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I am planning on installing a SE 103 kit [ 29903-07 ] and would like to install auto compression releases [28861-07a] while I have the heads off. Based on my research so far it looks like these install in the center of the head instead of next to the spark plug.
Has anyone have any experience with these? How are these wired? I think they are wired to the ECM and require programing but I think they could be tied into the starter solanoid circuit?
Any infomation will be appreciated. This is a 2007 ulta, stock except for SE 255 cams. I plan on using stock heads and head gaskets. I know I could get more power by reworking the heads and raising the CR but I am doing this for the fun of the project rather than getting more power. I may not need compression releases on this build, but they do take a load off the starter. If I put in manuel releases I would probably not use them.
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IF you DONT need them then DONT install them... Just another possible point of failure IMHO
But yes, they do wire into the ecm via a seperate wire harness and need to be turned on in the programing. They require a jig from harley to have them drilled in the head.
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2009 107" Vivid Black Ultra Classic, Chromed Comfort with a kick!
2003 Bourget Fat Daddy 117" N20 - Tire Smoker
I just went through this same dilemma HERE. May I suggest you use manual releases? Reason being, if the ACR's fail, your back into your head to replace, in which the ACR's are prone to failure. If a manual CR fails, take it out and replace. Easy peasy.
It is definitely good of you to do the CR's, because some are reporting "hot starts" with a 103/255 build, and hindsight is 20/20. I know I'd be replacing a starter in no time if I had not put CR's in my build. This thing is STOUT on starting and kick back would destroy the gear in no time without CR's.
Lastly, PLEASE reconsider using a stock harley head gasket since you are going to have the heads off anyways. The '07's are known to have the pistons 0.009" down in the hole, so if you use the stock 0.053" head gasket you are more than likely going to have to retard the timing so much to prevent detonation it will kill the goal of going big bore. Measure the deck height(it only takes 5 minutes) and set it with the proper Cometic gasket and you'll be golden.
NONE of these suggestions would inconvenience you or your builder. Simple "mods" to optimize your build.
__________________ 2007 UltraClassic\103"BB\.030 Cometic Head Gasket\SE 255's Doherty PowerPACC w/vents\Supertrapp SE's\SERT\Bagger Brace M1 15W-50 incrank\Redline MTL in Primary\Redline Shockproof in Tranny My other toy!
I have the ACRs with my 103" SE 255. They are turned on with the SERT or SEST or TTS Mastertune. You will need the expensive HD jig to drill the heads, or take the heads to a dealer that has the correct jig.
I had hard starting issues until I installed the ACRs. While trouble shooting the starting issues, the dealer replaced my starter, compensator, and clutch under warranty. I paid the difference and got the high torque starter and SE compensator. It is truly like a different bike now. The SE compensator made a huge difference in starting and riding.
I just went through this same dilemma HERE. May I suggest you use manual releases? Reason being, if the ACR's fail, your back into your head to replace, in which the ACR's are prone to failure. If a manual CR fails, take it out and replace........
I've been told that the later ACRs have been trouble free, unlike the earlier ones.
I've been told that the later ACRs have been trouble free, unlike the earlier ones.
Could very well be true. Sure makes it nice just hitting the starter versus touching those hot little flames sticking out of the heads.
To the OP, eitherway, put the CR's(whichever you choose) in the heads. You won't be sorry if you do.
__________________ 2007 UltraClassic\103"BB\.030 Cometic Head Gasket\SE 255's Doherty PowerPACC w/vents\Supertrapp SE's\SERT\Bagger Brace M1 15W-50 incrank\Redline MTL in Primary\Redline Shockproof in Tranny My other toy!
Last edited by UltraKla$$ic; 10-14-2009 at 11:36 AM.
If you are going to do this also go with the SE compensator. It will help in the long run.
I am considering this just to get rid of the starter clunk. I have all winter to get this done. I am only in the plannig stage, I do have the SE 103 kit, and am making a list of what else to do.
I had the SE 103" Stage 4 Pro Race Kit installed last winter with the electronic compression releases installed, they are nice, turn on the ignition, they open and when the bike fires they close.....simple....I have over 7500 trouble free miles on these, plus I did NOT install a new starter, still using the 2007 stock starter. Of course the heads that came with the kit had the holes drilled in them already. My advice go with them. John
auto compression releases
