Another no-Monster build thread

[ENGAKATS]

Hello,
Since I have made a post on the german forum already, I did the lazy thing and plugged that text into Google translate, and used that as a basis. Some corrections, but it actually went better than I expected …..
Anyway, with all 2024 racetrack activities done, it's time to make some kind of evaluation. It's fair to say that the results are a bit mixed, but for the most part reasonably positive. At least no accidents and no mechanical problems (at least as far as I know).
 
 I achieved my best result on the small Kinnekulle Ring circuit. In the old days, when only “tubular frame Ducatisâ€� existed, a lap time under 1:00.0 was considered very good and almost looked on with awe in the club. Nowadays, with the "modern"Ducatis, , the fast guys in the club do times around 56 or 57 seconds on their 4-cylinder machines.
 
This year, I did a best lap time of 1:01:77, and I'm pretty happy with that. There are some factors in my favour here: There are no stop-and-go corners and almost no turns to the left, both of which I have problems with (and need to work on). On the other hand, this course is not a course where most people are willing to ride with a knife between their teeth;  the Armcos are very close in some places, and the sand traps are filled with very coarse material. Something always breaks, both on rider and machine if you land there.
 
We then went to the Mantorp course for 3 days with the other organizer where I usually drive as an instructor in the slowest group. It's fun for me if I can help even slower pilots achieve a relatively clean line, but it really ruins my own driving.
 
 However, I  swapped with one of the other instructors and got  few clean stints. This time it was pretty calm in terms of wind conditions, so a few more recordings from the lap timer: One from the 2023 Club Championship, and one from my best stint at the 2024 final track day. The specifications were slightly different:
 
2023:
DP camshafts
Original 45mm throttle bodies
Rear sprocket 39T
Speed limiter 9100 rpm
 

2024:
 ByTe Therapy camshafts
 Throttle valves 50 mm (from the hottest “Old-Monsterâ€� 4V)
 Rear sprocket 38T
 RPM limiter 9200 rpm

On the first laptimer recording you can see from the marking that I hit the exit chicane equally badly both times, so I started on the straight with almost the same exit speed.

Mantorp 2023 vs 2024_X01 by torbjörn bergström, on Flickr
 
At the end of the straight, where it goes slightly downhill, I reached a speed of 212 kmh at the second marking in 2023, in 6th gear (red curve); I think absolute maximum that year was 216 km/h.
In 2024 I reached a top speed of 220 kmh, in 5th gear and with the limiter (yellow curve). The absolute maximum was 222 kmh.

Mantorp 2023 vs 2024_X02 by torbjörn bergström, on Flickr
 
The last few stints I tried to shift a little earlier in 6th gear instead of turning in 5th, but the Starlane stopped working, so I don't know what the result was.
 
It's a little difficult to draw hard conclusions from this because the specs are different. But I think the engine has gained a bit...
 
If you look at the curves, you'll notice how much you lose when changing gears, even though I think I  shift fairly quickly. I drive “full analogueâ€�, no quick shifter, no shift light, no slipper clutch. Maybe I should think about a QS... and it would be interesting to see what that looks like with a seamless gearbox.

Over the autumn, I´ve spent quite a bit of time on the down-draught heads, a colleague on the german forum has helped me get the +2 mm / +1 mm valves installed (beautiful work). Unfortuntely´, I´ve also spent a lot of time working on the flow bench, and I now have installed flow laminarization elements in the “cylinder / suction� tube, switched to a laboratory power unit (in order to maintain a constant 5V supply to the HFM), and installed voltage displays for both the supply voltage and the measurement signal from the HFM. I hope that will work OK for now.

The porting work I have done, have all been on the plaster model, which as-produced gave flow values pretty similar to the actual alu head it as made from. Since I am pretty new  to this, and since flow alone does not necessarily produce any more power, it´s all a bit of a guessing game, but I hope some good will come from it, and that I will gain some good knowledge.

20250120_073755 by torbjörn bergström, on Flickr

Kind regards,
Torbjörn.

just saw this

great information sharing, very much appreciated!

looking forward to what this riding season brings (to our screens, for us following this one)