compression check

[tilleytr7]

what would be the correct pressure on a 1980 tr7 carb engine if one was to check the pressure to see if i have a broken ring, thanks chuck

[TR Tony]

Err, not sure exactly but I should guess at 160 - 170 psi?

More importantly, how does each cylinder compare to the others? If you get one that is significantly lower from the others then that will be suspect. I think they should be within 10% of each other.

Hope this helps.

Tony

<font size="1">1981 2L FHC Cavalry Blue - very original & not rusty!
1980 3.5L V8 DHC Regency Red - on the road again.</font id="size1">

[john 215]

Hi Chuck,
As Tony says 160-170 psi for UK spec is fine on a US spec you guys had lower compression ratio 8.0:1 as against 9.25:1 so a shade lower readings but should as stated, be within 10% of each other. Also quirt some oil down the plug hole and recheck if dramatic improvement then cylinder bore / piston problem.
Cheers john

LIVE LIFE A QUARTER OF A MILE AT A TIME!
1979 3.5 FHC(STATUS PENDING!!)

1982 2.0 DHC NOW A 4.6 WILL BE ON THE ROAD VERY SOON!
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[Bill]

Mine checked out at between 95 psi and 107 psi. It is a 1980 carbed US spec engine, all original (meaning I don't think it's ever been rebuilt or anything). I think it is probably on the low side, but it runs good!

Bill
1980 Persian Aqua DHC