Originally Posted by FXSTD.AU

I've got a 2007 Deuce (SERT, SE AC, V&H BR dyno-tuned) that isn't quite keeping up with friends of mine who have recently traded up to 2008 SE Springers. I've resisted considering any engine mods so far as i want to retain reliability, but thats about to change. I don't want to consider a 110" kit (too expensive) and my dealer suggested an increase to 103".

I've spent most of today reading posts on 103-107 builds and i've probably got as many questions as i started with, although i hope those questions are a little smarter. I know i can't achieve the HP or TQ of a 110 upgrade, but done right i should be able to get very close for considerably less money. I'd like to aim for the neighbourhood about 90HP and 100TQ. I do a lot of my riding around town (up to 3500-4000rpm) and want to feel the power down low, but also want reasonable overtaking power around 3500-4500rpm on the highway, though I rarely push it past 4000rpm.

Would something like an Andrews 54H work well, or would the 26H suit better? What about the Wood 6-6 or 7H? What else should i consider? Would i also need to upgrade the throttle body or other ignition components?

I've figured out i'd need to port and polish the cylinder heads, and it seems worthwhile to be safe and have a manual compression release installed (especially if the compresison ratio increases from stock).

Is there much difference (in terms of extra parts and labor) in building a 103" as compared to a 107"?

(I'm resisting changing over the V&H BR at this time, though a 2-1 pipe might be a future option).

Originally Posted by FXSTD.AU

UPDATE.

After all this discussion, my local stealer had a winter deal on for a 103" upgrade. Bored cylinders, new pistons, retained cylinder heads but added compression releases, new throttle body (52 or 54mm, can't remember exactly) and the SE 211 cam. Not what i started out looking at but as part of the deal it was about $1,000 cheaper than it would have been to with individual pieces. I added a Supertrapp SuperMeg 2-1 at the same time to replace the Vance & Hines Big Radius 2-2 i had been running.

I've just got to back from being dyno tuned and have 97 HP and 110 TQ up from 72 HP & 83 TQ. A little disappointed i couldn't get it to 100HP but it's such an improvement on the previous performance i'm not going to obsess about 3 horses since i opted not to do any head work. I'm loving the power staight off the line now and it keeps pulling up to and past 90mph.

Thanks to everyone who chimed in. Thought you might like to know how the story ends.

Originally Posted by FXSTD.AU

UPDATE.

After all this discussion, my local stealer had a winter deal on for a 103" upgrade. Bored cylinders, new pistons, retained cylinder heads but added compression releases, new throttle body (52 or 54mm, can't remember exactly) and the SE 211 cam. Not what i started out looking at but as part of the deal it was about $1,000 cheaper than it would have been to with individual pieces. I added a Supertrapp SuperMeg 2-1 at the same time to replace the Vance & Hines Big Radius 2-2 i had been running.

I've just got to back from being dyno tuned and have 97 HP and 110 TQ up from 72 HP & 83 TQ. A little disappointed i couldn't get it to 100HP but it's such an improvement on the previous performance i'm not going to obsess about 3 horses since i opted not to do any head work. I'm loving the power staight off the line now and it keeps pulling up to and past 90mph.

Thanks to everyone who chimed in. Thought you might like to know how the story ends.

Originally Posted by Hillsidecyclecom

Fuel Moto(site sponsor) just tuned a 107"/Wood 555 cams/our Stage II(1.900" valve)heads, OE t/body, Rhinehart duals that showed 109 hp, 127 ft/lbs, SAE.
www.joescyclerepair.com also tuned fellow forum member OdiusBarbarian(?) 107", our Stage IV Head (2.00" intake), Wood 555, OE t/body modified to 1.700" port diameter, Bub Lakester 2/1 pipe that also cranked the big torque number at 128, but brought the hp up to 116, SAE.
The 107" engine set up correctly will show great power, and hats off to the tuners across the country, that are able to show the worth of those.
Scott