Smokin 5000HP+ Posting Maniac
Join Date: Feb 2009
Location: Saudi Arabia
Big Blocks And Air Conditioning
Are any of you running big blocks with air conditioning? And if so do you still have your smog pump going? If not then you should have it going because the smog pump and it's belt play a vital role for those cars with air conditioning.
Shortly after I got my '71's air conditioning going I took a trip to Fresno with the air conditioning on and by the time I got there my alternator belt had burned up. Burned up so bad my fan was barely turning and my a/c compressor had come to a complete stop.
Looking the situation over after I got back home I realized the compressor was driven off the water pump pulley only as the belt didn't go around the crankshaft pulley like it does on a small block. My smog pump and it's belt had been removed by a previous owner and without it operating the only belt left to power the water pump, fan, alternator, and compressor was the alternator belt. And that's why it burned up. Way too much load for a single belt.
So I realized I needed to put a belt in the empty rear pulley grooves and use an adjustable idler pulley to tension it. I bought an idler pulley off a 1970's Chrysler product then fabricated a mount bracket with a means of adjusting the pulley. Now the new idler belt provides 50% of the drive power and the alternator belt provides the other 50%.
I had tried to post pictures of my new idler pulley but for some reason it wouldn't accept them. So I'll try again later in the day....................
Last edited by toobroketoretire; 05-05-2012 at 01:37 PM.