Visit The Dirt Forum for More Information

Author Topic:   Motor Combinations...
jammin
Dirt Administrator

Total posts: 5556
posted October 21, 2001 08:43 PM UIN: 16262997
Tell me something....I watch these guys running V-6's in mods that do really well. From what I see, the situation that is involved is that the RPM range moves up and the torque range moves up in the car, which allows the engine to be more forgiving at the bottom end to keep the tires hooked. Ok....if someone else agrees with this scenario, why in the world will a short stroked small block chevy work just as well in a mod? 327, 307, 283's that are built right are a similar scenario as the V-6. It is a given that there is a weight difference, but overall, why do you think that these motor combinations wouldn't work? I know everyone goes with Cubes, but on smaller slick tracks, these motors might work just as well or better?

bbracer17
Dirt Freak

Total posts: 256
posted October 21, 2001 10:36 PM
I ran a 327 with a 2 barrel and it worked fine for me. There are other people I know that run them on all tracks and are very quick. I think the main reason the v-6 does so well is because of the rear weight percentage gain that you get with it.

jammin
Dirt Administrator

Total posts: 5556
posted October 21, 2001 10:42 PM UIN: 16262997
The thing I see is that, take a Cart car....those guys use short stroked motors for those cars and turn them to the moon with short stroked motors and they fly because they are a lighter car and then they can hook them up easier. What is the difference in a modified? Light car....lower gear, more rpm, less torque?


jammin

rjjracing
Dirt Roller

Total posts: 11
posted October 22, 2001 11:20 AM
Don't want to go into detail but we run a small motor and only turn 7300 at the most and only been ran away from one night this season. It's not the motor it's getting the car hooked up.If I told you what we ran you would'nt belive me. We have a big motor for sale if interested. lol

Racer4
unregistered Total posts: 11
posted October 22, 2001 01:47 PM
Once I ran a $50 shortblock 327 straight out of a junkyard, I put my heads and oil pump off a blown motor. Ran 7000 rpms twice a lap. But that was a heavy car, and we were down on torque. You just can't beat the short stroke motor's for longevity in stock form. If I had been a better driver and had a better set-up, I am confident the motor was capable of winning.

Oldsmobile13
Dirt Maniac

Total posts: 108
posted October 22, 2001 07:01 PM
I have a freind that has built a hot 283 and he swears that next year he will out run my 355 with his RPM, i laughed at him but maybe hes on to something.

NWModracer
Dirt Full Roller

Total posts: 51
posted October 23, 2001 07:23 PM
There's a guy out here that runs a V-6 in his Outlaw Late Model and you'd never guess that he has two less cylinders.

The big difference is weight. Even if you have a weight rule, getting the weight in the right places to get hooked up is more important. You can get enough power out of a V-6 or small V-8 to run out front, many cases too much power if you can't feel for that traction sweet spot will slow you down.

KWTracer
Dirt Freak

Total posts: 233
posted October 23, 2001 08:53 PM
Let me ask you this just for grins. Wouldn't it make sense, that if your engines are restricted by carburetor size, a 6 would have a denser air charge per cylinder than an 8 because the fuel and air, which is limited, is divided between 2 less cylinders, thus creating more power per inch than an 8 cylinder motor?

Oldsmobile13
Dirt Maniac

Total posts: 108
posted October 23, 2001 10:49 PM
Never thought of it that way. What are guys running for V6s 4.3 chevy, 3.8 buick or something better?

Bluebomber
Dirt Full Roller

Total posts: 27
posted October 24, 2001 07:43 AM
has anyone thought of running a 4.0 ford? Those engines run for hundreds of thousands of miles in street cars so they have to be pretty tough. Never seen a carb maninfold for one though.

bluebomber

holeshot
Dirt Full Roller

Total posts: 53
posted October 24, 2001 02:19 PM UIN: 3728
I ran a 302 13 to 1 motor a few weeks ago and did not like it to much.switch to a 383 and like it much better.

Pickles
Dirt Maniac

Total posts: 144
posted October 26, 2001 03:40 PM
OK, weight to horsepower/torque ratio to rear weight. I dont see any big blocks running but have wondered about the extra weight helping to make the rear tires stick.

More cubes = less rpm = cheaper parts = more reliable. All of that is a given.

It would seem that the real differance in engine size has to do with engine weight and getting that weight through a corner.

So, how much engine weight is too much?

NWModracer
Dirt Full Roller

Total posts: 51
posted October 26, 2001 10:48 PM
Engine choice out here was the Buick. Don't really know why, but until I looked at it I thought he was running a strong SB Chevy.

If you can setup your Mod to barely make weight and still have the weight where you want it then why bother, but most of us are looking to shave a pound or two here or there so we can put it back where it would be better.

Gene
Dirt Freak

Total posts: 230
posted November 01, 2001 06:40 PM
Well, I hope to be able to answer you question Jammin, cause I'm putting a V6 car together now. I've been running 383/377 and gearing tall, this V6 has good innerds so I'm agonna' twist it. Builder says the power is 5100 to 7650, and good for a burst to 8000. I'll let ya know. I've got about $5500 in it.

spde
Dirt Maniac

Total posts: 139
posted November 05, 2001 08:44 PM
Does anyone know the weight that you will save by running a v-6? I have been toying with the idea of running a 6, basically because we don't have a weight rule. The other reason is because the tracks we run are mostly always dry slick. What about runnig on tracks that are 1/4 or 3/8 mile long? Anyone have any luck on either one? Most of our tracks are low to mid banked. I have to talk to my engine guy before I get any real big ideas. ltr good luck

NWModracer
Dirt Full Roller

Total posts: 51
posted November 06, 2001 12:58 PM
I have also been considering a V-6 in a second car, since we are always dry slick. Here is a link that has some information on engine weights http://www.team.net/sol/tech/engine.html and you'll see that a v-6 is about 100lbs lighter. Another thing to note is that the engine is shorter and depending on your track rules, the engine location is dictated either by the furthest forward sparkplug or the bell housing flange. But either way it should be easy to get 60% rear and still have a very light car.

General
Dirt Maniac

Total posts: 151
posted November 06, 2001 02:39 PM
hey guy's if you want lightweight, use the 302 ford with aluminum heads. The cost of a V-6 would be extravagent by comparison, and what would the differences be in pounds? I bet the ford might be lighter than many V-6's out there. Just an idea.

shadowz
Dirt Full Roller

Total posts: 50
posted November 07, 2001 01:19 AM
I've been debating about building up the 200 v-6 that came in my malibu .... anybodies thoughts?

Flatlander
Dirt Freak

Total posts: 310
posted November 08, 2001 11:29 AM
We used to run a292 inline six against the V-8 spanked em a lot of the time but you had to keep it wound up loved to run it though it was an edge at the time we got a weight break but that only lasted a short while Fun though

Back to the Archives