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Join Date: Dec 2008
Posts: 4
Question Keep MFI Alive, or Repalce Ehngine with 3.0?

In a 1972-1973 2.4 MFI car, should I just try to keep the MFI alive, OR swap to CIS, swap the engine for a 1973.5 2.4 with CIS, swap to some aftermarket injection, or swap to an 911SC 3.0? Car is principally used for vintage rallies, so the 3.0 may not pass muster at times, correct? Does it matter if the MFI is from a T or S?


Old 05-22-2009, 12:56 PM
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kenikh's Avatar
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,732
You don't want to swap in CIS, especially onto a motor not designed for it. If the motor is solid, but the MFI is clapped out, repair is a bit expensive for the FI, so I'd pull it, stash it and drop on some Webers until I can afford the rebuild costs. Rebuilding MFI costs double to triple a set of good Webers.

- 1965 911
- 1969 911S
- 1980 911SC Targa
- 1979 930
Old 05-22-2009, 01:08 PM
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Join Date: Oct 2001
Location: Westford, MA USA
Posts: 8,642
Definitely keep the MFI alive. The biggest wear item on the MFI are the throttle-bodies, and they are not that more more expensive to get refurbished then a set of tired webers. What sort of condition is the MFI in? Often just tuning it up correctly will make a huge improvement.

'69 911E

"It's a poor craftsman who blames their tools" -- Unknown
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Old 05-22-2009, 02:50 PM
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