Custom made intake trumpets for Donsy - MVAgusta.net
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post #1 of 175 (permalink) Old 03-15-2012, 03:58 PM Thread Starter
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Custom made intake trumpets for Donsy

Recently Donsy set me a challenge (should I choose to accept it!) of making him some 'extended' intake trumpets.
Initially we had considered machining the OEM trumpets and adding 'extention' sections.
Mark from 'Time machine bikes' kindly sent me a set of OEM trumpets as samples to work from..measurements etc, and I'm indebted to him for this. On close inspection of the OEM trumpets and the material they were made from I opted to 'rise to the challenge' and completely custom make Donsy new ones from Ally to his specifications ...he wanted them 18mm taller than OEM with the ring of eight 3mm holes a further 9mm up the trumpet 'tube'. Also the trumpets were to have the correct 3 degree taper on their inside diameter from top to bottom.
At the time of writing this The Trumpets are currently on their way over to Donsy...so he hasn't seen them yet. So without 'much further a do'..here are some photos of the process and a couple of them 'test fitted' on my bike to ensure all was as it should be. Think my wee lathe needs a rest now.....untill at least tomorrow! Cheers Brian
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Last edited by BG Wells; 03-15-2012 at 04:07 PM.
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post #2 of 175 (permalink) Old 03-15-2012, 04:45 PM
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Hell of lot of wasted metal there!!!! No wonder milled parts are more than cast...

But seriously, nice job. Looks beautiful...but now for the performance test

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post #3 of 175 (permalink) Old 03-15-2012, 04:57 PM
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Originally Posted by BG Wells View Post
Recently Donsy set me a challenge (should I choose to accept it!) of making him some 'extended' intake trumpets.
Excellent work again Brian, will be interesting to see the performance difference.
I see you drilled 8 holes - not 9

What did you use for the flared section ?

You now need to start work on a TSS system........

Cheers
Adam

Last edited by merc07; 03-15-2012 at 05:46 PM.
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post #4 of 175 (permalink) Old 03-15-2012, 05:31 PM
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Great work Brian, they look sensational.

Donsy will have to be at the front of the pack now.

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post #5 of 175 (permalink) Old 03-15-2012, 05:58 PM Thread Starter
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Excellent work again Brian, will be interesting to see the performance difference.
I see you drilled 8 holes - not 9

What did you use for the flared section ?

You now need to start work on a TSS system........

Cheers
Adam
Ha Ha.. Yes Adam 8 it had to be!!! (and the OEM ones have 8)
Yeah the flared section....I just ground a lathe tool to the correct profile using the OEM trumpets as a 'template' so the 'new' ones would be exact.
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post #6 of 175 (permalink) Old 03-15-2012, 06:17 PM Thread Starter
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Originally Posted by esq'z me View Post
Hell of lot of wasted metal there!!!! No wonder milled parts are more than cast...

But seriously, nice job. Looks beautiful...but now for the performance test
Ed....I was knee deep in 'swarf'!!.
When you look at a solid section about 4'' long of 3'' diameter aluminium bar it's a serious amount of machining to get just one trumpet....If my wee lathe could have 'talked'...it would have asked me if I was 'Having a laugh'!!....needless to say I think it has cooled down now.
And yep!...I want to hear the performance test!!....hope Donsy gets the results he wants.
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post #7 of 175 (permalink) Old 03-15-2012, 06:37 PM
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Beautiful work Brian
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post #8 of 175 (permalink) Old 03-15-2012, 07:07 PM
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Very nice work
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post #9 of 175 (permalink) Old 03-15-2012, 07:35 PM
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Those trumpets look the business! Nice machine work, always love seeing raw chunks of metal getting turned into stuff like that.

Interesting to hear how the performance changes. The GSXR's i've had in the past had two shorter intake trumpets and two longer trumpets. Should spread the power around the rev range a bit more?

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post #10 of 175 (permalink) Old 03-15-2012, 07:41 PM
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Not much more I can say than that. Thanks you very much Brian, you are a legend, and a true gentleman.

Only problem I have now is putting those onto my bike, they will make everything else look real secondhand.

We are very much in your debt Sir.

PS. On a side note, I was at a mate/fellow racers house last Saterday and I say his Honda CBR1000 had a similiat set-up from new. So I think this is going to be a instant change for sure.

Thanks you once again Brian and Mark for your help, from a very humble feeling Dons and Crew.

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