I have a 2014 FLHTK with the HO 103 engine.
I have a couple questions.

1.) What cam does the HO 103 come with from the factory?
2.) What is the compression ratio for the HO 103?
3.) Are there any issues changing heads/cylinders on this motor due to the cooling system?

Thanks for your responses?

Jim

 

1)Cam is very similar to the SE255; see the attachment for the differences.
2)10:1
3)Heads, yes; cylinders, no.

 

Thanks djl.

So, does this limit my head options as far as what I am able to do? I mean, am I relegated to only being able to perform head work on the existing heads for better performance?

If so, this sorta sucks.

Jim

 

You haven't poste in a while; good to see you back on the forum.

Yup, unless you want to ditch the whole Twin Cooled system of fans, radiators, etc. The HO103 heads are machined for the water circulation around the exhaust port so any non Twin Cooled heads would not be compatible. The HO103 heads can be ported but I don't know what the limitations are, if any. Check with Scott/Hillside and/or Kirby/VeeTwin; they will know much more about what can be done with those heads than I know.

 

Just a bit of clarification - no issues with heads either pn 16500208 CNC ported heads.

BTW I also have a 2014 Limited and I ordered the PRO STAGE V 92500037 but I swapped the air cooled CNC ported heads pn 16500013A with the CNC ported water cooled heads pn 16500208

 

I understand that the OP to be asking a broader question regarding options for replacing or modifying the water cooled heads. While he can have his heads ported, his options for replacing them are limited to water cooled heads like the set you sited in your above post.

 

You correct there are fewer options available for 2014 and up water cooled heads. The only options I found was to port the existing heads or simply replace them with new CNC ported heads.

 

Thanks to you both. djl, yes its been awhile. Just haven't had the time I used to spend reading the forum. As you can see, I haven't even updated by signature picture. It still show the 2009 SG. I traded it for the 2014 Ultra Limited late last year. So I have some decisions to make on what I'm going to do with the new motor. I may only install a bolt-in cam. Or, I may do more. I don't know yet. So, if I left the compression alone, what do you recommend for a cam that moves the torque band up a little higher in the RPM range? I've read that the SE-204 would be a good choice. Do you have other recommendations I should consider. I can feel the motor just doesn't have the power I'd like and am used to above 4,000 RPM. When I get on it, I want to feel it.

Thanks,
Jim

 

Disclaimer first. As you may remember, both my bikes are "old"; 2002 FLHT all bore 107" (124TQ/110HP) and 2005 FSXTD 95" (104TQ/94HP) and I haven't worked on any Rushmore motors. However, I do go to a local dyno day, once a month at Lozano Brothers shop and watch the various iterations of Stage kits and other builds do a couple of pulls to see what the motor are doing. Mike Lozano is my go to guy for head and machine work.

I know you already know this but without some basic head work, the motor will not reach its full potential, so let's set that aside for the purposes of this discussion. As previously noted, you always have the option of installing the SE CNC ported heads ($999.99) which limit max valve lift to .585". The MoCo used to offer a porting service for those heads for $699.99; not sure if that service is still offered; down time may also be an issue.

IIRC, the '14 HO103 runs a 50mm TB and the static CR is about 10:1 and the new HO103 cams. See the below attachment for the difference in profile between the 2013 and 2014 cams. As you can see, it is a short duration EPA cam and has to go. The later intake manifolds are more restrictive than the '08-'10 and while I am not sure that the early manifolds will retro fit, you can always send the manifold to Dan Vance or, I think, HPI for modification/port matching which will help deliver horsepower.

Personally, I like the SE204 cams but if you do that route, I would suggest installing a set of 1.7 ratio rockers to increase lift. The SE204 would maintain your current corrected CR and CCP which shouldn't take too much away from the bottom end but make a measureable difference in mid and upper range. When I ran the 204s in my 95" motor with BigBoyz "street" ported heads, the motor pulled to 6000.

A lot of guys are running the Andrews 57 with good results; same profile as the 37 but with more lift. I have seen some decent results with the S&S 570 as well. A lot of the Stage IV guys unhappy with the SE259 have replaced it with the S&S 585.

As you know, you need to pay the "Harley tax" and open up the air filter and exhaust. V&H Power Duals, Fullsax X-Pipe with a set of high flow mufflers seems to be the fix there.

Of course, a good tuner/tune is the key. So you will need TTS Mastertune or DJ Power Vision tuner and a good tune.That's about all I have to offer on the subject. Keep me posted on what you do and the results.

Check the link; photos of a 103"-107" wet head conversion.
http://harleytechtalk.org/htt/index....c,67599.0.html

 

As always, excellent information that I can use catching up on what I've missed out on the past year. So, I didn't detail what I've already done to the bike. My bad!! I went with a Stage II air filter system and a D&D Fat Cat 2 into 1 exhaust along with the Power Vision Auto Pro Tune. I just installed it in the last few weeks. I like your idea of the SE204s with the 1:7 ratio rockers. That would be a very economical HP/TQ increase. I can see how I like the performance of that mod and then determine if I want to go more in the way of TB or headwork. Really appreciate the advice. I'll keep you posted as I move forward.

Jim