression tested. My mechanic wants to k ow what's acceptable for this type of engine. I'm askink for a range in numbers(120-160). Thanks

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140done correctly on my tii

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Consistency within 5% hole to hole is ideal, with 120 to 160 net acceptable as gauges and operators very.

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valves adjusted cold (0.006")

battery fully charged

hold throttle wide open while cranking

have all plugs removed

compression test 1502 - 2002tii

good = above 10.5 bar (149.3 lb/in)

normal = 9.5 bar (135.1...149.3 lb/in)

poor = below 9.0 bar (128 lb/in) = you need work

test procedure

use calibrated tester,

with battery fully charged,

engine at operating temperature

and throttle fully open.

Turn engine over at starting speed.

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I guess I know why I have to run super...

172psi on the motor built by BC & Me.

BD

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engine that came out of my 75... 100 plus or minus 20psi.

engine that went in.....180 plus or minus 2psi

cd's got the correct info, of course, for a stock engine. cam/piston/ring/crank whatever upgrade will cause variance from stock numbers.

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