So I am curious and have not seen specific information as to what exactly makes this 103 build a "High output" motor. What is it? Bigger cams? compression ratio? Better HP and TQ specs from the factory?

 

I read somewhere that the compression ratio is 10.2:1.
Don't know what the stock hp/tq is but I will find out in a few weeks when I have mine dyno tuned.

 

Higher compression and different cams.

 

Any idea what the comparison is from stock? Are they SE cams?

 

Compression is listed by model on Harley's website. "S/E" doesn't really mean anything as it's just a marketing term. The cams are similar to the 255s, but pull much better at higher RPMs than any 255 I've ever ridden.

 

only on the HO 103 twin cooled. The air cooled 103 HO is like 9.5 or something around there.

 

Bad *** and IMO, the best Harley motor ever from the factory.

 

Not much difference in compression, air cooled 9.7 and wethead 10.0 basically the cams and some head work make it an HO.

 

Thanks everyone. I am more familiar with the Andrews cams for comparison, which is why I asked about the HD cam versions.

 

Moco literature states 50% increase from new air cleaner design and 50% from cam change.

intake with 30% more airflow and cams with a little more duration and lift .211" vs .198" than 13 and earlier cams, similar to a SE-255 but 4 deg later and much less lift .255"