Re: 500" R/B Total Advance Timing
[Re: moparjohn]
#2563895
10/14/18 03:26 PM
10/14/18 03:26 PM
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Joined: Aug 2003
Posts: 43,228 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,228
Bend,OR USA
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Did you verify TDC on the dampener and timing tab? The reason I ask that is when we tested timing at the track or on a engine or chassis dyno all the RB we tested like from 34 to 36 max, the race cars would slow down in the 1/4 with 38 or 32 degrees total That was a long time ago with stock stroke iron headed bracket motors running in Super Street. We ran street hemi cars in NHRA stock and had the same results on both of those cars My last pump gas 518 C.I. BB with iron and aluminum heads seemed to like from 34 to 36 degree also
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: GY3]
#2563918
10/14/18 04:04 PM
10/14/18 04:04 PM
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Joined: Mar 2003
Posts: 1,453 N.W. INDIANA
moparjohn
OP
pro stock
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OP
pro stock
Joined: Mar 2003
Posts: 1,453
N.W. INDIANA
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Thanks for the replies! Here is some added info: Yes, The TDC of the piston and timing mark was verified. The pistons are flat tops with Indy SR heads Max Wedge type intake ports. Running 110 race fuel and compression is 12 to 1. MJ
Last edited by moparjohn; 10/14/18 04:05 PM.
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Re: 500" R/B Total Advance Timing
[Re: moparjohn]
#2563936
10/14/18 04:36 PM
10/14/18 04:36 PM
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Joined: Feb 2003
Posts: 2,810 Sobieski Wi
bee1971
master
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master
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Posts: 2,810
Sobieski Wi
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My Little 383/432 Stroker
Edelbrock E Street 75cc
10.5-1 True Compression
200 # Cranking Compression On All Eight
Comp Cams XE275HL
Loves 15 Initial - 18 Mechanical - 33 Degrees Total 91 Octane No Ethanol
1971 Dodge Charger Superbee 2011 Ram Sport 1500 Quad Cab Deep Water Blue Loaded Siberian Huskies
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Re: 500" R/B Total Advance Timing
[Re: moparjohn]
#2564035
10/14/18 08:25 PM
10/14/18 08:25 PM
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Joined: Mar 2003
Posts: 2,514 PA
moparacer
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A lot of factors go into total timing. So much that you really can't go off of anyone else's setup. AF ratio, spark plug heat range, altitude you are running at, RPM range, piston type, cylinder head and combustion chamber efficiency, and on and on and on.
I have a 500 B on alky with 13.3 compression and domes that doesn't like any less than 38 degrees total. And the domes make it want more timing from my experiences and I have ran similar setups with flat tops that want lower total, maybe not like you are seeing but in the lower 30s anyway.. If she wants to run at 28, I would run her at 28!
Last edited by moparacer; 10/14/18 08:26 PM.
67 Barracuda street/bracket car 11.27-119 68 Dart 502 BB 8.70s-152 414 cid SB Dragster 7.65-174
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Re: 500" R/B Total Advance Timing
[Re: moparjohn]
#2564046
10/14/18 08:39 PM
10/14/18 08:39 PM
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Joined: Mar 2006
Posts: 2,675 Mt. Eden Ky.
Hemi Allstate
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master
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Mt. Eden Ky.
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FWIW my 470" low deck picked up power on the dyno when we backed it down to 32* from 34*. I haven't put it in the car .
Mark
1996 Ram 1500 Sport 1968 road runner 1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019
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Re: 500" R/B Total Advance Timing
[Re: moparjohn]
#2564052
10/14/18 08:48 PM
10/14/18 08:48 PM
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Joined: Jan 2003
Posts: 12,160 Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,160
Benton, IL.
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My 500" wedge always liked 34*. I ran several different cams in the 245* to 255* range.
Master, again and still
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Re: 500" R/B Total Advance Timing
[Re: moparjohn]
#2564086
10/14/18 09:54 PM
10/14/18 09:54 PM
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Joined: Feb 2003
Posts: 2,810 Sobieski Wi
bee1971
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master
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Sobieski Wi
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Can’t see the timing marks on the ground electrodes with those fuzzy pictures
But it’s running rich
1971 Dodge Charger Superbee 2011 Ram Sport 1500 Quad Cab Deep Water Blue Loaded Siberian Huskies
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Re: 500" R/B Total Advance Timing
[Re: bee1971]
#2564128
10/14/18 10:44 PM
10/14/18 10:44 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
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master
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Washington
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Can’t see the timing marks on the ground electrodes with those fuzzy pictures
But it’s running rich It's rich and the plug looks hot. That's why it likes less timing. He is pulling timing to keep the plug from overheating, rather than let the plug function like it was designed. I've seen that my entire life.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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