Great Lakes 4x4. The largest offroad forum in the Midwest - View Single Post - Smog pumps or not, real world question, 1986 E-350 chasis
View Single Post
Old June 9th, 2011, 01:42 PM   #8
ScOoTeR
hoo dat. wat.
 
ScOoTeR's Avatar
 
Join Date: 11-09-05
Location: Howell
Posts: 21,479
iTrader: (35)
Mentioned: 6 Post(s)
Default

Quote:
Originally Posted by osteologation View Post
So y is it that smog pumps are so uncommon. My bronco and 1983 delta had one but the other 20 cars I've had have not. Just seems like something that isn't needed now that engines/efi are of more efficient design.
Not true - many cars have air pumps on them even now!

The big difference is that they are electric and only run for the first 20 seconds or so after startup. Back then, it used to be about reducing emissions from poor fuel control with shitty technology cats -

NOW, it is all about getting the super-efficient cats up to operating temperature as fast as possible. One car I'm do some work on gets center catalyst temperature to 700C IN 20 SECONDS. The sooner you are hot, the quicker you reach your best catalyst efficiency.
__________________
@clarkstoncracker
ScOoTeR is offline   Reply With Quote
 
Page generated in 0.04699 seconds with 20 queries