 type 4 engine cam question |
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| john maples |
 Jun 21 2014, 02:23 PM
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#1
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Newbie  Group: Members Posts: 5 Joined: 4-June 13 From: Hunt, TX Member No.: 15,965 Region Association: None  |
Hi,
I was wondering what the effect would be when running FI on an engine with a carb cam? Any ideas? Thanks, John |
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| colingreene |
Jun 21 2014, 03:06 PM
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#2
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Senior Member Group: Members Posts: 729 Joined: 17-October 13 From: Southern California Member No.: 16,526 Region Association: Southern California |
Depends on the type of fuel injection,
If its the stock fuel injection it will not run well if at all. Aftermarket stuff if programed correctly it will run fine. |
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| jmill |
Jun 21 2014, 03:08 PM
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#3
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Green Hornet Group: Members Posts: 2,449 Joined: 9-May 08 From: Racine, Wisconsin Member No.: 9,038 Region Association: Upper MidWest |
I'm far from a FI expert but carb cams usually have significant valve overlap. With stock FI and a carb cam, I would think you would run the risk of over scavenging.
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| Jake Raby |
Jun 21 2014, 03:42 PM
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#4
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
According to the camshaft profile, it may not idle at all and low speed performance will suck.. EFI and camshaft profiles are fine lines.
What cam is it? |
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| john maples |
Jun 21 2014, 05:25 PM
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#5
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Newbie Group: Members Posts: 5 Joined: 4-June 13 From: Hunt, TX Member No.: 15,965 Region Association: None |
I don't know which cam is in the motor. Just thought about buying it as a temp while mine (912E) is being overhauled/ upgraded to 2056 specs.
QUOTE(Jake Raby @ Jun 21 2014, 01:42 PM)  According to the camshaft profile, it may not idle at all and low speed performance will suck.. EFI and camshaft profiles are fine lines. What cam is it? |
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| Mark Henry |
Jun 21 2014, 08:44 PM
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#6
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
With stock injection I'd have to say no to that.
Even programmable FI has issues with performance carb cams, although there is work arounds. Carb performance cams have lousy vacuum for the MAP or MPS, really you need at least 15 inches of idle vacuum. |
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