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by Simon.Gardiner
Fri Oct 19, 2012 8:21 pm
Forum: Ariel Talk
Topic: Hi compression piston & HS cams in NH
Replies: 61
Views: 17559

Brenton (or David) - are you using the usual huge tappet clearances for those timing graphs ? (And Brenton from your posts on pistons you might be getting rather less blow-by and crankcase pressure with the new sleeve? :) ) The Mk1 cam has .450 lift, the mk3 cam .410 (info from Paul Jameson's articl...
by Simon.Gardiner
Fri Oct 19, 2012 8:01 pm
Forum: Ariel Talk
Topic: Pushrods for Singles
Replies: 23
Views: 3267

Vincent - you got 4 baguettes with that packet as well ? :-)
by Simon.Gardiner
Tue Oct 16, 2012 11:21 pm
Forum: Ariel Talk
Topic: Hi compression piston & HS cams in NH
Replies: 61
Views: 17559

There are several articles in the knowledge base about HS cams, they seem to be about use in a 500 but the consensus is that the Mk3 profile is better for road use and the Mk1 profile is approaching 'full race: this seems to be born out by comments about length and diameter of exhaust pipe - which a...
by Simon.Gardiner
Sat Oct 06, 2012 11:21 pm
Forum: Ariel Talk
Topic: Its a mystery to me
Replies: 10
Views: 1787

??????????????????????????????? Can't see how either would work unless done really carefully and cleverly. But why go to all the trouble? I think I remember my rocker spindles being 'blind' on the spark-plug side, so oil wouldn;t be able to get through that way. Unless I've misunderstood Paul's desc...
by Simon.Gardiner
Sat Oct 06, 2012 11:06 pm
Forum: Ariel Talk
Topic: To hone or not to hone?
Replies: 13
Views: 1979

Some of the guys with BSA A10 Rocket/Super Rocket engines have got over the problem of barrel weakness after sleeving by brazing ithe top and bottom of the sleeves into the barrels, which allows the sleeve to take some of the stress and apparently isn't too difficult to do.
by Simon.Gardiner
Fri Oct 05, 2012 10:21 pm
Forum: Four stroke
Topic: '51VH crankshaft end float
Replies: 5
Views: 1275

You can put standard 1" (shaft diameter) shims behind the thicker spacers and the flywheels - Drags sell 'em.

(I'd not be surprised at the clearance changing if mains/big end have been replaced)
by Simon.Gardiner
Fri Oct 05, 2012 10:04 pm
Forum: Ariel Talk
Topic: Fitting a stronger big end to a 350
Replies: 19
Views: 3485

My not massively accurate calipers say 1.940. A 350 rod can be machined out to take it (if I get your drift!) I know of one that's been done like this, although not for racing. I heard of this years ago as the mod that all the 'racers' used but I expect someone out there will know a bit more about t...
by Simon.Gardiner
Thu Oct 04, 2012 10:10 pm
Forum: Four stroke
Topic: VH 500 1949 Head gasket
Replies: 8
Views: 4362

I think the 51-53 models used a copper head gasket and if I remember rightly the VH spigots are the same size and it fits the earlier ones as well.

(I seem to have acquired one of those copper ring gaskets somewhere along the way, Mr Collings might just have pointed me to its origins!)
by Simon.Gardiner
Thu Oct 04, 2012 9:55 pm
Forum: Ariel Talk
Topic: Fitting a stronger big end to a 350
Replies: 19
Views: 3485

Re: Fitting a stronger big end to a 350

This will be done and extra web will be welded in to suport it. I had some extra welding done in the timing chest, the welders had a lot of difficulty as some of the castings were seemingly quite porous and had absorbed an amount of oil. Two of my three timing-side crankcase halves ended up as scra...
by Simon.Gardiner
Wed Oct 03, 2012 10:11 pm
Forum: Ariel Talk
Topic: To hone or not to hone?
Replies: 13
Views: 1979

I've had several 350 barrels and a 500 barrel (all iron-head type) sleeved and had no problems. It might depend on the OD of the sleeves - I doubt if any of the ones used for me were 'factory spec', probably the closest of what was available at the time. I don't find they wear particularly badly, I ...

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