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Old 03-11-2012, 05:34 PM   #131 (permalink)
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jvsgears - '14 Skoda Octavia
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Some recent pictures of the Suzuki
Riding with this nose improvement is a pleasure. Less influence from side wind and turbulence when siding behind a truck.
Next plan is to improve the back side , probably it will be a tail in Vetter style.
My typical MPG is 80. But most of the rides are short and in cold weather conditions, which is not a real help to reach nice figures.

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Old 03-11-2012, 08:26 PM   #132 (permalink)
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Good to hear from you again, do you think your bike could meet the Vetter Challenge? Will the new tail section get you to 2.3L/100km?
I am working on my Honda VT500, building a full "dustbin" fairing to see if I can meet the Vetter challenge. I feel quit confedent I can get to 2.5L/100 but 2.3L/100 may take much more development time.
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Old 03-12-2012, 08:10 AM   #133 (permalink)
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redyaris.
My best till now was 2.69 l/100km
Three things make me believe that 2.5 or even 2.3 is achievable. The new tail.
Long rides in the summer . Reworked conical discs, they are worn on there surface by the belt rubbing. And probably a new belt, the one I am using now is under the wear limit of the Suzuki workshophandbook data.
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Old 03-12-2012, 08:21 AM   #134 (permalink)
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About how many km do you get out of a belt and pulleys?
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Old 03-12-2012, 06:01 PM   #135 (permalink)
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Pulleys and belt last for about 30000 km. I can correct the pulleys on my lathe. New belt is on order. With only the pulleys corrected it is already noticeble that the revs are dropping which will help my MPG number.
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Old 03-12-2012, 07:15 PM   #136 (permalink)
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Quote:
Originally Posted by janvos39 View Post
sendler
Pulleys and belt last for about 30000 km. I can correct the pulleys on my lathe. New belt is on order. With only the pulleys corrected it is already noticeble that the revs are dropping which will help my MPG number.
So that is no worse than a chain. It's cool that you were able to meet Craig Vetter and are promoting the streamliner movement in your part of the world. I have my CBR250R to mod but am also considering an SH150i as there is only so low you can get the seat height on a sport bike frame.
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Old 03-13-2012, 04:54 AM   #137 (permalink)
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Seat height is very important not only for lowering the frontal area but also handling in crosswind. But you already are aware of that I suppose.
But I think best MPG results come from a low seat height in combination with a normal gearbox. Some losses in the CVT drive come from the rubber belt and are higher than losses from metal contacts like chain or gear.
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Old 03-13-2012, 08:12 AM   #138 (permalink)
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Quote:
Originally Posted by janvos39 View Post
Sendler
Seat height is very important not only for lowering the frontal area but also handling in crosswind. But you already are aware of that I suppose.
But I think best MPG results come from a low seat height in combination with a normal gearbox. Some losses in the CVT drive come from the rubber belt and are higher than losses from metal contacts like chain or gear.
Actually, on my bike , I think the exemplary sidewind self correcting tendencies result from a highish cg with low polar inertia about the roll axis due to my anchored tuck. As riders of high suspension adventure bikes such as the BMW GS will attest to. It is easy for changes in lean to arise from the various forces to immediately countersteer the wheels away from the wind. A smaller and more comfortable frontal area comes with the lower seat and feat forward position though.
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Old 03-14-2012, 07:03 PM   #139 (permalink)
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Reduction in bore means higher CR or did you work that out to keep it the same (for reliability's sake) ?

(sorry if I missed this point while catching up)

Also, porting :
I read somewhere that FE is boosted if the exhaust port and them only get a full race treatement.
Did you do some porting on your 250 head ?
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Old 03-15-2012, 04:37 AM   #140 (permalink)
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renault megane dci
I didnot rework the compression space because longer term I have a plan to copy the Toyota prius system where the inlet cam is rotated for later closing. For that I need a higher compression ratio. I did the porting on a flow bench as can be seen on page 8 of this thread. The inlet flow graph is given. The exhaust had sufficient flow for the amount of power which I use on the scooter. So no work has been done on that.

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