I guess my point in generating some "traffic" is best expressed by Mr.
Lawrence. With a single cam acting on the valve timing, one can set it
close to factory or deviate a couple degrees advanced or retarded for
low end torque or high rpm breathing. It is still a trade off versus a
twin cam head where both can be affected and gains can be easily (?)
obtained for both instances he states. Not too sure we all have easy
access to a dyno. These old long stroke 6/4's were designed for grunt.
That would be the wise choice. They don't like to be spun up much, then
the Welch crank would be necessary. $$ dave
On 7/7/2017 7:16 PM, WILLIAM B LAWRENCE wrote:
>
> According to Iskendarian You can optimize cam timing either to provide
> a boost in low end torque by advancing the timing by up to 8
> degrees or in high end power by retarding it a similar amount.
>
>
> Since I am looking for a low end boost and will rarely exceed 3500 on
> the road I set mine 4 degrees in advance.
>
>
> Waiting to see how it works out...
>
>
> Bill Lawrence
>
> BN1 #554
>
> ------------------------------------------------------------------------
> *From:* Healeys <healeys-bounces at autox.team.net> on behalf of Bob
> Spidell <bspidell at comcast.net>
> *Sent:* Friday, July 7, 2017 8:43:58 PM
> *To:* healeys at autox.team.net
> *Subject:* Re: [Healeys] Vernier timing gears
> My builder said it took several degrees of adjustment--dunno which
> direction--to get my DWR1 cam dialed in to DW's specs.
>
> Bob
>
>
> On 7/7/2017 7:39 AM, David Porter wrote:
> > ...assuming that the gears and chain and tensioner are up to snuff,
> > exactly what is the big benefit for vernier adjuster when there is a
> > single cam acting on the valves.. dp
> >
> >
> > On 7/7/2017 4:05 AM, Chris Dimmock wrote:
> >> Hi Wayne,
> >> >From a quick internet search on the head markings of your "aviation
> >> bolts" they are at best approx grade 5 (120 KSI) equivalent, cad
> >> plated steel bolts. Nothing special. The Rollmaster bolts you have
> >> shown look to me like grade 8 (150 KSI) unbrako style cap head bolts.
> >> The Rollmaster Vernier timing kit tells you at least 3 times (on the
> >> packaging, and in the instructions) to Locktite these bolts.
> >> If I was going to change these bolts, I'd go up to 180 KSI ARP bolts,
> >> not down to grade 5 120 KSI bolts.
> >> Our Healey Club (AHOC NSW) sells the Rollmaster Vernier kits and we
> >> have had no issues reported.
> >> Bob Spidell has recently had this timing set installed in his newly
> >> rebuilt engine.
> >> Best
> >> Chris
> >>
> >>
> >>
> >> Sent from my iPhone
> >>> On 6 Jul. 2017, at 1:43 am, Wayne <waschu2 at gmail.com> wrote:
> >>>
> >>> 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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--
Dave Porter Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM
87107 505-352-1378 Go HERE: my world www.porterbikes.com/
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