Decreased percentages of nitro richen the racing engine.
We made a full pass. Picked up 3 tenths of a second and about 7 MPH over 9% nitro. It was a rush. The engine is louder. And more radical. We are still making enough engine heat at idle to keep the oil dilution minimal. We are on our 16th pass on the same oil […]
We dropped the AFR to 3.2 The idle went up by 300 RPM over the 9% setup (with no idle adjustments).
With a small increase from 6% to 9% nitro, in preparation we dropped the AFR to from 3.7 to 3.4. As a result, we picked up a tenth of a second and about 4 MPH over 6% nitro.
We added port nozzles and put about 60% of the fuel into the ports.
Just a note about our test engine for this year. We put our blown alcohol engine back together for nitro testing this year.
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?