Compression Release Valve for 96ci?
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Stellar HDF Member
Joined: Jul 2016
Posts: 2,213
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From: Andover, MN
Compression Release Valve for 96ci?
I just bought a 2009 Street Glide and looking at putting a cam in. I have had 2 different opinions about the need for compression release valves. Ones says yes and the other one says no.
Looking for some advice. Frist bike I've ever owned! Thanks
Looking for some advice. Frist bike I've ever owned! Thanks
Seasoned HDF Member
Joined: Jul 2008
Posts: 9,281
Likes: 1,139
From: southeast PA
It depends on a few factors. Which cam will you be using? Are you planning on any headwork or thinking of bumping the compression ratio?
I would think that with just a mild cam and nothing else you don't need a CR.
Oh, and congrats on the new ride and welcome to the forum.
I would think that with just a mild cam and nothing else you don't need a CR.
Oh, and congrats on the new ride and welcome to the forum.
HDF Community Team
Joined: Jun 2006
Posts: 12,774
Likes: 2,606
From: san antonio
If CCP is greater than 190psi, install compression releases. You also have the option of a variety of EZ Start cams from S&S which would eliminate the need for CRs.......
EDIT: What JBJ says below is true; however compression releases are cheap and with CCP at 190psi, or higher, batteries and starters are much happier and less prone to become maintenance issues. JMHO.......
EDIT: What JBJ says below is true; however compression releases are cheap and with CCP at 190psi, or higher, batteries and starters are much happier and less prone to become maintenance issues. JMHO.......
Last edited by djl; Aug 20, 2016 at 11:49 AM.
Seasoned HDF Member
Joined: Dec 2009
Posts: 9,163
Likes: 1,906
From: Doghouse... mostly
If CCP is greater than 190psi, install compression releases. You also have the option of a variety of EZ Start cams from S&S which would eliminate the need for CRs.......
EDIT: What JBJ says below is true; however compression releases are cheap and with CCP at 190psi, or higher, batteries and starters are much happier and less prone to become maintenance issues. JMHO.......
EDIT: What JBJ says below is true; however compression releases are cheap and with CCP at 190psi, or higher, batteries and starters are much happier and less prone to become maintenance issues. JMHO.......
Road Warrior
Joined: Aug 2007
Posts: 1,392
Likes: 43
From: South Australia
a lot of extra work to take heads off just to fit releases if otherwise heads are staying on...
if heads are coming off I would fit releases now and be done with it.
your battery and starter will be happier with them fitted.
if heads are coming off I would fit releases now and be done with it.
your battery and starter will be happier with them fitted.
Last edited by Tat2u; Aug 20, 2016 at 11:02 PM.
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Road Warrior
Joined: Aug 2007
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From: South Australia
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HDF Community Team
Joined: Jun 2006
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From: san antonio
You know better. IIRC, 09 OEM cam intake close is 30*; CCP about 180psi. There are a variety of cams with earlier intake close events that will make near 190psi CCP. I can't think of a cam off the top of my head that would make 190CCP and he can surely get by without releases.
I agree with Tat2U, pulling heads for releases is OTT, particularly when there are plenty of EZ start cams available for a cam change.
I agree with Tat2U, pulling heads for releases is OTT, particularly when there are plenty of EZ start cams available for a cam change.