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Back bores Mpc Tops



 
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mark61
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Joined: 28 Feb 2011
Posts: 114

PostPosted: Wed May 16, 2018 10:29 am    Post subject: Back bores Mpc Tops Reply with quote

Can you use a 25 throat mpc top on a 27 Backbore or is this a no, no. I'm not a pro ,just wanted to know with minute tolerances if this was just a no go.

Thanks
Mark
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TKSop
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Joined: 23 Feb 2014
Posts: 1363
Location: UK

PostPosted: Wed May 16, 2018 10:42 am    Post subject: Reply with quote

Can you?
-Sort of.

Will it work?
-Sometimes but the odds of success seem to be lower (presumably due to the ridge created by the mismatch rather than the throat getting smaller - remember Warburton does backbores that contract from #27 at the interface to #28/#29 further in)


If you've already got both, just try it and see...
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Tpt_Guy
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Joined: 16 Jul 2004
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Location: Sacramento, Ca

PostPosted: Wed May 16, 2018 10:48 am    Post subject: Reply with quote

If it works, use it.

But you say 27 backbore...do you mean the throat at the screw juncture, or an actual 27 backbore? There is a difference.
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mark61
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Joined: 28 Feb 2011
Posts: 114

PostPosted: Wed May 16, 2018 11:40 am    Post subject: Reply with quote

I have a Wedge top coming that's ideally for a 25 back bore..
I was going to try iron my warb 7 back bore.
Hope this makes more sense

Mark
Till I find a 25 bottom from wedge
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TKSop
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Joined: 23 Feb 2014
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PostPosted: Wed May 16, 2018 11:57 am    Post subject: Reply with quote

Might as well try it - if it doesn't work then look into a #25 throated backbore.
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lipshurt
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Joined: 24 Feb 2008
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Location: vista ca

PostPosted: Wed May 16, 2018 12:53 pm    Post subject: Reply with quote

i would say that its fine about 90 percent of the time, and there is no rhyme or reason to predicting it. Most players will be able to put a 25 throat top on a 27 throat BB, with no issues even though there is that ridge at the interface.

Other players will a get a HISSING sound.

There is very small minority like 2 in 500 players that get the hissing sound at the slightest imperceptable mismatch between top and BB. Like they just cant use screw backbores. Cured sometimes by making the BB throat one or two sizes bigger than the top throat size, but sometimes that does not even work.
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maynard-46
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PostPosted: Wed May 16, 2018 3:22 pm    Post subject: back bores mpc top Reply with quote

If the top has a smaller throat than the BB there's NO problem. Alot of players will use say a #28 throat top combined with a #27 throat BB. This eliminates ANY possibility of a ridge interfering with the sound/blow, etc. I've done this on occasion as have many other players. In fact I think Steve Patrick told me he has done that for years.

Butch
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RonWilson
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Joined: 13 May 2018
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PostPosted: Mon May 21, 2018 7:05 pm    Post subject: Reply with quote

They really need to be a good match
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mark61
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PostPosted: Wed May 23, 2018 11:41 pm    Post subject: Reply with quote

thanks alot you guys !!

Mark
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Locutus2k
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Joined: 01 Feb 2006
Posts: 506
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PostPosted: Thu May 24, 2018 1:18 am    Post subject: Re: back bores mpc top Reply with quote

maynard-46 wrote:
If the top has a smaller throat than the BB there's NO problem. Alot of players will use say a #28 throat top combined with a #27 throat BB. This eliminates ANY possibility of a ridge interfering with the sound/blow, etc. I've done this on occasion as have many other players. In fact I think Steve Patrick told me he has done that for years.

Butch


I agree. I've used to do the same with no issues.
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