Low Compression Rb26, 356.9 Hp In 4wd Dyno In 1bar

[Blitz]

SORRY, I do not want to fist hard for anyone

No problem, best of luck sorting it out

[Rolls]

Same my rb20 had from 100-105 on all cylinders, most being 105 and it runs fine and is not down on power at all.

[wrxhoon]

Same my rb20 had from 100-105 on all cylinders, most being 105 and it runs fine and is not down on power at all.

Yea but his vary a lot more ...

Do a leakdown test and you will see where you loosing compression...

[Rolls]

Oh yeah I was just illustrating that low numbers do not necessarily mean low power but more so the variation.

[rev210]

Since you did the leak down test with a little of oil (10ml is a fair whack) and got no change , when you ought to have an increase I'd say you have ring seal issues big time.

You are going to need to pull it down by the looks.

[DTEK]

Things to Check.

1) valve seating and the reason a) poor prep b)bent valves

2) piston-wall clearance

3) headgasket

4) unlikely but maybe cam timing

I hope this helps.

[DTEK]

if the piston has excess clearance then you may also have too much ring gap.

Edited December 17, 2006 by DTEK

[Adriano]

Does it display any other symptoms of a worn/stuffed motor, oil consumption, smokey, excess blowby? With the power it is making, there is no way that those compression readings can be correct, especially as they dont vary excessively, assuming it isnt a worn 1000hp motor.

[pnblight]

midnightrider can i ask what your new cam lobe clearances were set to with the shims as you had new valves etc yes? just ask your head builder and check what is running now.

pete

ps just an idea