750 Edelbrock Problems
#308579
05/05/09 02:07 PM
05/05/09 02:07 PM
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Joined: Jun 2006
Posts: 5,161
CT
GTX MATT
OP
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OP
master
Joined: Jun 2006
Posts: 5,161
CT
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A buddy of mine bought a '68 Road Runner restored about a year ago. Its all factory and the 383 is supposed to be rebuilt to factory specs, the one incorrect thing on it is the original Carter AVS has been replaced with the 750 Edelbrock, I guess its the Thunder Series?
Anyway my buddy, Steve, is a pretty sharp tuner. Hes owned many cars over the years and they've all been pretty much stock but he spent hours tuning all of them and got them to really fly. This car is just a dog. It will get moving, and it could be worse, but it feels like its got a 383 2 barrel really. He can't figure out this engine out, mostly the Edelbrock carb and thinks its the problem. I mentioned to him that theres alot of complaints about them and told him Id see if I could find anything out.
Any tips for getting these things to work? Are they basically just junk, or can the problems be fixed with some work? He doesn't have money for a new carb, so hes trying to fix what he has.
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
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Re: 750 Edelbrock Problems
[Re: JohnRR]
#308583
05/05/09 03:59 PM
05/05/09 03:59 PM
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Anonymous
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Anonymous
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TOO MUCH fuel pressure and you have trouble with Edelbrock carbs--They say nothing over 5 1/2 lbs any everybody thinks of the old Holley 7 lb rule--They can't handle the extra pressure--causes all kinds of trouble--best place to start before you dig into the carb 
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Re: 750 Edelbrock Problems
[Re: deansrr]
#308585
05/05/09 08:22 PM
05/05/09 08:22 PM
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Anonymous
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Anonymous
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The 750 Eddy blows, pick another carb. 
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Re: 750 Edelbrock Problems
[Re: SomeCarGuy]
#308589
05/06/09 03:37 PM
05/06/09 03:37 PM
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Joined: Feb 2003
Posts: 12,675
Columbia, CT
moper
I Live Here
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I Live Here
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Posts: 12,675
Columbia, CT
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Matt, If you want to post a bit more detail about the engine (cam, intake, etc) I can help you with it. Like any carb, they all need tuning to be right. If someone bolts on a carb of any manufacturer and it's perfect out of the box, the owner doesn't know what really good is. If he needs it, worse comes to worse have him swing up to the farm. I'm finally HOME. 
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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Re: 750 Edelbrock Problems
[Re: SomeCarGuy]
#308590
05/06/09 04:36 PM
05/06/09 04:36 PM
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Joined: Jan 2003
Posts: 74,974
U.S.S.A.
JohnRR
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I Win
Joined: Jan 2003
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U.S.S.A.
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Quote:
Quote:
First the 750 Ebrock is a performer series carb , the thunder series is only 650 and 800 , the 750 has issues tell your buddy to get a Holley.
Quote:
some of the oem type replacement pistons are around 8:1 compression with 88cc heads and .039 head gaskets. going from 10:1 to 8:1 will kill a bunch of torque off. from looking at the 750 edelbrock specs they seem to be calibrated fairly rich. i'd also look at the advance curve also, especially if the compression is down.
As far as the 383 goes there was NEVER a real 10.0 engine out of the factroy in 68/69, the compression is actually more like 9.3 at best and going to 8.0 would make it worse .
What about the 70 engines with the positive deck height?
There are no factory 383's with POSITIVE deck height , positive deck height is an NHRA ALLOWED SPEC and that is only for 68/69 330 AND 335HP 383's . 70 spec is a few thou in the hole as it had a lower advertised compression ratio than the 68/69 engine . to get 10.0 with a 383 you need a piston that's POSITIVE about .020 AND a 79.5 cc combustion chamber , neither of which is FACTORY mopar as built.
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Re: 750 Edelbrock Problems
[Re: moper]
#308592
05/06/09 06:15 PM
05/06/09 06:15 PM
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Joined: Feb 2003
Posts: 2,810
Sobieski Wi
bee1971
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Quote:
Matt,
If you want to post a bit more detail about the engine (cam, intake, etc) I can help you with it. Like any carb, they all need tuning to be right. If someone bolts on a carb of any manufacturer and it's perfect out of the box, the owner doesn't know what really good is. If he needs it, worse comes to worse have him swing up to the farm. I'm finally HOME.
And you can tune that Eddy 750 all year long until you think its running perfect
and until you bolt another carb on there , the owner doesnt know what really good is
And you can take that to the bank - Do a search on the problems associated with the Eddy 750 - Hope your free for about a month , honestly its that bad
1971 Dodge Charger Superbee
2011 Ram Sport 1500 Quad Cab Deep Water Blue Loaded
Siberian Huskies
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Re: 750 Edelbrock Problems
[Re: SomeCarGuy]
#308593
05/06/09 07:09 PM
05/06/09 07:09 PM
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Joined: Jan 2003
Posts: 74,974
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,974
U.S.S.A.
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Quote:
Ah, a blueprint spec...
No NHRA and blueprint are not the same. I have a 69 383 HP , 56k original miles , the pistons are .006 in the hole , the CH is 1.932 , which at a blueprint deck of 9.980 would have the piston .003 in the hole , my block is .003 tall on the number one hole.
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