Bob,
The water temp during the summer months runs about 175 - 185 F. I change from
the 4 blade metal fan to the 6 blade plastic fan and it really help. I
attribute the improvement to the better air flow and getting the blades closer
to the radiator to pull more air through when stopped. As for the octane, I run
the top grade Sunoco fuel. One of these days I would like to try the
supercharger on a 1275 cc engine to see what happens with the coating of the
housing and the Torlon blades.
Allen
-------------- Original message --------------
From: "Robert E. Shlafer" <pilotrob@webtv.net>
> Hi, Allen....
>
> your experience indicates your Judson
> worked out as expected on a 948. Judson
> promised a 40% increase in power (torque) with no change to the stock ign.
>adv.
> curve using the prem. leaded fuels of the time which would give about 102RON
> (Gulf No-Nox or Sunoco 260/280). I think they did recommend a possible switch
>to
> a colder
> spark plug but it's been so long since I've
> checked their paperwork that I could
> be wrong on this.
>
> The stock 948 would get the BE to 60 in 20.0secs or so your performance seems
> pretty much in the promised ballpark?
>
> Too bad there was not a Spridget Judson
> sized for the 1275. I tried the application on
> a stock 1275, and overdriven for the 6psi
> boost curve to the larger capacity motor the car went like hell on CAM2
> "purple".
>
> Couldn't sustain the 6psi boost curve with
> the reduced diameter blower pulley though...fan belt slippage around such a
> "tight" curve. And we could've used a little
> less total ignition advance as well though
> the rate of same was OK considering the
> octane of fuel we were using.
>
> Lacking the coatings you are using,
> I figured the only way to run the Judson
> with a decent ignition advance curve
> and without spending bucks on racing
> fuel was Torlon blades along with an
> alcohol/water injection or delivery system
> to be able to run the application more
> economically on today's unleaded premium pump octanes.
>
> George Folchi was supposed to go to Torlon and develop the alcohol/water
>system
> but he never did get around to it so I returned the blower for a refund
> considering it was otherwise not suitable for a 1275.
>
> Dean Hedin reported a while back that he
> could not run his Judson equipped 948 BE
> in the summer. Had to disconnect the belt and run normally aspirated. Believe
>he
> lived in Pittsburgh area where temps go to 90F+.
>
> How warm does it get in the summer at your atbode??? What octane (either RON
>or
> PON) are you running??
>
> CapBob
> '60 :{)
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