Help my doggy 383
#680155
04/25/10 08:30 PM
04/25/10 08:30 PM
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Joined: Feb 2003
Posts: 4,503 NJ
440challenger
OP
master
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OP
master
Joined: Feb 2003
Posts: 4,503
NJ
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Dont have all the specs but i bought this motor used about 6 years ago. It was rebuilt and runs great,but just feels underpowered.
I have had it in my roadrunner for about 3 years. Its a 383, SRP pistons?, mopar hydraulic purple shaft unknown lift/duration, 906 heads,eddy perf intake,Bigs 780 vac carb, headers. msd ignition,timing at 38 total.
Its an auto,2800 converter,4.11 gear. Car runs great, besides it feeling underpowered. it doesnt have the pull that puts you back in the seat. I just got done building a smog 440 with the a summit cam it it will destory this mild 383. Is this just the nature of a mild 383 with (im guessing) low compression?
Anything you guys reccomend doing/checking? thanks!
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Re: Help my doggy 383
[Re: 440challenger]
#680156
04/25/10 09:02 PM
04/25/10 09:02 PM
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Joined: Feb 2003
Posts: 10,294 Someplace you aren't
SomeCarGuy
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 10,294
Someplace you aren't
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If the engien really is runnign OK, then there is little you can do short of putting in a bigger cam and/or aftermarket heads. CR might be a bit low though for aluminum heads.
I would say look at things to lighten up the car, it will make it easier to get moving and might even help you out a bunch if you have manual steering. I know it sure made my 69 RR MUCH easier to live with when I was albe to cut some wieght with aluminum WP and housing, alng with a mini starter and ditching my iron intake. Aluminum master is next when the time comes.
Short of that, not much you can do. My RR had more grunt with the 440, but the 383 is fine for my use. Just will never have the pop the big engine did. Of course I get better MPG now...
I want my fair share
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Re: Help my doggy 383
[Re: SomeCarGuy]
#680158
04/25/10 09:09 PM
04/25/10 09:09 PM
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Joined: Feb 2003
Posts: 4,503 NJ
440challenger
OP
master
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OP
master
Joined: Feb 2003
Posts: 4,503
NJ
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I have alum master w/ maunual brakes. maunual steering. Alum rad. It cruizes good, Just it not fun to drive without that grunt. I dont know if im used to driving my challenger (low 11 sec street car) or if i can get more out of this 383 combo. Im going to check my inital timing tommrow and see where im at. I found a video on you tube that kind of shows how my motor acts. its not as slow as the one on youtube but it resembles the same traits as how it takes for ever to wind out and doesnt go anywhere http://www.youtube.com/watch?v=5g6M9daFPh4
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Re: Help my doggy 383
[Re: RapidRobert]
#680160
04/25/10 09:21 PM
04/25/10 09:21 PM
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Joined: Mar 2008
Posts: 5,746 Ontario, Canada
Dodgem
master
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master
Joined: Mar 2008
Posts: 5,746
Ontario, Canada
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Quote:
Quote:
Anything you guys reccomend doing/checking? thanks!
Get a baseline on what you have now: compression test/leakdown test/idle vacuum/initial timing/slot curve/mixture. I'd advance the cam 4 deg for a start to effect some gain that you can feel keeping in mind that it'll decrease the PV clearance on either the intake or the ex valves (not sure which).
at least 4 deg on a purple shaft maybe 6 will really wake it up.
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Re: Help my doggy 383
[Re: 440challenger]
#680163
04/25/10 09:47 PM
04/25/10 09:47 PM
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Joined: Oct 2007
Posts: 846 Illinois
moparmattkos
mopar addict
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mopar addict
Joined: Oct 2007
Posts: 846
Illinois
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Quote:
Car runs great, besides it feeling underpowered. it doesnt have the pull that puts you back in the seat. Anything you guys reccomend doing?
Hope this helps ,I have enclosed a pic of my last motor that felt underpowered! I just put a small nos kit on it and it woke up quite a bit!
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Re: Help my doggy 383
[Re: 440challenger]
#680166
04/25/10 10:07 PM
04/25/10 10:07 PM
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Joined: Feb 2003
Posts: 10,294 Someplace you aren't
SomeCarGuy
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 10,294
Someplace you aren't
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I used to run only Comp Cams chains, now I don;t know if I would use them based on the problems I see posted here with all of their current offerings I had a Roll Master set a couple of years ago that was really tight. Really tight. I would think it would hold up well. Sold the engien, so???
I want my fair share
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