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rfg842(at)cox.net
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archie97(at)earthlink.net
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 Posted: Mon Oct 02, 2006 5:14 am Post subject: Induction leak |
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What I do when assembling an engine, is to initially leave the intake rockers off.
I made small phenolic plates to cover the carb/injector opening, and apply
a couple of pounds of air pressure through a fitting incorporated in the plate.
Any induction leaks will be immediately evident by using a soapy solution
such as dishwashing liquid.
Archie
[quote] ---
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rfg842(at)cox.net
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glcasey(at)adelphia.net
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| Posted: Tue Oct 03, 2006 5:42 am Post subject: Induction leak |
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One way is to first put an air hose from your compressor to the inlet and blow while holding it by hand - avoiding possible excessive pressure buildup. Then as suggested use a soap solution to find the leak.
As for timing, a light won't work. The P lead is either grounded through the points or is grounded through the primary of the coil - they are in parallel. The coil is only a couple of ohm resistance at the most. What I do is use a fairly sensitive ohmmeter (I've used both digital and analog ones for this purpose) and look VERY carefully for a change in resistance. It will go from a short to almost a short when measuring the resistance of the P-lead connection to ground. Don't leave it hooked up if you turn the engine at any speed as the voltage spike created might fry the ohmmeter. This is not nearly as handy as the normal buzz-box, but it works just as accurately.
Gary Casey
[quote]
Anyone got a simple way to find out if there is an induction
leak? Having problems with getting the engine to idle below 1,000 and
it was suggested that this may be a possible cause.
Also have to look at timing. Can I use a 12 volt bulb from the
P lead to the positive lead on the battery to check the Slick mag?
Bob, Wichita [b]
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john beirne
Joined: 02 Oct 2006
Posts: 24
Location: Ireland
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| Posted: Mon Jan 22, 2007 3:18 pm Post subject: Re: Induction leak |
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An Induction leak will cause that cylinder to run leaner, have a look in the exhaust ports and see if one or more of them is less blackened than the rest
what you are looking for is grey/whiteish coating or any sign of over heating
This is not conclusive but should point you in the right direction.
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