Ducati Monster Forum

powered by:

January 19, 2021, 04:34:43 AM *
Welcome, Guest. Please login or register.

Login with username, password and session length
News: Please read me
 
  Home   Forum   Help Search Login Register  




Pages: 1 ... 11 12 [13]   Go Down
  Print  
Author Topic: Another no-Monster build thread  (Read 23337 times)
MonsterHPD
Hero Member
*****
Offline Offline

Posts: 512



« Reply #180 on: April 28, 2020, 01:08:31 PM »

Its good having the Germans so close to consult, they are doing great parts and making good power with 2 valve motors. waytogo

Yes,
there are many 2V track bike projects in Germany (as well as Kämna, of course;; I have not checked in detail but presumably because of a suitable race series. One bike for sale now, not very dissimilar to mine, but based on an 848 frame, weighs in at 136.5 kg dry, motor 51.8 kg. Corresponding numbers for mine are about 162 kg / 62 kg, respectively.
That shows 1) the difference in weight between up-to-999 Ducatis, and 848/1098 onwards, and 2) the difference between a determined effort to focus on weight, and a more relaxed approach (mine).

Still is interesting to see the difference. Basically my 749-based bike has all the "normal" light parts, and compared to a 749 /999 it´s pretty light, but not compared to what could be achieved. Next time .....

Anyway, Covid19 diversion project is ongoing, ring gaps (and squishy) to be adjusted. First observation upon dissasembly: My goal to start rich / safe seems to have been achieved ...

20200427_194333 by torbjörn bergström, on Flickr   
Logged

Monster 900-2002 (sold, alive and well in the UK), 749R / 1100 HYM combo for track days, wifes / my Monster Dark 800-2003 (not entirely "Dark" anymore and a personal favourite) , 50% of 900SSie -2000 track bike for rainy days-soon with tuned ST2 motor and Nemesis ECU.
Duck-Stew
Local Moderator
Hero Member
*****
Offline Offline

Posts: 8998

‘99 M900 Coup D’etat bobber


« Reply #181 on: April 28, 2020, 02:13:28 PM »

Lookin’ good otherwise!
Logged

Some bikes, memories, fun and good friends.
koko64
Post Whore
******
Offline Offline

Posts: 14468


« Reply #182 on: April 28, 2020, 04:13:48 PM »

Impressive power to weight numbers.
Logged

1999 M750.    "Scrambler"
2013 M1100 Evo    Street
2004 GSXR 750     Track
MonsterHPD
Hero Member
*****
Offline Offline

Posts: 512



« Reply #183 on: September 04, 2020, 03:15:38 AM »

Just in case someone´s still interested, time for an update.

As I took the top end apart, I noticed that one of the rails of one oil ring looked a bit strange, and closer inspection showed it was half broken. Presumably the damage was done when assembling the motor; since the lower end of the liners in a HYM motor is irregular in shape, getting the pistons with rings to enter the cylinder without one or other ring end snap out and snag on the liner was very tricky, and very frustrating. And obviously not entirely successful.

Anyway, looking around for piston rings, it turned out that I could buy a set from Kämna, but they did not have them on stock, and Pistal could not deliver until mid-june.
At the time, Covid19 was at its height in many countries, including Italy, so I had my doubts about that delivery promise.
Here in Sweden, track days were cancelled with no re-start plan, so I decided to park the track bike for this year.

As it turned out, the package from Kämna arrived in late June, and track days have been carried out pretty much as usual from early july onwards.  But by then, I had already decided to park the bike, and started investigations to make a pair of down-draft cylinder heads for the HYM motor.
I found some inspiration in a thread on the Ducati.ms forum, and I´ve had a lot of info from the person behind that thread.

https://www.ducati.ms/threads/my-aircooled-1100-downdraught-heads.728303/#post-7050557     

As I have a scrapped cylinder head from a friend to try this out on, I have started to do some CAD drawings for a cylinder head jig to hold the head on the milling machine. If this test ends favourably, I will go on with the proper heads during the winter. If not, I´ll assemble the motor again as-is, more or less.

I have alredy started hoarding parts, first up a set of throttle housings from the RS Monster:

2020-07-30 17.19.26 by torbjörn bergström, on Flickr

If I decide to go on, I will probably order cams and valves (inlet +2 mm, exh. +1 mm) from Kämna.

 And, to (hopefully) avoid the assembly problem next time, I´ve made an improved (?) version of the piston ring compressor sleeve:

20200526_200917 by torbjörn bergström, on Flickr

As there will be lots of small issues to solve and parts to fabricate, and it may not be finished in time for next summer.
Further, the motor in our trusty old rain bike decided it was finally time to go (80k or so km, last 20k or so as a track bike).

2020-07-22 19.52.47 by torbjörn bergström, on Flickr

So we are now working on some necessary modifications in order to fit the tuned ST2 motor I´ve had in the corner of the garage since that project petered out around 2012, 2013. That should hopefully be enough to be fun on our tracks, and a bit faster than the M800.

2020-08-19 19.21.46 by torbjörn bergström, on Flickr

Hopefully, at least one of these projects will be in working order for next summer  Smiley
Logged

Monster 900-2002 (sold, alive and well in the UK), 749R / 1100 HYM combo for track days, wifes / my Monster Dark 800-2003 (not entirely "Dark" anymore and a personal favourite) , 50% of 900SSie -2000 track bike for rainy days-soon with tuned ST2 motor and Nemesis ECU.
Duck-Stew
Local Moderator
Hero Member
*****
Offline Offline

Posts: 8998

‘99 M900 Coup D’etat bobber


« Reply #184 on: September 04, 2020, 04:16:25 AM »

Nice update!  I’m curious to see what becomes of the cylinder heads
Logged

Some bikes, memories, fun and good friends.
MonsterHPD
Hero Member
*****
Offline Offline

Posts: 512



« Reply #185 on: September 04, 2020, 05:03:46 AM »

Nice update!  I’m curious to see what becomes of the cylinder heads

Well, so am I :-)
Logged

Monster 900-2002 (sold, alive and well in the UK), 749R / 1100 HYM combo for track days, wifes / my Monster Dark 800-2003 (not entirely "Dark" anymore and a personal favourite) , 50% of 900SSie -2000 track bike for rainy days-soon with tuned ST2 motor and Nemesis ECU.
greenmonster
Hero Member
*****
Offline Offline

Posts: 1119


« Reply #186 on: September 05, 2020, 03:25:44 AM »

Quote
Further, the motor in our trusty old rain bike decided it was finally time to go (80k or so km, last 20k or so as a track bike).  

Ouch!
What happend, valve broke off?
Logged

M900 -97 
MTS 1100s  -07
MonsterHPD
Hero Member
*****
Offline Offline

Posts: 512



« Reply #187 on: September 05, 2020, 04:12:24 AM »

Yes, a valve broke, after some persuation by the piston ....

It was actually a bit strange. The cam pulley had worked loose, but the nut was still in what seemed the normal position on the cam, and it was not loose, still
green-Loctite locked to the cam. It´s been there since 2007, so it did come as a bit of a surprise .... Huh? 
Logged

Monster 900-2002 (sold, alive and well in the UK), 749R / 1100 HYM combo for track days, wifes / my Monster Dark 800-2003 (not entirely "Dark" anymore and a personal favourite) , 50% of 900SSie -2000 track bike for rainy days-soon with tuned ST2 motor and Nemesis ECU.
MonsterHPD
Hero Member
*****
Offline Offline

Posts: 512



« Reply #188 on: January 13, 2021, 01:26:21 AM »

Hello, all.

Covid still raging, I hope you are all well out there.

I suppose it would have been possible to get more done in this time, but as noted before, life is not just motorcycles.

I have progressed a bit with the down-draft project. The jig parts have arrived and worked as planned:

20201117_195912 by torbjörn bergström, on Flickr

The machining on the scrap head also went more or less as planned:

20201229_183719 by torbjörn bergström, on Flickr

I´m now waiting for some 6060 or 6068 alu bar to arrive to machine the weld-in stub. I will let this take it´s time, I plan on building a flow-bench so I´ll have some numbers to guide me while doing the finishing job.

For the coming summer, I will use the heads from a bike that ran on our track days 8 or so years ago, and via several owners landed in the hands of my buddy. The were made by a then-wellknown person and ran very well. They are ported and inlet valve is +1 mm, otherwise stock. Interestingly, the exhaust ports have also been filled out slightly so the port is effectively slightly raised.

20210106_152233 by torbjörn bergström, on Flickr

20210106_152607 by torbjörn bergström, on Flickr

20210106_164717 by torbjörn bergström, on Flickr
  
If you want to know more about this motor, you can check this thread:
https://www.ducati.ms/threads/graphs-of-the-1123cc-sc.86311/  

In the meantime, I decided to clean up the electrics and get rid of all the extra length of wires. The unused wiring was already removed, but the HYM wiring has a lot of wire in it ...

Start:
2020-09-30 08.48.12 by torbjörn bergström, on Flickr

Intermediate:
20201225_215108 by torbjörn bergström, on Flickr

Final (hopefully):
20210102_183953 by torbjörn bergström, on Flickr

It never turns out quite as nicely as you´d hoped ...

Well, that´s about the current status. Stay well, all.
  
« Last Edit: January 13, 2021, 01:45:53 AM by MonsterHPD » Logged

Monster 900-2002 (sold, alive and well in the UK), 749R / 1100 HYM combo for track days, wifes / my Monster Dark 800-2003 (not entirely "Dark" anymore and a personal favourite) , 50% of 900SSie -2000 track bike for rainy days-soon with tuned ST2 motor and Nemesis ECU.
koko64
Post Whore
******
Offline Offline

Posts: 14468


« Reply #189 on: January 13, 2021, 03:02:27 AM »

Thanks for the update. Interesting links.
Logged

1999 M750.    "Scrambler"
2013 M1100 Evo    Street
2004 GSXR 750     Track
diamonddog-2
Full Member
***
Offline Offline

Posts: 176


« Reply #190 on: January 13, 2021, 08:11:38 AM »

Fascinating.  Thank you for sharing.  Soooooo glad this forum exists and that I get to pick the brains of some REALLY talented people.

 bow down
Logged

2001 M900S ie   2002 Aero 1100
"What are YOU rebelling against?"  "I dunno. Whatta ya got?"
Pages: 1 ... 11 12 [13]   Go Up
  Print  
 
Jump to:  


Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines
Simple Audio Video Embedder
Valid XHTML 1.0! Valid CSS!
SimplePortal 2.1.1