Some questions on 3.0 NA project.
#16
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Originally Posted by Jfrahm
There is a 928 with variocam heads, the custom cams were _very_ expensive but they were billet.
This page shows the S4 heads converted to fit a 968 variocam unit:
http://928sg.com/heads.htm
-Joel.
This page shows the S4 heads converted to fit a 968 variocam unit:
http://928sg.com/heads.htm
-Joel.
#18
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On an S2 it'd be way easier just to add a 968 head given the custom welding and machining to get the variocam unit in the S2 head, the cost of the parts, cam modifications, cam cover, etc. Plus the 968 head has bigger valves and the cams are profiled for the variocam.
I'd guess about 2/3rds of the 968's 30 more HP over the S2 comes from the variocam, cams and valves and the rest is from the MAF and the engine management.
I'd guess about 2/3rds of the 968's 30 more HP over the S2 comes from the variocam, cams and valves and the rest is from the MAF and the engine management.
#19
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I have access to a 968 head reasonable, but someone told me that the 968 head on S2 block wouldn't work the variocam, it would just be dead weight in there? What is the secret to getting the 968 head transplant to work? (if in fact it is easier that the variocam transplant)
James Reeser
89 944 S2 (variocam wanna-be)
James Reeser
89 944 S2 (variocam wanna-be)
#20
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Wow can't wait to see the answer to this one. Looking for a 968 head now.
#21
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You would have to bodge up something to switch the variocam unit. An RPM window switch and a vacuum switch might work. Hysteresis would be a problem if you happened to cruise right at the RPM the variocam was getting switched, but a vacuum switch would prevent that if set to disable the variocam at light or cruise throttle.
-Joel.
-Joel.
#22
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I mentioned already in the 1st post that we'll use standalone engine management and I would like to not just switch the VArioCam on/off but make it truly variable through rpm range by using pulsewidth modulation.