interpreting leakdown test results

[Calibrator]

I am willing to bet money that if you did the test again no 4 would have a much better result.
I have been caught before. When you crack the plugs loose a piece of carbon wedges under the exh valve seat and gives you a false reading.
I ALWAYS loosen the plugs half a turn and start the motor and give it a rev at 3000 or so for a few seconds to clear any loose carbon out.

[Glenno]

Depending on the head desgin you can give the valves a hit with a hammer to open and reseat them whilst the compressed air is applied, makes a loud pop when you do it.

[evasive]

cheers for the info.

Also on the last dyno it was running lean across the WHOLE map.

I'm thinking this is due tot he PCV valve sucking in all the crap vapour and smoke back into the intake?

because it is sucking the vapours into the intake..the rocker cover breather doesnt hasn't got any vac to suck it out ..so its just getting pushed out

[evasive]

Also had a look at it more today..

Started the engine, usual smoke coming from rocker cover..

Took out dipstick, blew some compressed air into the rocker cover breather hole..

smoke coming out of dipstick hole.

[BigMuz]

Umm, the rocker cover and the dipstick hole are both attached to the crankcase. You want to put compressed air in the cylinder and see where that leaks mate.

[evasive]

yeah cool i realise that too, just pointing the fact out.