Re: engine guy question about 383
[Re: 3wracing]
#1648511
07/20/14 10:52 AM
07/20/14 10:52 AM
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Joined: Feb 2005
Posts: 4,321 Prospect, PA
BSB67
master
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master
Joined: Feb 2005
Posts: 4,321
Prospect, PA
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Quote:
checked the compression on my #s 69 roadrunner. compression #s warm were 148 to 159.Is this in tolerance? The motor is stock never out of the car.The stock heat riser is still on the car.Oil preessure is fine doesnt smoke runs and drives like it should.The only problem is when you rev the motor up the rpms are slow to come back down . I am getting ready to pull motor to do engine bay and would like to address any problems at that time i do not want to hurt #s motor any help ? thanks
Compression is fine.
The problem is likely not in the motor.
Give more detail on exactly what it is doing
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Re: engine guy question about 383
[Re: 3wracing]
#1648514
07/20/14 03:23 PM
07/20/14 03:23 PM
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Joined: Oct 2003
Posts: 4,013 South Park, Pa.
68LAR
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South Park, Pa.
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If it's a completely stock 383, 10" is too low. You should be around 12" or a little higher. If the idle doesn't settle after higher rpms, you may have a vacuum leak somewhere or the carb throttle blades are hanging up. Next time you try it, try taping side to side with a very small hammer, on the carb throttle shaft(primary side),just to see if the idle drops back to normal. If it does then you know it's the carb, if it doesn't, then you know it's a vacuum leak or maybe timing. With 10", I'm leaning toward a vacuum leak, or retarded timing. 0* @TDC, with a stick car is normal with the vacuum line off of the distributor.
4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight
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Re: engine guy question about 383
[Re: 3wracing]
#1648515
07/20/14 05:34 PM
07/20/14 05:34 PM
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Joined: Mar 2003
Posts: 4,848 Memphis
HemiRick
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Memphis
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Vacuum will be low at TDC timing as it should be about 10 degrees Before TDC, advance the timing some and the vacuum will come up to where it should be.....
Take care, Rick 68 Coronet R/T 440 & 68 Charger 528 Hemi,and 5 Challengers! 6 cyl, 318, 360, 383, 451
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Re: engine guy question about 383
[Re: ademon]
#1648518
07/20/14 06:42 PM
07/20/14 06:42 PM
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Joined: Oct 2003
Posts: 4,013 South Park, Pa.
68LAR
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master
Joined: Oct 2003
Posts: 4,013
South Park, Pa.
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I forgot about the dashpot. Back in 68 & 69 stick car timing was TDC. Auto's were 2* BTC for 383's.
4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight
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Re: engine guy question about 383
[Re: 68LAR]
#1648519
07/20/14 08:09 PM
07/20/14 08:09 PM
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Joined: Jan 2005
Posts: 495 northeast pa
3wracing
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Posts: 495
northeast pa
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this is the carb on my 69. Sorry its dark its an n96 car also
Last edited by 3wracing; 07/20/14 08:14 PM.
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Re: engine guy question about 383
[Re: johnedod]
#1648522
07/20/14 11:22 PM
07/20/14 11:22 PM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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I could be wrong but from what I remember dashpots were mostly only on auto trans cars. They were used to help catch the idle on auto cars so if you let off the gas real quick in gear it would bring the idle down slow so it would not stall. But I only remember them on auto cars as stick cars did not really need them. But it looks like your carb in the picture has the dashpot on it. Ron
Last edited by 383man; 07/20/14 11:26 PM.
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Re: engine guy question about 383
[Re: 3wracing]
#1648526
07/21/14 08:58 PM
07/21/14 08:58 PM
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Joined: Jun 2012
Posts: 1,386 Philadelphia PA
Pynzo
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Drugs are bad
Joined: Jun 2012
Posts: 1,386
Philadelphia PA
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Carter 4615S is the stock carb for '69 383 manuals and will have the dashpot. It does slow the return to idle from 2000+RPM. Keeps the vacuum advance raised while dropping throttle while speed shifting, reducing emissions. 4426S for '68 carb and it too will have the dashpot. http://www.tocmp.com/manuals/Carbs/Carter/Chrysler/1965-1979/pdf/Chrysler121-173.pdfScroll down to Form 5526C for '68 AVS parts list and Form 5534A for '69 parts list. There is a difference in primary rods and secondary jets.
Last edited by Pynzo; 07/21/14 09:17 PM.
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