C15 compression test

[DAVE BRADY]

Hi,

Does anyone know what reading I should get when testing C15 compression?  Standard compression.

Dave.

[rhyatt]

Anything around 130/150 ish psi
Throttle wide open.
7.5 cr x 14.7 psi
Give or take

[DAVE BRADY]

Thanks.  I am about to go and check it.

Dave.

[DAVE BRADY]

Hi,

7.5 x 14.7 gives 110.25.  I got a reading of 105 so it should be fine.

Dave.

[rhyatt]

You're in the right area,
They're soft to turn over certainly

[V500]

The CR X 14.7 doesn't give a good accurate reading though. It's more complex than that.

[DAVE BRADY]

Hi,

What should it be then for 7.5 compression?  Unlike A65 manuals there is nothing in the C15 blurb.

Dave.

[rhyatt]

Most car engines I used to test were in the area of 150.
Agreed the cr of your average car engine was higher than a c15 .
I suppose a leak test is the next , but if your c15 is running well , then that's the main thing.

[DAVE BRADY]

Hi,

It is a recent acquisition so just going through it to see what is what.  It is a runner and looks decent so after a few tweaks it should be fine.

Dave.

[rhyatt]

Just be precise when checking valve clearances , the owners handbook is clear instructions.
Don't just use tdc

[DAVE BRADY]

Hi,

Thanks.  I have the RR books that came with it to refer to as well.  If I remember from having a B40 the inlet push rod should be just able to be rotated to set the exhaust and vice versa.

Dave.