Quote:
Originally Posted by Trackrash
I have not seen this spec advertised. You learn something every day around here.
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It appears in the Porsche world, lift at TDC is the cam timing spec typically given. I'm sure it's to make the cam timing easier. But its not very accurate.
2V cams will always be created with the lobe sep angle and the intake centerline numbers being the main factors, for any engine they are made for. The design will give the lift numbers at TDC and these are what are given out for a setting number.
Close enough is good enough is what is considered here, typically. But there are too many areas for error. Cam grinding errors, rocker arm regrinding errors, cam housing machining tolerances etc.
When you set the timing positions at the crank, you can check the lifts at any angle side to side. For those that what to make sure their engine will produce the most power possible, its these little things that make a big difference.