new 103
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Road Master
Joined: Nov 2007
Posts: 1,181
Likes: 7
From: tomball tx
new 103
I have read a few articles about the "High Output" 103 in the new 2016 softalls. I have a 2014 FatBoy with a 103. What, if any, are the differences between the 2? I have V & H 3" slipons on my bike along with a Fuelpak 3. Just curious to know the differences.
Also thinking of installing 255 cams in my bike. From what I see and hear though is that the FP3 will be of no use on this. I need to get a different tuner. Ideas and suggestions welcome...thanks!
Also thinking of installing 255 cams in my bike. From what I see and hear though is that the FP3 will be of no use on this. I need to get a different tuner. Ideas and suggestions welcome...thanks!
Road Captain
Joined: Dec 2013
Posts: 631
Likes: 26
From: Rome (Italy)
As far as I noticed studying micro fiches the differences are basically the new 50mm throttle body (previous was 46mm) and cams. HO sounds impressive as a term itself but the real output difference between a 103" and 103" HO seems to be within the range of a couple of hp and lb/ft...
Probably after a Stage I upgrade this gap would be a little bit higher since we all know these engines are "choked" from the factory setup to comply EPA requirements and a 50mm throttle body itself could benefit a 103" engine something more than the declared factory data.
Regarding cams swap, I'd suggest to go with SE-204 rather than SE-255.
204 cams have peak HP at around 5800 rpms while 255 at 5300, plenty of TQ in low-middle range exactly where you need. Moreover 255 cams are known to run the engine hotter than 204. With a good dyno on a Stage II with 204 cams you can easily pass 90hp. Just my .02
Probably after a Stage I upgrade this gap would be a little bit higher since we all know these engines are "choked" from the factory setup to comply EPA requirements and a 50mm throttle body itself could benefit a 103" engine something more than the declared factory data.
Regarding cams swap, I'd suggest to go with SE-204 rather than SE-255.
204 cams have peak HP at around 5800 rpms while 255 at 5300, plenty of TQ in low-middle range exactly where you need. Moreover 255 cams are known to run the engine hotter than 204. With a good dyno on a Stage II with 204 cams you can easily pass 90hp. Just my .02
Club Member
Joined: Aug 2008
Posts: 22,840
Likes: 17,865
From: Lafayette, Louisiana
Last night I checked HD's website and compared a 2015 Heritage to 2016 Heritage.
It was 2.2 foot pounds of torque more on the 2016.
That is not a typo. Two point two foot pounds of torque more.
HO doesn't stand for high output. It must stand for Hype Output!
Look at some of the Andrews cams. There is a wide selection with varying characteristics.
It was 2.2 foot pounds of torque more on the 2016.
That is not a typo. Two point two foot pounds of torque more.
HO doesn't stand for high output. It must stand for Hype Output!
Look at some of the Andrews cams. There is a wide selection with varying characteristics.
Club Member
Joined: May 2007
Posts: 145,895
Likes: 821
From: 40 miles Northeast of Indy..
As far as I noticed studying micro fiches the differences are basically the new 50mm throttle body (previous was 46mm) and cams. HO sounds impressive as a term itself but the real output difference between a 103" and 103" HO seems to be within the range of a couple of hp and lb/ft...
Probably after a Stage I upgrade this gap would be a little bit higher since we all know these engines are "choked" from the factory setup to comply EPA requirements and a 50mm throttle body itself could benefit a 103" engine something more than the declared factory data.
Regarding cams swap, I'd suggest to go with SE-204 rather than SE-255.
204 cams have peak HP at around 5800 rpms while 255 at 5300, plenty of TQ in low-middle range exactly where you need. Moreover 255 cams are known to run the engine hotter than 204. With a good dyno on a Stage II with 204 cams you can easily pass 90hp. Just my .02
Probably after a Stage I upgrade this gap would be a little bit higher since we all know these engines are "choked" from the factory setup to comply EPA requirements and a 50mm throttle body itself could benefit a 103" engine something more than the declared factory data.
Regarding cams swap, I'd suggest to go with SE-204 rather than SE-255.
204 cams have peak HP at around 5800 rpms while 255 at 5300, plenty of TQ in low-middle range exactly where you need. Moreover 255 cams are known to run the engine hotter than 204. With a good dyno on a Stage II with 204 cams you can easily pass 90hp. Just my .02
Don't believe everything your read in here....!!!!
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Extreme HDF Member
Joined: Dec 2007
Posts: 13,402
Likes: 941
From: Illinois
The HO103 as some have posted have a larger TB and a stock AC that flows better than the previous version.
The third difference is the cams. They are close to the 255's except they don't have overlap. Just a little less height in the lobs.
A stock 103 bike like a 13 Road King going against a stock HO103 14 Road King will watch the 14 pull away from them with authority.
More fuel and air in is more power.
My new Heritage just got the 1K service done. Given that it is lighter than the touring bikes with the HO103 it should really perform. I will soon find out.
The third difference is the cams. They are close to the 255's except they don't have overlap. Just a little less height in the lobs.
A stock 103 bike like a 13 Road King going against a stock HO103 14 Road King will watch the 14 pull away from them with authority.
More fuel and air in is more power.
My new Heritage just got the 1K service done. Given that it is lighter than the touring bikes with the HO103 it should really perform. I will soon find out.
Last edited by lh4x4; Oct 12, 2015 at 11:57 PM.
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Club Member
Joined: Aug 2008
Posts: 22,840
Likes: 17,865
From: Lafayette, Louisiana
Originally Posted by lh4x4
A stock 103 bike like a 13 Road King going against a stock HO103 14 Road King will watch the 14 pull away from them with authority.
Interestingly enough the Road King has 104.7 pound feet of torque.
New Heritage is 97.4 pound feet
Previous model year Heritage is 95.2 pound feet
Last edited by Prot; Oct 13, 2015 at 12:08 AM.
Road Captain
Joined: Dec 2013
Posts: 631
Likes: 26
From: Rome (Italy)
Oct 1949, whats wrong with what I wrote?
Differences between 103" and 103"HO engines, as also stated by other members are correct in terms of parts (cams and throttle body) and performance (about a couple of hp and lb/ft torque).
If he wishes to stay with SE cams focused on low end torque, isn't true 204 could be better than 255 unless you have a heavy bike? So, what's wrong?
At least I tried to give some objective data and info from my own (limited)experience.
Don't be sibylline...
If I'm wrong somewhere just correct me so at least I may be able to learn something...
Differences between 103" and 103"HO engines, as also stated by other members are correct in terms of parts (cams and throttle body) and performance (about a couple of hp and lb/ft torque).
If he wishes to stay with SE cams focused on low end torque, isn't true 204 could be better than 255 unless you have a heavy bike? So, what's wrong?
At least I tried to give some objective data and info from my own (limited)experience.
Don't be sibylline...
If I'm wrong somewhere just correct me so at least I may be able to learn something...
Last edited by Nostradamus74; Oct 13, 2015 at 03:09 AM.