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Join Date: Jun 2002
Location: Seattle- Eastside
Posts: 380
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What are hottest cams for CIS pistons?
I am considering swapping to tbitz's efi kit. As a stand alone mod it appears to have promise; even using the most conservative figures it appears to give at least an 11hp increase all by itself, not to mention the additional mpg and throttle response. What is the hottest cam I could use without worrying about the valves hitting the CIS ("bump and dip" type) pistons? Before the efi kit many people swapped in webers or PMOs on CIS 3.0L so there must be info on this somewhere. I've done a search and can't find anything. The car currently has 964 cams in it, as they are the hottest that can be used so as not to disturb the CIS fuel metering plate. Thanks.
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Bob Piper 78 911SC "Bullseye" SOLD 00 540i 02 CBR 954RR 98, 00, 03 sons |
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04-21-2004, 08:16 AM
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Okay, guess I'll answer my own question. After contacting Webcam (909)369-5144 I have learned that their 2021 is about the hottest that can be used even when CIS is removed in favor of carbs or in my prospective case, the CIS-to-efi kit. The next step up is the 993 supersport cam but they were not sure it would work without trying it and measuring the valve to piston clearance. The 2021s have a great reputation from what I've read on this board.
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Bob Piper 78 911SC "Bullseye" SOLD 00 540i 02 CBR 954RR 98, 00, 03 sons |
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04-21-2004, 10:24 AM
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drag racing the short bus
Join Date: May 2002
Location: Location, Location...
Posts: 21,983
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No! Wait! Let me answer! Let me! Umm...what's the question? Oh yeah: 20/21s from Webcam.
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The Terror of Tiny Town |
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04-21-2004, 10:34 AM
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smarta$$!!
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Bob Piper 78 911SC "Bullseye" SOLD 00 540i 02 CBR 954RR 98, 00, 03 sons |
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04-21-2004, 10:39 AM
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drag racing the short bus
Join Date: May 2002
Location: Location, Location...
Posts: 21,983
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Quote:
 Whatcha' planning to do with the motor?
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The Terror of Tiny Town |
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04-21-2004, 10:40 AM
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Location: Seattle- Eastside
Posts: 380
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Drive it. No track with this car, until the boys turn 16 and we turn it into a race car! I really don't need more HP but we all know how that works.
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Bob Piper 78 911SC "Bullseye" SOLD 00 540i 02 CBR 954RR 98, 00, 03 sons |
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04-21-2004, 10:44 AM
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I have the webcams in my 3.0 and love my engine! But, my engine has other mods, so I don't know how much I can attribute to the webcams.
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74 Targa 3.0, 89 Carrera, 04 Cayenne Turbo http://www.pelicanparts.com/gallery/fintstone/ "The problem with socialism is that you eventually run out of other people's money" Some are born free. Some have freedom thrust upon them. Others simply surrender |
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04-21-2004, 11:51 AM
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1974 Porsche 911 3.0
Yellow 911
