Originally Posted by rottenralph
Is an HEI coil a good adder to my new 65 mustang. I had a mustang several years ago and put a Mallory Unilite on it but since then HEI distributors became much more affordable. My questions are as follows.
1. Is an HEI Distributor going to add to the driveability ofthe car?
2. Does an HEI distrb. improve gas mileage?
3. I there a particular brand I should buy and brands I should stay away from?
HEI is intended to do 2 things, the first is to light off lean emissions mixtures at idle, or in other words reduce miss-fires that cause high levels of unburnt HC emissions. The second thing is to meet Federal and California requirements for Mean Time Between Tune-ups, or remain stable and effective in the face of little to no customer maintenance of the ignition system and spark plugs.
Fuel mileage will not be effected unless your current system miss fires enough to result in poor or missed burns which results in unused energy going out the exhaust instead of providing a push on the crankshaft.
The brands of conversions and replacements on today's market are all sufficiently good for a street engine. The big thing it buys is freedom from points and condenser replacement.