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Post by MrMopar on Mar 30, 2004 16:54:57 GMT -5
I think I finally got my carb set right so now it isn't too rich at idle and the A/F guage is reading in the ideal range. Now this "shake " problem that I am talking about has been ongoing for quite some time. By shake I mean that it isn't a steady lope as the cam would dictate but it is an inconsistant shake at idle. It is so bad at times that I can't get the screwdriver on the idle adjustment screws till it settles down a bit. Would an out of phase distributor cause this? Timing is at 16* initial and idle speed is 850 rpm. Cam is XE268H with 224/230 @.050. Carb is Holley 3310 750 vac sec. Engine is 340 bored .030 with 9.8:1 comp LD340 intake and J heads with 2.02 intakes and slightly ported. I am using NGK GR4 plugs.
HELP!!
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Post by rumblefish360 on Apr 1, 2004 20:43:19 GMT -5
Is the engine balanced?
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Post by MrMopar on Apr 1, 2004 22:01:39 GMT -5
Yes, it is, and I found out what was causing the shake. Seems as when I converted my 3310 to use a secondary metering block with replaceable jets, the metering block does not have an adequate idle feed supply. By this I mean that the metering plate has a series of channels that allow some fuel to be drawn into the secondary bores through a transfer slot, something similar to the primary idle system, only it is not adjustable. The metering block does not have an air bleed to allow the secondary idle to flow causing a lean condition as opposed to a rich condition that I thought I was having. I re-installed the metering plate and the car runs fine now, no shake and the A/F guage reads right on "ideal". I happened to run across this as I researched the theory of operation in the Holley Performance tuning book that I have. I would have thought that the conversion kit would work fine but in this case it does not. For a street machine it is unacceptable, for a strip car you wouldn't be too worried about it as you would be on the throttle all the time. The secondary idle is used to ensure that a fresh supply of fuel is always available in the secondary float bowl or you may have a situation where the fuel may never be emptied (never in my case cause my foots always in it) and become stagnant. This is according to the Holley manufacturers. Good thing I had the book, cause nobody seems to have known what was wrong.
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Post by rumblefish360 on Apr 2, 2004 16:49:21 GMT -5
Welll then, give yourself a pat on the back for being smart enuff to do what most have given up on, reading a book to find an answer!
Glad your all smoothed out.
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