Re: 500" R/B Total Advance Timing
[Re: moparjohn]
#2564317
10/15/18 11:29 AM
10/15/18 11:29 AM
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Joined: Jan 2003
Posts: 14,539 So. Burlington, Vt.
fast68plymouth
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I Live Here
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What’s the timing light being used?
FWIW, I’ve never dynoed anything where the best power was made at 28* timing.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 500" R/B Total Advance Timing
[Re: moparjohn]
#2564348
10/15/18 12:18 PM
10/15/18 12:18 PM
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Joined: Oct 2007
Posts: 4,219 New York
polyspheric
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New York
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High VE means higher cylinder pressure: less spark
Boffin Emeritus
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Re: 500" R/B Total Advance Timing
[Re: moparjohn]
#2564377
10/15/18 01:19 PM
10/15/18 01:19 PM
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Joined: Mar 2003
Posts: 1,455 N.W. INDIANA
moparjohn
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OP
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N.W. INDIANA
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Here are some more pictures of the #1 and #2 spark plugs. The first 2 are #1 and the last 2 are #2. The one turned out real well and should help analyze. MJ
Last edited by moparjohn; 10/15/18 01:20 PM.
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Re: 500" R/B Total Advance Timing
[Re: moparjohn]
#2564395
10/15/18 02:04 PM
10/15/18 02:04 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
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I Live Here
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What plug n heat range...........looks rich, wet and unhappy........
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: 500" R/B Total Advance Timing
[Re: moparjohn]
#2564416
10/15/18 02:45 PM
10/15/18 02:45 PM
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Joined: Jan 2003
Posts: 14,539 So. Burlington, Vt.
fast68plymouth
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Dial-back timing lights...... I don’t trust them.
The first thing I’d do is get a light without the dial-back feature and redo the test at the track.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 500" R/B Total Advance Timing
[Re: moparjohn]
#2564606
10/15/18 09:48 PM
10/15/18 09:48 PM
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Joined: Jan 2003
Posts: 19,544 Las Vegas
Al_Alguire
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Those plugs look quite unhappy....First how many passes are on them? What plug is it?
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: 500" R/B Total Advance Timing
[Re: fast68plymouth]
#2564630
10/15/18 10:49 PM
10/15/18 10:49 PM
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Joined: Feb 2005
Posts: 4,333 Prospect, PA
BSB67
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Dial-back timing lights...... I don’t trust them.
The first thing I’d do is get a light without the dial-back feature and redo the test at the track. I thought I was the only one that felt this way. Only used two dial-backs, and they were both incorrect. I'm still using my 45 year old Sears non dialback timing light.
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Re: 500" R/B Total Advance Timing
[Re: moparjohn]
#2564701
10/16/18 01:33 AM
10/16/18 01:33 AM
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Joined: Sep 2015
Posts: 1,096 Australia
ozymaxwedge
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Those plugs in the pics have short straps, mine are NGK BCP7ES have straps that are over the electrode. Any benefit from a short strap ?
1963 Plymouth Max Wedge 1971 Barracuda
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Re: 500" R/B Total Advance Timing
[Re: ozymaxwedge]
#2564726
10/16/18 04:47 AM
10/16/18 04:47 AM
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Joined: Aug 2003
Posts: 43,744 Bend,OR USA
Cab_Burge
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I Win
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Bend,OR USA
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Those plugs in the pics have short straps, mine are NGK BCP7ES have straps that are over the electrode. Any benefit from a short strap ? The exposed gap into the combustion chamber is usually a small benefit for race motors, especially if your close to the piston tops with the plugs Try them and see if you like them
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 500" R/B Total Advance Timing
[Re: moparjohn]
#2564841
10/16/18 02:35 PM
10/16/18 02:35 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
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I Live Here
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The plugs have no more than 20 passes on them. I have attached a picture of a new box of plugs. They are Champion product number 297 plug number C61CX. The heat range is the 61 in the part number. I hope this helps? MJ Lawn mower plugs...........
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: 500" R/B Total Advance Timing
[Re: moparjohn]
#2564854
10/16/18 02:50 PM
10/16/18 02:50 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
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Nothing wrong with that plug. I use champions and that's all I use unless the customer has some weird aversion to them.
That 61 is a fairly cold plug, yet those look hot. Unless you are at sea level and 15:1 that plug should be the correct range. You can try the 59 but I'm not sure what's going on.
You got a ton of fuel moving through the engine, no timing and plug that looks hot. Something is weird.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: 500" R/B Total Advance Timing
[Re: moparjohn]
#2564862
10/16/18 02:58 PM
10/16/18 02:58 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
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I just skimmed back through the thread and you are at 12:1 so that plug SHOULD be too cold. I would have started with a 284/C65YC or if you don't want the extended tip you can use the 285/C65C and tune from there.
So I've switched horses mid stream. I'm going to say get a hotter plug, verify TDC and your timing light and tune from there.
As AndyF said your plugs look bad. Sometimes looking at pictures isn't the same as looking in real life.
If there is no reason you can't run an extended tip plug, I'd use the extended tip.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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