Compression release question
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Tourer
Joined: Jul 2016
Posts: 353
Likes: 38
From: Ohio
Compression release question
Having compression release ports put in my 09 96 cylinder heads. I would really like to put the ACR type that the newer 103's use. Is that an option on a 96 head or is the placement in the combustion chamber a problem or performance limitation. I know the 103 has a slight slot milled into the combustion chamber to position the solenoid in the middle of the head. Thanks in advance for any info... Mike
Road Warrior
Joined: Nov 2007
Posts: 1,800
Likes: 307
From: Houston, Texas
I don't know all the details but my indy machined my heads and put the ACR's on my 08 when he upgraded it to a 103. There was an additional wiring harness he had to get as well as going into the ECM to turn them on.
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Tourer
Joined: Jul 2016
Posts: 353
Likes: 38
From: Ohio
Lot of guys put the manual ones on that you have to reach down and push the button in. If I can I'd like to just put the electric solenoids on. You can just wire into the starter solenoid circuit I would think instead of programming the ECM. I have a DynoJet PowerVision tuner so that may be an option to do within that. I just wasn't sure if the 96 head combustion chamber shape is the same a the 103 and you could put the release valves inboard of the head instead of out by the spark plug.
Seasoned HDF Member
Joined: Jan 2011
Posts: 157,462
Likes: 57,017
From: Michigan 15 Minutes East Of Hell
Wire them through the "Start" switch"
Road Master
Joined: May 2012
Posts: 773
Likes: 124
From: Between purgatory and retirement
Hardest thing about it was finding a dealer with the tool (Screamin Eagle Automatic Compression
Release Tool, part # 94648-08) that would do it (and I trusted.)
Wired it up with the Harley harness ( 70623-06 or 70623-08, depending on application.)
Had the dealer freshen up the heads while they were at it, about $500 total, I did the removal and install of the the heads.
The PV can turn on the ACRs.
Other options; manual releases (cheaper) or Easy Start cams.
.
Release Tool, part # 94648-08) that would do it (and I trusted.)
Wired it up with the Harley harness ( 70623-06 or 70623-08, depending on application.)
Had the dealer freshen up the heads while they were at it, about $500 total, I did the removal and install of the the heads.
The PV can turn on the ACRs.
Other options; manual releases (cheaper) or Easy Start cams.
.
Ultimate HDF Member
Joined: Jun 2009
Posts: 6,899
Likes: 3,412
From: OH
I just got some 103 take offs and the harness for my 107 build. The harness was like $60 bucks or so. Your heads can be machined if the shop has the jig for it. Not all do when I was asking around. The jig is like $900 so I was told and not a lot of people ask for it. They use the manuals and there were only a few years where they were able to be added.
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Road Captain
Joined: Jul 2012
Posts: 506
Likes: 7
From: Charlotte, NC
I had auto ACR's put on my 107 big bore with stock 96 heads. Need a wire harness installed to start switch and they work great. Easy starts.
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Road Warrior
Joined: Jun 2008
Posts: 1,437
Likes: 80
From: currently an Okie
Try these guys
www.danvanceracing.com
If I were going to send heads out to get ACR's, I would have them ported at the same time.
It's $250 for these guys to drill ACR's and $400 for a street port. They may have 103 ported heads ready that they would swap out so you wouldn't have to wait too long on them.
If I were going to send heads out to get ACR's, I would have them ported at the same time.
It's $250 for these guys to drill ACR's and $400 for a street port. They may have 103 ported heads ready that they would swap out so you wouldn't have to wait too long on them.
Last edited by rkoivisto; Jan 12, 2017 at 06:46 PM.
