Hey guys, I fabricated up this bracket to put a AC compressor on this dodge flathead 6, Problem is, I'm not sure if there's enofe contact on the crank pulley and belt, What do you think ? Thanks .... PS, its kinda hard to see in the picture, but I couldnt put the compressor any higher, or closer to the engine due to the exhaust.
I disagree. That belt should have around 100º of wrap to effectively drive the compressor. Plus you have the alternator and fan/water pump on the same belt. Not going to work effectively. Two belts are needed here, at least. One should wrap 'round the crank/fan/compressor, the other: crank/fan/alternator. Cosmo
hey gimpyshotrods, im not sure about the 6-bolt pulley, id like to find a dubble belt pulley. or build a iddler.
I would poke around. I have seen 2-3 grove crank pulleys, with dampers even, on these. It looks like you have an early hand-crank crank hub, which predates my DCPD knowledge.
I also think more contact would be good, can you add some type of idler pulley to reroute it a bit, or change brackets a bit? maybe move the alternator up? and/or consider multiple groove pulleys as others said
Is that one of those Gates PoweRated® green wrapped belts? Does the size include a number like 3L, 4L, 5L? I like them for garden equipment etc that provide clutch action by slipping until tightened by a spring loaded idler. But Gates rates their power capacity as a grade or 2 lower than real cut and cogged automotive belts. http://www.gates.com/ptpartners/fil...cuments_module&file=V-Belt_Brochure_16700.pdf to get an idea how much HP you can transmit I'd take the belt section size, crank pulley diameter and 2000 rpm and compare it to the tables starting on page 22 here - http://www.gates.com/catalogs/file_...DriveDesignManual.pdf&thisPath=gates/catalogs The de-rate for contact less than 180 degrees is on page 205. There is also a de-rate for ebing driven by an engine and not an electric motor. (Yeah, I think you probably need a double or triple groove crank pulley)
Looks like it'd be pretty easy to fabricate an idler to mount on the engine cradle between the crank pulley and compressor. And if possible, another between the fan and the alternator would give you more wrap on each of the four pulleys.
Hey Dan, thanks for that info, Im not sure about the belt, my customer bought the belt, but Im gona point him to this and let him give it a read.. yea Ebb, Im kinda thinking about the iddlers,
Maybe put a double pulley on the water pump. Run one belt from crank to water pump to alternator. Other belt run from water pump to AC. later jim
not sure if they made a double belt pulley for the water pump for this ol thing jim. but another good idea, thanks
Yeah like I said...and the other hambexperts agreed....idler pulley of some type......I am sure between everyone here we will get it sorted out....this really is the best forum going
man, this is the best forum going... yea, Im going to the wrecking yard to look for some sort of iddler.
I think you could go to a double pulley pretty easy by finding a three hole pulley and just over laying it on the 6 hole and drill the extra 3 mounting holes. A 2nd pulley would work better to separate the accessories with two belts, and get the contact area needed to properly drive everything. I bet a trip to the junkyard with the lower pulley will discover something in a three hole that matches up.
I like the sound of that too 1971BB427....separating into a couple separate belts also is a good idea....maybe if he gets a pulley that is even close, can have it machined at a local shop so if the center hole was too small or something...or re-drill the face for a different bolt pattern if all else looks like a perfect fit
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