We added port nozzles and put about 60% of the fuel into the ports.
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We tested a low percentage of nitro last week in our blown alcohol drag race roadster. (more…)

Just a note about our test engine for this year. We put our blown alcohol engine back together for nitro testing this year.
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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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Received this email from a knowledgeable racer:

Crew of an A-Fuel car (nitro)
Bought all your books. Excellent reading.
However, my calculated AFR number gives unreal value. How can I make this applicable to nitro?

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