Rick and Eric,
I believe the term 3/4 cam came from the old racing days
(40's-50's) referring to "Hot-Rod" Ford flathead V8 engines.
"Full Race" being the hottest cam developed in those days
and not being very streetable.
Backyard hobbyist terminology in those days not as sophisticated as today.
Kirk
----- Original Message -----
From: "Eric Wilkins" <wilko2@cox.net>
To: "John Soderling" <jsoderling@astound.net>
Cc: "Healey List" <healeys@autox.team.net>
Sent: Wednesday, June 02, 2004 12:02 PM
Subject: Re: Works Rally cars & Cam Questions
> For the first question, I'll be adding a section to my website that
> will cover various works rally specs as my car is a semi attempt at
> making a rally performing car.
>
> Second question, I hear that term 3/4 used from time to time. I'm
> pretty sure it is a a general term for a cam that is ground to be more
> aggressive than stock, yet not as aggressive as a race cam. 3/4 of the
> performance maximum.
> For a Healey that could mean most cams ground for higher lift and
> slightly longer duration. The BJ8 cam is the best stock cam that was
> used and in the case of a 100 Six the BJ8 cam could be called a 3/4
> grind.
> I've got a reground cam that is higher lift of .425" and longer
> duration of 260 degrees. That would called a 3/4 cam too. Factory for a
> BJ8 would be .3145 lift and 252 degrees duration.
>
> Rick
> San Diego
> ewilkins.com/wilko
>
> On May 28, 2004, at 9:28 PM, John Soderling wrote:
>
> > Two questions:
> >
> > 1. Does anyone know of a website that lists the usual features of
> > the BMC Austin Healey works rally cars?
> >
> > 2. Can anyone explain to me or point me to a website that explains
> > what a 3/4 grind cam shaft is and how it differs from a stock
> > grind?
> >
> > Thanks.
> > Vrooom vrooom,
> > John
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