Auto Compression Release
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Road Master
Joined: Jul 2009
Posts: 1,221
Likes: 9
From: Monmouth, OR
Auto Compression Release
I understand the benefits of the auto compression releases, just a bit confused on when they're needed.
When I upgraded my Fat Bob to the 103 Stage II, I asked about adding them, and the tech told me they weren't necessary on the 103 Stage II. Got the bike back, never had an issue.
Now I see they're coming on the 2010 103's (w/o cams) with them already installed. Is that really necessary? Is it just peace of mind? I'm getting ready to upgrade my 2012 to 103 Stage II and I want to make sure I'm not tempting fate by not adding them.
When I upgraded my Fat Bob to the 103 Stage II, I asked about adding them, and the tech told me they weren't necessary on the 103 Stage II. Got the bike back, never had an issue.
Now I see they're coming on the 2010 103's (w/o cams) with them already installed. Is that really necessary? Is it just peace of mind? I'm getting ready to upgrade my 2012 to 103 Stage II and I want to make sure I'm not tempting fate by not adding them.
Last edited by sanlyn; Oct 25, 2011 at 05:04 PM.
Club Member
Joined: Jun 2009
Posts: 5,323
Likes: 37
From: NJ
Wouldn't say there a must have but you'll probably notice on a hot day with a hot motor 103 and upwards have occasional difficulty turning over with ease. Compression releases help that process. In bigger motors perhaps 110 and up I can see them being a must have item.
If your going to do cams anyway take a look at S&S easy start cams. In short they allow a valve to stay partially open on crank up allowing compression to be reduced for the moment until she fires up.
If your going to do cams anyway take a look at S&S easy start cams. In short they allow a valve to stay partially open on crank up allowing compression to be reduced for the moment until she fires up.
HDF Community Team
Joined: Jun 2006
Posts: 12,763
Likes: 2,597
From: san antonio
When cranking compression gets up north of 190psi, compression releases are nice to have and will extend battery and starter life. The closer CCR gets to 200psi, the more important the releases become and anything above 200psi should definitely have compression releases. I have seen a crank shift as the result of a nasty heat soaked kick back on a hot summer afternoon. If the guy had CRs, no problem.
As an example, if you upgrade to 103 Stage II with SE255 cams, your cranking compression will be about 198psi, definitely CR territory. However, if you install say the Woods 555, static compression will stay at 9.8 but CCR will drop to 185psi and you could get by without CRs.
As an example, if you upgrade to 103 Stage II with SE255 cams, your cranking compression will be about 198psi, definitely CR territory. However, if you install say the Woods 555, static compression will stay at 9.8 but CCR will drop to 185psi and you could get by without CRs.
Tourer
Joined: Apr 2010
Posts: 461
Likes: 4
From: Yale, MI
I would just get manual cpr's machined in. The ACR's you need a wire harness (60.00) and if you don't have the SERT you will have to have the dealer turn it on in the ECM for you. same price as a stage 1 download. 100.00 min
I'm working on a timer and a wiring harness that will work off the starter relay for the ACR's on my bike. "FTF"
I'm working on a timer and a wiring harness that will work off the starter relay for the ACR's on my bike. "FTF"
Ultimate HDF Member
Joined: Jan 2008
Posts: 6,532
Likes: 132
From: SoCal
His sig lists his bike as a 2010 but posts he has a 2012.......hmmmm
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Road Master
Joined: Jul 2009
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From: Monmouth, OR
I fixed the year, mine's a 2010.
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Road Warrior
Joined: Apr 2010
Posts: 1,255
Likes: 1
From: Superior, WI
I look at it as cheap insurance personally. Easier to do it when you have it all apart anyways, and if you ever change your cam down the road it's one less thing to do. That's just my opinion.
Road Warrior
Joined: Jun 2009
Posts: 1,943
Likes: 3
From: NYC
I understand the benefits of the auto compression releases, just a bit confused on when they're needed.
When I upgraded my Fat Bob to the 103 Stage II, I asked about adding them, and the tech told me they weren't necessary on the 103 Stage II. Got the bike back, never had an issue.
Now I see they're coming on the 2010 103's (w/o cams) with them already installed. Is that really necessary? Is it just peace of mind? I'm getting ready to upgrade my 2012 to 103 Stage II and I want to make sure I'm not tempting fate by not adding them.
When I upgraded my Fat Bob to the 103 Stage II, I asked about adding them, and the tech told me they weren't necessary on the 103 Stage II. Got the bike back, never had an issue.
Now I see they're coming on the 2010 103's (w/o cams) with them already installed. Is that really necessary? Is it just peace of mind? I'm getting ready to upgrade my 2012 to 103 Stage II and I want to make sure I'm not tempting fate by not adding them.
If you pull your heads for anything, might as well send the head sout for MCRs. got mine done for $125 with free shipping back to me.