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 Crank case transfer port question

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1bantamcloser2divorce

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Number of posts : 36
Localisation : Vancouver Island, CANADA
Registration date : 2009-10-06

PostSubject: Crank case transfer port question   Thu Mar 29, 2012 4:05 pm

Hello ,

I am hoping I can get some advice from the forum on perhaps what is a straightforward question. I hoping to start building up my engine. I have bought an already ported D3 barrel, which I am putting on (at present) stock D3 cases. I understand it is crucial to match the transfer ports at the bottom of the barrel to those on the crank cases.

[img][IMG]


My question is, what shape do the transfers ports need to be, below where the barrel and crank case meet? Do I widen the crankcase ports using the same angle as the origional factory ports, or is a different shape more desirable?

[img][/img]



[img][/img]

Thanks for your time!

Andy
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1bantamcloser2divorce

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Number of posts : 36
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PostSubject: Re: Crank case transfer port question   Fri Mar 30, 2012 4:42 am

Added a picture, in case I wasn't making much sense- quite likley! Very Happy
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mscutt

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PostSubject: Re: Crank case transfer port question   Fri Mar 30, 2012 6:25 am

Matching the crankcase to the barrel is definitely worth while.

Personally I would go for a large radius rather than following straight down with a small radius at the bottom.

Smoothness is more important than a polished surface.

hope that helps

Mick
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1bantamcloser2divorce

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PostSubject: Re: Crank case transfer port question   Fri Mar 30, 2012 7:39 am

Mick,

Yes, that is helpful, Thanks!
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john bass

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PostSubject: Where...?   Fri Mar 30, 2012 10:58 pm

Where do Bantams race in Vancouver? -- or even in Canada?

John-Boy -- nul-nul, Seven-&-a-Half -- citizen of Canada, UK & Deutschland ‹beralles!!!
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andy338



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Registration date : 2012-03-11

PostSubject: Re: Crank case transfer port question   Sat Mar 31, 2012 7:46 am

I am building a Bantam racer to race here in the states. I am planning on racing it in the 200gp class with AHRMA. I currently run a C15 in that class and previously I raced a Triumph Cub. I am building a 125 and a 175 engine.

Andy- not the same one from the original post
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1bantamcloser2divorce

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Number of posts : 36
Localisation : Vancouver Island, CANADA
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PostSubject: Re: Crank case transfer port question   Sat Mar 31, 2012 2:03 pm

john bass wrote:
Where do Bantams race in Vancouver? -- or even in Canada?

John-Boy -- nul-nul, Seven-&-a-Half -- citizen of Canada, UK & Deutschland ‹beralles!!!

Well really I am just building a Bantam with a race motor in it. I thought it would be an interesting and relatively inexpensive project. I almost have all the parts after a lot of ebay, auto jumble and craigslist purchases. So I am excited to get going with the build!
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john bass

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PostSubject: Thanks!   Sat Mar 31, 2012 9:00 pm

Thanks young man! I just thought perhaps you would start a Bantam Racing Club in Vancouver. I was ten years in Montreal and it was snowmobile or car racing there with no sign of MC racing.

Cheers!
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