T-Rex or Cheetah? 4mil, 7,mil, 10mil? Opinions?

[fastrnrik]

Hey guys, just looking for some honest opinions on the pro's and cons of the
T-Rex setup vs. the Cheetah setup. And what crank seems to be the best fit?
I've never been a Banshee guy, but I've always heard that Cheetahs were the
sh!t for drag racing, but the T-Rex may just as good for my application? I don't know. Gimme some input.

To help you decide... We are going to use this bike for flat track racing on tracks from 1/4 mile up to 3/8 mile. Bigger tracks where we can f-l-y....We are going to run this motor in a Lonestar Outlaw Banshee w/ 250R goemetry.

[fulltiltrider]

Its all about how much money you want to spend

[369DuneBunny]

i kind of agree.

but with the cheetah, there are a million different companies who have a million different types of port jobs for exactly what you want on the cheetah cuz it's been around longer.

and with the stroker,,,,, do you want to take the time to trench the cases, and do you think you need a stroker that big? whatcha gonna be doing?

[fastrnrik]

I'm not made of money, but I will spend more to get the better product. Nothing worse than settilng for something and not being happy with it down the road.

I understand there are a milliom options on porting, etc. I'm really wanting to know which cylinders better than the other, and why. Maybe they're not? That's why I'm asking. I know the T-Rex seems to be considerably cheaper than the Cheetah.

The bike will only be a flat track bike, and will only come out of the trailer for the bigger tracks. It will never be trail ridden, MX'd etc.

[369DuneBunny]

alot of ppl flattrack the cub with a 4mm. but it is on the bigger tracks. no tight ovals. ur not gonna have fun with it on a 1/8 mile

[dajogejr]

There is no way a TRex is cheaper than a cub, you have to have their head, their intakes, etc.
A cub will use all your old stuff.

Now...a Cheetah with a powervalve would be what I choose. 4 mil 421. Broad power due to the power valve, yet killer top end.

And yes....it will be pricier.

[Bansheeman11]

I run a T-Rex set up for flat tracking and it works out fine, you have just got to go through the whole kit and custom it for your application. A few little tips?!

Lower the compression a lot, aim for 8 to 1 corrected if you run race fuel, lower if pump gas.

Do not widen the exhaust port at all

flow the cyl head for better cooling

run plenty of piston bore tolerance



I would definatly run the 10mm stroker set-up if i were you

[drag lt guy]

The cheetah is what i would recomend. It has a much better out of the box power because its a much better port layout. for the T-rex to run with a cheetah it will take alot of time in re-working the ports.

[PassionRE]

Really depends on what style of power your looking for and how the engine will be used, HP to dollar ratio is always a concern as well. Broad usable bolt on power , but a little pricey.... Cheetah, excellent drag engine but pricey with lots of re-work to run well ....Cheetah, excellent drag engine with less re-work and less money and as fast as the re-worked Cheetah....Cheetah Cub. For small flange drag engines, 4mm crank is all you need, save the money and run just as fast or faster on the 4mill if your builder uses real science and not opinions while building it.....Jim

[369DuneBunny]

listen to that guy above me ... he knows what he's doing... mad scientist type shit when it comes to cubs and cheetahs