30* Timing?
#3226382
04/10/24 10:51 PM
04/10/24 10:51 PM
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Joined: Mar 2008
Posts: 553 Kentucky
clovis
OP
mopar
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OP
mopar
Joined: Mar 2008
Posts: 553
Kentucky
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Well I finally got my little 383 together and in the car. I have had it out for 2 test and tunes and it seems to like 30* of timing. The first test and tune I had it on 34* and it MPH around 120, good but I was expecting better. I had to pull the distributor to re-prime the oil after the check valve failed (external oiling), and didn’t check the timing before heading out to the 2nd test and tune. Once at the track, it picked up 3 mph, now provided it was a near perfect day 60 degrees 35% humidity, and I had jetted it up from the first session. After the 3rd pass I decided to pull some more timing because the plugs seem to indicate it still had too much, set it at 28* it slowed down. Went back to 30* for the last pass and it was back to 10.85 at 123ish. I know the Edelbrock head is a much better head than my 906 but I was not expecting 10* difference as my 906’s liked right at 40*.
I was also curious if a different octane gas would be a factor . I normally run 90 pure gas but the station I get it from changed hands and now it is only 87. I am only at 9.5 static compression, 7.95 dynamic , since I am having to run a .066 gasket because of the being .007 out of the hole and aluminum rods.
'75 Plymouth Duster Phase I 451 906/590/2-660 10.75/126 Phase II 451 Stage VI/590/1050 9.82/135 Phase III 383 906/Victor-Pump gas 11.30/119
"For by grace you have been saved through faith. And this is not your own doing; it is the gift of God,"
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Re: 30* Timing?
[Re: clovis]
#3226393
04/11/24 12:27 AM
04/11/24 12:27 AM
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Joined: Aug 2003
Posts: 43,223 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,223
Bend,OR USA
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What brand and heat range plugs? Most of the B/RB motors I've play with like from 34 to 36 degrees total timing with good near optimum tune Did you verify the TDC on the balancer and the timing cover? If not do that next
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 30* Timing?
[Re: Cab_Burge]
#3226413
04/11/24 06:37 AM
04/11/24 06:37 AM
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Joined: Mar 2008
Posts: 553 Kentucky
clovis
OP
mopar
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OP
mopar
Joined: Mar 2008
Posts: 553
Kentucky
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Currently I am using the NGK 6987, which is a 6 heat range. I started with the Autolite 3924, but I went through my stash testing carburetors and starting using the NGK's I had on hand.
I was having some issues with the timing gear that came with the engine because it appeared the engine has been line bored, so when I went to the short chain, I checked TDC again. However, now that I think about it I did not go back and check my cam timing.
'75 Plymouth Duster Phase I 451 906/590/2-660 10.75/126 Phase II 451 Stage VI/590/1050 9.82/135 Phase III 383 906/Victor-Pump gas 11.30/119
"For by grace you have been saved through faith. And this is not your own doing; it is the gift of God,"
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Re: 30* Timing?
[Re: SportF]
#3226464
04/11/24 11:49 AM
04/11/24 11:49 AM
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Joined: Jan 2003
Posts: 13,369 Marion, South Carolina [><]
an8sec70cuda
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I Live Here
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Marion, South Carolina [><]
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If you are saying that total timing, all in at say 3K, and it runs best at 30 degrees. That probably isn't correct and your damper or something isn't right.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: 30* Timing?
[Re: an8sec70cuda]
#3226470
04/11/24 12:10 PM
04/11/24 12:10 PM
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Joined: Jan 2003
Posts: 1,607 westerly, ri. usa
440lebaron
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,607
westerly, ri. usa
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my quickest times were 38* started at 32*, (locked out) (93 octane with booster) 383 stock compression steel shim head gasket .484 purple shaft T/Q carb, stock cast iron intake
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Last edited by 440lebaron; 04/11/24 12:12 PM.
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Re: 30* Timing?
[Re: dvw]
#3226550
04/11/24 06:53 PM
04/11/24 06:53 PM
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Joined: Jan 2003
Posts: 10,010 Frostbitefalls MN (Rocky&Bullw...
gregsdart
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I Live Here
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For your fuel, compression, cam and quench situation, the motor responded bestTO AN OBSERVED 30 degrees. So trust the time slip. But if you change fuel, or timing light, or cam timing, then you will need to retest the timing it wants. The next time you have it apart, recheck tdc marks and cam timing. That way you can be certain of the observed timing
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: 30* Timing?
[Re: SportF]
#3226568
04/11/24 08:28 PM
04/11/24 08:28 PM
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Joined: Jan 2003
Posts: 5,991 Anoka County, MN
Leigh
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master
Joined: Jan 2003
Posts: 5,991
Anoka County, MN
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I hear this 30-32 timing thing all the time on the internet, but that is NOT what happens at the track.
Next time at the track, walk around and ask what guys are running. I've never heard anybody running that low of timing. I actually think that some are convinced that if you run more than 34 degrees you can disrupt the time/space continuum and destroy the entire universe as we know it. That's a worse case scenario of course, the damage may be merely limited to our galaxy. Good luck what ever happens, but don't believe everything you hear (including this) I’ll be at Grove Creek May 25-26. Stop at my trailer, I’ll hand you the timing light. (The Holy Grail Sears 2134).
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Re: 30* Timing?
[Re: gregsdart]
#3226734
04/12/24 02:14 PM
04/12/24 02:14 PM
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Joined: Jan 2003
Posts: 13,369 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,369
Marion, South Carolina [><]
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For your fuel, compression, cam and quench situation, the motor responded bestTO AN OBSERVED 30 degrees. So trust the time slip. But if you change fuel, or timing light, or cam timing, then you will need to retest the timing it wants. The next time you have it apart, recheck tdc marks and cam timing. That way you can be certain of the observed timing By all means, run it where it likes it. The timeslip doesn't lie. I'm very surprised if that motor didn't want 36-40 degrees. Like said, something may be off giving you an inaccurate reading.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: 30* Timing?
[Re: an8sec70cuda]
#3226743
04/12/24 03:04 PM
04/12/24 03:04 PM
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Joined: Jan 2003
Posts: 19,372 Las Vegas
Al_Alguire
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I Live Here
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Las Vegas
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Like has been said run it where its happy. Could be alot of things but who cares if the plugs look good and its faster let it eat
"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: 30* Timing?
[Re: SportF]
#3226772
04/12/24 07:34 PM
04/12/24 07:34 PM
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Joined: Jan 2003
Posts: 5,991 Anoka County, MN
Leigh
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master
Joined: Jan 2003
Posts: 5,991
Anoka County, MN
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, that is the holy grail of time lights , same as mine. Sorry, I'll be in Eddyville. I'll see if I can't bump into to you somewhere this summer. Good luck. I’m planning on making Cedar Falls, Grove Creek and maybe Rock Falls. Good luck to you as well.
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Re: 30* Timing?
[Re: Leigh]
#3226773
04/12/24 07:49 PM
04/12/24 07:49 PM
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Joined: Aug 2011
Posts: 2,864 Pattison Texas
CSK
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Pattison Texas
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the thing with electronic ign is some they advance & some retard as the rpm goes up, you check the total @ 3k & its 30deg, but @ 6k it could be 34 degrees
Last edited by CSK; 04/12/24 07:54 PM.
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
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Re: 30* Timing?
[Re: CSK]
#3226828
04/13/24 08:46 AM
04/13/24 08:46 AM
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Joined: Mar 2008
Posts: 553 Kentucky
clovis
OP
mopar
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OP
mopar
Joined: Mar 2008
Posts: 553
Kentucky
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I was able to locate some 90 octane pure gas, so I am going to run that tonight. I think I am going to jet it down some, as when I cut the plugs it looks like it is rich now and it is suppose to be 15 degrees warmer today than last weekend. I am also thinking about going ahead and adding two degrees of timing. I am curious if the 87 octane is part of my problem, as when I went to shut if off last weekend it wanted to run on for just a second. I do have the timing locked out, my box will pull 20* when I start it. It will idle right around 1,200-1,300, so the run on may be a high idle and 87 octane. The engine itself by water temp was very cool, it was hard to get it to over 180* last weekend, so I want to say it is not running hot. When I have had run on in the past with the iron heads I was convinced it was hot because it was lean (water temp 200).
'75 Plymouth Duster Phase I 451 906/590/2-660 10.75/126 Phase II 451 Stage VI/590/1050 9.82/135 Phase III 383 906/Victor-Pump gas 11.30/119
"For by grace you have been saved through faith. And this is not your own doing; it is the gift of God,"
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