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Need info on odd fire and even fire 4.3 V6 ?

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Old 06-30-2002, 01:34 PM   #1
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Need info on odd fire and even fire 4.3 V6 ?

What changes were made to create the even fire VS the odd fire 4.3 V6?
What parts are interchangeable, if any?
I'm really looking for info on the crank, cam, and distributor.
Thanks.
Old 06-30-2002, 10:42 PM   #2
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Anyone?
Old 06-30-2002, 10:48 PM   #3
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http://home.golden.net/~appster/text.february.html
Old 06-30-2002, 11:10 PM   #4
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this should help, this info is all directly from the Chevrolet
Power catalog from GM

1978-84 v6/90 where 200 and 229 cid, these motors had a
"semi even" firing order with a rod throw of 132degrees/108deg/132deg/108deg and so fourth throughout the firing order of 1-6-5-4-3-2.


the 4.3 was introduced in 1985 and is a true "even fire " engine.
Its rod throws are offset 30 degrees which produce 120 deg. of crankshaft rotation between cylinder firings.

Then there is a heavy-duty "common pin" crankshaft that was developed by Chevy Special Products for v6/90 racing engines. There is NO offset in the rod journals of a common pin crank.
So this design produces an "odd fire" sequence with alternating
150deg and 90deg intervals between cylinder firings. NO PRODUCTION V6/90 CHEVROLETS HAVE BEEN MANUFACTURED WITH ODD-FIRE COMMING PIN CRANKSHAFTS, however most of the v6/90s used in COMPETITION are equipped with a common-pin
odd fire crank.

Thus there are three possible firing sequences for a v6/90 engine
as determined by the crank shaft. EACH FIRING SEQUENCE REQUIRES A SPECIFIC DISTRIBUTOR AND CAMSHAFT TO PRODUCE THE CORRECT SPARK AND VALVE TIMING FOR PROPER OPERATION.
The firing order is the same on all v6/90. 1-6-5-4-3-2
Old 07-02-2002, 12:02 PM   #5
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Thanks for the help!!
I really appreciate it.
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