I know I'ts a bit late but, as promised, here is the readout of the dyno run I had 2 weeks ago.

Sometimes It's interesting to see how the power is produced, not just the final figure.

Bike:

2004 XL1200R Roadster with approx 1100 miles.

Mods:

SE Air Cleaner (29042-04)
SE 2 Mufflers (80424-04)
SE Mikuni HSR42 Carb (27454-01)
SE Cam kit (25197-04)
SE Ignition Module (31785-04)

Also fitted with SE Syn-3 Synthetic oil.

Peak power was 80.5 bhp at 6600rpm
Peak torque was 73.9 ft at 4650rpm

Just to re-mention to anybody who is new to this subject:

1. I know Harley quote 71 bhp and 79 ft for the standard machine in their info. but that is at the crankshaft, not at the rear wheel.

2. The SE division quote (more realisically): 59 bhp and 68 ft for the standard machine at the rear wheel.

3. I know a pre 04/05 1200S with similar mods produces slightly more power/torque but this is because it has a higher compression ratio.

4. According to SE a bike with these mods should produce 79 bhp and 72 ft.

5. H-D (SE) use the same dynamometer as this (Dynojet), so the results should be similar.

6. With other makers exhausts / cams / ingintion etc it is possible to get higher than this figure (especially with a big-bore kit), but it is unlikely you are going to match a Buell XB12S (the exhaust is the main reason - fuel injection another).


I hope this is of interest.

Those are good numbers on your stock headed bike ...

Just as a comparison, I am going to dyno my Stage 1 bike next week prior to installing those SE cams. I will post those numbers and try to post the graph too if I can find a scanner somewhere.

I am going to leave the heads alone for awhile. I still don't know what to do with them. Anyway, I will re-dyno after the cam install and then we can compare these numbers. Of course, rwhp will vary slightly from one DynoJet to another (even if it really shouldn't since the numbers are all corrected to SAE standard conditions)

Thanks for posting the info ... :)

http://img.photobucket.com/albums/v248/Turbota/holeinthewall.jpg

I know Barry1967 has done a lot on this subject (about headwork I mean) and he has spoken to Andrews at length about flow rates. etc.

I don't think I will be doing any further mods to my engine, I just wanted to try a few SE bolt on/in items. I think you can possibly go too far chasing just a few more HP/Ft for big bucks and I have to draw the line myself financially (although I would love to try a big-bore kit!

The other thing that is highlighted when you start modifying the engine is the handling, or rather how it also needs to be uprated.

It is always interesting to see other peoples mods though!