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Post by biblebasher on Nov 17, 2008 18:37:51 GMT
hello chaps, any structural engineers out there? i have this divvy frame just sitting there and my mate has a TDM850 and a knackered motor. we sat tdm engine in divvy frame and it fits really well! trouble is, tdm engine is hung from above. can i attach additional brackets under the motor where the crash bungs fit or is that asking for trouble?
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Post by beeblemaster on Nov 17, 2008 22:21:30 GMT
Can't help but what a great way to improve the divvy ;D Would be interesting to know how you get on, if it is possible  |
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Post by teejayexc on Nov 17, 2008 22:38:44 GMT
hello chaps, any structural engineers out there? i have this divvy frame just sitting there and my mate has a TDM850 and a knackered motor. we sat tdm engine in divvy frame and it fits really well! trouble is, tdm engine is hung from above. can i attach additional brackets under the motor where the crash bungs fit or is that asking for trouble? Why would you want to fit a knackered motor in it anyway  |
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Post by amorti on Nov 18, 2008 0:34:05 GMT
The bracket bottom-front of a TDM motor looks like it's only made to hang a belly pan off.
If however it's 'ard enough to hang a sump bash-guard off, it ought to be 'ard enough to mount the engine by. The divvy engine mounts are just thick plates bolted to the frame, so piece of cake to replace with modified ones.
I can't see any other insurmountable reason why it wouldn't work. But remember, if those mounts aren't up to it, you can't exactly add mounts to an engine. It needs serious strength, and I'd bet it'snot possible (really, easily, or cheaply) to weld to a cast set of crankcases, at least not without distorting them past useless or blowing through them. The only other issue would be chain-run. But that can usually be bodged with spacers rear and/or front.
Not sure quite what your end result would be though, nor if it'd be worth having. It couldn't be a lot better than a 900 divvy, and it'd be chain drive, in a wobbly frame with wobbly forks, questionable geometry that wobbles at speed anyway, and cheapy cheapy suspension. And ask yourself if you want that sort of power through a 130/70-18 cross-ply, too.
I think the D600 basically is about the limit of its power handling capability with the 60bhp it has.
I'd put the bits down, and think of another game to play.
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Post by charlietbird on Nov 19, 2008 15:40:36 GMT
I'd have a go just for the hell of it! Charlie  |
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Post by General Gman on Nov 19, 2008 16:03:56 GMT
You'd nee to use the stock mounts I would think - Parallel twins do vibrate quite nastily.
Also you could get problems with the chain run - may need to fabricate an extended output shaft.
Don't think power would be a problem - the TDM doesn't knock out that much more than the divvy, TBH.
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Post by amorti on Nov 19, 2008 18:17:47 GMT
In the TRX the engine makes 85ish bhp (I'm not sure about in the TDM?), which is 20 more than the D6, and a bag more torque. I reckon the divvy is bendy enough that once you get above the speeds it's already capable of with its own engine, you'll have issues.
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Post by biblebasher on Nov 19, 2008 20:18:03 GMT
TRX? now theres a cracking bike! love one of those instead. as to my lash up idea, they dont always make sense but they are different. my very first lash up was a yz 465 crosser motor in an rd400e chassis. went like hell, couldnt handle. eventually put engine back where it belonged to be on the safe side.
thanks for the feedback. my main concern is stress on the upper frame where there shoudnt be. looks great though. will post some pics when i get my 10 year old to show me how to use my new digital camera...
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Post by CD on Nov 20, 2008 19:44:26 GMT
If the TDM engine is built to be mounted from the top so will have a strong top frame rail. The Divvie 600 engilne is mounted at the bottom so the frame wont be that strong at the top. And the Divvie brakes suspension etc wont cope with much more power. How about building a new frame to your own design (or rip off this one). That really would be worth seeing.  For strength its all straight tube so wont need special pipe benders or fancy joint lugs. The short swing arm keeps it rigid at expense of suspension travel. |
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Post by biblebasher on Nov 20, 2008 22:11:06 GMT
frame building is definitely way out of my league! maybe strengthening the existing frame might be better. tried a fazer swingarm today for trial fit, but forgot that fazers are rising rate with bracket underneath. will try slotting a fazer wheel in instead.
by the way chiro, as an xl250 owner, if you know of a TL125s engine or bottom end, let me know. not the 122cc barrel version though. ta
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