!991 Evinrude VE70TLEIE-Compression

[rhenryiii]

I was told by whom was billed as a master OMC tech that the 1991 VE70TLEIE had compression relief ports that would cause a compression check to read 10-15 PSI below actual. Mine runs pretty good, as far as I can tell. I have only owned this one a couple of years but given its age I wouldn't expect it to run as new. On my cheap Harbor Freight tester, I consistently obtain 90psi on all (3) cylinders. Per my orginal OMC Service Manual, I am to check with all plugs out and throttle at wide open. Obviously it doesn't specify what PSI they should be just they should all be close. I thought about borrowing a tester from local parts store but then read those are usually also crap,
Any experts have any thoughts on this?
Thanks

 

[racerone]

Throttle does not need to be wide open to do a compression test.

 

[rhenryiii]

Throttle does not need to be wide open to do a compression test.

I had heard that but since my original OMC factry service manual said to, I thought I would check it both ways. Readings were identical. I really hope someone can verify or dispute what I was told about the 91 having compression relief ports. I cannot recall what he siad as to what the reason was.

 

[faztbullet]

Yes it has relief ports and compression will be in the 90-95 psi range at cranking

 

[rhenryiii]

Yes it has relief ports and compression will be in the 90-95 psi range at cranking

Now if I can just confirm that this model has the ports.

 

[rhenryiii]

Now if I can just confirm that this model has the ports.

Sorry I was on Lake and didn't see that you confirmed for me.
Thanks