I guess the real question is: what's the goal of this setup? Is it simplicity, efficiency, light weight, or?
I guess the real question is: what's the goal of this setup? Is it simplicity, efficiency, light weight, or?
I won a bet in my old M3, only used one gear for a short trip that involved city and highway. Standard ratio 5 speed with stock 4:10 rear and short tires. It would take off fine in third and go almost 90mph with the Dinan tune. I think it weighed about 2800lbs. I don't know what you are going to do with your single speed but it is possible, with enough thrust it may even accelerate well, just not as well as more gears will.
Why even use the trans at all at that point? All you need is an input shaft and a bellhousing for the clutch.
My dad ran bottom 8s at 200 MpH with a simpler setup. Just a clutch in a can with an input shaft close coupled to the rear end.
But he also ran junkyard 354 Polys converted with Hemi heads, rock hard tires, and open rear diffs. Technology marches on...
Cooter said:Why even use the trans at all at that point? All you need is an input shaft and a bellhousing for the clutch.
My dad ran bottom 8s at 200 MpH with a simpler setup. Just a clutch in a can with an input shaft close coupled to the rear end.
But he also ran junkyard 354 Polys converted with Hemi heads, rock hard tres, and open rear diffs. Technology marches on...
Nitro and top fuel cars run a centrifugal clutch. No transmission in them either.
In reply to MotorsportsGordon :
Centrifugal? Thought they were regular diaphragm clutches. There are software packages now to get the clutch slip progression just right.. it used to be "intuition".
Ex employers dad used to machine the clutches between runs for consistency.
Knurled. said:In reply to MotorsportsGordon :
Centrifugal? Thought they were regular diaphragm clutches. There are software packages now to get the clutch slip progression just right.. it used to be "intuition".
Ex employers dad used to machine the clutches between runs for consistency.
From an article in Hot Rod:
"These 3,700°F carousels of steel, titanium, and sintered iron are foot-clutched and centrifugally-activated with a computer-controlled release, get rebuilt between every run, and act as the sole control over power delivery after the 11,000hp Hemi does its job."
https://www.hotrod.com/articles/inside-fuel-cars-3500f-slider-clutch/
rslifkin said:I guess the real question is: what's the goal of this setup? Is it simplicity, efficiency, light weight, or?
All of that. Number one goal is light weight because that makes everything perform better. The other main factor is making sure AngryCorvair eats my dust.
In reply to Cooter :
In my simple mind I'd just take a trans input shaft with a u joint on the end and shove it in the bell housing but my mind can't figure out how to to control it from moving in and out as the rear end goes up and down.
In reply to Stampie :
Well, on the old man's Altered, the rear was mounted rigid, but for your application, you could use a two piece driveshaft like this one from a Jeep-
In reply to Cooter :
I was thinking about it afterwards and wondered if a carrier bearing might be the answer.
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