Waste of money .....

[MonsterHPD]

Under 10% is good, so you are fine.

Thanks. I can sleep well tonight :-)

[koko64]

I think the cranking cylinder pressures are low because of the ST2 cams.

[MonsterHPD]

I think the cranking cylinder pressures are low because of the ST2 cams.

That could well be a factor. I do think I´ve done a cranking test at some time before I did the modification, but I don´t remember any numbers and I can´t find any notes. So as long as the numbers ar consistant and even between the cylinders I´ll be content :-)   

[koko64]

  Yes its all good and starting will be easier too as those cams will bleed off some cylinder pressure at cranking speed. The benefit is at other parts of the rev range as the dyno shows.  Guess it's a case of cranking and mechanical compression Vs Dynamic and Potential compression.

We fixed a very hi comp 944 Superlight that killed its starter motor and sprague bearing by using hotter cams from a 900ie (Speeddog sold them to me .). It was the highest compression desmodue street motor I had dealt with at 12-12.5 : 1. Reducing cranking cylinder pressure solved the starting problem and increased peak hp. The ST2 cams leave room for more compression and big bore cylinders for the next build

[Howie]

I had no idea the ST2 cams were that hot.  What a wonderful way to increase cranking speed!

[koko64]

That Superlight could barely turn over after a few squirts of the FCR accelerator pump, comp must have been sky high with the fuel in the chamber. I remember thinking, "that bike could use some more cam!"

The 900ie and ST cams are the hot oem desmodue cams. A curious choice for a sport tourer though, you'd think 900V cams would have been better for the ST2. The ST2 cams have more duration than even the 900ie. I was surprised when I read the Bikeboy cam chart (which is like the great library of Alexandria for ducatista).

I'm looking at some 900V cams (and valves) right now, and at my 750..

[MonsterHPD]

.......

I'm looking at some 900V cams (and valves) right now, and at my 750..

I hope we will see a thread on that soon :-)

[koko64]

I hope we will see a thread on that soon :-)

Now that's a waste of money!

[MonsterHPD]

 

Now that's a waste of money!

[koko64]

How is the summer riding and testing coming along?

[MonsterHPD]

How is the summer riding and testing coming along?

Thanks for asking 

To be honest, there has not been all that much of riding and testing. We´ve had a cold spring, and now we´re having a quite warm summer (but nothing compared to what I see in the news from the US and also Australia, of course). The riding urge is not as strong as it used to be, I suppose I´m getting old and slightly lazy ...

What riding I have done has been very good, with the mapping we did last fall it runs much nicer, and I find the altered power caracteristics entertaining. Of course I would have preferred to have the higher low-end torque of the stock motor as well as the added top-end of the tuned motor, but you can´t have it all, I suppose ...    

I will probably leave the monster pretty much alone for the time beeing, as any further significant improvements would require major modifications. Maybe at some point I´d consider "proper" hi-comp pistons. I´ve stayed away from that so far so I could still run the low-octane fuel (95 RON, I think), but starting August 1st, Sweden (by government mandate) will go from E5 to E10 fuel, so I will only use the 98-octne fuel after that. So whenever I might decide to do something, I suppose hi-comp pistons would be the logical next step.

Most of my bike-related activities are now concentrated on the HYM1100 motor in my track day bike, I will eventually post an update in that thread.

Kind regards,
Torbjörn.       

[koko64]

Cheers

Look forward to that update too.

[MonsterHPD]

Thanks, and cheers to you as well!

 

Torbjörn.

[MonsterHPD]

Hi all,

I just got this photo from a friend, with the questions "it should not be like this, should it ...". I suppose this is an illustration to what might happen with the "damped" clutch / primary transmission assemblies  ...

Clutch mishap by torbjörn bergström, on Flickr

[Duck-Stew]

Wasn’t the best design, that one…