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| TUF250 |
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Hi all,
Just bought myself a really neat EL XR8 for a good price, runs like a dream since i did a big service on everything. the car is standard with an exhaust. the motor is great, very strong and dosnt darken oil. i did a comp test for fun and it got a very even 135psi percylinder, how does this sound for a 165,000km car? is this normal/high/low etc? |
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| TerroristGHIA |
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A little low, should be up arind 220psi. Was it a wet or dry test. Try a wet test and see if you get any improvement.
Mine returned 120 even but was due to 8.7:1 comp from the head change. Brett
_________________ The Terrorist ED Retired due to RUST. |
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| TROYMAN |
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wouldnt 220psi relate to around 11:1 compresion ratio???
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| Steady ED |
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as long as it's even, it doesn't mean much.
leakdown test would be a more accurate measure of it's condition, but if it's not using oil and is strong i wouldn't bother.
_________________ ED XR8 Sprint - S-Trim, V500, 249rwkw |
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| xafalcon |
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135psi is fine, being even accross cylinders is another good sign. Your engine is fine. Roughly (very) speaking 135 / 14.7 = 9.18:1 compression ratio. Before anyone gets on their soap box, this calculation completely ignores induction system restrictions (volumetric efficiency) and cam profile. But it is a useful guide.
220psi cranking would be a high compression methanol type engine. Definately not a street engine.
_________________ XA Faimont 351C, AU2 XR8 Manual 5.0, DA LTD 5.0, Mk1 Capri 5.0, 1995 Mustang 5.0, EF2 XR8 Manual, EF2 Fairmont Ghia 5.0, AU3 XR8 Auto, AU2 XR8 Auto, AU2 XR8 Manual Ute, TE Cortina 5.0 Manual, DU LTD 5.0 soon to be manual |
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