VHA liner installed
- Roger Gwynn
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Re: VHA liner installed
The guy who made the cylinders for John is still making as far as I know.
Roger Gwynn, Membership Secretary, curator of the Machine Register and the works drawings. Director of Draganfly Motorcycles, Craven Equipment and Supreme Motorcycles mostly retired.
- alan.moore
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Re: VHA liner installed
Ian,Ian.Taylor wrote: ↑Wed Feb 28, 2024 1:33 am I finally got around to installing the VHA liner into my spare VHA cylinder.
Heated cylinder, cooled the liner in a snow bank.
When the cylinder was hot the liner was wiped down and it dropped in nicely with a clang as the spigot touched the cylinder.
I used 3 T120 cylinders stacked to weigh the liner down.
Once cooled there is a gap of .004 between the cylinder and spigot.
Here's a pic of my VHA cylinder. Not been fully re-sleeved as far as I can tell but a thinner standard liner has been fitted inside the original. Looks like the piston seized and split the thinner liner.
Anyway, clearance between liner spigot and barrel about 8 thou
1939 VH Redhunter;1942 RN WNG;1951 Triumph 6T Thunderbird;1970 BSA B175 Bantam;1986 Yamaha SRX600 single;1952 VHA engined project
http://cloggymoore.wix.com/triumph-pre-unit-6t
http://cloggymoore.wix.com/triumph-pre-unit-6t
- Roger Gwynn
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Re: VHA liner installed
There should not be a gap there
Roger Gwynn, Membership Secretary, curator of the Machine Register and the works drawings. Director of Draganfly Motorcycles, Craven Equipment and Supreme Motorcycles mostly retired.
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Re: VHA liner installed
Mar 3 here in Eastern Ontario was a beautiful 60f .
I just had to get the VHA out for a ride plus I was curious as to what Temps they run at.
Sure beats the winter blues right ?
After a 45 mile ride mostly at 50-55 mph these are the Heat/temp readings I got.
Exh rocker box 240f
Exhaust area approx 240f
RH side of the cylinder just below the head 230f
1/2 way down 210-15 f
Bottom at pushrod tunnel big drop at around 160
Crankcase 100f
Reading were very close on opposite side.
Intake track 150f
I just had to get the VHA out for a ride plus I was curious as to what Temps they run at.
Sure beats the winter blues right ?
After a 45 mile ride mostly at 50-55 mph these are the Heat/temp readings I got.
Exh rocker box 240f
Exhaust area approx 240f
RH side of the cylinder just below the head 230f
1/2 way down 210-15 f
Bottom at pushrod tunnel big drop at around 160
Crankcase 100f
Reading were very close on opposite side.
Intake track 150f
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Re: VHA liner installed
you will find that nikasil is not suitable for coating direct onto the aluminium of existing Ariel cylinders. I tried and it failed, and others I know that have had other makes of older cast cylinders nikasil lined direct onto the aluminium have also had failures. Nikasil is however ok on new high quality castings or better still on cylinders made from billet.
David
David
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Re: VHA liner installed
Good info to know David !
- pappleton
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Re: VHA liner installed
Mike Dickson was the guy who made the HS cylinders, primarily for the trials fraternity. Unfortunatly he too passed on and the business went to his son. I believe it has been sold again and have been told that quality has suffered. I have no contact details but would take a chance if some kind person would supply. I was at Shepton Mallet last w/e and found an almost complete but very rusty old HS engine in bits. Head was a std 500, welded up fins, plugged and re-drilled rocker box holes and welded up combustion chamber due to some past catastrophe. The asking price was astronomical. I visited JB a couple of months before he passed and I am so glad that I bought his freshly rebuilt HS engine and at a reasonable price!
Paul Appleton '53 VH plunger, '53 VHA rigid - in many boxes, '58 H.D. pan/shovel rigid
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Re: VHA liner installed
I think that was Mick Dickinson - see also the posting in 'Suppliers'
viewtopic.php?t=12856
(Maybe someone will have an update.)
SG
viewtopic.php?t=12856
(Maybe someone will have an update.)
SG
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'55 Huntmaster, '56 VH, ' 51 VH, '62 Arrow, '80 R100RT, '00 Sprint ST (now with a new Arrow project, and just now those 4-stroke Ariel parts can't even make one running bike...)
'55 Huntmaster, '56 VH, ' 51 VH, '62 Arrow, '80 R100RT, '00 Sprint ST (now with a new Arrow project, and just now those 4-stroke Ariel parts can't even make one running bike...)
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Re: VHA liner installed
Maybe we should go the way Velocette did. Revert to the Cast iron barrel and steel push rod cover tubes for cooling and lightness and have the fifth stud for the 500's incorporated in a new pattern. If I was a bit younger I'd probably do it. The pattern is not that complicated. The Later 500cc twin did that so there's precident. Alloy barrels are a whole lot of angst sometimes. Nev
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