Thread: SC Cam Question
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fredmeister fredmeister is offline
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Join Date: Oct 2002
Location: Baltimore, MD, USA
Posts: 2,232
Did anyone ever consider the effect on valve cooling by changing the cams on these motors? I mean 80% of the heat that is extracted from the valves is done during the contact of the valve head with the valve seat during closed position. When you alter the valve timing to make more overlap and valve duration, you are taking away some of the cooling effect....I just wonder if any experience has shown negative effects on the exhaust valves for the turbo engines when changing to more aggressive cams.
Being a turbo engine, the boost makes up for poor cam timing more so that a normally aspirated car, though the effect on off-boost running may make the cam choice more effective to increase the low end on these cars.
1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, B&B intercooler, Snow Perf water/meth injection, Rarlyl8 headers, Garret GTX turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),--running 0.7bar max
---"When you're racing it's life! Anything else either before or after, is just waiting"
Old 07-20-2008, 08:21 AM
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