Join Date: Nov 2000
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Re: Blow By?
If it runs strong and has that compression (not seriously low), I wouldn't let a little blowby dictate that I replace the engine. I'd set up some kind of a catch can for the pcv filter. and have the filter dump into it. If you have the stock type air cleaner I'd move the pcv filter away from it as it must be just fouling the air filter. Or if you can set up a sealed can with a drain on the bottom and the filter on the top, it will keep the filter from getting so clogged with oil that it doesn't vent well anymore. I'm sure you know this, but that filter is supposed to be drawing air in, not venting fumes out, but given enough crankcase gasses (to obverwhelm the capacity of the pcv system), it's better it leaves thru the filter than blowing out gaskets. Also, valve covers typically are baffled at one end and that's where the pcv valve should go and the other end is for the line to the filter. I imagine a creative guy could remove his valve cover and tack weld on a sheet metal baffle beneath both openings to reduce the exposure to oil.
Is it rich overly rich at idle? I'd imagine there is somewhere a web page explaining the various circuits on a weber and how to tune them. You will typically set up the idle mixture with a pair of mixture screws and alter the mid to wide open throttle with jets. If there's something in between on this carb, you will have read up on that. I know that jet kits are available for the webers. You just don't want to be leaning out the jets if the idle mixture is all that's off or vice versa. Maybe consider investing in a 02 sensor based mixture gauge. They seem to be getting reasonable in price. Would soon pay for itself in gas at todays prices.