The determination of nozzles & jetting in a new fuel injection setup can be a challenge. (more…)

A lot of pit buz that cooler fuel runs better.

METHANOL VAPOR ISSUE: We found in our methanol publication development that only methanol vapor burns. (more…)

We added port nozzles and put about 60% of the fuel into the ports.
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I had an interesting email exchange with a very knowledgabel and astute racer that I thought I would share. I’m happy to see he noticed the differences:

I noticed an error in the “Superchargers for IHRA” article…

“One way of looking at where all of that power came from is to look at the
displacement of the blower. The 6-71 displaces a little over 400 ci per
revolution (6 x 71 ci).”
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You can download a 6 page index of terms from “5000 Horsepower on Methanol”. You can also download an index of names from this publication as well. Check the shopping page.

ALREADY AN OWNER: These indexes will help to find page numbers for various topics in the manual; such as octane, nitro, temperature, air to fuel ratios, and many others.

CONSIDERING A PURCHASE: These indexes reveal the extent of coverage and the broad range of topics throughout the publiication.

The racer is one step closer to setting up a tuning plan for density altitude like we wrote about throughout our technical manuals; the racer can log onto www.airdensityonline.com and get current air density and density altitude for many race sites throughout the US; (more…)

In our drag racing, we did use air to fuel ratio as a controlled value to get the engine into a linear range. That task is an extensive explanation through out writings. The linear range is where the engine is completely predictable. We achieved that very well in our racing. (more…)

QUESTION: Do any of your books help in areas of tuning with using O2 sensors? I am needing some what of a baseline for a good tuneup using the correct nozzles, pills to help with getting the most or should I say most consistent in drag race ET’s. Of course everything being the same.

Thanks for replying, R. in Texas

Hi R in Texas,
Thanks for your inquiry. Our Jetting for Racing Mechanical Fuel Injection … book has info on O2 sensors including accuracy limits.

REPEATABILITY VS ACCURACY: O2 sensors are a great tool, however, the accuracy (especially for methanol or ethanol) and repeatability may be issues. Accuracy is less of an issue if they are repeatable. (more…)

A blown nitro ford combo was reviewed that was run for a year with no breakage, no burned pistons, and no other problems associated with nitro. An extensive analysis tech info may follow if there is interest. Let us know.

Question: Effect of lowering blower overdrive?? More or less power?
Bob?s answer: A trend now is gearing the blower to the racetrack. That is done with rear end gearing, tire size, shift point, and blower overdrive. Adjustment of any of those will change the speed attained by the blower at the end of the drag race or the straightaway.
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