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Re: 5.13 Gears Anyone??? [Re: Sb Valiant] #1357814
12/25/12 06:02 AM
12/25/12 06:02 AM
Joined: Oct 2003
Posts: 1,409
Ont. Canada
10.90 Racer Offline
super street
10.90 Racer  Offline
super street

Joined: Oct 2003
Posts: 1,409
Ont. Canada
Quote:

The car is 2600 lbs w/o driver and about 2800 w/d. The car is down on hp with out a doubt!!



For all the parts you have been listing, you are way down on power........
Quote:

It needs a better carburetor like a holly 950 hp instead of the junk 750 proform street series we have on the motor now!



I doubt your carb is killing you that much...... 750's can easliy run into the nines at your wt........ Have you checked WOT???

Quote:

It also needs a way better set of headers. The ones that are on there now are only 1 5/8. They are very restrictive!!



Not uncommon to see headers of this size run into the mid to low 11's

Quote:

The timing needs tuned in. It may be way off because we never got a timing light on it.



This could be completely killing off your power...... Set the timing right........

Re: 5.13 Gears Anyone??? [Re: Sb Valiant] #1357815
12/25/12 10:48 AM
12/25/12 10:48 AM
Joined: Mar 2007
Posts: 1,608
Rudolph, Ohio
moparguy7074 Offline
top fuel
moparguy7074  Offline
top fuel

Joined: Mar 2007
Posts: 1,608
Rudolph, Ohio
Could be a fuel delivery problem...What mechanical pump do you have? What size line? There are so many factors you are listing that could be causing lack of power, the rear gear sounds like the least of your problems. Timing could be way off and slowing you down.

Re: 5.13 Gears Anyone??? [Re: Sb Valiant] #1357816
12/25/12 01:07 PM
12/25/12 01:07 PM
Joined: Dec 2012
Posts: 15
selah, washington
72340dustermike Offline
member
72340dustermike  Offline
member

Joined: Dec 2012
Posts: 15
selah, washington
i run a 72 duster with 513s and i love them i have had 456, 488s and i needed to 513s to get the rpm into the range i needed for the top of my power band.
the 488s went thought the traps at 6400 rpm 12.20s
i put in the 513s the best i got was 6800 rpm 11.41
that was a 340 60over motor with trw flat top pistons
mild cam
8" 5000 converter transbrake
shift at 1/2 6200 2/3 6400
like i said i love 513s
60' is 1.63 to 1.60
oh ya almost forgot sorry i am running a 29 in tall tire

Re: 5.13 Gears Anyone??? [Re: moparguy7074] #1357817
12/25/12 01:14 PM
12/25/12 01:14 PM
Joined: Oct 2003
Posts: 1,409
Ont. Canada
10.90 Racer Offline
super street
10.90 Racer  Offline
super street

Joined: Oct 2003
Posts: 1,409
Ont. Canada
Quote:

Could be a fuel delivery problem...What mechanical pump do you have? What size line? There are so many factors you are listing that could be causing lack of power, the rear gear sounds like the least of your problems. Timing could be way off and slowing you down.




Mech fuel pump.......... yup a whole new list of possibilities.....

#1 Fuel is way too hot
#2 pump is not adequate volume wise
#3 your pulling on your fuel system - how are your fuel lines routed?

Yes the gears are the least of your worries......

Re: 5.13 Gears Anyone??? [Re: 10.90 Racer] #1357818
12/25/12 01:22 PM
12/25/12 01:22 PM
Joined: Nov 2012
Posts: 358
western PA
S
Sb Valiant Offline OP
enthusiast
Sb Valiant  Offline OP
enthusiast
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Joined: Nov 2012
Posts: 358
western PA
We run a blue generic jegs electric pump and it has very good fuel pressure! It's get's like a steady 7 1/2 pounds and sometimes 8. I forget the size of the fuel line at the moment but it is way bigger then the stock line. How they are ran would have very little if none effect on performance. I think there may be alittle performace difference if we mess with the fuel delivery system but not alot. I think timing is problem going to be a pretty big gain. I Just got a new timing Light and Leak Down Tester For Christmas so will know some answers soon!

Re: 5.13 Gears Anyone??? [Re: Sb Valiant] #1357819
12/25/12 01:29 PM
12/25/12 01:29 PM
Joined: Oct 2003
Posts: 1,409
Ont. Canada
10.90 Racer Offline
super street
10.90 Racer  Offline
super street

Joined: Oct 2003
Posts: 1,409
Ont. Canada
Quote:

We run a blue generic jegs electric pump and it has very good fuel pressure! It's get's like a steady 7 1/2 pounds and sometimes 8. I forget the size of the fuel line at the moment but it is way bigger then the stock line. How they are ran would have very little if none effect on performance. I think there may be alittle performace difference if we mess with the fuel delivery system but not alot. I think timing is problem going to be a pretty big gain. I Just got a new timing Light and Leak Down Tester For Christmas so will know some answers soon!




How will you set the timing?? hopefully your timing is out........

Re: 5.13 Gears Anyone??? [Re: 10.90 Racer] #1357820
12/25/12 01:37 PM
12/25/12 01:37 PM
Joined: Nov 2012
Posts: 358
western PA
S
Sb Valiant Offline OP
enthusiast
Sb Valiant  Offline OP
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Posts: 358
western PA
The timing light has a nobe on it so I can set it by either adding timing or taking out timing. The timing isn't like real far out it's not like it won't show up on that light or atleast I don't think. If it some how is will just start moving the distributor to it shows up on the light lol. The engine does start up real real easy so it either has way to much or it's way down. All I can remeber if the fuel line is a 6an line.

Re: 5.13 Gears Anyone??? [Re: Sb Valiant] #1357821
12/25/12 01:39 PM
12/25/12 01:39 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
Master

Joined: Jun 2003
Posts: 52,972
Romeo MI
Quote:

We run a blue generic jegs electric pump and it has very good fuel pressure! It's get's like a steady 7 1/2 pounds and sometimes 8. I forget the size of the fuel line at the moment but it is way bigger then the stock line. How they are ran would have very little if none effect on performance. I think there may be alittle performace difference if we mess with the fuel delivery system but not alot. I think timing is problem going to be a pretty big gain. I Just got a new timing Light and Leak Down Tester For Christmas so will know some answers soon!




Fuel pressure is one thing but flow is more important

Re: 5.13 Gears Anyone??? [Re: MR_P_BODY] #1357822
12/25/12 01:42 PM
12/25/12 01:42 PM
Joined: Nov 2012
Posts: 358
western PA
S
Sb Valiant Offline OP
enthusiast
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Joined: Nov 2012
Posts: 358
western PA
I think it flows pretty darn good. I remeber when we were messing with the carburetor taking the lines off and draining it there would always be alot of fuel!!

Re: 5.13 Gears Anyone??? [Re: Sb Valiant] #1357823
12/25/12 01:46 PM
12/25/12 01:46 PM
Joined: Oct 2003
Posts: 1,409
Ont. Canada
10.90 Racer Offline
super street
10.90 Racer  Offline
super street

Joined: Oct 2003
Posts: 1,409
Ont. Canada
Quote:

The timing light has a nobe on it so I can set it by either adding timing or taking out timing. The timing isn't like real far out it's not like it won't show up on that light or atleast I don't think. If it some how is will just start moving the distributor to it shows up on the light lol. The engine does start up real real easy so it either has way to much or it's way down. All I can remeber if the fuel line is a 6an line.




You will be setting total timing...... right??? What is your total timing right now @ 3000 RPM???

Last edited by 10.90 Racer; 12/25/12 01:47 PM.
Re: 5.13 Gears Anyone??? [Re: 10.90 Racer] #1357824
12/25/12 01:53 PM
12/25/12 01:53 PM
Joined: Nov 2012
Posts: 358
western PA
S
Sb Valiant Offline OP
enthusiast
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Posts: 358
western PA
I don't know we never put a light on it yet. I will have answers when we put the timing light on it and start dialing everything in!!

Re: 5.13 Gears Anyone??? [Re: Sb Valiant] #1357825
12/25/12 02:34 PM
12/25/12 02:34 PM
Joined: Jun 2004
Posts: 6,780
Alabama
Mopar-Al Offline
master
Mopar-Al  Offline
master

Joined: Jun 2004
Posts: 6,780
Alabama
6an line all the way?

Re: 5.13 Gears Anyone??? [Re: Mopar-Al] #1357826
12/25/12 03:02 PM
12/25/12 03:02 PM
Joined: Nov 2012
Posts: 358
western PA
S
Sb Valiant Offline OP
enthusiast
Sb Valiant  Offline OP
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Joined: Nov 2012
Posts: 358
western PA
yes then it goes into a dual feed up to the carburetor

Re: 5.13 Gears Anyone??? [Re: Sb Valiant] #1357827
12/25/12 03:20 PM
12/25/12 03:20 PM
Joined: Aug 2003
Posts: 43,913
Bend,OR USA
C
Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
C

Joined: Aug 2003
Posts: 43,913
Bend,OR USA
Quote:

yes then it goes into a dual feed up to the carburetor


A #6 AN line is 3/8 I.D., those are good for feeding one fuel bowl each The Jeg blue pump is probally a Holley blue clone, made in China It may or may not be suffecient for how fast you want to go A good way to test the fuel system on the car is to jet the carb. up, all four jets together the same amount in size, to see if you can slow the 1/4 MPH down, by making it to rich IF you CAN'T you don't have enough fuel volume (supply), not fuel pressure One of my Carbs. had OEM Holley .110 needles and seats in it, I could not jet the carb. rich enough to slow the car down until I switch the needles and seats to .120 Lots of gremlins out there, some are easy to fix, some are not so easy Some dial back timing lights are not that good when used on a Hi Po race ignition, turn the knob all the way to the left and check the timing at idle, then without touching the knob see if you can figure out what total timing you have above 4000 RPM Let us know your results Maybe we can help you eliminate a gremlin


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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