mad dad
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| posted on 12/4/07 at 09:25 AM |
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Air Flow over carbs on blade engine
Hi, As above really, i've got a 919 blade engine and wonder if as with some car engines the more cold air over the carbs/intercooler the better
it is???? i have fitted a bonnet with a bulge which allows lots more air into the engine and wondered if this going to make any difference over the
one without any openings??? Cheers
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worX
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| posted on 12/4/07 at 09:54 AM |
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I think more cold is better for any engine as all that does is allow the opportunity for a better and denser fuel to air mix.
With the blade engine I was told that they do not perform as well with certain types of air filters and that they perform best when they are drawing
still air - this should be fine for most people as this will be achieved with a sausage filter, but not as good with sock filters???
If I was doing it again, I think I would go for the RAM air type of scoop and box that AB Performance sells, but I will definitely not be changing
anything on this one now unless something breaks!!!
hth,
cheers,
Steve.
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gingerprince
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| posted on 12/4/07 at 10:27 AM |
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If you significantly change the air supply to your carbs, then you really need to rejet your carbs to take any advantage. Going from closed bonnet to
open bonnet will effectively feed more air in, leaning out the mixture slightly. Now whilst I'd suspect this won't make a huge difference
such as to cause lean running issues, you won't see a real benefit without rejetting to give more fuel to burn.
The reason this works for cars is that modern cars are fuel injected and have air flow sensors which calculate the amount of fuel required according
to the air.
Also I'm no expert but I'd guess that there will always be some sort of compromise when having your carbs setup with air directly from the
outside. Carbs are setup to feed a set amount of fuel depending on throttle position. Obviously the faster you're going, the more air you get
so the leaner the mixture. So if you tune your carbs for high speed they won't be "perfect" for low speed, and vice versa.
Can't be a huge issue though because it is quite a common setup...........I'll shut up now 
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