Just wondering with MODS how much horsepower guys are getting from there 103 engines in the new Harleys? What would the possible MAX be?

 

Short Answer. No more then 110 then after that you need to start looking at doing something with the bottom end to handle the power.

 

110 HP aint bad! LOL.. Probably could make it sound like it has 300 hp tho!!!

 

No replacement for displacement...speed costs money, how fast do you want to go?

 

It all depends on what mods you do? You could get pretty frickin extreme with these motors.. probably would get more than a thousand miles before you'd need a rebuild though.

 

How much you wanna spend? I know a certain normally aspirated 103 in the area making 140hp+ (yes dynoed).
Money no object, you could make 103" make 500+hp. Of course it would be running nitro and need rebuilding every 1/4 mi and it really wouldn't be a Harley any more and...

 

How much are you willing to spend? When you cross the 110-115HP range, you're going to have to do the bottom end. That's a lot more money.

My 103 has 10.5 to 1 pistons, Wood TW-6 cams, Screaming Eagle heads, Master Tune TTS, and dyno'ed at just over 100HP/105Q. Could I get more HP out of it? Sure. Do I personally need more HP on this bike? No.

It is a very dependable/comfortable every day driver, and will rapidly transport you into the triple digit range of your speedo. This is on an 800+lb Street Glide.

 

Well i think im just curious on how much HP these engines can achieve since there 103 ci.. i just figured you would be able to get respectable #s out of it! Im looking to turn my Fatboy lo into sort of a Muscle bike! Ill be honest when i was buying a bike last year it was a toss up between a Night rod and the Fatboy LO.. Well the lo one because the Night rod was a 2011 and was not comfortable at all! I heard they totally changed the 2012 Night rod and they are comfy.. So instead of trading in My new Fatboy Lo for a Night rod i figured i would juice up The Lo to get some more HP.. I also want to MOD its Style to look the part. Id like to do a wicked exhaust, Fat rear tire 250mm,and black out the bike more! I want it to be one Bad a$$ Fatboy Lo!!!!

 

If you want big HP gains, go w/ some sort of blower. The bottom end worries are exaggerated IMO. The few bottom end failures there are, are not frequently catastrophic events. You'll hear a lot of noise and then need to tear into it. I'm thinking of doing a ProCharger on an other wise stock 110'. Should yield in the 130-140 HP range. I'll run it till something busts, (which could be a very long time or not at all) then get in there and put in a welded crank when the time comes. (and a few other things). But unless I'm building a motor from the bottom end up, I wouldn't split the cases till I was forced too.

 

How much did that cost?