bitsilly
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| posted on 16/6/08 at 06:45 PM |
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Can anyone help with breathing/airbox/tune?
I have an R1 carb engine in an MNR which I think needs a tune. When getting it tuned I figured I should perhaps get an airbox first?
The sponge air filter currently fitted was squashed by the bonnet, so I cut 4 holes in the bonnet directly above the intakes, I do not know if this is
a very good solution as it may well be a low pressure area at speed.
Am I right in thinking an airbox gets its air through a flexible duct? If so is there a good high pressure place to put the intake?
And does the filter go over the mouth of the duct? If so, as its surface area is smaller than the sausage filter, is it a restriction?
Finally, is there a rolling road bike engine tuner in south Wales anyone could recommend?
Sorry for going on and thanks for any feedback.
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mad-butcher
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| posted on 17/6/08 at 08:50 AM |
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don't for gods sake run it with no filter, the slant eyed gets are good but not that good,you'll be running it that weak it will be
melting piston crowns,can you post a pic of the engine with the filter fitted then maybe we can advise you the best way to go it's difficult
without knowing what you're dealing with.
Tony
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bitsilly
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| posted on 17/6/08 at 08:56 AM |
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Cheers Tony,
I may get back to you on that, but TimC has recommended two tuners so I may be able to source the lot from them in case they have a preferred set up
before tuning.
Ed
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mad-butcher
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| posted on 17/6/08 at 09:20 AM |
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as i said depends on what it's been jetted to run on, if it eas jetted for a foam filter and you fit the original air box it will run to
weak/rich depending on what was done, If it's had a dyno jet kit fitted then as far as I am aware it cannot be reversed as you have I believe to
drill some jets out and araldite some up.
just in case you're interested I've put several genuine yam w/shop manuals at http://mkfireblade924.spaces.live.com in the
w/shop manuals in the public folders
Tony
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bitsilly
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| posted on 17/6/08 at 12:06 PM |
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Spoke to PDQ who said to fit the filter etc that I want and they will optimise the set up.
This is what I meant by airbox, but they said to avoid a ram-air effect or it may cause lean burn.
http://www.balancemotorsport.co.uk/products.asp?recnumber=106182
The only reason to fit it is to reduce noise,.
To avoid ram effect I could just have the intake open and facing the rear of the car, or face it forward and pipe the inlet to somewhere cool.
I cannot see how where the filter goes, on the end of the pipe or inside the box!
Is this set up know or am I about to be stupid!!
Cheers
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Guinness
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| posted on 17/6/08 at 12:14 PM |
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The airbox that you have linked to is the Pipercross PX600. I have one fitted to my car.
There is an integral cone filter just inside the mouth of the air intake, this is available in either 75mm or 100mm diameters.
HTH
Mike
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bitsilly
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| posted on 17/6/08 at 04:20 PM |
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Cheers for that, I have picked up along the way that I need to plumb the float bulb in-pipes into the same box to keep the fuel pressure matched to
the air pressure and so avoid lean mixture, also that the feed pipe should be as short and as straight as poss and end ideally in a naca duct.
All from Andy Bates at AB Performance who pulled in in his car on his mobile and spoke to me for about half an hour, top bloke! I hope to now get him
to fit his own air box set up, I'll keep you posted if anyone is interested.
Cheers all
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JoaoCaldeira
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| posted on 19/6/08 at 11:17 AM |
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I'm interested in finding out how things went.
I don't think that the RAM effect is a bad thing in an injected engine (with a PC III or similar) as the lean condition would be overrided by a
new map... meaning more air + more gas = more power 
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mkindy95
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| posted on 19/6/08 at 12:36 PM |
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Andy @ AB Performance
Can I second the comments about Andy @ AB Performance, this guy is very very helpful, he has just done a little job for me, which I assume cost more
in the phone call to discuss etc than he has charged me. Top guy who is happy to help.
I will be using AB Performance again in the future.
Thanks Andy
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