Rear mounted engines

[sukaB]

What do you think!
Wave of the future of our sport or weight distribution.
Shannon Cambell's 350 powered new rig going to work as good as (BIG) TINY or is it his weight that offset's the little motor...!

 

[I Lean]

I still think Tiny works well despite the rear engine, not because of it. The many little things they've done to add unsprung weight to the front offsets the lightweight motor. (as does the driver )

For that reason, I'm thinking the new Campbell rig won't work as well as Tiny does. It's not as light, not as low since the driver's sitting on top of the drivetrain instead of next to it, and has a heavier motor.

Sure will be fun to watch though, won't it?

BTW, the rumor mill says Nelson&Nelson are working on a front-engine buggy for next year. Interesting.

 

[Hickey]

I like it. Run a light aluminum motor backwards, and you can run 9 inchers upside down, with straight cut gears.

 

[RockMonkey]

Light is the key, but I really think you want the weight (that you do have) up front, and down low. I do dig the idea of running upside-down nines. Anyone got a link to the new Campbell buggy? I wanna see it.

 

[Hickey]

You mean this one?

 

[Shawn]

Not to HiJack,, but can someone explaine that front end?? I'm at work so posting a pic won't work.

An adjustable arm on one side (why make it adjust?) and a single on the other. Is this strong enough?

 

[RockMonkey]

Interesting... Even with the rediator, battery, winch, driver, etc, up front that is a lot of weight out back. Will be interesting to see if it tends to flip over backwards on the climbs. Doesn't seem like a lot of room for a rear drive shaft, does anyone know if they are planning on using a carrier bearing? I think it's cool that people are innovating and building different things instead of the same old crap (like me). Can't wait to see it go, will it be at the Supercrawl?

 

[Hickey]

Originally posted by Shawn
Not to HiJack,, but can someone explaine that front end?? I'm at work so posting a pic won't work.

An adjustable arm on one side (why make it adjust?) and a single on the other. Is this strong enough?

Actually, I think you are referring to the rear end. The front end has the centered diff and the triangulated four link. The rear has a track bar, and three links to the axle, is that the one you want to know about?

 

[Shawn]

Originally posted by Hickey
Actually, I think you are referring to the rear end. The front end has the centered diff and the triangulated four link. The rear has a track bar, and three links to the axle, is that the one you want to know about?

hahahah...

The motor got me off gard.... Let see what was the title of this post???


I feel so small...

 

[Hickey]

it's not just you, it is a confusing picture. you see the back of an atlas, a tri four link, and a centered diff, and you just assuume that's the back end.

 

[Hickey]

anyway, the suspension you were asking about, They are putting that exact thing on Cherocars now, and Bronco's. you only need the one upper arm to fight axle rotation, if you have two it will bind at some point.

 

[mbryson]

Is that an LS motor? That seems like that would be sh!!t to climb as you'd have plenty of rear traction. The front axle on a steep incline won't have as much grip as a 'normal' setup, but it might work better than any of us expect. INTERESTING


I like how low in the chassis it is, but it might be too far back (you do need to place the driver somewhere, though) to achieve the 50/50 weight balance that I'm thinking you'd want for a comp buggy. I'm thinking you'd like to err on the 50/50 weight ratio to the front, considering the extreme angles that are required in rockcrawling.

 

[Hickey]

yeah, LS1=crowd pleaser

 

[grinch]

Ok i understand the whole flipping the 9 inch to get it to rotate backwards to compinsate for the rear mount engine but.... How does the diff lube itself??? Is this a standard 9 inch or is it another ungodly expensive custome housing???

 

[Hickey]

you fill it "extra full"

 

[sukaB]

I agree,
I think a rear mounted motor would work just as well as a front- well positioned front mounted...
You don't have to mount a motor backwards to run 9"upside down...


can't wait to see the new rig work.....

 

[spencurai]

Originally posted by sukaB
I agree,
I think a rear mounted motor would work just as well as a front- well positioned front mounted...
You don't have to mount a motor backwards to run 9"upside down...


can't wait to see the new rig work.....

but do you need to run everything backwards to run straight cut gears?

are straight cut gears stronger than normal?

 

[Caleb]

Originally posted by spencurai


but do you need to run everything backwards to run straight cut gears?

are straight cut gears stronger than normal?

straight cut in a rear app are stronger but reverse cut in a front app are stronger than straight cut in a front app...the benefit to being able to run straight cut 9" gears is that there are no reverse cut gears for a 9"...the reverse cut gears that currie and others use are 8.8s...so they are not nearly as strong and ultimately end up being the weak link in a RC9" setup...

 

[RockMonkey]

Originally posted by supergper

...the reverse cut gears that currie and others use are 8.8s...so they are not nearly as strong and ultimately end up being the weak link in a RC9" setup...

You can ask Creighton for testimony about this one...

 

[mbryson]

Originally posted by RockMonkey

You can ask Creighton for testimony about this one...

I've experienced that very thing on Creighton's rig....We did drive at least 7 obstacles in Farmington on a cracked ring/pinion on the 8.8 though.