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LionPride
LionPride Reader
8/15/23 10:34 p.m.

Because I'm going to need a crash course.

Javelin
Javelin GRM+ Memberand MegaDork
8/15/23 11:57 p.m.

That's been updated to have the triangulation front down bars, which is good. No transmission, they are direct drive (hence push trucks). All four wheels are different sizes and the track width and suspension geometry is whack a doodle. They share more suspension in common with formula D cars than anything else really. They are stupid fast. 

Wally (Forum Supporter)
Wally (Forum Supporter) GRM+ Memberand MegaDork
8/16/23 12:07 a.m.

All I know about them is that they look like a lot of fun to drive 

Jesse Ransom
Jesse Ransom GRM+ Memberand UltimaDork
8/16/23 12:41 a.m.

In reply to Wally (Forum Supporter) :

I have no idea how to make them do what they do, but I'd love to have a crack at it.

LionPride
LionPride Reader
8/17/23 10:08 p.m.

I think, if you were to mount the powertrain from a legend car and teach it to turn right, it might be a fun little buggy.

 Need to start investigating wrecked sport bikes.

MyMiatas
MyMiatas HalfDork
8/17/23 10:56 p.m.

I know they can be used to do Hill Climb road racing!

TurnerX19
TurnerX19 UberDork
8/17/23 11:10 p.m.

You can "square them up" and they will work pretty good on dirt or ice. There really is no place for a multi-speed gearbox though. Original engine in this could have been anywhere from 350 cubic inch to 410".  Legends power train is too little for this one. There should be a circle track near you that runs an entry level class called "Limited Sprints" . Circle track is difficult to master and awesome fun. 

Oapfu
Oapfu GRM+ Memberand Reader
8/18/23 1:03 a.m.

In reply to MyMiatas :

The guy with Imagine Media used to put together a lot of good rally and hill climb vids on YT!

https://www.youtube.com/@DevonAfroThunder/videos

LionPride
LionPride Reader
8/18/23 12:46 p.m.
TurnerX19 said:

You can "square them up" and they will work pretty good on dirt or ice. There really is no place for a multi-speed gearbox though. Original engine in this could have been anywhere from 350 cubic inch to 410".  Legends power train is too little for this one. There should be a circle track near you that runs an entry level class called "Limited Sprints" . Circle track is difficult to master and awesome fun. 

 

We aren't going to have the budget for racing.  I don't think it is up to current standards.

 

Noddaz
Noddaz GRM+ Memberand PowerDork
8/18/23 8:08 p.m.

I wonder how hard it would be to covert a in out box with a clutch?

TheRyGuy
TheRyGuy Reader
8/18/23 9:07 p.m.

In reply to Noddaz :

Perhaps OP could look at what parts are used on Silver Crown cars for the clutch parts, in out function is usually done in the rear axle.

LionPride
LionPride Reader
8/19/23 10:49 a.m.

LionPride
LionPride Reader
8/19/23 10:52 a.m.

 

LionPride
LionPride Reader
8/19/23 10:55 a.m.

gumby
gumby GRM+ Memberand Dork
8/19/23 11:19 a.m.

Dirt Sprints are basically catalog cars. Nerfs, bumpers, radius rods, brakes, drivelines and torque tubes have all been the same and available from multiple sources for decades.

Basically infinite gearing options for that rear axle. Putting a bike engine in there would have the benefit of including a built in clutch setup. Silver Crown clutch stuff is unique and expensive.

If you can fabricate and have good imagination, this rolling chassis is a blank canvas. Square it up and have fun.

Noddaz
Noddaz GRM+ Memberand PowerDork
8/19/23 11:43 a.m.

Put a Harley engine in it with a transmission and add lights for the street.

It would be the only one.

LionPride
LionPride Reader
8/19/23 11:49 a.m.
gumby said:

Dirt Sprints are basically catalog cars. Nerfs, bumpers, radius rods, brakes, drivelines and torque tubes have all been the same and available from multiple sources for decades.

Basically infinite gearing options for that rear axle. Putting a bike engine in there would have the benefit of including a built in clutch setup. Silver Crown clutch stuff is unique and expensive.

If you can fabricate and have good imagination, this rolling chassis is a blank canvas. Square it up and have fun.

That's kinda what I was thinking.  Bike engine and gear the piss out of it.

I know some of the Winters quick change rear end can be converted back and forth from solid axle to differential, but I'm going to guess this isn't an option here.

LionPride
LionPride Reader
8/19/23 11:55 a.m.

In reply to Noddaz :

My nieces husband works in a bike shop.  I'm sure someone has put a shaft on a Harley, but the Yamaha stuff is right out of a catalog and we need to keep it something high school kids can manage.

frenchyd
frenchyd MegaDork
8/19/23 12:36 p.m.
LionPride said:

That alone is worth $900 dollars   But you will spend 1/2 again  for a complete set of gears. 
    Driving a sprint car on dirt is  a difficult skill to achieve.  you have to be comfortable with steering for the fence in a 4 wheel drift, with the actual steering done by the rear end.    
  Basically you hold the steering wheel with the tires pointed to the fence  and use the throttle to aim  the car.   You never turn left  ( towards the infield) except when you're coasting back into the pits. 
Getting the full potential  from any sprint  car requires a great mechanic and a skilled driver. 
   Start on the shortest round track you can find .  A paperclip track ( 2 half circles on either end)  requires a lot more skill .  With the 1/2 mile and longer tracks  a giant pair of big brass ones is required. The velocity achieved on some of those,  especially the banked ones  is terrifying. 
      Remember you're doing this with  your arms harnessed close to your body.  That's so when you flip ( and you will)  you can't have your arms flying. ( it's how come there are so many 1 arm mechanics).  
     There is a transmission of sorts used. It's an in/out box.  For coasting into the pits  or pushing around the infield.  But you are sitting right on top of the driveshaft. 
       You really can't use anything with a carb.  There is just no way to deal with  the side forces.  Fuel injection is mandatory. But easy to master. Basically you control the fuel mixture by controlling how much fuel returns to the fuel tank. 
  Alcohol is what is used as a fuel. Methanol,!!!  That requires a full suit and helmet  to handle. It's really nasty stuff. 
 You can use E85 but you'll give up horsepower  and the engine will run hotter. 
      

LionPride
LionPride Reader
8/19/23 12:56 p.m.

In reply to frenchyd :

I don't think we will ever get it back on a track.  Insufficient money, time and driving skill.

We are going to look more at repurposing  it.

 

frenchyd
frenchyd MegaDork
8/19/23 1:17 p.m.

 Fair enough but realize  these are designed for one purpose. Anything else they are overbuilt and too big & heavy for something like a legends car.   

  I've be seen them on the street but it's a massive amount of work. To use a differential in the quick change  you'll need different  side plates.  And  then separate  axles.  a whole different rear suspension.  Coasting  around a corner with the locked rear ended the tires will squeal like a stuck  pig.  Plus try to almost come to a stop. 
        It will push forward and back in a straight line fine. But getting it to turn requires a floor Jack to Allow it to turn.   Basically you'd have to use a shortened power drive  ATF  transmission  and a regular automotive rear end.  Headlites tailites turn signals etc. 

matthewmcl
matthewmcl Dork
8/19/23 1:48 p.m.

Is there enough space (maybe moving the push bar) to put in a rear mount transaxle and make the rear end De Dion?

LionPride
LionPride Reader
8/19/23 2:58 p.m.
matthewmcl said:

Is there enough space (maybe moving the push bar) to put in a rear mount transaxle and make the rear end De Dion?

Won't say it can't be done.  I don't think it is practical.

LionPride
LionPride Reader
8/19/23 3:03 p.m.

In reply to frenchyd :

Yup, a shorty powerglide  and a fully rethought rear everything.  That seems to be the formula for running one on the street.

frenchyd
frenchyd MegaDork
8/19/23 4:53 p.m.

Good luck then. It should be fun when you're finished. 

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