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Join Date: Jan 2002
Location: Glyndon MD
Posts: 327
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2.4 to 2.7 - MFI Question
Thank you all for responses to my prior thread on machine work required on my 2.4 for installing 2.7 RS P&C.
The engine I have in mind, if it turns out to be a realistic possibility, is kind of a 2.7 RS/E, with E cams or similar and some kind of modified MFI cam but using as many of my existing parts as possible. I know all the 2.4s (and 2.7s?) have the same valve sizes. What I don't know (among many other things) is whether the 2.4T MFI throttle bodies will work in this application, assuming standard T/E port configuration. I don't need a real RS-spec engine. If this engine idea won't work, somebody please disabuse me and I'll bark up another tree. I also have a set of Webers.
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David Porter Glyndon MD '72 911T Targa |
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12-13-2002, 08:01 AM
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Stacks and throttle bodies (sized accordingly) and new space cam in the pump depending on your setup.
Personally, and while not cheap, I would consider the PMO setup as it's a bit less technical for the do-it-yourselfer. MFI is wonderful when it's working properly but a major pita if otherwise. I don't like complication. Good luck. Sounds like fun. |
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12-13-2002, 08:08 AM
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12-13-2002, 08:10 AM
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Location: Plymouth Ma USA
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The "T" throttles are much smaller and I've heard the bolt pattern is different also.
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Bruce |
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12-13-2002, 09:12 AM
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Bump. Need help here.
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David Porter Glyndon MD '72 911T Targa |
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12-13-2002, 12:12 PM
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On my car, I did not change the heads or the stacks. I took mfi to gus at PFI along with injectors and stacks. Injectors were still great after 20 yrs. He cleaned up stacks and said I did not need to rebuild them. I installed e cams with my setup. Took me about 6 months before I fully understood the mfi. My car has 50,000 miles on it and runs great. I have it running rich which it likes. I have never fouled a plug. I find this to be a great street and auto-x setup. The car is not that fast but, it's quick and pulls hard to 6000. Sometimes I wish I would have gone the 's' route. But, at the time I did not have the money. I know you mentioned going to a 3.2 motor. I would probably do that now if I had the chance.
I built the engine myself in my sisters basement with 2 books and some friends help. I had never built a porsche engine before. I did not do what should have done in regurds to what I have read on this board. But, it worked and I'm pretty proud that it has lasted this long. I beat my car! It may be old but, I can scare the crap out of people driving up mt tam in it. Have fun!!
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72 911 Although it is done at the moment, it will never be finished. |
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12-13-2002, 01:12 PM
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we decided to go MFI on our high compression high rpm 2.7 street motor we're building... we were gonna use a set of 46mm webers we had in teh basement, but a nice MFI setup off a 3.0L racecar came up...
My dads race engine builder said the MFI would give about the same power but would give us better idle and a few toher little things... in other words he says the mfi would b ebetter for street driving |
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12-13-2002, 01:17 PM
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