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Author Topic:   RPM
Coolhand
Member
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
Member
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
Administrator
posted December 09, 2001 06:16 PM
6800 is the target....


ford5
Member
posted December 09, 2001 06:52 PM
7500-7800 small block Ford


mod27
Member
posted December 09, 2001 06:53 PM
6800-7800 (depending on track)


jklostermann
Member
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
Member
posted December 09, 2001 07:14 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
Member
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
Member
posted December 09, 2001 11:53 PM
I run stock reconditioned rods and cranks with speed pro pistons turn 6800-7200 no problems with brakage so-far!


wfoondirt
Member
posted December 11, 2001 05:28 PM
358 target is 8500
421 target is 7800


36k
Member
posted December 11, 2001 09:38 PM
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
Member
posted December 13, 2001 07:55 PM
Makes you wonder?
The Peddler


FastFred
Member
posted December 17, 2001 11:35 PM
Better knock on some wood xman!!


rockit
Member
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
Member
posted December 19, 2001 11:46 AM
Thanks guys Looks like I can twist it a little harder.


Racer14K
Member
posted December 19, 2001 08:51 PM
7400-7600


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


Jet Hydro
Member
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
Member
posted December 27, 2001 07:42 AM
Shoot..I turn 8500 in my hauler, gettin to the track.. lol


holeshot
Member
posted December 27, 2001 10:32 AM
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
Member
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.