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Nov 07, 2015 11:35 pm
Nov 07, 2015 11:35 pm
Subject: Re: Tappet clearances - why the variation?
Sorry to come late to this discussion but my advice would be to stick to .004" Much as we love our cars not all Lagonda engineering was done with critical analysis and followed up by comprehensive testing. I suspect that doubling the tappet clearance between the standard and blown engine was just an "off the cuff" decision. I run a high lift cam and frequently take the engine to 5000 rpm. Never had a problem with a burnt valve and haven't needed to adjust the tappets for the last two seasons. Still getting 160 psi compressions. Large tappet clearances will only reduce the valve opening and may even cause the valve caps to fall off. Not to mention upsetting the wife !
Sorry to come late to this discussion but my advice would be to stick to .004" Much as we love our cars not all Lagonda engineering was done with critical analysis and followed up by comprehensive testing. I suspect that doubling the tappet clearance between the standard and blown engine was just an "off the cuff" decision. I run a high lift cam and frequently take the engine to 5000 rpm. Never had a problem with a burnt valve and haven't needed to adjust the tappets for the last two seasons. Still getting 160 psi compressions. Large tappet clearances will only reduce the valve opening and may even cause the valve caps to fall off. Not to mention upsetting the wife !