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papajam · 02-07-2004

I don't think you'll find compression data anywhere since, as was said before, the numbers are not absolute but rather just a comparison with each other. Cylinder pressures within 10% of each other is considered normal. No disrespect here but I'd think that the Garage should know that. Keep in mind that for good test results, valve clearances and cam timing must be in spec, all the sparkplugs must be removed and the throttles held wide open.
Having only one bent valve is extremly unusual too. Cam timing is the usual cause for bent valves in which case all four valves on the affected side would get bent, not just one. Perhaps the valve is burned and not bent?

02-07-2004	#9 (Post Link)
papajam Club Member Club Member Number: 419 Join Date: Apr 2004 Location: New Jersey USA Posts: 250 Member car: White GTVs Unite!	Re: Compression Data for 1750 Engine I don't think you'll find compression data anywhere since, as was said before, the numbers are not absolute but rather just a comparison with each other. Cylinder pressures within 10% of each other is considered normal. No disrespect here but I'd think that the Garage should know that. Keep in mind that for good test results, valve clearances and cam timing must be in spec, all the sparkplugs must be removed and the throttles held wide open. Having only one bent valve is extremly unusual too. Cam timing is the usual cause for bent valves in which case all four valves on the affected side would get bent, not just one. Perhaps the valve is burned and not bent? Jim 68 Mk1 Italian delivery 71 Mk2 US delivery 89 Spider Veloce