Chris,
If we look at NASCAR engine builders, the trend for "Speedway" type engines
is big bore and short stroke. This is true not only for the rotating
assembly but also for the valve train. Yates now uses 2.0 and 2.1 rocker arm
ratios to reduce reciprocating movement. Obviously the other major engine
theme is moving combustion air in and out of the chambers, hence the newer
SB2 Chevy head that is similar to the Yates Ford head.
I have several 2:91 ring and pinions. $115 each and in really great shape.
If you need a complete third member call me and I'll build you one. I ran a
2.91 this year at Maxton and may again next week. (i ran a 2.75 at B'Ville)
Grib
----- Original Message -----
From: "Chris R Harris" <yesford@clear.net.nz>
To: "Dave Dahlgren" <ddahlgren@snet.net>; "rgribble"
<rgribble@carolina.rr.com>
Cc: <land-speed@autox.team.net>
Sent: Wednesday, September 19, 2001 7:04 PM
Subject: Re: Decision Dilemma
> Dave,
> Interesting analysis of Bob Gribble's engine options. I would be
interested
> in what you consider an ideal bore to stroke ratio and similarly an
optimum
> rod length to stroke ratio and the reasons.
>
> I am presently considering changing my own combination especially in the
> bore to stroke area in order to unshroad the valves with a bigger bore.
>
> Grib,
> Odd request to you or any other List member, I'm looking for a rare Ford
9"
> gear set. Ratio is 2.91 to 1. Can be new or used, Wots out there
> guys ?
> Chris Harris....................NZed.
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