Mtrhd0024
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| posted on 26/4/07 at 08:59 AM |
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Yamaha VMax Locost...
As you can probably see, I'm relativly new to the forums here. Been lookin at the site for a while but only recently joined.
Anyhow on to the subject at hand... Has anyone built or heard of a locost built with a Yamaha VMax Engine?? I did a bit of research on the forum and
found that someone brought up the subject but never seemed to go through with the project. I also heard it spins the wrong way for most conventional
diffs, but I cant imagine it would be too hard to find a diff that would be suitable. I'm interested in building a bike engine car and think a
Max motor would be cool. It sounds sweet and the bottom end is heavily over engineered so it should be capable of handleing 200 HP reliably. Its
also shaft drive already so no converting is needed. I just want to check out/know about any problems people might have had with useing one. Any
insight is appreciated-Thanx...
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mangogrooveworkshop
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| posted on 26/4/07 at 09:10 AM |
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Mk have done shaft drive sevens for the dutch lads. All they did was flip the diff over and that sorted the wrong way round rotation problem.
welcome to the mad house by the way
[Edited on 26-4-07 by mangogrooveworkshop]
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BenB
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| posted on 26/4/07 at 09:21 AM |
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My ST1100 is shaft drive. Pretty easy really- just make a sleeve that fits over the cut-down shaft and inside a cut-down propshaft and weld it all in
a place.....
Vmax would be nice- there's a nice blower kit for it too 
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Browser
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| posted on 26/4/07 at 10:10 AM |
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I believe I've expressed the opinion that Vmax motors are an overlooked gem on a few threads discussing bike engined cars. OK, so the
design's a few years old now and, when compared with some 'big' sports-tourers now isn't the biggest, but as you say
it's got a good rep, sounds fab and has quite a big aftermarket tuning following. Go for it and tell us what it's like
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BenB
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| posted on 26/4/07 at 11:36 AM |
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The only advantage of going for a super sports bike is the engines are sometimes easier to come by thanks to born-again bikers not realising that
things have changed since they road a 250cc Yamaha!!!
Spares and upgrades for the ST1100 are sometimes equally difficult to get hold off because their riders are less likely to DIY than sports bikers who
might be more enclined to fettle and put on aftermarket parts... As you say, the Vmax does have a tuning scene, though, which is an added
advantage.
Oh well. I'd say go for it. It's nice to see unusual engines being used (STM's V-twin springs to mind)...
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trikerneil
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| posted on 26/4/07 at 12:28 PM |
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I'd be wary of just flipping the diff over some don't like it.
Bin there done that, then had to rebuild the backend of my Trike 
If the VMax has a middle gear box the same as the XS1100 then it can be modded to turn the "right" way.
See the "My Trike" page on my website for ideas.
ACE Cafe - Just say No.
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goodall
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| posted on 26/4/07 at 12:46 PM |
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depends on the diff you opt for if you go for a old fashion diff you dont have the probalem presented by the likes of a siera diff. many older diffs
can be fliped and not worried about because there a stright cut basically, the thing is many wont handle the power
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Mtrhd0024
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| posted on 26/4/07 at 12:47 PM |
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Thanks for the help so far... yea i'm not sure i'd go for the turning over the diff idea... sounds like a bit more trouble and possible
problems than its worth. Supposidly some of the older japanese cars like Hondas for instance have diffs that would be suitable for use with a Max so
that would be an idea. Does anyone here think that the VMax engine would have trouble as far as oil sloshing or distributing evenly in the corners??
I know this can potentially be a problem in some bike engines since they were not designed to be held upright in the corners, but i was just wondering
what you guys think...
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locoboy
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| posted on 26/4/07 at 02:36 PM |
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With reference to the iol problems, you would need to get onto a v-max forum and ask some trike builders.
There are official trike conversions for the v-max so it would be worth contacting one of the companies that do this work and see if they fit baffle
plates or they dry sump it etc etc...
A mate of mine built a 3 wheeler kit car with a V-max driving the 2 front wheels.
it was a poo car and all it did was wheelspin!
Had it been engineered correctly then it could have been made to work i reckon.
that was running an upside down sierra diff and it sounded like a car reversing all the time - horrid!
ATB
Locoboy
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Mtrhd0024
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| posted on 17/9/08 at 09:53 PM |
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Okay, well I realize I'm bringing up an old thread here, but I think most people prefer that to starting a new thread. I'd just like to
hear people's opinions on the Vmax idea again...
Now that after 23 years, Yamaha has introduced a totally new model
For those of you who don't follow bikes, its now 1600cc's, up from the old 1200. HP is now up to 200, but pretty much all the amazing
things about the old bike/engine remain. As always, there's TONs! of torque for a bike engine.
The launch has been announced for November I believe, but give it a few months and I suspect a few engines will start popping up after people crash
their 200hp monsters.
Also with the cult status of the old bikes, the new engine is destined to end up with loads of tuning parts.
I'm still a believer in a Vmax locost. I think it needs to be done
I'm moving back to America in another 9 months (in the mean time, let the 09' Vmax crashing begin  ) and then I'll be building a
Locost as my university gap year project. I'd say that'll impress my admissions officer, considering I'd like to get in for
mechanical engineering. Not to mention, I'd have a pretty amazing car to drive around at university.
I'm only 17 at the minute, however I'm assisting with the construction of a friends locost (it was because of me he was bitten by the
locost bug) and have a lot of other experience working on cars, and especially motorbikes so I feel confident I can do it.
For those who insist I'm too young and inexperienced (not to brag, but for some reason people always seem to insist I know nothing about
anything because I'm only 17) watch this video of what I did in 4 weekends last year:
http://uk.youtube.com/watch?v=YQ1PZg2ou6U
So anyway, what do ya think? Should I shoot for a Vmax locost? From what I can tell, it'd be unique!
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