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How to build torque
#620965
02/22/10 02:58 PM
02/22/10 02:58 PM
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Joined: Feb 2009
Posts: 583
San Antonio, TX
CurYellowBird
OP
mopar
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OP
mopar
Joined: Feb 2009
Posts: 583
San Antonio, TX
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I'm doing a relatively stock HP 383 build and am either going to go with a stock replacement cam or the XE262H to keep good torque numbers.
What are some other ways of building torque? Increase in timing? Gears? etc.
I'll be driving a 71' Roadrunner, which is at or little over 4000lb. with the options it has and what not. So torque is important to move this tank lol.
Project War Bird:
1971 Plymouth Roadrunner
383 4 speed with air conditioning
GY3 Curious yellow
All original
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Re: How to build torque
[Re: DaytonaTurbo]
#620969
02/22/10 04:56 PM
02/22/10 04:56 PM
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Joined: May 2003
Posts: 15,487
Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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the whiplash from hughes has early intake closeing to build cyl pressure so it wont kill off any torque in a low CR engine thats gonna be my way of making some torque 
Last edited by scratchnfotraction; 02/22/10 04:56 PM.
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Re: How to build torque
[Re: scratchnfotraction]
#620970
02/22/10 06:33 PM
02/22/10 06:33 PM
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Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383
Too Many Posts
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Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
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well, if it's torque you want, then you'll be looking to maximize power at lower RPM, vs spinning it to 7500rpm for max power.
you'll want long intake and exhaust runners, smaller (stock sized) valves to keep air velocity up at the lower RPMs, and a smaller carb for the same reason.
the long runners like on a cross ram intake with the carbs out over the fenders, will make peak power at a much lower RPM due to the time it takes for the pressure waves to bounce back and forth inside. short runner intakes will make peak power at higher RPMs. same goes for exhaust, longer primaries on the headers makes for lower RPM peak power.
but, a cross ram or tunnel ram may be a bit extreme. an intake like the perf. RPM is a good compromise and will make good low end torque. any long tube header with a smaller primary size will also suffice.
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Re: How to build torque
[Re: Stanton]
#620972
02/22/10 07:09 PM
02/22/10 07:09 PM
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Joined: Feb 2009
Posts: 583
San Antonio, TX
CurYellowBird
OP
mopar
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OP
mopar
Joined: Feb 2009
Posts: 583
San Antonio, TX
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I'll be keeping the HP manifolds and probably the HP intake. I've heard good things about the HP intake flowing just as good as a performer, its just heavy as hell.
For compression, I think the 71' engines were 8.5:1 so I'm gonna definately get that up to par. I have a carter AFB 750cfm carb that the previous owner put on. I don't have the original one. I messed with camquest and the original cam specs or the XE262H is giving the best torque numbers along with good HP numbers.
What about exhaust tube sizing? I know 3 inch is far to large for a torque oriented build. I have the original exhaust that is quite clean and can be reused. I think it is 2 1/4 size tubing, but of course does not have a h-pipe.
Project War Bird:
1971 Plymouth Roadrunner
383 4 speed with air conditioning
GY3 Curious yellow
All original
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Re: How to build torque
[Re: SomeCarGuy]
#620974
02/22/10 07:54 PM
02/22/10 07:54 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Quote:
stroker kit
this.
otherwise your gonna need alotta rpm to get some
nice torque #'s.
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Re: How to build torque
#620975
02/22/10 08:00 PM
02/22/10 08:00 PM
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Joined: Feb 2009
Posts: 583
San Antonio, TX
CurYellowBird
OP
mopar
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OP
mopar
Joined: Feb 2009
Posts: 583
San Antonio, TX
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A lot of rpm to make torque? Isn't it the other way around where a lot of rpm makes horsepower?
I'm not stroking the numbers engine. I'm just looking at doing basic improvements to improve the engines performance and make up for some lost hp/lb. numbers in 71'.
Project War Bird:
1971 Plymouth Roadrunner
383 4 speed with air conditioning
GY3 Curious yellow
All original
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Re: How to build torque
[Re: CurYellowBird]
#620976
02/22/10 08:19 PM
02/22/10 08:19 PM
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Joined: Jan 2003
Posts: 5,186
Wherever I am.
Junky
master
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master
Joined: Jan 2003
Posts: 5,186
Wherever I am.
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Just stick with your plan. XE262H cam.
Work on the timing and carb setup. Tune, tune, tune!
Run that 2 1/4 inch exhaust with some good flowing mufflers. Add an H or X pipe if you can.
The Edelbrock Performer RPM intake will really help over a stock intake, but it's almost 2" taller than the stock intake.
If you need to do any head work, have them blended, milled 0.030 or 0.040 and have a 3 angle valve job, and use the steal shim head gaskets.
All this will give you a good running cruiser that'll run stronger than a stock 1970 Road Runner 383.
Your running a 4 speed, right?
Last edited by Junky; 02/22/10 08:19 PM.
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Re: How to build torque
[Re: Junky]
#620978
02/22/10 08:48 PM
02/22/10 08:48 PM
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Joined: Feb 2009
Posts: 583
San Antonio, TX
CurYellowBird
OP
mopar
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OP
mopar
Joined: Feb 2009
Posts: 583
San Antonio, TX
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Yep Junky, I am running a 4 speed
Project War Bird:
1971 Plymouth Roadrunner
383 4 speed with air conditioning
GY3 Curious yellow
All original
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Re: How to build torque
[Re: Sport440]
#620981
02/23/10 12:59 AM
02/23/10 12:59 AM
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Joined: Dec 2003
Posts: 5,314
Carstairs, Alberta, Canada
dave571
master
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master
Joined: Dec 2003
Posts: 5,314
Carstairs, Alberta, Canada
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I like the mild cam, and timing curve idea, but I'm going to respectfully disagree on the rpm intake. Go with the regular performer instead. I'm pretty sure the specs on the rpm specify that it is meant for lighter stuff, and higher stalls. I have a 400 I built for moving my 5000 plus van around, and it seems to work best with a stock iron intake. Don't get me wrong here, I run an rpm in my 330, but it's a little wilder. I think a regular performer, and tune it with 4 hole spacers to get a little more torque out of it, would be best for this 383. 
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Re: How to build torque
[Re: DaytonaTurbo]
#620983
02/23/10 08:53 AM
02/23/10 08:53 AM
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Joined: Feb 2005
Posts: 283
N.E. England
Roppa440
super street
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super street
Joined: Feb 2005
Posts: 283
N.E. England
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Where does torque come from?
I will tell you. It comes from the energy released from the fuel you burn. The more fuel you burn the more torque you have.
Simple as.
So larger capacity, forced induction, NOS, etc will all give you big torque.
Where you make that torque (at what rpm) is what decides how much HP you have.
All torque at low rpm makes for a poor performance engine. Like a steam engine or truck.
You are better making torque at high rpms if you want a good top speed.
That is where the cam (valve timing) comes in.
Best way to improve torque on a 383 is to stroke it or throw it out and fit a 440.
2002 Chevrolet Corvette 5.7 LS1
2011 Alpha Romeo Giulietta Veloce 1.6 JTD
Because running a Mopar in the UK is getting TOO expensive!!
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Re: How to build torque
[Re: Roppa440]
#620984
02/23/10 10:40 AM
02/23/10 10:40 AM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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headers are the cheapest way to make torque...in just about every BB dyno shootout Dulcich has done in Mopar Muscle, long tube headers usually pick up ~20 lb-ft over stock exhaust manifolds.
for your 383, I'd also run KB flat tops at 0 deck with closed chambered heads.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Mild cam and bone stock heads, stick with the stock intake or a performer or dp4b. A bit smaller runners keep the port velocity up which is what you want for torq. The RPM intake will actually give up a little torq down low compared to the other intakes I mentioned because of it's larger runner volume, which is unnecessary for his application.
