Hi all,
Not happy with the performance of my 2001 XKR , 50k miles
(Allegedly) ran some checks this weekend recorded figures-
Compression test 10-11 bar on all cylinders

Manifold pressure at 5000rpm 135 kpa

All coil packs and spark plugs working ok

Its ok having this information, but if you have nothing to compare
it too then its useless really. Noticed on tickover that had
negative pressure (Sucking) at the main crankase breather.Is this
normal?
Is there any documentation of figures specific to this engine
that a comparison can be made?

Best Regards all
Bob
bt965 at yahoo.com

 

Your engine should have about 9.5 bar when measured with the starter cranking the engine and full throttle (so not with a running engine), so 10 to 11 is too high, and might probably be related to the way the measurement was taken.

If you want to know if your engine is working ok, best is to go to a dyno, preferably one that uses only 1 drum per wheel (so not the dyno dynamics/Maha units that use 2 small drums per wheel) as there is more rwhp info around from these ones to compare with.