compression releases
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Cruiser
Joined: Mar 2008
Posts: 112
Likes: 1
compression releases
Bought a 2012 Street Glide. The 103 " motor comes with compression release valves. I am wondering if any one has had any problem with them sticking open or other problem. Seems like something not needed. I know they can be disabled with turner. Should I do this.
I would not disable them..You probably would like to keep the starter and the ring gear intact as well as a few other goodies..
Club Member
Joined: Jun 2009
Posts: 5,323
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From: NJ
Some hot day in July when you been running for hours and pull over to get a soda and shut down for 5 minutes you'll need them. Your motor will get heat soaked and without them she would sound and feel like a horse gasping deeply for air when you try to crank her over. With them you'll fire up np. Sort of not missing something till it's gone sort a thing. Leave them be.
Stellar HDF Member
Joined: Feb 2010
Posts: 3,121
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From: sunny florida
your out on the road staying in a hotel , cold out , you get up the next morning , temperature zapped your battery a little , with them you start , without them your looking for a jump
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Cruiser
Joined: Mar 2008
Posts: 112
Likes: 1
My last bike was 07 SG was a great bike compression was 9.2:1 This new 12 SG is 9.6:1. There is alot of bikes with head work over 10:1 no releases. I thougth 10:1 is not high, is that correct. I'm also thinking if the compression releases stick open with carbon or something that it can really do damage. Thanks for the come back
Outstanding HDF Member
Joined: Jan 2008
Posts: 3,328
Likes: 15
From: Pacific Northwest
9.6:1 compression shouldn't need compression releases. Been running 10.5:1 in a 95" motor for 3+ years and have never had any starting issues without them. Been wondering why HD elected to run those things on a stock motor.
Maybe someone else here has the answer.
Maybe someone else here has the answer.
what's your corrected compression? If you're running a late cam, your cranking pressure could be lower than a stock motor.
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Outstanding HDF Member
Joined: Jan 2008
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From: Pacific Northwest
Mine's 9.8:1, corrected. Plus I have a bud that finally trash canned his stock automatic releases on his 110 CVO ('07) because they never ever worked correctly. To their credit, his dealer tried many times to get them to work but they never got them to any dependable level so he $hit-canned 'em. He's since done even more motor work than me and doesn't miss those problematic releases one bit. He runs a true 10:1 and has never needed any compression releases either.
Last edited by Leftcoaster; Jan 5, 2012 at 12:13 PM.