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The Independent Scratchbuilder
Posted 28 February 2013 - 02:14 PM
First Cobra Invitational
August 24, 1968 - Buzz-A-Rama Raceway, Brooklyn, NY
Four Plumber's Nightmares and a Puzzle Pan have a go in Cough City
Model Racing Journal Race Report
Sandy Gross' Mura/Cobra Powered Puzzle Pan - Vintage Replica by Steve Okeefe
Steve Okeefe
I build what I likes, and I likes what I build
Checkered Flag in Hand
Posted 18 December 2014 - 02:56 PM
Checkered Flag in Hand
Posted 19 December 2014 - 11:16 AM
In 1968 i had to run Cobra motors instead of the Bob Kean motors that were the best, due to company policy changes at Cobra. In almost every race that year i spun a pinion because there was no solder that would hold them on. They just got so hot the pinions would just fly off. I guess you found this out also Fred. lol.
Age scrubs away speed!
Posted 19 December 2014 - 11:40 AM
Were you guys using 60/40 or a silver solder on your pinions? I got some high-temp silver solder from Russ Boyington in the early 70's & have been using it on pinions ever since.
Checkered Flag in Hand
Posted 19 December 2014 - 12:08 PM
silver solder
Checkered Flag in Hand
Posted 19 December 2014 - 12:41 PM
Yes, exactly, the car stopped when the pinion spun. If I waited a couple of laps the solder would cool and I could go another few laps............not racing Gross and Cukras that way!
Mid-Pack Racer
Posted 19 December 2014 - 12:57 PM
Brownells sells some very hi-temp (640 to 650 deg. F) soft silver solder, 38000 psi tensile strength, for 14.99 per 1 oz. roll. That's about 200 deg. F higher temp than regular Stay-Brite silver solder. It's 95% cadmium/5% silver, so don't breathe the fumes or use it on food preparation surfaces.
Should all but eliminate pinion spinning in anything (except maybe some GRP 7 cars).
Checkered Flag in Hand
Posted 19 December 2014 - 02:38 PM
You should have told me that 45 Yrs ago!
Mid-Pack Racer
Posted 19 December 2014 - 03:06 PM
You should have told me that 45 Yrs ago!
What, that you shouldn't breathe cadmium fumes? Everyone needs an excuse to eat more cilantro ...
Age scrubs away speed!
Posted 19 December 2014 - 06:28 PM
The Harris Group also sells Stay Brite 8, (6%) a higher temp solder than their normal 4% Stay Brite. It's often used for soldering the pillow blocks of steel wing car chassis.
