Regarding Fuel Injector Improvements for Normally Aspirated Stacker Engines We were recently asked about fuel injection nozzle design. It got me thinking about several responses throughout our technical manuals and other racing experiences.
Mr. Szabo Just an update on my 572. Went to the dyno and made 968 hp, 833 lbs/ft torque. This is with Ron’s Terminator, a 01/2 twin gear pump, .037 nozzles, and a .102 main jet. Air/fuel ratio was 5.3. I was pleased! The information in your books was very helpful and allowed me to […]
We used a simple fuel pressure gauge with a peak hold needle to record our highest fuel pressure value from a run. The gauge is an all stainless, bottom 1/4NPT pipe, glycerin filled gauge with a maximum indicating needle. Glycerin filling is needed to dampen the needles from racer vibrations. Stainless is needed for resistance […]
Different designs of inlets and outlets dramatically effect the performance from Roots superchargers. Original designs for non-boosted flow used large inlet and outlet openings. Shrinking those openings for boosted flow improved performance by reducing reversion
E85 is examined as a racing fuel. E85 is a combination of ethanol and low octane gasoline. Some racers report more power from E85 than from methanol. On the other hand, when the Indy Car League converted from methanol to straight ethanol, dynamometer tests revealed a reduction in power after the conversion.
Lastest from a reliable dyno source is about 80 horsepower per psi of boost added from ram air.
Racing class rules put compeditors on the purchasing race to buy the latest parts within the rules, and those parts are often expensive. The economy is disabling more competitors in that race. So we looked at No-Rules Outlaw engine combos for more power without expensive parts.
note: This is a continuation of a previous article on Air Scoop Size. In the article in our freebies section entitled Air Scoop Size, an example of a 3,400 CFM blown engine was analyzed. The discussion of that value is continued to illustrate the very large amount of air used by a race engine to […]
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In our AIR SCOOP SIZE article from “Freebies” on our web site, a vehicle MPH speed (called critical air scoop speed in our methanol book) is introduced. It is the vehicle or vessel speed where the air going into an air scoop matches both the speed of the racer and the air consumption of the […]