GM used 3 long 8mm bolts to hold the compressor on.raygreenwood wrote:Very nice to know Pile!....I will back read to see what compressor you are using. I have also though about making the primary four shroud bolts 10mm....just to make sure load is no issue.
The overhead fan unit I am working with will probabaly use an evap unit from a mk 4....good and easy to come by.
The overhead unit I am designing will have welded tabs to sit on the internal rails under the headliner....bolted in place. The 412 is ideal for overhead....huge overhead space...rails/flanges to mount on.....and I have had underdasb units from the factory. There is too much under the dash that needs regular service to use them on this car. Ray
My mount is total overkill, but I don't have to worry about it.
It would probably be better to use a modern spring loaded idler for belt tension.
I think the 4 rib I used is for a Dodge Neon or something, you'd want to match tension to belt width.
If I ever redo the exhaust to be a forward exit, it may grow a dry sump pump under the AC compressor.
Currently I'm more concerned the centered 10mm jack bolt will dig a hole in the mag.
(seemed like a good idea at teh time, and the end is radiused and polished)
I could ~easily make the lower bolts the jack bolts, with a pair of locknuts (inner/outer)...
MUCH easier access too.(will do that next weekend if I remember)
I considered putting 8mm timeserts in the mag fan housing, but will defer that until its an actual issue.
I used bolts with plenty of length/good engagement.
I figure if the T4s came with the big old York single lungs, the modern 5/7 cylinder compressor kicking in would be like a bug hitting the windshield by comparison.
When I turn it on/clutch kicks in/out at full AC load, you can hear/feel something happened, but it's not really enough to disturb the idle speed.