Is there a diff between EFI and CARB. cams?
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Junior User
Joined: Oct 2003
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From: MIAMI FL
Is there a diff between EFI and CARB. cams?
I just read the posts on 351 cefi to carb conversion. I remember way back when I had a 65 stang. Blew the 289, put in a 302 that was fuel injected before, everything bolted up and seemed ok, but did not run well. I don't have the car or motor anymore, but at the time I was told the 'efi cam' was to blame. Is this true? Just for craps and giggles. Thanks, J. Malone
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There are differences obviously they are listed seperately but your vehicle should of ran fine with the efi cam and carb however the other way around might create a problem or two only if the lobe seperation was lower. Usually efi cams in stock efi engines need a 112-114 lobe seperation or the idle gets weird and the computer cannot keep up. A carbed cam with the same lift and duration might have a lobe seperation of 110 so a stock efi would not know how to handle it and idle would suffer. So to answer your question yes and no. An efi motor should run fine with a carb with a proper tune the cam specs aren't special and the engine only cares if it gets fed the right amount of fuel and air, carbed to efi you might have problems with a non stock cam. Later
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A cam change in a speed density controlled EFI engine can create some difficulties, however MAF controlled EFI engines are extremely tolerant of dramatic cam changes. As an example, I have a 351W with a really big comp solid roller cam (292R), Victor 5.8 manifold, 90mm throttle body, 95mm MAF for a lightning truck, ported TFS track heat heads and dual 3.5" exhaust. This unit also deletes all of the polution equipment and runs using a stock A9L computer for a '90 5.0 Mustang. Now, I have a tweecer to tune the engine, but it will start and run fine with just the stock parameters as I found out by accident one night.
-Matthew
-Matthew
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Joined: Apr 2003
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From: NB, Canada
When I installed the carb on the 88 351w I found the engine sluggish until I redid curve in the distributor. I used the Mr. Gasket kit 925D recommended in the FORDMUSCLE site. There is a great article there on ignition timing you might find helpful. Through some friends here I found this site so I'm glad to pass it on. Hope it helps.
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