----- Original Message -----
Sent: Thursday, June 14, 2001 9:17
AM
Subject: [VAC] Re: Vintage Puller
Something you may want to consider down the line a bit is
adding a water injection system to the Carb. See here for some quick info: http://better-mileage.com/water1.html.
I actually installed a setup similer to this on a 390 equipped late 70 ford
truck, I could tow a trailer up uphill and if the engine started to ping at
all going up, all I had to do was flip a switch on the dash board and, wah-la
the pinging went away, this also improved gas mailage to some degree.
Just some thoughts.
bobb
Bob Kiger wrote:
My approach is going to be to put on
the exhaust and then take the puller into the carb guy with one
mandate. Do everything to fuel flow and vacuum to increase gas
mileage. He is a wiz and has already told me that he will set the carb
on the margin to get a couple of miles more per gallon. That might
reduce performance a bit, but as I mentioned the truck is so hot at the low
end that I could sacrifice a little performance.
The numbers are staggering in terms of operating
costs. Even 1mpg is 10% increase in fuel economy. I would not be
pursuing this if I had a modern puller that was getting 20mpg or just a
regular passenger car with 25+mpg. I am still aiming for 14-15mpg and
will know by next week.
Thanks for all your advice.
Bob
At 04:54 AM 6/14/01 -0500, you
wrote:
Bob,
----- Original
Message -----
From: Bob Kiger
At 05:59 PM 6/13/01 -0500, you wrote:
Dual exhaust
systems will improve high rpm horsepower, but in some cases, will
reduce low speed torque.
> Why
is this Harvey?<
I can't remember the details sufficiently to provide a
convincing explanation; the thought comes from books and magazine
articles I have read on building and dyno testing performance
engines. I think it is because of the scavenging effect of
increasing exhaust flow that leans the incoming fuel air mixture because
of more complete removal of the exhaust gasses from the prior power
stroke. It is a known fact that gasoline engines such as small
block Chevys used in pickup truck engines have smaller intake and
exhaust valves than high rpm horsepower engines used in Corvettes,
Camaros, etc. for the same reason.
>Hope I can prove you wrong on the gas mileage
thing. Only time will tell.>
I hope you can also but I must have read 100 test
articles on those old trucks back in the '60s and '70s, some factory
stock and others testing aftermarket products advertised to improve
performance and efficiency. I have never read of one that attained
much more than 10 mpg in documented testing.
Harvey
1966 Airstream "Safari" WBCCI
#2857
1966 Ford F-250 "Camper Special"
Mira Mar Mobile Community
Oceanside, California
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