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Author Topic:   RPM
Coolhand
Dirt Full Roller

Total posts: 42
posted December 09, 2001 06:02 PM
What RPM are you guys turning your engines at? I run a 1/4 and 1/3 mile track and turn 5700 to 6000

modified17
Dirt Roller

Total posts: 20
posted December 09, 2001 06:09 PM
I've got an all steel 406. On a 1/4 mile tacky track, I have to run 7200 or the car lays down in the corners. I talked to Kerry Norris one night after he finished 3rd at the Terre Haute Action Track (1/2 mile). He said he would turn 7400.

jammin
Dirt Administrator

Total posts: 5060
posted December 09, 2001 06:16 PM UIN: 16262997
6800 is the target....

ford5
Dirt Freak

Total posts: 221
posted December 09, 2001 06:52 PM
7500-7800 small block Ford

mod27
Dirt Full Roller

Total posts: 72
posted December 09, 2001 06:53 PM
6800-7800 (depending on track)

jklostermann
Dirt Forum Racer

Total posts: 88
posted December 09, 2001 07:06 PM
I don't like to go too much over 8000 I try and keep it around 7200-7400

CNC DOC
Dirt Full Roller

Total posts: 44
posted December 09, 2001 07:14 PM
7200rpm

bbracer17
Dirt Freak

Total posts: 252
posted December 09, 2001 08:46 PM
6800 max. My engines have cast cranks and hyper pistons with Eagle rods so I don't twist them as high as other people.

Dirt2race
Dirt Full Roller

Total posts: 40
posted December 09, 2001 09:39 PM
If you are going to approach 8000, you better have a darn good set of heads and some good valve train components. Most heads that don't have serious porting, will not yeild much power gain above 7200. Just some food for thought.

MOD RACER#93
Dirt Freak

Total posts: 309
posted December 09, 2001 11:53 PM
7500 to 8000....stock crank, cheap rods, vortec heads w/stock valves and Z28 springs...with the Ultra-light pistons i had they turned much off the crank when balancing to make it really light...my new engine i plan to turn around 7200 max

andykmod
Dirt Full Roller

Total posts: 40
posted December 09, 2001 11:55 PM
I run stock reconditioned rods and cranks with speed pro pistons turn 6800-7200 no problems with brakage so-far!

wfoondirt
Dirt Freak

Total posts: 242
posted December 11, 2001 05:28 PM
358 target is 8500
421 target is 7800

36k
Dirt Maniac

Total posts: 103
posted December 11, 2001 09:38 PM
Jeezzzz you guys I get 8800 with a cracked 76lb crank, cast pistons, 5.560 rods and no valve springs, **** sometimes they even last 1 lap !!!!!!!

xman
Dirt Roller

Total posts: 13
posted December 12, 2001 02:37 AM
8,000 all day long w/a 355 steel crank recond. rods, 100.00 cast pistons. built by self all 4 years never went booommm!

PEDDLER
Dirt Freak

Total posts: 227
posted December 13, 2001 07:55 PM
Makes you wonder?
The Peddler

FastFred
Dirt Newbie

Total posts: 4
posted December 17, 2001 11:35 PM
Better knock on some wood xman!!

rockit
Dirt Roller

Total posts: 17
posted December 18, 2001 10:30 PM
no tach in car but around 7500 .it would probably be a good idea to stand back from the fence when it lets go.if you no what i mean

tagteam racing
Dirt Roller

Total posts: 18
posted December 19, 2001 11:46 AM
8500 rpm no matter what track. The question is how much are you putting to the ground...

BILLY BOB
Dirt Maniac

Total posts: 101
posted December 19, 2001 11:52 AM
I don't like to turn much over 72 to 74.
After that my cam runs out any way and why wearout the bearings for no reason.

Coolhand
Dirt Full Roller

Total posts: 42
posted December 19, 2001 08:20 PM
Thanks guys Looks like I can twist it a little harder.

Racer14K
Dirt Forum Racer

Total posts: 97
posted December 19, 2001 08:51 PM
7400-7600

ScottGreer
Dirt Full Roller

Total posts: 62
posted December 24, 2001 12:23 PM
7800-8900 depending on track conditions. Crowler crank and rods, roller cam, and brezinski heads

Jet Hydro
Dirt Roller

Total posts: 20
posted December 27, 2001 04:20 AM
I run mine in the low 7`s. They will go in the 8`s but I have found out that most of the reaces I have won I only turned them 6500rpm....hummmm..... just my .02 cents
3/8 and 1/2 mile dirt.

------------------
I`ll Race that, give it here!

cmiller51
Dirt Full Roller

Total posts: 52
posted December 27, 2001 07:42 AM
Shoot..I turn 8500 in my hauler, gettin to the track.. lol

holeshot
Dirt Full Roller

Total posts: 51
posted December 27, 2001 10:32 AM UIN: 3728
6800 to 7000 JR Motorsports 355 short block camel hump 186 heads team g intake great on slick track and claim rule

CUSTOMPERFORMANCE
Dirt Freak

Total posts: 464
posted December 27, 2001 07:34 PM
i have tryed several different engine combos and several different cams and i was always the fastest only turning my engines 6800-7200 and no higher any higher i seemed to go slower.

wfoondirt
Dirt Freak

Total posts: 242
posted December 28, 2001 12:03 PM
it really depends on head/cam/intake combo to where you're going to make the most power. for example the 358 combo that i've run the past 2 years, roller cam, 18 degree heads, and brodix hv1001 intake we tried several different rpm ranges with several different cams. We tried running lower rpm's (6800-7600) and found that reguardless of the cam the torque curve was very peaky and hard to drive, thus the reason we turn that motor around 8500. For all intents and purposes it really doesn't matter what you turn a motor as long as the parts can take it, the goal is find a combo that works good together and creates a smooth torque curve.The best way to accomplish this is to select components carefully and talk to the cam manufacturer before buying a cam, and find a engine builder that will spend time on the dyno before the motor ever hits the track.

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