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Message-ID: <001801c8fb32$8cdb0680$6400a8c0@george>
From: "George Lendich" <lendich@optusnet.com.au>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-3069852@logan.com>
Subject: Re: [FlyRotary] Re: exhaust manifold
Date: Mon, 11 Aug 2008 07:46:27 +1000
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Michael,
You certainly done some research on carbs if those sites are any indication, 
but I only had a quick look so far.
I worked out, from my single calculations of 44mm, that the 3 x 34mm were 
marginal ( for a 2 rotor) and may be good to 165hp only, where as the 3 x 
36mm would get you to 180 hp. These are only rough calculations - do you 
know what size Tracy used and what HP he was getting. If 160 hp is enough 
then that's fine.
George (down under)

> George:
>
> I must apologize I got the model and make wrong. As a kid in Venezuela I 
> was
> a Bultaco trials rider and not up to speed on the japanese street bikes.
>
> The carbs came from a Yamaha XS 750 not Suzuki. They were also used on the
> 1100cc bike in a set of 4 and a set of 2 for the smaller bikes.
> It is a constant velocity diaphragm type carb.
> The carb model is the Mikuni BS34-11 2H7-00 CD
> (34 denoting the throat size in mm)  I believe I figured that ideal for 
> the
> 13b would be 3 carbs in 36mm but this was as close as I could get.
> http://www.dansmc.com/carbs/Japanese_Carbs/Mikuni_Yam_XS1100.htm
>
> They are Mikuni type II carbs that were stock on the 1978-79 XS 750 bikes
> the 76-77 XS used Mikuni type 1 carbs and the 80-81 XS used Hitachi carbs.
> The type II carbs will fit all years and models of the Yamaha XS and
> generaly considered the best of all the three types used. They are easy to
> work on and parts are readily available.
>
> A good guide on carb sizes and what bikes wear them may help you pinpoint
> the right model and zise to look for, for your single rotor.
> http://www.cyclewareables.com/pages/street_carburetor_menu/carburetors_street_menu.htm
>
> here are a few handy links for the BS 34 carbs
> http://www.mikesxs.com/mikesxs-fuel_system.php?category_id=4.3
> http://www.factorypro.com/tech/carbtun.html
> http://www.dansmc.com/carbs/Japanese_Carbs/Carb_pics.htm
> http://www.crc2onlinecatalog.com/misc_carb_parts.htm
> http://www.xs11.com/tips/maintenance/maint30.shtml
>
> Michael in Maine
>
>
>
>
>
>
>
> ----- Original Message ----- 
> From: "George Lendich" <lendich@optusnet.com.au>
>
>>
>> Michael,
>> 3 x 34's would do it for a 2 rotor. I have been looking for a carb for my
>> single but would require a 44mm and thought a couple of smaller carbs
> might
>> do it - the bigger carbs get expensive. The only problem with more than
> one
>> carb is you need to balance them, but for a ingle rotor they could be
>> staged.
>> I didn't know the Suzuki's had Mikuni carbs, I might look out for some of
>> those.
>> George ( down under).
>>
>
>
>
> --
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