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3 restos WIP = psycho
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,665
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Is there a difference in valve angle between 2.2 and 2.4 heads?
I am still trying to decide which motor to build, but the "Ultimate 2.0" is slowly edging ahead of the 2.8SS. It is details like this that will help me make the final decision.
It appears that knock sensitivity is improved by ditching the high domed 2.0 heads for 2.2 heads, even with twin plugs. The Rennsport site states that 2.2 heads work great on a 2.0, but what about 2.4 heads? They are built for the same bore, but is there a difference in valve angle? I believe they have differening head volumes, but if you are having JEs made, that shouldn't matter. It appears the flatter valve angle of the 2.2 is what makes them superior to the 2.0, but have yet to hear an assessment of the 2.2 vs. 2.4 heads in a 2.0 application. Thanks!
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- 1965 911 - 1969 911S - 1980 911SC Targa - 1979 930 |
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09-03-2005, 01:31 PM
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PRO Motorsports
Join Date: Nov 2001
Location: Burbank, CA
Posts: 4,580
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2.2, 2.4, and 2.7 heads are all basically the same. The 2.7 heads are angle cut for the larger bore, but the 3 are essentially identical as far as valve head diameter, angle and stem diameter. Port sizes vary by model, of course.
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'69 911E coupe' RSR clone-in-progress (retired 911-Spec racer) '72 911T Targa MFI 2.4E spec(Formerly "Scruffy") 2004 GT3 |
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09-03-2005, 03:35 PM
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