Testing Harley ACR
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Stellar HDF Member
Joined: Aug 2006
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From: Hurdle Mills NC
Testing Harley ACR
The harley tech told me that he tests ACRs with a battery. But .. he wouldnt tell me how to do it.
Does anyone know how to bench test an ACR using a battery ?
Does anyone know how to bench test an ACR using a battery ?
Stellar HDF Member
Joined: Jan 2017
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From: Massachusetts
You could always use a compression gauge and try the test with acrs plugged in, and then unplugged. Obviously, a significant change in compression will tell you if they are in fact functioning.
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Joined: Apr 2016
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From: Masshole
Don't know if true or not but the shop I use told me ACR's only operate during fuel pump prime and are only effective during first crank over. Made to get rid of any residual cylinder pressure. Makes sense tho as even manual compression releases automatically close once pressure is built up.
For testing, you can listen for the click, but that only tells you they are opening, not if they are plugged, fouled, whatever. Better way would be with a compression tester. Put one in, crank a few cycles, turn bike off for a few, then just turn the ignition/run switch on and see if the residual compression is released.
Quite a few forum posts here on them:
https://www.google.com/search?q=test...&bih=744&dpr=2
For testing, you can listen for the click, but that only tells you they are opening, not if they are plugged, fouled, whatever. Better way would be with a compression tester. Put one in, crank a few cycles, turn bike off for a few, then just turn the ignition/run switch on and see if the residual compression is released.
Quite a few forum posts here on them:
https://www.google.com/search?q=test...&bih=744&dpr=2
Thread Starter
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Stellar HDF Member
Joined: Aug 2006
Posts: 2,152
Likes: 406
From: Hurdle Mills NC
Don't know if true or not but the shop I use told me ACR's only operate during fuel pump prime and are only effective during first crank over. Made to get rid of any residual cylinder pressure. Makes sense tho as even manual compression releases automatically close once pressure is built up.
For testing, you can listen for the click, but that only tells you they are opening, not if they are plugged, fouled, whatever. Better way would be with a compression tester. Put one in, crank a few cycles, turn bike off for a few, then just turn the ignition/run switch on and see if the residual compression is released.
Quite a few forum posts here on them:
https://www.google.com/search?q=test...&bih=744&dpr=2
For testing, you can listen for the click, but that only tells you they are opening, not if they are plugged, fouled, whatever. Better way would be with a compression tester. Put one in, crank a few cycles, turn bike off for a few, then just turn the ignition/run switch on and see if the residual compression is released.
Quite a few forum posts here on them:
https://www.google.com/search?q=test...&bih=744&dpr=2
Yep. Understand what they are and how they work. Want to know how to bench test them.
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From: Masshole
ACR----Compression gauge-----air source (Schrader, quick connect, etc)
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Joined: May 2021
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From: Somewhere HOT! 🥵
with ACR I've front giving 25psi lower than the rear. with ACR disconnected, both front and rear giving same psi. possible that one of the ACR opening more thus bleeding off more pressure? or one of the ACR is not opening as much thus higher psi?
Tourer
Joined: Jan 2021
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From: Arizona
I put 103 heads on my 96 and added the SE ACR's, so I wanted to check that they were working.. I compression tested them, then unplugged them and checked them again. It was a 50 psi difference, so I figure that they are working.