Fitting a stronger big end to a 350

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david.anderson
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Re: Fitting a stronger big end to a 350

Postby david.anderson » Fri Oct 05, 2012 10:39 am

Wali
This guy specialises in Nortons but have a look at some of his flywheels and he does bigend mods. It might be worth talking to him.
http://www.pushrod-performance.co.uk/service2.htm
There is no substitute for a good crank.
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Wali.Badger.Taylor
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Re: Fitting a stronger big end to a 350

Postby Wali.Badger.Taylor » Fri Oct 05, 2012 7:16 pm

Thank you for all the replys, those cranks are delightful. does one of you nice people know the OD of a VH big end outer?

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Postby Simon.Gardiner » Fri Oct 05, 2012 10:04 pm

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 the real strength in competition use.
'55 Huntmaster, '56 VH, ' 51 VH, '80 R100RT, '00 Sprint ST (but all those Ariel parts can only make one running bike...)

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Postby pete.collings » Fri Oct 05, 2012 10:31 pm

Wali

I uploaded the Ariel section of an Alpha catalogue to the webmaster some time ago, it has all the dimensions of the crankpin and outer listed.
Look in the Knowledgebase under Document Repository/Generic/Miscellaneous

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Re: Fitting a stronger big end to a 350

Postby Wali.Badger.Taylor » Sat Oct 06, 2012 11:02 am

Thank you both, I am thinking of the VH bearing in a set of modified early 350 steel flywheels. I did not know that the ALPHA book was there but I will take a good look at it, are the ALPHA VH bearings ok now as I know there were problems with them in the past.
Thanks again for indulging my vandalisation of Ariels.

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Postby PeterW » Sun Oct 07, 2012 6:25 pm

Which bit broke?

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Re: Fitting a stronger big end to a 350

Postby Wali.Badger.Taylor » Sun Oct 07, 2012 7:38 pm

This bit...
Attachments
IMG_3572.JPG
IMG_3571.JPG

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Postby nevhunter » Mon Oct 08, 2012 1:22 am

Way back they had some trouble with the material, but reckoned they had rectified it. I'm talking 15 years or so. I don't really like the parallel fit pins. They can plough a bit of metal on asssembly and ruin the flywheel .( It can be enlarged and a suitable pin fitted) careful assemply and a little rounding it the lead in edge helps but they need quite a bit of interference fit. The keyway is a bad idea as the wheels distort due to the weakness caused by the keyway and it is not absolutely necessary anyhow if you assemble it carefully. I have made high tensile nuts and carefully machine the faces so they pull up evenly.. Nev

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Re: Fitting a stronger big end to a 350

Postby Wali.Badger.Taylor » Mon Oct 08, 2012 5:29 pm

It may not be clear from that picture but it is a tapered big end and was NOS not an Alpha replacement. There are a couple of guys making a very nice needle roller for a VH in the East Midlands do any of you have a contact for them?
I agree about the keyway, the only part of the crank assembly that needs keying is the timing shaft.

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Postby nevhunter » Mon Oct 08, 2012 11:21 pm

I think the original ones are Hoffman and Ransome and Marles. I only mentioned the parallel because that was the one proposed to use. I don't mind the tapered ones for ordinary use. The only wheels to fail noticeably appear to be the 53 and later Qualcast VH ones which were even fitted to the VCH's of that year, some of which blew up spectacularly.. I've never seen a set of steel wheels fail but many of them don't line up well as they distort more than the nodular iron ones.( Steel will bend). Nev


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