VH timing gears

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pappleton
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VH timing gears

Postby pappleton » Sun Aug 02, 2015 12:16 pm

Some time ago there was a guy advertising on ebay - Nottingham rings a distant bell - who was making cams and timing gears for VH/NH singles. I did call him and the gears are not the same DP as the originals, therefore have to be changed as a pair. What l did notice is that the half time pinion had 3 keyways, all the better to dial in the cam timing, l guess.
Has anyone else used these parts?
Has anyone got contact details? i promptly put them in a safe place, we all know how that goes......
Paul Appleton '53 VH plunger, '53 VHA rigid - in many boxes, '58 H.D. pan/shovel rigid

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keith.mettam
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Re: VH timing gears

Postby keith.mettam » Sun Aug 02, 2015 3:34 pm

Hi Paul,
I too noticed these cams and, after a bit of brainstorming, remembered it was a seller that went by the ebay shop name of prideandclark. Found them on ebay and, by looking at one of the present items up for sale, have come up with the following details for you (published on ebay) :-

MICHAEL ASH
2A Middle Holme Lane
Sutton on Trent
Nottinghamshire
NG23 6PG
United Kingdom Phone:01636|821981 Email:arielfeetup@aol.com

No new cams from him on ebay at the moment but the guy is obviously worth contacting. When I last saw a set on ebay (probably a year or so ago) they were priced at £189. I contacted him reference an HS cam and seem to recall he said that they only did new single lobe standard ones.
Good luck !
Keith.

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pappleton
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Re: VH timing gears

Postby pappleton » Sun Aug 02, 2015 6:06 pm

Thanks very much for that Keith. I shall give him a call
Paul Appleton '53 VH plunger, '53 VHA rigid - in many boxes, '58 H.D. pan/shovel rigid

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Re: VH timing gears

Postby david.anderson » Mon Aug 03, 2015 10:43 am

I have previously also contacted the same seller and was advised that the tooth was a different form and so had to be used in pairs. Recently an Australian manufacturer has also made pairs of timing gears that are again a different tooth form. This could be a problem for the future when some unsuspecting person tries to interchange a cam without knowing that there are aftermarket gears out there having a different tooth form.
I believe that singles spares may be having some half time pinion gears made that will have 3 keyways as a result of interest that has previously been shown. They will of course be the correct tooth form to match the Ariel cam gear.
The need to alter the valve timing a little will only be necessary with a reground cam when the cam grinder has got the grind out by a few degrees. Ariel factory cams are more consistent than aftermarket regrinds, although some of the HS grinds when run with 2 similar followers will perform better when advanced a little.
To go from a VH follower to a HS follower will advance the valve timing by about 12 degrees. A change in follower type on one valve is a way to manipulate the timing of only that one valve.
It is also possible to cut extra keyways in the cam gear. A change of I full tooth alters the valve timing by 14.4 degrees. 3 even space keyways gives a 4.8 degree change per keyway while 6 even spaces gives a 2.4 degree change. After carefully checking valve timing on aftermarket grinds that did not perform as expected I realised that the valve timing was not as per specification. By advancing the cam to a near straight up timing I got a considerable improvement in performance.
Below is a photo of a cam gear that I have cut extra keyways in to give a 2.4 degree change per keyway
David
IMG_0376.JPG

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Re: VH timing gears

Postby keith.hodgenia » Mon Aug 03, 2015 1:30 pm

I heard that the Pride and Clark name was used by someone a Hitchcocks the Enfield specialists. I've no idea if it is true but it might be worth a phone call.


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