Originally Posted by liv2mx
my 42's are 95 pounds a 17" 43 weighs 121. almost 30 pounds difference in a steel 17 versus a aluminum 20" rim. so 55 pounds or more difference in a steel 17 on a 43 versus the 42 on a 20.
Did you weigh the wheels?
I don't doubt the difference, 55lbs of rotating mass * 4 wheels * gear reduction equals a lot of horsepower. I know I could feel the difference in throttle response when I put the 9lb flywheel weight on my 2.5L YJ...it was awesome for crawling but trying to tackle a long hill with an SM420 (think bread truck) was an exersize in futility.
Seems the game you're looking to play would be best played with the lightest possible wheel/tire combo (within durability reason), otherwise you'd have to jump tax brackets in the motor department.
'46CJ2A, '47CJ2A, '48CJ2A, '50M38, '52M38A1, '62CJ3B, '62CJ5, '65CJ5, (2) '66CJ5's, '67CJ5, '67CJ101 '69CJ5, '69J3000, '70CJ101, '74DJ5, '73CJ5, '74CJ5, '77CJ5, '78CJ5, '78CJ7, '78Waggy, '83CJ7 (2) '95YJ's, '97XJ...One of them runs, kinda.