----- Original Message -----
From: Cindy and Terry@ESP <esp@hypermax.net.au>
To: John Macartney <jonmac@ndirect.co.uk>
Sent: Wednesday, July 19, 2000 5:51 PM
Subject: Re: 6 cyl head mods
> Hi John
>
> Many thanks for your reply. You are the only reply with real info to date,
> which I find amazing given the interest in 6 cyl performance mods.
>
> Anyhow, the article by Witor in April 99 , Six Appeal presented 2 graphs,
> both identical. A bit confusing!!!
>
> It is not possible to properly evaluate the data on flow because Chris has
> not provided the pressure drop used.
>
> The "industry accepted" value is 10" water gauge, and if he used this,
then
> the general equation for estimating HP can be used. It is.............
>
> Peak Engine HP= 0.43 x peak port flow in CFM (at 10" WG) x no.
> cylinders
>
> Using his figures, a standard head would flow 103HP (about right) and a
> modified head with 31.25mm valves would flow 150hp, again, not a bad guess
> based on my experiences.
>
> I would like to get a copy of Witors article in Six Appeal Edition 109.
Can
> I buy a copy from the club please??. If so, I'd appreciate if you (or
> somebody else) could scan and e-mail thru the article, whilst I wait for
the
> original to come via post
>
> regards,
>
> Cindy & Terry @ ESP
>
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