compression

vince362291

one minuet it runs fine then go to start it and it just turns over just did a compression test getting 45psi cold and 5o psi hot sprayed starting fluid at clutch side crank seal no change in rpms spark is great as it has the hei conversion I think it needs a new top end rebuild bu not sure about the bottom whats your thoughts oh almost forgot its a 90 with a 3pg robin in it thanks

BGW

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Ghall

you may be ok with the top end. Can you move the crank at all? Take the belt off the and grad the clutch and see if you can move it up or down, if you can move it, rebuild it all.

redcloud

That is low and should be rebuilt or check head bolts for tightness. When you get in the area of 50#s compression you are going to get a no start or bad start low power runner. Should be around 110 to 125#s

vince362291

just finished top end rebuild starts a lot better but now im getting 90 psi not the 110 or better I was expecting its at 90 in forward and reverse

holmsey2012

If you keep spraying ether in it you will need more than just top end

Morgan44

I think you still have a problem. I think anything 100 or below, is still a decent leak. You change the crank seals?

vince362291

no just the top end but I thought I read on here some where that the testers only check that?

redcloud

Crank seals will not effect compression only performance with fuel delivery.
Did you put a new head gasket on and tighten to specs? You will also want to re-check them after it is run a while.
You say top end rebuild, is that with new jug also? If you just replaced piston with stock rings and not over sized you may be a bit off with compression.

vince362291

redcloud yes all new gaskets new piston and rings and new jug all head bolts tightend to 20ftlbs only used black rtv sealent between base and jug should I have used it on all gaskets?

redcloud

Not on head gasket. Did you have to install the rings or did they come on the piston? if you installed them, did you put them on right? There is a top and a bottom to the rings and lined up with pins. If all is ok on that end, run the rig a while and see if they seat up and maybe a bit better compression. Did you use a compression tester that screwed into the plug hole or a hold on type? Screw on will give a better and proper testing. If you are getting good power with the rebuild then you would be ok also.