How Dead Is This Rb26, Compression Results

[dancn]

I've bought a no running project R32 GTR, with an engine problem. I've no history of the car, or any info on the engine problem.

I suspect the car has been usused for a long time.

I have little to no compression. readings taken on cold (obviously) engine 70,35,0,0,0,0psi.

i had suspected piston damaged/holed pistons etc..

I pulled off the cam covers, all looks good, all lobes being well lubbed, oil light extinguishes after several cranks of the starter motor.

From the small amount of the pistons i can see through the sparkplug holes, they appear ok, with this limited viewing area, all pistons are moving during cranking.

My cranking speed is quite slow, much slower than all my RB25s.

Valve timing look good also.

I thought of valve lifter problems, but I believe the RB26 are not hydraulic?

The thing thats throwing me off the piston damage is for such a dramatic drop in compression, surely the oil would have shot out the catch tank, dipstick area, but oil level is fine, no evidence of excessive crank pressure.

Before I pull the head off for a look any ideas?

Edited November 29, 2007 by dancn

[Craved]

try the oil in the spark plug hole and retest compression - should help determine if piston vs ring damage - but regardless its getting pulled down

so hop to it

rb26 is definately solid lifters too

[rb26s13]

just start pulling it out... somethings let go on all of them.. for 3 4 5 and 6 to have absolutely nothing.. i'd assume valves stuck open/bent/broken or really big hole in pistons either way.. your motors f**ked

.. ive got a valve stuck open on number 5 on my 26 at moment.. and it reads 0 compression.. all others read 165psi

Edited November 29, 2007 by rb26s13