Why We Badmouth Dunstall 810 Kits

well Ando, its good to hear some positive about the Dunstall cylinders, no doubt there are others who have had success but only due to repairing the original fittings, a few more positive posts and I'll have to dig out a set and have a gander.
Maybe 750 alloy cylinders would be the go, with so many good performance upgrades available now I'm sure a 750 alloy cylindered bike with lots of goodies would be quite acceptable and fun for most streetsters

I was told once that the Dunstall barrels were cast by two different outfits. He said that the last barrels produced were superior to the earlier majority. I don't know if it's true or what the differences were. Jim

Where the original Dunstall barells helicoiled, Remember that man had only just got rid of the stone axe when these where made. i bet the Dunstall dommi-racers [that did well] where trouble free...then the Great apes got there banna like fingers on them.... In fact i have seen a Caveman working on bikes...tool box..
Two screw "chise"l drivers
Two adjustable spanners....one with the adjuster wheel siezed
Mole grips,
wooden rule..for precise tea stiring.
Old tube of Red Hermite..gone hard.
and a old spark plug.
The guy {ape person] had tighted down a triumph 500 rocker box that tight the gaskets had "popped out"
Plenty of Dunstall Dommi-racers did well..in the hands of Homo-saps

comnoz said:

I was told once that the Dunstall barrels were cast by two different outfits. He said that the last barrels produced were superior to the earlier majority. I don't know if it's true or what the differences were. Jim

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Jim,
Any idea who these two companies are/were? How about a time line regarding early and late? Anyone or anywhere I should look to find out more? I've got one of these beasts. It was never installed on the 1971 Roadster, which the original owner dismantled at some time in the past for a rebuild. It never got put back together.
Charlie

Many years ago I was in Dunstall's shop when an irate 810 customer came back for what he said was the third time with liner / barrel problems... this would have been 1972 . Clearly they did not improve.

Matt Spencer said:

Was the alloy from melted down parking meters or Spitfires or something ?? reading on the Rover K series fours , the alloy can be anealed by overheating ( boiling the motor badly ) turning it to scrap .

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Nah, Spitfires worked.

A lot of alloy barrels in the old days were made by Wellworthy. I had Wellworthy Alfin barrels on my Triumph - they cracked through the stud holes.

It would be interesting to know why nobody has ever produced a set of all aluminium barrels with Nikasil or similar plated bores. This would leave a lot more material around the screw holes, leading to less bore distortion. Triumph fitted some bikes with Italian made ally barrels with such a coating. There is also a chap selling similar for BSA A65s so they would appear to work.

Matchless said:

It would be interesting to know why nobody has ever produced a set of all aluminium barrels with Nikasil or similar plated bores. This would leave a lot more material around the screw holes, leading to less bore distortion. Triumph fitted some bikes with Italian made ally barrels with such a coating. There is also a chap selling similar for BSA A65s so they would appear to work.

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Well I have done a few and Steve Maney has done some.
I gave up trying to keep them round as the cooling was not even enough.
I would guess maybe Maney ran into the same thing as he quit making them also.
We are running one on the Bonneville bike. Jim

comnoz said:

Well I have done a few and Steve Maney has done some.
I gave up trying to keep them round as the cooling was not even enough.
I would guess maybe Maney ran into the same thing as he quit making them also.
We are running one on the Bonneville bike. Jim

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And Kenny Dreer did some for his 880 bikes. He originally had trouble with them, until he got the bore coating sorted out by Millenium Tech

http://www.millennium-tech.net/serviceInfo.php?id=1

Ken

Luvin my 828 a little more each day!


Glen