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> unusual 914, built for drag racing
messix
post Sep 7 2006, 12:16 PM
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QUOTE(Aaron Cox @ Sep 6 2006, 08:41 PM) *

ok... the dual diff thing is stupid scary......

welded diffs or they wouldnt spin..

maybe a spool, not welded spiders.
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maf914
post Sep 7 2006, 12:19 PM
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QUOTE(Mike T @ Sep 7 2006, 05:31 AM) *

The rear suspension is a DeDion design. See the "upside down vee" looking rectangular tube structure? That connects the 2 (!) differentials together. It will act like a live axle that just arches up over the transmission. It also has a 4-bar drag car trailing arm setup and a Panhard bar to control lateral movement. It's an OK design except for the fierce amount of unsprung weight. Looks like enough room for a short driveshaft between each differential and the transfer case.

Mike T


I was thinking DeDion too. It looks vaguely like the setup from the Chaparral 2H, which was probably the only Chaparral that was a dud. Caterham used a DeDion for many years on their higher priced Caterham Seven models.
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Britain Smith
post Sep 7 2006, 02:18 PM
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Ok, I understand how the crazy 2 diff car with transfer chains works, but I am still working on the details on the belt drive car....anyone care to explain?

-Britain



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messix
post Sep 7 2006, 02:50 PM
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you gotta be blond!

engine drives tranny, tranny drives driveshaft, driveshaft drives rear diff, rear diff drives gilmer belts, gilmer belts drive half shafts, half shafts drive wheels. duh!
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turboman808
post Sep 7 2006, 04:23 PM
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No more it's making me sick
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Aaron Cox
post Sep 7 2006, 07:09 PM
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QUOTE(messix @ Sep 7 2006, 01:50 PM) *

you gotta be blond!

engine drives tranny, tranny drives driveshaft, driveshaft drives rear diff, rear diff drives gilmer belts, gilmer belts drive half shafts, half shafts drive wheels. duh!

(IMG:style_emoticons/default/agree.gif)

simpler than the chain thing....
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jimkelly
post Sep 7 2006, 07:32 PM
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Just got back from the dragstrip to my buddy lay down some rubber. Stayed long enough for him to do 4 passes - it all held together - his 0-60 foot times were better than last year with 901 tranny but he may have lost a large fraction of a second in the long run due to all the extra weight.


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Chris Pincetich
post Sep 7 2006, 07:38 PM
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Damn! I've never seen pink leopard print to baby blue fade look sooo good. Sometimes it's not the destination that is important, but how much fun you have getting there. (IMG:style_emoticons/default/smoke.gif)
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URY914
post Sep 7 2006, 07:44 PM
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How many body kits are on that thing???
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Mike T
post Sep 8 2006, 07:58 AM
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Here is another version of the drive belt "transaxle". Text says it uses dragster parts. Supercharger pulleys and belts?


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URY914
post Sep 8 2006, 08:18 AM
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That looks like a much better way to do it.Simple and light. (IMG:style_emoticons/default/smile.gif)

That chain thing on the other one scares me. Too many moving parts, bearings, shafts, etc...
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Air_Cooled_Nut
post Sep 8 2006, 02:57 PM
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Why a belt, uhm, drive? Seems like an over-complication.
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Boojum
post Sep 8 2006, 03:39 PM
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QUOTE(Air_Cooled_Nut @ Sep 8 2006, 02:57 PM) *

Why a belt, uhm, drive? Seems like an over-complication.


Why? It actually makes damn good sense. The supercharger on a Top Fuel dragster uses a good portion of the 6000-8000 horsepower the engine puts out. I've heard that it can take up to a thousand horsepower just to drive the supercharger on a Top Fuel car... And you know how fast that blower is expected to take to spin up from 2,000 RPM idle to 9000 RPM?

I don't know exactly, but it sure is a violent thing, and that belt takes the abuse, plus slowing the mass of the supercharger down when the run is over, which is just as bad, if not worse, as the acceleration to top speed.

It's hard to get that kind of performance out of a chain, and the belt is more efficient at doing its thing, to boot! It's gotta be more cost effective to do something like this than buying a Porsche gear box, or Hewland, or ZF, or Mendeola, and then hacking it in so it fits, and it means you can use off the shelf parts when it decides to break. Plus, if you wanted, you could change pulley diameter to add a little flexability to your setup.

I'm impressed. It's KISS (Keep it simple, stupid) incarnate.
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Air_Cooled_Nut
post Sep 8 2006, 03:47 PM
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I was more curious as to why one would opt for belts/chains when using axles would appear simpler. Now I realize that the tranny being used isn't a TRANSAXLE so that somewhat makes the drive shaft routing understandable. I wasn't questioning the belt strength as many autos/motorcycles use belts and that technology has come a long way.
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andys
post Sep 8 2006, 04:05 PM
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Yeah, MikeT, that's a way better pic.

Reason for all this is to be able to facilitate a nice beefie trans/R&P with standard parts, etc. I think it's actually a tidy and unique solution.

Andys
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Boojum
post Sep 8 2006, 04:33 PM
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Air Cooled Nut: Ah, misunderstood what you were getting at. This method has the same basic effect of a transaxle, though.

I think the air ride and A-arm setup in those photos is pretty cool also.
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byndbad914
post Sep 8 2006, 05:11 PM
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QUOTE(Mike T @ Sep 8 2006, 06:58 AM) *

Here is another version of the drive belt "transaxle". Text says it uses dragster parts. Supercharger pulleys and belts?


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crazy looking, but at least this would have way less unsprung weight than hanging a diff at each wheel. Actually looking at it, it really isn't that bad an idea, the 3" blower belts are uber strong, and you could set the engine forward a little, squeeze it in with a powerglide and put a 914 in the 8s with a strong V8. crazy with such a short wheelbase tho'. Maybe stretch the wb 6" so it wouldn't go too outta proportion, everything would fit, section front and rear fender areas to make up the 6". Lots of work for what I would consider no good reason, but to each his own! Look at the mess I created in my car (IMG:style_emoticons/default/biggrin.gif)
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byndbad914
post Sep 8 2006, 05:24 PM
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btw- the windsheild has an 8.98 index (I am assuming that is what that means). Was that 1/8-mile or 1/4-mile track. I assume 1/8, but ya never know.
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Mike T
post Sep 8 2006, 05:46 PM
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Figure a 930 transaxle, adapter etc at , what?, 5k? I've heard that figure. If you have machine shop access and talents maybe you could build one for less. Donno.

There is a "shorty Powerglide" available that would shorten the entire package to fit under a 914 rear for sure. The unit pictured has a Richmond 5-speed and a Ford 9". I figure it would put the punkin at the rear bumper at best. Pretty heavy too. If I had the machines I would attempt it. Probly get away with a tubing bender, welder and a Bridgeport. Maybe a lathe.

Mike T.
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jimkelly
post Sep 8 2006, 05:49 PM
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my buddy emailed me to say that his best time for the night on the 1/8 mile strip was a 7.95 @86 mph. Please email me any info you guys regarding the belt systems mentioned in this thread as my buddy is going back to the drawing board but has serious concerns with using belts. Jim
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