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by Simon.Gardiner
Sun Nov 01, 2020 3:38 pm
Forum: Four stroke
Topic: Piston ring gap placement
Replies: 4
Views: 223

Re: Piston ring gap placement

I've always been advised to avoid putting a gap in the middle of the thrust face (which for an Ariel single is the back face). These days I space at wider than 120, moving the gaps nearer the gudgeon pin but with the any on the same side staggered. However the traditional way is 120 for a 3-ring and...
by Simon.Gardiner
Sat Oct 31, 2020 10:56 pm
Forum: Four stroke
Topic: Vinegar to clean rusted tanks?
Replies: 16
Views: 513

Re: Vinegar to clean rusted tanks?

Certainly wasn't using kitchen vinegar - it was whatever's supposed to be the 'good stuff' - white vinegar? Anyway, I've crossed vinegar off my list of useful rust removers forever. I'd recommend citric acid (very good, very cheap and easy to get), molasses solution (the best so far but takes rather...
by Simon.Gardiner
Sat Oct 31, 2020 7:20 pm
Forum: Four stroke
Topic: Vinegar to clean rusted tanks?
Replies: 16
Views: 513

Re: Vinegar to clean rusted tanks?

Well, I've tried de-rusting with vinegar and it was absolutely useless - so good luck to all you chaps who manage to get something out of it!

SG
by Simon.Gardiner
Thu Oct 29, 2020 10:41 pm
Forum: Four stroke
Topic: Fitting new valves and guides
Replies: 26
Views: 1375

Re: Fitting new valves and guides

They've got torque specs - but barely!

SG
by Simon.Gardiner
Wed Oct 28, 2020 2:33 pm
Forum: Four stroke
Topic: Ariel singles speed vs. ratio calculator
Replies: 19
Views: 524

Re: Ariel singles speed vs. ratio calculator

In third I can get it to 55-60 maybe, but I would be pulling it there by the ear... Might be worth re-visiting your ignition timing, I've occasionally found reluctant revving to be connected with not enough advance. (My old '53 NH would happily pull 60mph in 3rd, with a standard tune engine and 19T...
by Simon.Gardiner
Tue Oct 27, 2020 12:49 am
Forum: Ariel Talk
Topic: Huntmaster R&D
Replies: 15
Views: 944

Re: Huntmaster R&D

I've fitted a 500cc alloy head on my Huntmaster with flat topped IMD pistons with the 356 cam, goes like a steam train :D I'm told those 500cc heads have small combustion chambers - gawd knows what Steve's compression ratio is, I'm waiting for the weedy Huntmaster barrels to crack! :twisted: The '5...
by Simon.Gardiner
Wed Oct 21, 2020 11:47 pm
Forum: For sale/wanted - Bikes
Topic: Double adult sidecar
Replies: 15
Views: 1078

Re: Double adult sidecar

...This was with a 22T engine sprocket. Good grief - isn't a 22T your preferred gearing for a VH in solo trim, Paul??!!! :o We've a member of the local VMCC who ran a late Square for years (many decades probably, he's only recently passed it on to his son) with a big sidecar as family transport - i...
by Simon.Gardiner
Sun Oct 18, 2020 2:10 am
Forum: Member's Bikes
Topic: SpAriel MkII aka The Hermanator
Replies: 153
Views: 48028

Re: SpAriel MkII aka The Hermanator

All 'big-rib' 350 rods will easily take machining-out to take a 500 big-end (and it's fairly straightforward to machine the flywheels for the parallel-fit pin) - old 'tuning tip' passed on to me last century - but that rod you've got looks like it's been made with just that in mind!

SG
by Simon.Gardiner
Sat Oct 17, 2020 12:15 am
Forum: Member's Bikes
Topic: SpAriel MkII aka The Hermanator
Replies: 153
Views: 48028

Re: SpAriel MkII aka The Hermanator

That is one helluva weird con-rod! All I can think of is that the factory received a batch of 'funny' forgings and instead of throwing them out (maybe supply was a tad 'iffy' back in the late 1940s) someone found a creative solution.... :D I've got a pair of steel VH flywheels and they're definitely...
by Simon.Gardiner
Wed Oct 14, 2020 8:48 pm
Forum: Four stroke
Topic: '57 NH Cylinder Head Re-Assembly
Replies: 4
Views: 280

Re: '57 NH Cylinder Head Re-Assembly

The heads aren't machined (not by folks around here anyway!), some people use 1 'O'-ring per rod, some 2. Here's a selection of threads on the subject - I'll leave you to check out the Cheval article (2013) that seems to have a spec for the mod and see if it's different again to what's on the forum....

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