its becuse they have larger wind caching area. on our trucks we cant use that large radiator. our only option is to make it thicker. radiators work better when they have larger wind catching face. on chevy tyucks its 3 core but 40+ inches long and 30+ inches high. on our trucks its about 18 inches high and 24 inch long.
in general disel motor does not get hot all the way during idle or normal street driving, but when it comes to goin hard up hill then it gets really hot. much more than gas engine . thats the problem we are dealing with.
remember our engine bay is not made to handle 6.2 diesel large motor. thats why we have to make it work using funs.and larger radiators
but if they can cool off >>nucliar power plant << then for sure we can make 6.2 diesel motor run cooler
ERIC
ac delco is also very good t stat. do u have a cooling fun in front? or a fun shroud inside? what setup do u have?
ERIC
Right now it's just direct drive fan off the main pulley. The fan is small and I can't go bigger because it'll hit the frame crossmember. No shroud.
This week I'm going radiator shopping.
6.2 guys are saying with headers they're seeing up to 2mpg more... but I gotta fix my heat problems first.
NO DONT CHANGE YOUR RADIATOR YET. get a nice electric fun with fun shroud,(the one from ford crovn viky) is very large and strong. or from the volvo. and ad another elecric fun in front. it will give u 50% more cooling power, why do u wanna spend 500 or more bucks when u may not need to
fun shroud alone will give u 25% better cooling.
ERIC
i remeber in one of your d1 pictures u had a nice aluminum radiator. did u get rid of it?
the radiator i have is 500 bucks. but fits right in place.