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cabobbyd
Join Date: Mar 2008
Location: California
Posts: 1
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2.4 CIS Rebuild Options
Looking for some advice on rebuild options for a '73-1/2 2.4 CIS engine. The car has been cosmetically changed to look more like a 74+ 911 so I'm not concerned with staying OEM with the engine, I'd just like more performance than the 140 HP the 2.4 CIS delivers. The engine options in "How to Rebuild and Modify your Porsche 911 Engine" don't address modifications to the 2.4 CIS engine and from what else I read, PMO carburetors and aftermarket Fuel Injection kits (ie- megasquirt) don't exist either for the 2.4 CIS. Any recommendations or personal experiences with 2.4 CIS modifications would be appreciated.....
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03-18-2009, 02:43 PM
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3 restos WIP = psycho
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,665
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That is one of the nicest short nose conversions I have seen.
You are actually incorrect in your research. PMOs are brain dead easy to add and the TBitz EFI system can be adapted just fine to a CIS 2.4T. 40mm PMOs will do the trick just fine, but TBitz is by far the coolest. Here's an even more involved conversion than yours - a 72T w/ MFI converted to Bitz EFI using CIS runners: http://www.bitzracing.com/gallery/James_72_911T_2_4.html
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- 1965 911 - 1969 911S - 1980 911SC Targa - 1979 930 Last edited by kenikh; 03-18-2009 at 03:53 PM.. |
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03-18-2009, 03:51 PM
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3 restos WIP = psycho
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,665
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Instructions so you can get knee deep:
http://www.bitzracing.com/docs/CIS_to_EFI_manual.pdf
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- 1965 911 - 1969 911S - 1980 911SC Targa - 1979 930 |
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03-18-2009, 03:55 PM
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3 restos WIP = psycho
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,665
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The answer to your specific question:
-Will the kit work for a 2.4L engine? The problem with the 2.4L engine is that the CIS injectors are mounted directly into the intake head. The CIS to EFI bungs which are key to the conversion will not fit in the heads. They are designed to fit in the intake manifold. One fellow is trying to do the conversion on a 2.4L by making an adapter plate to fit between the 2.4L heads and use a later year intake manifold that has the injectors on the intake runners. Have a look here to see if your intake is the correct type. Making spacers (or having them made) is easy and not very expensive - there are vendors already selling them for MFI, so you can just order them with CIS injector bungs. They look something like this:  I also believe you could source later runners and just block of your injector ports in the heads with properly sizerd bolts. They are cheap.
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- 1965 911 - 1969 911S - 1980 911SC Targa - 1979 930 Last edited by kenikh; 03-18-2009 at 04:01 PM.. |
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03-18-2009, 03:59 PM
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