Screaming Eagle motor
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Road Master
Joined: Oct 2012
Posts: 777
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From: Beaumont, Ca
Screaming Eagle motor
My 2000 Springer has a newer 103 ci (or is it 105 ci?) Screaming Eagle motor with compression releases. Are all SE motors equipped with compression releases? Why would they not have an automatic compression release in such a modern motor? I am curious as to what makes this particular Screaming Eagle motor a high compression motor. Are they all like that?
Stellar HDF Member
Joined: Apr 2016
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From: Masshole
It's not the year of the motor that's key, it's the year of the bike and electronics. ACR's are electrically driven so you would need your computer to tell them when to open. ACR's are a normally closed type valve and need to be opened manually or electronically. How would you think your 2000 Springers computer system would open the ACR at the right time when it never had them?
Seasoned HDF Member
Joined: Dec 2009
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From: Doghouse... mostly
All factory engines 96" and up have ACR's. Most aftermarket builds will have ACR's or MCR's. And in the case of the ACR's, yes there has to be a computer on the bike to tell them what to do and when to do it!
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Road Master
Joined: Oct 2012
Posts: 777
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From: Beaumont, Ca
Harley-Davidson sells a wire harness to enable the compression release to work automatically. Since my bike is a 2000 and might lack the newer electronics/computer, would it not be a candidate for such an upgrade?
Manuals ones are less prone to failure and easy to change. I do not think it is worth the cost or time.
Regarding the modern motor thought - yours is 20 years old so you have to put it into perspective. 20 years ago, auto compression releases weren't a blip on HDs radar.
Seasoned HDF Member
Joined: Dec 2005
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From: poway
It's hard to tell which 103 more you have but I suspect that it's from a something like a 2005 to 2006 cvo motor. Not sure when exactly when as I knew a guy with a 04 se Deuce that was still 95 ci motor. Anyway the 2005/6 103 cvo did not have compression releases but had a late closing intake to bleed off compression. Also there were some 103 (03 to 06?) baggers that were low compression but they won't fit in a softail.
Anyway I suspect that in order to go to automatic you will need to change the heads to later model heads that have the location for the automatic ones or have your heads machined then build a circuit that triggers off the starter relay.
BTW the 07 to 10 96 CI did not have auto releases tho I suspect that the ECU could be programmed for some. Could be wrong about the dates.
Anyway I suspect that in order to go to automatic you will need to change the heads to later model heads that have the location for the automatic ones or have your heads machined then build a circuit that triggers off the starter relay.
BTW the 07 to 10 96 CI did not have auto releases tho I suspect that the ECU could be programmed for some. Could be wrong about the dates.
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Road Master
Joined: Oct 2012
Posts: 777
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From: Beaumont, Ca
I should have been more clear. The Screaming Eagle motor is not twenty years old. It wa put in sometime around 2018. I am just asking a lot of questions so I know better what makes my motor tick.
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Seasoned HDF Member
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From: Snow Hill, NC
My 07 flhtc with the 96” didn’t come with ACR’s, the dealer added 1 manual release on the front cylinder when I was having compensator issues which made the starter grind...it helped. When I put the 103ho oneness bike it had ACR’s and it makes starting the bike way better.
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Joined: Dec 2005
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From: poway
Well the technically you should be more clear as to which SE motor you installed. Got a part number? There is more than one. Now where's my crystal ball? It hasn't worked all that well since my son went bowling with it..
