kurt
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| posted on 22/2/06 at 09:15 PM |
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R1 Carb trumpets, do I need them?
I've just been reading the thread about R1 airboxes and sock filters and somebody mentioned the fact that the intake trumpets have a significant
effect on the performane of an engine. The carbs I've got have no trumpets at all! It sounds like I need some. Does anyone know where I can
get some? (I've tried a dealers, no joy, they come as part of the carbs) Do race teams remove them at all? Are they likely to want to sell them
on? I'm using the standard airbox reversed and plan to get a K&N filter. Any thoughts?
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Jon Ison
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| posted on 22/2/06 at 09:44 PM |
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You do need them for optimum performance, they increase and smooth airflow thru the carbs, as too getting a set ebay ? breakers ?
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kurt
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| posted on 22/2/06 at 09:52 PM |
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Just seen some on ebay, so bidding now.
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big_wasa
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| posted on 22/2/06 at 09:53 PM |
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I also need them  I have been trying to find a set for months and the conclusion I have come to is that either I machine some out of alloy OR I buy
another set of carbs just for the trumpets and re-sell them
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ChrisGamlin
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| posted on 23/2/06 at 10:18 AM |
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I believe Richard Miles had some machined up for his Striker build as he wanted shorter ones than standard to fit under a sausage filter better. Might
be worth hunting through his website here to see if he mentions them.
Chris
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Coose
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| posted on 23/2/06 at 11:26 AM |
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Rich had the aluminium trumpets machined back flush (but keeping the same radius as existing) after taking advice from Ray Stringer.
For those who don't know, Ray is an ex-BSB racer and a top-class bike tuner! 
Spin 'er off Well...
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smart51
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| posted on 23/2/06 at 12:51 PM |
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I just have the bosses without the trumpets under a foam filter. How much improvement is gained from turning the bosses down and radiusing the edge?
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Coose
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| posted on 23/2/06 at 01:33 PM |
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I dunno to be honest! I have the same setup (with a TTS carb kit, Pipercross filter and a chimberley to the same dimensions as Rich Miles' ) and
it goes like stink and carburates beautifully! It may make a difference, but as I'm not bothered about scraping up the last horsepower the old
addage applies - 'if it ain't broke....'
Though, I've almost got all of the bits gathered up to fir my Keihin FCR41 flatslides.....  
[Edited on 23/2/06 by Coose]
Spin 'er off Well...
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muzchap
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| posted on 23/2/06 at 05:12 PM |
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OK boys
These are what you want to use! :-)
now how much do ya love me :-)
Im going for the AH34's (I think I have the room and individual airsocks) - now if someone has a cheap airsock site
CLICK ME CLICK ME CLICK ME
and a piccy
Cheers,
MuzChap
[Edited on 23/2/06 by muzchap]
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If you believe you're not crazy, whilst everybody is telling you, you are - then they are definitely wrong!
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progers
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| posted on 24/2/06 at 09:08 AM |
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Turning down bell mouths
On my carb'd Indy, I had the ally bellmouths turned down in a similar fashion to what Rich Miles did on his R1. I would say that it does improve
top end bhp (2-3bhp) but at the expense of some low/mid range flexibility.
So this is an ideal mod for a trackday/racer or bike person but not necessarily one I would do for a road BEC. I think QB Carbon do some carbon
bellmouths that have a similar effect - not cheap though!
Cheers
Paul
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