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Post by knowledge on Feb 5, 2008 23:50:59 GMT
I understand this has been done before. Can anyone help? Some photos would be useful.
I have seen Polini 165cc barrels for the Mito, but in the meantime, I have acquired a 125 barrel (knackered) to help me set this up.
Thanks.
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Post by noride on Feb 7, 2008 20:12:32 GMT
im thinking of doing a aprilia barrel smallframe . i thought about the mito aswell . if i get any info ill let you know but to be honest i think we will both after search the german and italian sites
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Post by adspeed on Feb 7, 2008 21:08:14 GMT
noride, It all depends on your basic understanding of port timings for starters mate. If ya got that then its just a few calcs to find out were abouts your barrel needs to be to gain reasonable timings and a usable engine. Plus some serious engineering of course. Funny some people have been known to doubt the possibilty of using bike barrels, knocked the chance that they might be usable, and even seen them slag peoples projects off on line. But don't listen to people like that pal, before you know it they'll be wanting advice for their own conversions. Un-ber-lievable!! Any questions mate I will be more than pleased to help.  |
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Post by hank on Feb 7, 2008 22:59:56 GMT
Funny some people have been known to doubt the possibilty of using bike barrels, knocked the chance that they might be usable, and even seen them slag peoples projects off on line. But don't listen to people like that pal, before you know it they'll be wanting advice for their own conversions. Un-ber-lievable!! ;D ;D ;D |
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Post by knowledge on Feb 19, 2008 23:56:23 GMT
im thinking of doing a aprilia barrel smallframe . i thought about the mito aswell . if i get any info ill let you know but to be honest i think we will both after search the german and italian sites Thanks NoRide. I was hoping someone had already book-marked the German sites, and would be able to supply the URL. Maybe someone still will.... When I picked up a knackered Mito barrel, I also acquired an Aprilia barrel in a similar condition, just for comparision purposes. I favour the mito as the water cooling is better confined to the barrel (the Aprilia has a big hole in the bottom of the water jacket that flows into the Aprilia crankcase) and the Mito power valve looks to be easier to adapt. One advantage with the Aprilia is that the power valve can be replaced with one designed for kart use. It does not use an electrially driven servo, but a much simpler system that relies on the back-pressure in the exhaust system to overcome a pre-tensioned (adjustable) spring. When the pre-determined back-pressure is reached, the power valve opens. The problem is that it opens pretty suddenly, so the power delivery is not very progressive. It's a neat solution though, and much cheaper than replacing the Aprilia or Mito power valve servo. At least both pots use strokes very similar to the standard 51mm stroke, so they are clear of the pitfalls of using a motorcycle barrel on a scooter engine and the incompatible transfer port issues that can afflict this type of conversion. However, I think you'll find this has been covered elsewhere...... Martin |
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Post by tony on Feb 20, 2008 0:00:35 GMT
stroke/timing issues can all be got over if you know what you are doing. Do not be restricted by this. There are many rod,piston,machining,packing,pin options. Its not the end of the world.
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Post by Juan on Feb 20, 2008 0:33:31 GMT
Martin,search back this section and look for the Wombat thread.Curare doesn't visit these days to my knowledge but I'm sure he'd be happy to help if you e-mail him.
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Post by jonnysnatchsniffer on Feb 20, 2008 15:40:09 GMT
stroke/timing issues can all be got over if you know what you are doing. Do not be restricted by this. There are many rod,piston,machining,packing,pin options. Its not the end of the world. talking of which if i got a 3mm pack plate for a polini 130 and had the same lopped off the top how would this affect things in relation to transfer/exhaust port timing relation, ive looked at the old tuning manuals but they do my head in, i can port barrels no prob if i have a timing disc an port timings measurement but cant seem to grasp the concept of transfer timing in relation to exhaust timing, ie what would work well on the above barrel, sorry to hijack this thread maybe admin can put it in its own place as i cant be fucked to type it again |
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Post by noride on Feb 20, 2008 20:34:24 GMT
noride, It all depends on your basic understanding of port timings for starters mate. If ya got that then its just a few calcs to find out were abouts your barrel needs to be to gain reasonable timings and a usable engine. Plus some serious engineering of course. Funny some people have been known to doubt the possibilty of using bike barrels, knocked the chance that they might be usable, and even seen them slag peoples projects off on line. But don't listen to people like that pal, before you know it they'll be wanting advice for their own conversions. Un-ber-lievable!! Any questions mate I will be more than pleased to help. cheers mate im sure i will have a few questions for ya when i get stuck into the project |
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