Thread: 57 Chevy Cruizer

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Do think the question of how much power does a GV take to run. It came to light in on one of the links I researched for you when guys where saying a Lenco does take more power but the advantages out wt the loss. Got me wonder about the GV units.

Originally Posted by rspears

I think I'd have to run a parallel circuit on that OD pushbutton to light an indicator lamp in a prominent place on my dash when that Gearvendors unit was engaged! I can just see myself exiting a corner tangent to the apex, with an "Oh yeah, I was in OD coming in...."

Dave, I know you've thought this thing through with some one-on-one bench racing sessions on the side and the decision is pretty much made at this point. I want to thank you for educating me on the Gearvendors unit. I had overlooked articles on them, like the one from David Freiburger singing their praises in Hot Rod (on Gearvendors web site). I'm thinking that I could have a blast with one of those and a traditional 4-speed in a cruising machine. I dearly love running the gears, and the unit's strong! I'll look forward to more insights into the powertrain you're building! Thanks!!

Already addressed it Roger, thinking it will be a light mounted off the base of the shift light....always seem to be looking at it when things are getting serious..... I was involved with a couple cars running these behind powerglides, and was amazed at the improvement in 60' times!!! If they do that much for a 2 speed, why not run them with a five speed???? I know the shift time on the od is faster then I can pull the handle for a regular gear change, too. Also, I was doing some suspension tuning on a customer's "open track" type Mustang many years back, he had one behind a Liberty modified T-10 4 speed, that shift to od out of a corner would keep the engine in it's peak torque and accelerate the car harder, I would imagine most of that is from the decreased loss of rpm between gear changes when going from a trans gear to the 22% increase in ratio of the od gear....

Dave,I brought up the GV idea on here afew yrs ago and everyone shot it down as being not cost effect for my RV. Well really here and on a RV forum I am apart of.
We have had numerous Super Gas cars that had glides with a brake running in the range of 1.27 to 1.25 60' times. I can see a glide in a car with a GV unit that is a street strip car. But I have my doubts about one behind a 700 hp engine with a brake. Those are very hard hits and I don't think a GV would work without braking.

Seeing as how I'm not building a Super Gas car with a glide and a brake I guess I don't really care what would work or not..... The Super classes have become nothing more then who can dial in the delay box and throttle stop the best.....doesn't interest me anymore.....

Maybe you could move your concerns to a Super Gas thread in the drag race forum????? I don't see any relevance to what I'm building and what this thread is about..............

I kinda feel the same way---those classes use powerglides with just 2 speeds for consistancy, not performance--its revolved to where they are using 10000hp 600 inch motors to run the speed you could do with a 265-----------its not racing, more like shooting craps with loaded dice!!!!!!!!!!

Brought it up because you spoke about it effect 60' times. Well,that and your expectation of what kind of output your car is going top have and if the GV would handle that. Still got me wondering how much loss of power the GV is going to end up with. Anytime you add to the drivetrain,I think it is reasonable to think it is at a loss of power. Just bench racing here................

Well, it looks like Gear Vendors doesn't share your concern, less then 1hp per 400hp loss, and they come with a guarantee....

Quote from their site;

The GEAR VENDORS uses a common vertex (cone) Raybestos clutch system. This means there is no parasitic loss through dragging and unapplied clutch pack. For this reason the GEAR VENDORS is the most efficient transmission on the market using less than 1 horsepower per 400. Imagine - we race the Dakar, Quatar, Tunisian, 24hrs of France, and Master rallies (over 6,000 miles each race) with just 24 ounces of fluid in the unit and no cooler. And, we have won the Quatar, Tunisian and the Master. You cannot do that if you are converting hp to heat.

The GEAR VENDORS planetary carrier and power flow are ideal for motorsports. The planet carrier is all steel and carries a double row of narrow caged needles in each gear instead of a single wide set. It is the most sophisticated planetary we know of. The 18 element roller clutch and drop forged annulus can launch the current world record holder in Super Eliminator with 1850hp as well as the current record holder of HotRod Drag Week (these are 7 sec passes in a 3800lb car. Most racing products are no where near the level of engineering found in the Gear Vendors simply because of their low production volumes. Gear Vendors sells thousands of expensive overdrives to muscle cars, street rods, trucks, towing trailers, and Rv's every year for (27 years). It is this production volume that drives the engineering and that would be hard to justify if your product was only sold in small quantities. For this reason the UNDER/OVERDRIVE™ is a real bargain for racers in performance, and engineering per dollar.
Unquote.

That seems to sum it up quite well......

Thanks for passing along the info Dave.

Got the cowl induction scoop roughed in for the '57. Used the original piece I cut out of the hood, then built the sides out of 20 ga. Just shot some epoxy primer on it so I can start smoothing things out on the hood now...

Originally Posted by Dave Severson

Well, it looks like Gear Vendors doesn't share your concern, less then 1hp per 400hp loss, and they come with a guarantee....

Quote from their site;

The GEAR VENDORS uses a common vertex (cone) Raybestos clutch system. This means there is no parasitic loss through dragging and unapplied clutch pack. For this reason the GEAR VENDORS is the most efficient transmission on the market using less than 1 horsepower per 400. Imagine - we race the Dakar, Quatar, Tunisian, 24hrs of France, and Master rallies (over 6,000 miles each race) with just 24 ounces of fluid in the unit and no cooler. And, we have won the Quatar, Tunisian and the Master. You cannot do that if you are converting hp to heat.

The GEAR VENDORS planetary carrier and power flow are ideal for motorsports. The planet carrier is all steel and carries a double row of narrow caged needles in each gear instead of a single wide set. It is the most sophisticated planetary we know of. The 18 element roller clutch and drop forged annulus can launch the current world record holder in Super Eliminator with 1850hp as well as the current record holder of HotRod Drag Week (these are 7 sec passes in a 3800lb car. Most racing products are no where near the level of engineering found in the Gear Vendors simply because of their low production volumes. Gear Vendors sells thousands of expensive overdrives to muscle cars, street rods, trucks, towing trailers, and Rv's every year for (27 years). It is this production volume that drives the engineering and that would be hard to justify if your product was only sold in small quantities. For this reason the UNDER/OVERDRIVE™ is a real bargain for racers in performance, and engineering per dollar.
Unquote.

That seems to sum it up quite well......

Well, well, well!
Thank-you very much!
I had no idea that a unit like this was anywhere in existence...it seems it can be used all-the-same as a two-speed diff...is that assumption correct?
And from previous posts it appears to be a very robust unit; will handle virtually anything that's thrown at it.
Some of the horse-power/tourque figures quoted as being put through it are amazing!

I think I'm going to have to do a google and find out more...sounds like it will be just the bee's-knees to think about for the bus...which will finish up weighing about 3.5 or maybe 4 tons.

And considering our undulating terrain here in New Zealand; the more gears ya got the more better...

(Oh, by the way; I'm enjoying your thread...thanks! )

.

Johnboy..They are available here in NZ..Ian Rainbow,in Auckland..Key West,sells them..You might have to sell ya missus so you can get the bucks together,though..dont think they are very cheap..

Interesting hood mods. How close will the back come to the glass? (if you don't mind me asking? 8-) )..

Originally Posted by 34_40

Interesting hood mods. How close will the back come to the glass? (if you don't mind me asking? 8-) )..

About 2" away from the windshield, hood will be hinged in the front

Originally Posted by Dave Severson

About 2" away from the windshield, hood will be hinged in the front

I figured you'd have to hing in front there isn't much if any room to open it up from rear with scoop Looking good and different at same time.