[ace.cafe]

Very interested to hear all about the outcome!

[Gremlinsteve]

865cc on a stock tune runs but will have a major flat spot in the graph

I expect that to be cleaned up now and the future pulls will only increase the rwhp

[Blazes Boylan]

Plus 12 rwhp and zero tuning performed yet

The stock bike is about, what, 42 rwhp?  So that would put you at 54 before the tune.

[Gremlinsteve]

Yep

[Gremlinsteve]

I’m really hoping to reach 60 after the tune. Just don’t know if that will happen

[Blazes Boylan]

60hp seems completely realistic for all the work you’ve done.  Next winter I’m looking to install the S&S camshaft and high compression pistons, hopefully a much simpler process.  Naturally I’ll add a PowerTronic or Power Commander.  I’d definitely pay $350 for a dyno-tune.

[ace.cafe]

The flow should be enough with your head work for more power.

IMO, the S&S cam is a bit too advanced, and there is a little bit of room to retard it 3 degrees for a 110°ATDC intake lobe center. I don't know the cam fixing sysytem, but if it uses the common Woodruff Key, you could get an offset Woodruff Key for the amount you need to retard.

That should shift the torque peak up to a slightly higher rpm, which might give it the hp bump you seek.

I know some people say that 4-valve can run shorter durations because of valve area, but I looked at those S&S cam specs which I presume are @.050" lift, and I find them to be closing too early for higher rpm power, with the flow that you measured on your ports.

Not a lot of room to shift that cam, but there is a little bit of room to go to 110 on the intake.

If you don't reach your power goal, you might try it.

[Jako]

Guy on 'RE 650 owners  Australia ' facebook page   claimed    93 hp  at the wheel. 865cc custom cam ( not S&S)  larger throttle bodies,  extensive head work,  custom headers . 6 hrs dyno time. Tuned by the guys who recently set the speed record at lake Gairdner salt flats.

[Haggisman2]

60hp for all that work!

[Blazes Boylan]

If Gremlinsteve wants higher numbers he could always use a different dyno.  Maybe you folks in the Southern Hemisphere get better performance because everything is upside down.

[ace.cafe]

The flow should be enough with your head work for more power.

IMO, the S&S cam is a bit too advanced, and there is a little bit of room to retard it 3 degrees for a 110°ATDC intake lobe center. I don't know the cam fixing sysytem, but if it uses the common Woodruff Key, you could get an offset Woodruff Key for the amount you need to retard.

That should shift the torque peak up to a slightly higher rpm, which might give it the hp bump you seek.

I know some people say that 4-valve can run shorter durations because of valve area, but I looked at those S&S cam specs which I presume are @.050" lift, and I find them to be closing too early for higher rpm power, with the flow that you measured on your ports.

Not a lot of room to shift that cam, but there is a little bit of room to go to 110 on the intake.

If you don't reach your power goal, you might try it.

So, I read just now that the S&S cam has adjustability.. That should make retarding easy. Maybe even try 5 or 6 degrees retard, if you seem to be getting results with the 3.

It will cost a little bit of low rpm power, but not much. Retarding the cam always gives more high rpm power with minimal reduction of some lower rpm power.

[Gremlinsteve]

I agree
It is in pretty much straight up right now
I’ll adjust it if needed

[Gremlinsteve]

Over 60 rwhp now with more to go

[zimmemr]

Over 60 rwhp now with more to go

Nice job, you should be proud of yourself. That'd make for a pretty competitive entry level dirt track motor, one that'd certainly be capable of winning  at the pro-am level.

[ace.cafe]

Over 60 rwhp now with more to go

Looking good!