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26-03-09, 05:46 PM
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#41 |
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Re: I personally...
Oh come on... theres got to be mileage in the wooden airbox idea. Can you make a plane out of cheesium?
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26-03-09, 10:37 PM
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#42 | |
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Re: I personally...
Quote:
 So it'll be rubber. Might manage to Increase height by a mere 10mm. Guess that will help, might be enough.Ive got another air box (£19) so im going to look at putting holes into the top of the airbox to allow more air in there, it'll still go into the filter so happy days. Ill lose ram air effect but tbh I dont spend enough time about 120mph for that to matter  Cheers |
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27-03-09, 12:44 AM
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#43 | |
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Re: I personally...
Quote:
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27-03-09, 01:22 AM
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#44 | |
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Re: I personally...
Quote:
Will be 
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27-03-09, 12:31 PM
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#45 |
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Noisy Git
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Join Date: Apr 2007
Location: Halifax/Leeds
Posts: 26,645
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Re: I personally...
Chop it, use some waxed cardboard to hold it, then use fibreglass to make it permanent.
P.s with airbox volume you're not really removing a choke point you're changing resonance characteristics. If you're going to drill it then you might as well just remove the top of the airbox entirely.
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Now rebuilding a 63' fishing trawler as a dive boat |
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27-03-09, 03:21 PM
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#46 | |
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Re: I personally...
Quote:
Even a small hole like maybe an inch? Problem is (you might be able to set me straight) is that its only got a 7L air box... I think the general rule is 10x engine capacity, which means the Rotax engines suffer from a slight lack of air box pressure, If I added a Litre (or more capacity) and dont put any holes in will I get any gains? will resonance be left in tact and the extra pressure help the engine breath better? More pressure because you take a litre out of 7 and you are left with 6/7 of the air, take 1 litre out of a 8 litre box you have 7/8 of the air in the space so higher pressure. If you can set me straight then ace-icles
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27-03-09, 03:29 PM
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#47 |
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Noisy Git
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Join Date: Apr 2007
Location: Halifax/Leeds
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Re: I personally...
It's hard to say, and I don't think this laptop will handle floworks!
However, cutting a hole will certainly affect the flow, I would take a flying guess that under the tank is below atmospheric pressure at speed, meaning you would lose power at speed. As well as the near total loss of ram air gains. What about some rubber flappers over the holes? Best of both worlds perhaps.
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Currently Ex Biker
Now rebuilding a 63' fishing trawler as a dive boat |
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27-03-09, 03:38 PM
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#48 | |
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Re: I personally...
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You mean have holes and have a weak spring valve that allows more flow at high RPM, When the air is being pulled through the hardest? I have thought about this, Would that work? Would that help? |
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27-03-09, 03:39 PM
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#49 |
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Noisy Git
Mega Poster
Join Date: Apr 2007
Location: Halifax/Leeds
Posts: 26,645
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Re: I personally...
Dunno. You know about computers, get a pair of pressure transducers and find out
 Instinct says yes it will help. Logic doesn't say how much by!
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Currently Ex Biker
Now rebuilding a 63' fishing trawler as a dive boat |
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27-03-09, 03:41 PM
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#50 | |
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Re: I personally...
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Then I need a Exup valve and im sorted ha ha, best of both worlds, and lots of complex things... I got another air box on its way like I said (I think) so I can have a play with variable airflow. Should be interesting work 
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