[Healeys] Vernier timing gears

[Bob Spidell]

re: " ...The original cam has been reground to the BJ8 profile which 
changes the duration and the lift. Once the cam is changed or modified 
vernier cam gears are almost a must to get accurate cam timing no matter 
what the desired timing is. ..."

Excellent point; presumably, the original, fixed setup would only be 
correct with bone stock parts?


On 7/8/2017 9:11 AM, Harold Manifold wrote:
> Hello,
> I am surprised with the number of comments this topic has attracted. I 
> am in the process of rebuilding a 29D series AH 3000 engine and 
> purchased vernier cam gears from AH Spares some months ago. The engine 
> is not finished yet but the AH Spares cam gears are well made and I 
> thought I would list the reasons why I bought them. My situation might 
> not apply in all cases but it is one perspective:
> The engine was in poor condition and is undergoing a full and complete 
> rebuild but every indication is it led a hard life and was not well 
> cared for. The condition of the original cam chain and gears was 
> unknown and new replacement parts are not expensive compared to the 
> cost of the rebuild.
> The original cam has been reground to the BJ8 profile which changes 
> the duration and the lift. Once the cam is changed or modified vernier 
> cam gears are almost a must to get accurate cam timing no matter what 
> the desired timing is.
> The rocker arm assembly was completely rebuilt and re-chromed and this 
> will affect the valve timing as well.
> The professional engine builder I am working with has rebuild many AH 
> engines and can attest to the benefits of optimising the cam timing 
> which can only be done with adjustable gears. My car will be a daily 
> driver but will have more HP than stock.
> Bye for now.... Harold
>
> ------------------------------------------------------------------------
> *From:* Healeys [mailto:healeys-bounces at autox.team.net] *On Behalf Of 
> *warthodson at aol.com
> *Sent:* Thursday, July 06, 2017 6:41 AM
> *To:* waschu2 at gmail.com; healeys at autox.team.net
> *Subject:* Re: [Healeys] Vernier timing gears
>
> I would use thin AN washers under the head of the AN bolt.
> Gary Hodson
> -----Original Message-----
> From: Wayne <waschu2 at gmail.com>
> To: healeys <healeys at autox.team.net>
> Sent: Wed, Jul 5, 2017 7:12 pm
> Subject: [Healeys] Vernier timing gears
>
> Hello,
>
> I am getting back to my Healey 3000 engine rebuild after two
> years. I bought the Roller master vernier timing gear set from Moss at
> that time. I have previously used the Roller Master gear set with
> multiple key ways to adjust the cam timing with no problems on other
> rebuilds. What I don't like about this set is that the cap screws used
> to clamp the vernier gear to the hub are not very robust. Working in
> aviation I have AN-4 bolts that I can replace the cap screws with and
> safety wire them to prevent slippage. Has anyone using this kit had
> problems? I could keep the cap screws and Loctite them. This is a
> street car, not a race car. Pictures are one bolt installed and the
> hardware side by side.
>
> Wayne
>
>
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