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Re: My engine likes too much timing, what to do?
[Re: MR_P_BODY]
#2089907
06/11/16 12:09 AM
06/11/16 12:09 AM
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Joined: Jun 2010
Posts: 591 Champion City
The Sphinx
OP
mopar
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OP
mopar
Joined: Jun 2010
Posts: 591
Champion City
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4 degrees got you 3/10ths & 4mph? You sure your not running crazy lean? Spark plug says no This is JMO.. but you have 2 problems..the wires are backwards and your light isnt working well with the MDS Once I get through a couple graduation parties, im going to swap the wires and get me a new timing light
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Re: My engine likes too much timing, what to do?
[Re: The Sphinx]
#2089947
06/11/16 01:04 AM
06/11/16 01:04 AM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
master
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master
Joined: Jan 2005
Posts: 2,540
Milwaukee WI
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Still very fuzzy on the explanation, but I agree totally with dial back timing lights and msd boxes. The (M)ultiple (S)park (D)ischarge stops happening at about the rpm that you are checking it (3000rpm) Depending on the inductive circuitry in the timing light, this may be why you are seeing unusual readings. Try going to 4000rpm and see what your light tells you. At 4000 you should only be getting one spark per cycle and that may make life on your timing light easier.
"use it 'till it breaks, replace as needed"
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Re: My engine likes too much timing, what to do?
[Re: Monte_Smith]
#2089956
06/11/16 01:23 AM
06/11/16 01:23 AM
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Joined: Oct 2007
Posts: 3,978 Hilltown Pa
1967dartgt
master
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master
Joined: Oct 2007
Posts: 3,978
Hilltown Pa
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Probably not a popular opinion......BUT, if your motor won't run without what is considered extremely large amounts of spark lead, something in the combo is grossly inefficient.
Don't care whos motor made what, with how much timing. When there are motors with good heads and the right cam profile that make best power at around 30*......if yours needs 40*, it's NOT an efficient motor. If you have an inherently inefficient head design, there ARE cam profiles to help it.
And NO, timing is not just a number. It's a relative gauge of the engines efficiency.
In the OPs case......he has a 60s or 70s at best camshaft profile, with a modern head. Of course it's not an ideal combo So I guess he should rebuild his combo instead of running more timing, makes sense... Lol If the motor needs more timing to make peak power run it there, that's what this combo of parts wants, I don't care if it not the most efficient it's what the person has.
Brett Miller W9 cnc'd heads STR Chassis fabraction
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Re: My engine likes too much timing, what to do?
[Re: The Sphinx]
#2089990
06/11/16 02:44 AM
06/11/16 02:44 AM
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Joined: Nov 2004
Posts: 6,890 North Alabama
Monte_Smith
master
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master
Joined: Nov 2004
Posts: 6,890
North Alabama
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It doesn't matter what he does.........the POINT was, if it needs that much timing to run, it's a bad combo. If he is good with it fine, but a cam change might make a world of difference and it make a lot MORE power. Guys change parts all the time. Maybe he doesn't KNOW that if it needs that much timing, it's not very efficient..........Now he does and might want to change something.......or maybe not. Why does it hurt to point it out. He seems perplexed it needs this much......well here is why
Last edited by Monte_Smith; 06/11/16 02:44 AM.
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Re: My engine likes too much timing, what to do?
[Re: Monte_Smith]
#2090014
06/11/16 05:18 AM
06/11/16 05:18 AM
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Joined: Jan 2003
Posts: 20,173 Park Forest, IL
slantzilla
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 20,173
Park Forest, IL
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Just asking, but are you driving it back to the pits before you pull the plugs? Won't that just show what it's doing on the idle circuit?
"Everybody funny, now you funny too."
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Re: My engine likes too much timing, what to do?
[Re: slantzilla]
#2090912
06/12/16 10:56 PM
06/12/16 10:56 PM
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Joined: Sep 2004
Posts: 2,091 oberlin, Ohio
Rapid340
top fuel
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top fuel
Joined: Sep 2004
Posts: 2,091
oberlin, Ohio
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The reluctor may be of poor quality (or vibration related ignition firing scatter) such that most or all other cylinders are firing late.
If you have a damper with marks all the way around (or 360 degree timing tape) you can see how all the other cyliders compare. If not, at least look at #6 and see how it compares to #1. Number 1 and 6 line up at same point on damper since #6 is half way thru firing order.
1971 Factory Appearing Duster 340 11.000 @ 122 mph
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