Build concerns
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Road Warrior
Joined: Sep 2008
Posts: 1,318
Likes: 54
From: Texas Panhandle
Build concerns
My wife has an '07 Street Bob that I am looking to take to 103". It's a 96" with Big Boyz street port and SE 211 cams and D&D Fatcat. Thats right. Sluggish low end with decent mid power. I picked up some parts cheap that another guy collected for a planned build, but lost his job and needed rent money. Here's what I have:
New Harley 103" cylinders
New SE forged 10.5:1 pistons
SE 259E cams (bought from forum member)
New Black Ops lifters
New S&S 585 valve springs
TTS Mastertune
Gasket set with Cometic MLS .030 head gaskets and a set of MLS .036 head gaskets
Here's my concern... Is the combo going to work? My alt. is around 3600' here in Texas.
Thanks in advance, guys!
New Harley 103" cylinders
New SE forged 10.5:1 pistons
SE 259E cams (bought from forum member)
New Black Ops lifters
New S&S 585 valve springs
TTS Mastertune
Gasket set with Cometic MLS .030 head gaskets and a set of MLS .036 head gaskets
Here's my concern... Is the combo going to work? My alt. is around 3600' here in Texas.
Thanks in advance, guys!
Last edited by Not E'nuff Harley; Oct 19, 2016 at 09:51 PM.
Banned
Joined: Sep 2009
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From: deland,florida
I agree,you`ll want every bit of the 10.5-1 to work with the 259E cams &we set them from 10.6-1 to 10.8-1),also check the flow of the heads,you`ll want them flowing in the 260+ @ 28" area (im sure their no where close now)
Thread Starter
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Road Warrior
Joined: Sep 2008
Posts: 1,318
Likes: 54
From: Texas Panhandle
The bike came to us in it's current configuration, so I only know what the previous owner shared about the heads. He said they were ported by Big Boyz, and that was it. Had to replace head gaskets a couple of years ago because the rear was leaking, so I do know it has stock valves in them, but no idea what the chamber volumes are. He said it was their basic port job, and that was it. I do know the dome volume on the SE forged 103" piston is 6.5 cc's..
Harley used to include these cams with their stage III kit and it shipped with these same pistons, but they don't tend to design the best kits, imo opinion. I have read that stock chamber volume tends to be between 85 and 87cc's(in most cases) and assuming volume of 86cc, I think ccr is likely to be high for a street motor. But I am by no means an expert. Thanks for your responses, guys. I appreciate it.
Harley used to include these cams with their stage III kit and it shipped with these same pistons, but they don't tend to design the best kits, imo opinion. I have read that stock chamber volume tends to be between 85 and 87cc's(in most cases) and assuming volume of 86cc, I think ccr is likely to be high for a street motor. But I am by no means an expert. Thanks for your responses, guys. I appreciate it.
Last edited by Not E'nuff Harley; Oct 20, 2016 at 06:53 AM.
HDF Community Team
Joined: Jun 2006
Posts: 12,774
Likes: 2,606
From: san antonio
Bean retains OEM valves and springs for his typical street port, so no mystery there. What you may not know is whether or not the heads were decked, so it would be worthwhile to have the chambers measured while you have the heads off as well as have the flow tested. I talked to Bean way back in '06 and quizzed him on flow data for his heads and his response was that he does not flow every set but does measure flow randomly and that his street ported heads flow "about the same as a set of the early SE Performance heads" which I doubt is in the 260-280 cfm range that Kirby makes reference to.
I would likely bore the 96" cylinders to fit the new pistons to insure a good fit. At least have the 103" cylinder bores checked in torque plates to verify that the bore is true and that piston fitment is within specs. I would also check deck height, it wouldn't cost much to set to 0.00"
If chambers are 85-86ccs and deck height (which we don't know) is an average of say .007" down in the hole, I am thinking you can run that setup with a .036" head gasket and static CR will be about 10.7 which is in the range Kirby makes reference to and CCP is manageable at about 180psi at 3600 feet. If you wanted to bring static down a bit, you can always shave a bit off the piston dome.
Looks like a doable combination to me and, with the TTS and a good tune to top it off, she should be a runner.
I would likely bore the 96" cylinders to fit the new pistons to insure a good fit. At least have the 103" cylinder bores checked in torque plates to verify that the bore is true and that piston fitment is within specs. I would also check deck height, it wouldn't cost much to set to 0.00"
If chambers are 85-86ccs and deck height (which we don't know) is an average of say .007" down in the hole, I am thinking you can run that setup with a .036" head gasket and static CR will be about 10.7 which is in the range Kirby makes reference to and CCP is manageable at about 180psi at 3600 feet. If you wanted to bring static down a bit, you can always shave a bit off the piston dome.
Looks like a doable combination to me and, with the TTS and a good tune to top it off, she should be a runner.
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Road Warrior
Joined: Sep 2008
Posts: 1,318
Likes: 54
From: Texas Panhandle
I appreciate your response. So I am worrying too much about corrected compression? I am thinking I may have a stock set of 96" heads worked fresh just for this build. If I can afford that... ;-)
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HDF Community Team
Joined: Jun 2006
Posts: 12,774
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From: san antonio
I would not throw out the BigBoyz heads; they are not that bad and may actually flow close enough to the low end of the range Kirby posted to work; just need clean up and new guide seals. However, if you are planning to start with an untouched set of heads for a full port job, you could sell the BB heads and recover some of the cost to port the 96" heads. Kirby's suggestion to have the BB heads flowed is a good one, not that expensive and you may be surprised. There are inexpensive kits available online to measure chamber volume; check them out and you can come up with your own DIY hardware for that purpose.
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Thread Starter
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Road Warrior
Joined: Sep 2008
Posts: 1,318
Likes: 54
From: Texas Panhandle
I'm pulling it apart this weekend. I'll check deck height and see what I have. Really leaning to fresh heads and selling these, or just saving them for the future. My money isn't really that tight, just have my oldest in collge and well, anyone with kids in collge knows what that means.
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Road Warrior
Joined: Sep 2008
Posts: 1,318
Likes: 54
From: Texas Panhandle
Thanks for the input and advice. I appreciate the time you guys take from your busy lives to help out a stranger. I'm sending a set of stock heads to Kirby for work. I have no doubt he can give me the help and direction I need to make this one run!
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