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AC Compressor Pulley Size by Riney
Started on: 01-29-2025 07:03 PM
Replies: 2 (47 views)
Last post by: Riney on 01-30-2025 05:33 PM
Riney
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Report this Post01-29-2025 07:03 PM Click Here to See the Profile for RineySend a Private Message to RineyEdit/Delete MessageReply w/QuoteDirect Link to This Post
I have an 84 with a 2.5 . The original accessory drive system is a v belt with the alternator and water pump running off a single belt and the A/C running off a single belt. With this set up the inside (back) crank pulley has a larger diameter for the alternator and water pump . The outside (front) crank pulley that runs the A/C has a smaller diameter and the A/C compressor pulley is 4.9" in diameter. This is what is on it now.

I think I may want to change the set up to the later v belt system that has one belt running the alternator and water pump and one belt that runs the A/C and water pump. This way I will have two separate belts running the water pump. I do have the correct double crank pulley and the correct double water pump pulley to run this type of system.

The HR 6 A/C compressor, which is brand new, has the small 4.9" diameter pulley. My research shows that a 5.7" diameter pulley on the the A/C compressor was used on the system that two belts running the water pump and it think this is because of the larger crank (drive pulley). If convert this the system over and keep the small A/C pulley i know the compressor will be turning faster that what the engineers designed it for.

My question: Can I run the A/C compressor that has the 4.9" pulley with the larger crank shaft pulley?
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RWDPLZ
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Report this Post01-29-2025 07:16 PM Click Here to See the Profile for RWDPLZClick Here to visit RWDPLZ's HomePageSend a Private Message to RWDPLZEdit/Delete MessageReply w/QuoteDirect Link to This Post
As long as the v-belt pulleys line up properly, it should be fine. The compressor doesn't need to run at an exact speed to work, and will vary wildly with engine rpm. 1 belt will run a new HR6 compressor.
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Riney
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Report this Post01-30-2025 05:33 PM Click Here to See the Profile for RineySend a Private Message to RineyEdit/Delete MessageReply w/QuoteDirect Link to This Post
Yes, all the pulleys are factory stock so they will line up. If my math is correct the AC compressor will be spinning around 13% faster than before so i just wanted to make sure that would not be an issue at higher RPM's

Thank you for the feedback.
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