I heard that holbay originally delivered the H120 powered rapier (or
hunter?) with decent sized ports and rootes said... "No way. this is too
fast, make it slower". The reduction in port size was holbays answer. I
thought they only reduced the size of the intake manifold runners, and the
head ports were standard, but I may be wrong here. Would take a lot of work
to weld up the ports and re bore them.
more information form vague sources.... The original engine did put out
120hp, but the port mods reduced it to about 107.
Kindof defeats the purpose of the webers in the first place, but it was more
of a sales gimmic anyway, as a result of the london-sydney win.
Greg
----- Original Message -----
From: Jarrid Gross <JGross@econolite.com>
To: Tom Hill <tom.hill@att.net>; Christopher Albers
<Christopher.Albers@bubbs.biola.edu>
Cc: <alpines@autox.team.net>
Sent: Friday, 9 March 2001 09:02
Subject: RE: RE: More Power from the 1725
> tom wrote,
>
> >I am referring to the port diameter at the intake manifold not the valve
> >size. I think the valves are the same on the standard and Holbay heads.
>
> >tom
>
> CNA wrote,
>
> >Huh? That doesn't seem right. How does the head breath with an intake
> >only, what, 1.2"? I can't recall the stock size, I seem to recall
> >about 1.4" for the intake & 1.2" for the exaust.
>
>
>
> This is correct, the ports on the holbay are about 1.25.
>
> The valves are 1.30 and 1.52, the same and SV alpines.
>
>
> Jarrid Gross
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