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Old 11-15-2002, 08:14   #1 (permalink)
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3.9 head

Just out of interest, Im getting a 3.9 EA rebuilt with extensive mods; stronger valve springs, bronze guides, larger valves and major port work. [Gulp!] After the change over the other head is for sale...... every part 8000 kms old.
Then found this bloke who designed a cam with a slightly shorter duration and a bit more lift than the Crow stage 2 cam. The theory being that the valve opens and closes quicker, and the duration is not so long as to give a rough idle or trouble the computor. Anyway, I think Im his second guinie pig.
Anyone have any opinions on the Crow cam as the news Ive heard isnt too flash.
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Old 11-15-2002, 21:17   #2 (permalink)
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I've heard mixed reports too. However, I think Thanatos has a Crow cam and his car is probably the quickest EA in the club...
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Old 11-16-2002, 02:56   #3 (permalink)
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firstly i would say that the massive port work and larger valves are going to trouble the computer in itself so i wouldnt be worrying now about the cam. ive just read an article about someone designing a cam for the ea and the best profile they could get with no computer problems was 195deg duration at .050 and .490though lift 264deg duration advertised. the computer runs into problems when it reaches below 16-17 inches vaccum at idle. standard is around 19-20 so you dont have much room to play with.
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Old 11-16-2002, 03:52   #4 (permalink)
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Is it true that they cannot get the CFI EA's to idle properly with a different profile cam? I dont see a cam with a grind similar to the XR6 cam causing too many dramas as they are fairly mild.
I would love to fit a decent cam to my CFI
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Old 11-16-2002, 04:22   #5 (permalink)
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well when we rang crow about a cam for a cfi they told us not to bother as the cfi's do not like having a modified cam
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Old 11-16-2002, 05:33   #6 (permalink)
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well when we rang crow about a cam for a cfi they told us not to bother as the cfi's do not like having a modified cam
The Question is, why would you bother putting a Crow Cam into a CFI motor?
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Old 11-16-2002, 06:52   #7 (permalink)
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what about a mpefi 4.0 in my ed using eec-4
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Old 11-16-2002, 15:34   #8 (permalink)
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Quote:
Originally posted by donuts2001
The Question is, why would you bother putting a Crow Cam into a CFI motor?
Why not?

I dont see any point at present in converting to MPFI when my car runs fine the way it is...just curious with cam choices for future reference is all...get all of these people dogging the CFI engines but theyre really not a bad donk at all...I know mine spins quite easily off the line and thats with a half stuffed gearbox
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Old 11-16-2002, 17:37   #9 (permalink)
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Have you driven an MPI?
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Old 11-16-2002, 18:53   #10 (permalink)
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Cant say that I have been behind the wheel of one no - but have certainly been in a few before.
Also alot of people who have done the conversion say there isnt a great deal of difference
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