[Spridgets] Rockers

[brian S]

They've gone up a lil bit since you got them Hal. :-)

Roller tips are $241+ ship and the full roller ones from them are $475+ for
the
1.3 or the 1.5 ratio sets. Pretty decent deal.

The Doctor that Michael mentions is Dr. Marty Ferillo, aka martingf on Ebay
and owner of British starters. Very good guy. Tell him your on the Spridget
list
and he'll throw in a bit of a discount. btw, his rockers on ebay are 1.5's,
listed at $489.

While I'm no expert, ask anyone, with the cam you have, sounds like a
relatively
low lift, the addition of the 1.5 rockers will help quite a bit.
If the valves on the head I have for you are as large as I think they are,
it will breathe very well with the 1.5's.

>From what I understand, Harland Sharp's are THE ones to get.
They are the ones that the racers use and they stand behind their products.
They are $265 for the 1.347's and $279 for the 1.5's, direct from them.
http://www.harlandsharp.com/948_1275_mgb.htm
Thought they were ALOT more expensive than that, til I just looked it up.
But they don't come adjusters, and I don't think it comes w a new rocker
shaft.

Dr. Marty is a good guy, but not worth paying an extra $200 for.
Oh and stock ratio is 1.347:1 IIRC.


my .00002 cents

Brian S.
Bugeyeracer finally resto'ed!



> Date: Wed, 3 Feb 2010 12:15:15 -0800
> From: frog.aye at gmail.com
> To: mdrowe at optonline.net
> CC: spridgets at autox.team.net
> Subject: Re: [Spridgets] Rockers
>
> Michael,
> On p.321 Vizard says:
> ".... but basically we can assume that if you have a standard or near
> standard cam in in any engine, higher lift will produce higher power,
> especially in the bigger engines."  I couldn't find any specific reference
> to reduced returns above .350" but on p 323 he states, "....rocker ratios
> between about 1.5 and 1.7 are generally optimum for an effective valve
> train."
>
> You don't really give us enough information to answer your question.  What
> are the actual ratios of the rockers?  How much has your head been
> modified?  Even though the lesser rockers "slide -on" to the stock rocker
> assembly you may need to replace a worn shaft, thus negating some of the
> savings.  Do the more expensive rockers have needle bearings on the shaft
or
> are they bushed?  The use of needle bearings may push them into the area of
> "diminishing returns."
>
> I don't know who "The Doctor" is or what his rocker sets cost but there are
> savings to be had by going to the source.  MiniSpares has a set of 1.5:1
> ratio roller tip rockers for just over 110 Quid (excluding VAT) by the time
> you get them to the US that translates to somewhere around $200. That
> includes rockers, shaft, pillars, and adjuster screws, i.e., everything you
> need to get them on the head.  They are bushed at the shaft so you aren't
> paying for that last .001% that needle bearing rockers get you.  By all
> means purchase as much as you can from your local supplier or somebody on
> the list, but the price difference for some items makes it almost foolish
> not to go to the source.
>
> Hal
>
>
>
> On Wed, Feb 3, 2010 at 10:29 AM, Michael Rowe <mdrowe at optonline.net> wrote:
>
> > Two sizes of roller rockers are sold by "The Doctor."  With my cam, one
> > provides 0.347" lift and the other provides 0.392"   The former cost half
of
> > the latter because they are slide-ons for the stock rocker assembly.
Vizard
> > shows relatively little improvement in performance for valve lifts above
> > 0.350" and my machinist points out there is little sense in higher lift
if
> > the head can't breath enough.
> >
> > What are your thoughts on choice of rockers for a "warm" 1310 street
> > engine?
> >
> > Michael Rowe
> > Aspiring engine builder
> >
> >

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