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stripe70

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Reply with quote  #1 
Just done a compression test on 2.0 silvertop on carbs
60, 70, 20, 60 psi
Looks very poor but ran good enough

Just wondered what's the easiest and cheapest option to go with to sort it


1. rip it out myself, strip it and get fully refurbished head and bottom
2. Swap it for another 2nd hand silvertop, blacktop (not sure if that's just straight swap of if it complicates anything)
3. Buy reconditioned engine

(don't want to go down BEC route as can't be bothered with conversion)
Any idea on costs and best way to go
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catman

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Reply with quote  #2 
Would have thought the cheapest option is to swap for another silvrtop if you can find one, but this is risky because there sent any decent ones left. The other end of the spectrum is a new blacktop. That's the option I would take.

Ed
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stripe70

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Reply with quote  #3 
Are blacktops a re straight swap for silvertop
Will everything from silvertop fit straight over to blacktop. ie inlet, 45`s on aold alpha ignition system, exhaust etc
I`m sure i`ve read that engine mounts are different locations etc

If they are more available & a direct swap, i`d go for that
Whats an acceptable price to pay for one
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JohnSix

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Reply with quote  #4 
Those figures are very low, think they should be double what you have.

Are you sure the tester is good? did you get a good seal in the plug holes?

If the tester is good then I would take the head off and check the valve seats first, you could take it to your local engine builder where he can test this out, could be an easy fix before getting another engine.

John.
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stripe70

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Reply with quote  #5 
Last test was from cold
Just warmed engine up then re done compression test
All 4 are at about 60 psi now
One of the plugs is quite sooty

The reason I'm checking is last run out, based k fired and spat fuel out of carb and had a minor carb fire on 1 & 2 cylinder
Just before that the revs went sky high and I had to turn engine off to stop it
It then drove all day good as new

I'm start to think may be timing, valves etc ie the head may be the issue of my troubles and low compression

Any opinions welcomed before I go down the wrong route☺
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Dick

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Reply with quote  #6 
Are you doing the compression test with the throttle wide open and all the plugs out, as with readings that low I would think it would not run, is the engine spinning over fast. You could also try another gauge
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stripe70

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Reply with quote  #7 
Throttle wide open
I`ve done test removing one plug at a time & also with all plugs out & testing one at a time, same.
Seems to spin over ok
Seems to run ok to me. thought it was rough at first until it warmed up a bit but seems ok

I borrowed the gauge from a friend, i guess i could try on another car maybe to check gauge


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stripe70

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Reply with quote  #8 
Gauges re checked elsewhere & OK

Think i`m going to remove head
test valves & cylinders for leaks damage etc & take it from there
Hopefully just a top or bottom end refurb

If anyone has any opinions on the issue etc feel free 
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Dick

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Reply with quote  #9 
Something is a miss at 60psi you would have to get the revs up to keep it running and not have much chance of starting it. Be for you strip it down I would get a leak back test done on itt that will show what is at fault if anything
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