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Re: Total timing
[Re: demons r us]
#2368435
09/10/17 07:54 PM
09/10/17 07:54 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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How fast should total timing be in on a 340 with 10-1 compression 500 lift cam That is most affected by combustion chamber design. What heads? If Mopar what casting number?
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Total timing
[Re: demons r us]
#2368451
09/10/17 08:27 PM
09/10/17 08:27 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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with open chambered heads I would go with 35/with closed chambered with quench or magnums with or without quench I would go 31. I would set the initial first with the vac gauge method then shorten the slots to get the total then work with springs then work with the can (if used). the FBO $22 plate is by far the best/easiest/cheapest way to alter the mech slot amount to get the total (initial+slots) that you want.
live every 24 hour block of time like it's your last day on earth
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Re: Total timing
[Re: demons r us]
#2368455
09/10/17 08:34 PM
09/10/17 08:34 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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closed chambered (I am assuming) & quench or no quench
live every 24 hour block of time like it's your last day on earth
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Re: Total timing
[Re: demons r us]
#2368498
09/10/17 09:49 PM
09/10/17 09:49 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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I would set the initial with the VG method then shorten the slots to get 31 then mix & match springs staying a bit under the pinging point at WOT up thru the gears on your hottest/driest (most likely to ping) day. I'm assuming the OE spring with the elongated loop has already been tossed & if not toss it & another lighter one subbed in, this is a good start & go lighter or heavier as needed & the slope is linear no matter what combo is in there (with the elongated loop spring out of there). then adj the can if used, same thing, staying a bit under the pinging point in everyday driving under varying load/RPM conditions. Bottom line NO pinging is permissable (you want to stay fairly close to that line but never over it). & you dont want the advance to start any less than 1-200 RPM above what the hot in gear idle speed is which is what it will be at stoplight to stoplight. All this will get you very close for a good start.
live every 24 hour block of time like it's your last day on earth
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