A good book to read is..
Modern Engine Tuning
By
A Graham Bell.
Haynes sell it.
He explores a whole range of factors and gives results of tests done to each change in the engines. Showing things like power changes over various rev ranges for the various trials.
It also has a section blowing away some myths/claims about gadjets and " snake oil remedies".
Quite an interesting book
It has a section on air filters that covers tests of various brands, also design mods to help air input, both more air and also air velocity.
Worth a read.
He confirms all of minikeefee's comments and shows actual test results.
Last edited by sospan; 07/05/15 01:15 PM.
