Fitting a Ducati 1000/1100 DS crankshaft to an ST2, M900 or 900SSie
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- เผยแพร่เมื่อ 29 มี.ค. 2024
- Stroking an ST2 from 68mm to 71.5mm using a 1000DS crank to increase the capacity to 992cc, same as a 1000DS engine. Specifically for the 3 phase alternator engines that were M900 and 900SSie model year 1998 and ST2 model year 1999 running 94mm bore.
Keep in mind the M900 and 900SSie are 92mm bore std, so you need bored and plated cylinders, modified ST2 cylinders or you could possibly keep it 92mm bore and modify the original pistons. Or have some new ones made. It's only money.
Including the following details and rambling thereof:
Mods required to the crankcases to give the crank clearance.
Checking piston crown volume to work out compression ratio (and how to get it wrong).
How to machine pistons to lower the compression.
Dyno results, fuelling and spark map changes.
How you would do it to a single phase alternator (pre 1998 model year) engine.
Whether or not the water cooled heads are stiff enough to not warp with the increased cylinder pressure.
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Quality work very interesting.👍
951 and 992 based on 904cc are really a great engine. I've build 10 and I love the torque of this engine
cool. have you just machined the 92mm pistons? certainly the cheapest option - having a pair of pistons made out here is quite expensive. gets rid of some weight too. i guess you could lift the cylinders a little too.
You're single-handedly creating a Ducati tech out of me. Thanks to many of your videos, I have been able to finnagle my way around a 90's Monster that bounced around local shops for a while. I have noticed that many videos still apply across multiple models, which makes watching for the fun of it even more rewarding.
Thank you for the library of knowledge you're translating into understandable videos. I would like to store your videos on a backup drive in case something ever happens to your channel, would you be okay with that?
the way i see it, once the video is published you pretty much lose control of it. like the comments section and the lunacy that shows up there sometimes. it's just a public forum.
Great video
Interesting. Can you yae the toyota rods for anything they are 122mm centres
the 900/1000 rods are 130mm c/c, so 122 is way too short. if you go much shorter on rod the pistons will hit the crank at bdc. although the st3 works with 124mm rods, but those pistons are quite short under the pin.
I'm interested to see what can be done with a 1999 750ss ie.
Not that I wanna rebuild my motor right now but I wondered if they will benefit from a few top end tweaks.
the 750 engine was a victim of its place in the line up. it had to be less powerful by a margin compared to the 900. as such, it's a bit of a dog. the 800 shows what the 750 could be with bigger valves, better cams and more comp. this is my take on it - www.bikeboy.org/brads750m.html
@bradthebikeboy thanks for the reply man. Il have a good read of that.
After having a good read through the article you linked I wondered if you could tell me more about the narrowed 900 cranks? Or if you have an article on that?
@@Daniel_D_King it's a 900 crank with the same alternator snout length as the small block. not much else to it. fitted to 900ss up to some time in 1992 i think. i put it in 600 cases once. think it's in the blog? have to have a captain cook. found it. bradthebikeboy.blogspot.com/2014/04/fitting-2003-onwards-696796800-6-speed.html
Are the cylinder heads the same on the 1000ds and 1100ds? I was looking for used parts on my MTS 1000ds and found the head from the 1100ds, will it fit? Thanks!
you can use parts catalogues to try to work it out. depends on the year. possibly due to the lh cam bearing change. www.bike-parts-ducati.com/ducati-motorcycle/assignment_spare_parts/30122331A
www.bike-parts-ducati.com/ducati-motorcycle/assignment_spare_parts/30120921D
@@bradthebikeboy Thank you for your reply! Yes, I saw these diagrams, but I don't get the difference between years of 1000ds engine, I thought that 1000ds was the same through all the years. (1100 was 98mm, instead 94mm of 1000 bore) So, the difference between 2006 and 2005 of 1000ds, except just part numbers, is not obvious for me...
@@konstantinbedin9891 nor me. i would expect them to be functionally the same.