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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