Vintage SRB gearbox mods (or modern motor options)

[Mad Ax]

Hi all,

I'm sure this question must have been asked and answered a million times already but Google isn't being my friend today. I've recently acquired a couple of vintage SRBs that I was hoping to restore into light runners but I don't have any motors that will fit the vintage SRB gearbox.

I've tried the black-can Sport Tuned and that doesn't fit, nor does a Saturn 20, which is my "weapon of choice" for all of my light-duty runners, being bargainously cheap and consistently reliable, providing a good bit of punch without the need for an expensive ESC.

Anyway, I'm looking for some photos or a doc somewhere that shows what needs to be done to get modern motors to fit - I'm guessing I need to get hacking, filing and grinding; do people normally cut the motor surround right out and reinforce the remaining motor plate with a stronger steel or ally one, or can the recess be widened with something like a dremel? I am expecting a dremel wheel to get badly clogged trying to grind that soft metal.

Has anyone had success milling the motor recess out? I've got access to a pillar drill but it's a single speed which is probably too fast, and I don't think I have a cutter that wide. That said, there are some guys on my street who have a few machining tools who might be willing to let me try to turn the motor recess out.

Alternatively, if anyone happens to know of a cheap, Sport-Tuned-esque, easy-to-source motor that will fit the vintage gearbox without the need to buy expensive speedos etc please let me know

Thanks in advance and good vibes to anyone who can assist

Ax

[Finman]

I've just done this on my old Rough Rider so that I could fit a Sport Tuned.

Used Blacque Jacque's guide to help http://www.tamiyaclub.com/showroom_model.asp?cid=63500&sid=19691.

I used a sanding drum attachment on the Dremel and just removed small amounts checked and then rechecked - only took 15 mins.

Only other thing to watch, is if the gear casing has the enlongated lug - if the motor has the four vents on the front you'll need to remove it.

Rich

[Mad Ax]

That's exactly what I was looking for, I knew there would be something somewhere explaining this in detail, I just couldn't find it for some daft reason.

Huge thanks Finman

[cosworthwesty]

Top tip I've just done this to my Super Champ gearbox housing.

Thanks

[Shodog]

On my rough rider I have modified the gear case to accept a modern Brushed Epic 17Turn modified motor.

Like the above tutorial, I used a sanding drum to open up the hole. I also removed the mounting tabs and drilled a hole to secure the motor with one screw.

[Burmanater]

Dude where did you get those tires?

[scootmike]

They look like AYK 566B Super Tail tires that have had lugs removed, never seen them done like that, looks cool!

[Shodog]

Scoot mike is right, they are AYK 566b tires with one lug removed. They hook up really well in the sand

[scootmike]

What is your method on removing the lugs?

I'd like to try it sometime.

[Shodog]

I trim them with a pair of flat sided side cutters. Like the ones you would use to make flush cuts of parts parts from sprues. Then you can use a coarse sanding drum on a Dremel to clean it up

[scootmike]

Thanks for the tips on trimming the tires, I'm going to have to give that a try.

Sorry about derailing the thread.