roots blower difference

A top fuel blower is NOT a high helix retro blower but is considered to be a standar blower. A standard blower has 60* twist to the rotors and dumps the air directly out of square holes under the rotors. A high helix retro blower has 120* twist to the rotors and dumps the air out of a pie shaped opening in the front part of the bottom of the blower. It takes a lot more horsepower to drive a standard blower because more air is trying to push itself back up through the rotors from underneath and that creates heat and uses up horsepower. High Helix retros need less horsepower to run, make more boost and have a cooler air charge. My recommendation is to use a high helix retro for alcohol and not a standard blower.

 

No arguement there on the fact that nitro fuel cars like a hot air charge which is totally opposite us.

PSI screw blowers and high helix retros are both banned from Top Fuel classes.