Sprint car conversion Big boys toys

General discussion, builds/restorations, etc...

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aconsola
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Sprint car conversion Big boys toys

Post by aconsola »

I just got this today at a race, it needs some cleaning but is overall pretty nice. The wheels are chrome plated plastic, not aluminum, and I am unsure on the make of the front tires, and I haven't figured out how the rear section of the body is supposed to attach, it is just floating around the cage right now.
I have a few questions:
Who made the transmision?
what are the lugs on the back side of the cage for?
Does anybody have one? I could use some pix of how it should all go together.

I can't imagine it will handle all that well with the front suspension setup like this.
bbtsprintcar07.jpg
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bbtsprintcar07.jpg
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Can I just swap the caster blocks left to right to correct it or is this how they run them with the flat chassis?
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mikedealer
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Re: Sprint car conversion Big boys toys

Post by mikedealer »


aconsola
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Re: Sprint car conversion Big boys toys

Post by aconsola »

Thanks, that helps. The rear lugs are supports for the wing.
I've not seen his sprints before, but have seen some of his other builds, Ithink he out-blinged himself on those 2, definately need these 8) when looking.

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Re: Sprint car conversion Big boys toys

Post by toybaron »

definitely Trackmaster...

ebay: Item number: 170191160442 and Item number: 220199708939

nice one!

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Re: Sprint car conversion Big boys toys

Post by Eau Rouge »

I can help you with the setup and build of that car, no problem. I've had more than my share of sprint cars.


The suspension up front is bass-ackwards wrong. There is no way that car drove well at all. It was probably MORE than a handful, if not completely undrivable. The caster blocks definitely needed to be flopped to the other side of the car. We also used the 8-32 Associated washers under the front screws of the suspension blocks to add a bit more usable caster to the front.

The tabs on the top of the cage are for the wing mounts. Cutting a hole in the wing was wrong, too. We used bent lexan brackets or Rocket City or Dubro ball links/ball clamps to mount the wing up top.

The rear tail section usually mounted off of a single body post. With the Trackmaster, there is no provision for a body mount, so something will need to be fabbed to attach to the rear bulkhead. A stock rear brace should work fine.

The chassis is fiberglass G10, and was also available in graphite (I have one). The major difference in this car to an ASCOT/RCRC chassis is the front kickup from the RC10 tossed in favor of the flat front end. IT proved to only really work on SUPER smooth tracks. Anything with a bump, banking or any other imperfection was too much for this car to steer through.

The side nerf bars have a side brace on them, and that is another quick way to tell them apart from their ASCOT twins. The nerfbar on this car is actually from the ASCOT kit, as the BBT had two brace bars on top of each other.

The body on the car is a McAllister Gambler, and can still be bought new directly from Gary just for the asking.

The side panels and nerf bars on this car are mounted under the chassis, which was asking to get caught on the track. Most of us racers would mount those under the cage and on top of the chassis plate. Some handiwork on the aluminum was needed to poke the nerfs through the aluminum side panels, but it made for a much cleaner build.

In the two photo essays of those crazy polished Inet sprint cars, you can see the subtle differences between a Big Boy Toys kit and an ASCOT kit. Personally, I preferred to race ASCOT cars, but the style of the BBT car was nicer to look at (and they eventually made a downtube cage).

Ditch the long shocks in the rear, too. The kit was designed for 4 short front buggy shocks.

If you want, I could probably replicate a pretty close BBT wing that was run on that car, too. Pretty easy with some .030" lexan and a bench brake. ;) For some reason, many people in this area ran the wings clear. I don't know why. I ran mine with painted sides and clear centers because I liked the look.



If I can help with anything else, let me know. If there is one thing still bouncing around in my head from back then it's sprint cars on dirt ovals. :D



doug

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Re: Sprint car conversion Big boys toys

Post by scr8p »

great deal, aconsola. i like that a lot. i might have a shot at one myself in a couple months from an old racing buddy. i haven't seen it yet, but from what he told me, it's in pretty nice shape.

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Re: Sprint car conversion Big boys toys

Post by aconsola »

Doug,
Thanks for the info. The guy that sold it was an older racer(I think he actually runs a track). he sad that it was the older/original BBT car as it only had one tube in the rear, not 2 parallel u-shaped tubes.
Looking at Shodogs car:
http://www.tamiyaclub.com/showroom_model.asp?cid=36619&id=34
His only has one tube in the rear like mine, but his does not have the extra brace on the side nerfs. The wing mounts on Shodogs cage are also different.
Is shodogs actually an ascot then?

My car looks like mixed and matched parts.

With my fabrication skills, There is no way I am cutting the side panels to top-mount the cage on the chassis. I can understand the reasons for a racer, but as a shelfer I do not want to risk messing them up.

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Re: Sprint car conversion Big boys toys

Post by scr8p »

bbt had 2 different front bumpers, 2 different rear bumpers, and 2 different side panels. i'm pretty sure they had 2 different nerf bars, too.

shodog's is an ascot. if i remember right, he modified an andy's molded chassis for his.

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Re: Sprint car conversion Big boys toys

Post by Eau Rouge »

Shodog's is definitely an ASCOT chassis, yes.

BBT did go through many iterations of their chassis conversion kits, but I don't recall the single bar rear nerf with that era side nerfs.

They also did swanky louvered side panels, as well. Interesting, but kinda goofy looking on a sprint car.

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Re: Sprint car conversion Big boys toys

Post by scr8p »

here's a link to the old site. don't bother trying to send an e-mail, though...................

it list all of the parts they had for the car.

http://bigboytoys.homestead.com/sprinters.html

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Re: Sprint car conversion Big boys toys

Post by Mr. ED »

I didn't know trackmaster had metal sideplates for these transmissions also: mine's all carbon fiber.

Definitely a very cool car you got there.

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Re: Sprint car conversion Big boys toys

Post by shodog »

It's been pointed out to me that mine is an ascot not a BBT like I have it listed as. I have been meaning to finish it off with a wing but haven't made it to the metal store to get some high quality aluminum sheet to make it with.

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Re: Sprint car conversion Big boys toys

Post by Woobie »

Eau Rouge, Thanks for that awesome information.

Please tell me, is this Ascot (I told people it was for years,) or BBT?

Image
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Re: Sprint car conversion Big boys toys

Post by scr8p »

woobie, yours is an ascot.

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Re: Sprint car conversion Big boys toys

Post by Eau Rouge »

ASCOT = RC10 noseplate
BBT = single flat chassis

Though it appears that you have BBT side nerfs on your car. :)

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