12-04-2022, 11:41 AM
(This post was last modified: 12-04-2022, 11:49 AM by Steve Jones.)
My trials Chummy, now sold, was very similar to Bob's in specification other than it was coil, not mag, and 12v. It had a modern 'thick' radiator core and it too led a pretty hard life to say the least. The only hill I ever experienced any overheating was Bealey Plantation used on the John Harris Derbyshire Trial. That's a long flat out pull where you keep your foot down and on a couple of occasions, when it was a warmer than usual late winter/early spring day we got a bit of steam at the top leading to hearing the fuel boiling in the SU float chamber when we stopped and vaporisation when setting off again. Other than that, a bigger problem was getting it to run warm enough and I often used to blank off the bottom third of the radiator.
The fan belt was set quite loose and I do wonder if having it a bit tighter so that the fan was properly driven would have helped on those runs up Bealey. Mind, with the best engine fitted, we did see 6500rpm sometimes...
Steve
The fan belt was set quite loose and I do wonder if having it a bit tighter so that the fan was properly driven would have helped on those runs up Bealey. Mind, with the best engine fitted, we did see 6500rpm sometimes...
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Steve