Compresion releases ???
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Road Warrior
Joined: Nov 2009
Posts: 1,330
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From: Las Vegas Nevada
Compresion releases ???
I have a 2002 Fat Boy built to a big bore 95ci and I want to have the starter last longer.......it fires right up but it kiks back once and a while the engine has been camed also.
I was wondering about Compresion Releases and about the rite ones are they in the heads? or in the valve covers?
Where is a good place for me to start?
I was wondering about Compresion Releases and about the rite ones are they in the heads? or in the valve covers?
Where is a good place for me to start?
Last edited by Rockrspud; Apr 26, 2010 at 02:02 AM.
Road Warrior
Joined: Jun 2007
Posts: 1,788
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From: Here
I'd recommend a set of manual releases. They always work and they are easy to replace/clean if you need to (although I don't recall hearing any stories on here about the automatic ones failing). They are typically mounted in each head right next to the spark plug hole.
I'm not totally sure about this, but it seems like the automatic ones fit down through the rocker box under the tank.
I'm not totally sure about this, but it seems like the automatic ones fit down through the rocker box under the tank.
Banned
Joined: Sep 2009
Posts: 3,569
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From: deland,florida
we use goodson manual releases,make sure you use good,USA made releases.also when machining the heads,only go into the head with a .187 hole in case there is a failure,the pieces wont fall into combustion chamber,we machine thread length of open release + .050,then just a .187 hole into chamber.
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Grand HDF Member
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From: Newcastle, Ca.
Found this. Search for more info...
"Another benefit of limiting tappet plunger movement is easier starting. When an engine is not running, the hydraulic tappets tend to bleed down. The effect of this is higher cranking compression when restarting the engine. Some high-compression, large-displacement engines may become very difficult, if not impossible, to start. With the HL2T spacer installed, the collapsing effect is minimized and both high-rpm performance and starting are improved. Under typical driving conditions, normal hydraulic function and the benefits of a hydraulic tappet (minimal noise and maintenance) are retained. I still am a big fan of limiter kits when using Andrews, Crane, or S&S cams, to name a few. However, they are all long duration cams relative to their lifts."
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Club Member
Joined: Jun 2007
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From: Bedford UK
I'd recommend a set of manual releases. They always work and they are easy to replace/clean if you need to (although I don't recall hearing any stories on here about the automatic ones failing). They are typically mounted in each head right next to the spark plug hole.
I'm not totally sure about this, but it seems like the automatic ones fit down through the rocker box under the tank.
I'm not totally sure about this, but it seems like the automatic ones fit down through the rocker box under the tank.
Last edited by grbrown; Feb 18, 2010 at 09:52 AM.
Road Warrior
Joined: Jun 2007
Posts: 1,788
Likes: 4
From: Here
Not a mechanic - have read about people using them them and know a guy that used them in his build. They basically limit the lifter travel, which helps when they bleed down when the motors hot and you try to start it and get a kick back. Some say to try adjusting the pr's more. But, this does not have the same effect as travel limiters.
Found this. Search for more info...
"Another benefit of limiting tappet plunger movement is easier starting. When an engine is not running, the hydraulic tappets tend to bleed down. The effect of this is higher cranking compression when restarting the engine. Some high-compression, large-displacement engines may become very difficult, if not impossible, to start. With the HL2T spacer installed, the collapsing effect is minimized and both high-rpm performance and starting are improved. Under typical driving conditions, normal hydraulic function and the benefits of a hydraulic tappet (minimal noise and maintenance) are retained. I still am a big fan of limiter kits when using Andrews, Crane, or S&S cams, to name a few. However, they are all long duration cams relative to their lifts."
Found this. Search for more info...
"Another benefit of limiting tappet plunger movement is easier starting. When an engine is not running, the hydraulic tappets tend to bleed down. The effect of this is higher cranking compression when restarting the engine. Some high-compression, large-displacement engines may become very difficult, if not impossible, to start. With the HL2T spacer installed, the collapsing effect is minimized and both high-rpm performance and starting are improved. Under typical driving conditions, normal hydraulic function and the benefits of a hydraulic tappet (minimal noise and maintenance) are retained. I still am a big fan of limiter kits when using Andrews, Crane, or S&S cams, to name a few. However, they are all long duration cams relative to their lifts."
