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Old 05-16-2013, 01:25 PM   #14461
shanekfalcon
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Opening up filter opening

Hi guys,

Next time I take the tanks off - which won't be for a long time, I'm thinking about opeing up the air filter from the circle to the full triangle and just wanted to check that this is a good idea. I've got a Laser competition Produro ( which isn't that louad at all really ) and 135 main jets. Robmoto put the jets on and mounted the Laser for me; which I reallty appreciate.

My understanding is that if I open up the filter and either file smooth the edge, or coat it in silicon to ensure smooth air flow I should be able to get more air through AOK and eek even slightly more power out of the it. The bike is a 1990 800S / SR42 and great fun to ride. Running Mitas E07 tyre on the rear and will switch to E07 on the front when the trailwing wears out.

Thanks,

Shane
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Old 05-16-2013, 04:31 PM   #14462
Simosez
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yeah Shane, i ran a bead of silastic around mine and it seams to work fine.
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Old 05-17-2013, 05:21 AM   #14463
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Quote:
Originally Posted by shanekfalcon View Post
Hi guys,

Next time I take the tanks off - which won't be for a long time, I'm thinking about opeing up the air filter from the circle to the full triangle and just wanted to check that this is a good idea. I've got a Laser competition Produro ( which isn't that louad at all really ) and 135 main jets. Robmoto put the jets on and mounted the Laser for me; which I reallty appreciate.

My understanding is that if I open up the filter and either file smooth the edge, or coat it in silicon to ensure smooth air flow I should be able to get more air through AOK and eek even slightly more power out of the it. The bike is a 1990 800S / SR42 and great fun to ride. Running Mitas E07 tyre on the rear and will switch to E07 on the front when the trailwing wears out.

Thanks,

Shane
Gidday Shane, Glad to here the bike is still a goer, the main jets I fitted to your bike are 125 mains , standard for the SR/42 are 117.5 so a substantle increase.
As for cutting the side of the air cleaner is does help it breath , but bare in mind that at higher speeds say 130 pluss you can sometimes get some turbulence at the intake especially with cross winds .
AS for going up through the gears and up to the normal riding speeds its good.
some foam contacted to the side cover would help in front of the opening or similiar like Ray tried a bit of plastic from a bottle to cause a vacume to the opening.
Another thing that is worth a try Shane would be to drill some holes in front of the snorkel but leave the snorkle in and try, maybe the best of both worlds.
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Old 05-17-2013, 05:27 AM   #14464
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Originally Posted by Simosez View Post
yeah Shane, i ran a bead of silastic around mine and it seams to work fine.
Simon , re orange bike, I cut out to the triangle shape and did the top of the air box mod that I posted ages back and pumpers and don,t have any fluffy up top performance issues at top range high speed .
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Old 05-17-2013, 05:45 AM   #14465
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Old 05-17-2013, 05:55 AM   #14466
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Old 05-17-2013, 05:56 AM   #14467
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Old 05-17-2013, 05:58 AM   #14468
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Old 05-17-2013, 06:00 AM   #14469
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Old 05-17-2013, 06:02 AM   #14470
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Old 05-17-2013, 06:17 AM   #14471
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The last pic is a pre cleaner fairly open foam like the main barrel element.
The size is O/A dia 115 , 90mm intake, length 150, or 140 sorry forgot ,
The air can go over the filter and under the filter in the air box, the pre cleaner is so the main element does not have to come out all the time for cleaning because although I have not tried yet but it looks like the left tank may have to be jiggled out at the bottom for the main element removal.
I took the bike to 140 in 4th and up to 150 in 5th and road around a bit and everything was fine so far, I will soon make a extended cover for it when I have got the time .
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Old 05-17-2013, 06:22 AM   #14472
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and its for this bike,
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Old 05-17-2013, 08:40 AM   #14473
Ladder106
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Thumb I like it !

Outstanding Rob,

I understand the concept of the ally plate taking the place of the left airbox side.

But I don't see how you attached the foamy filter to the plate. Is there a lip welded to the plate and the filter clamped to that?

A few more photos for the conceptually challenged (me) would be appreciated. Can you remember what UNI part #s you used?

This is maybe better than my plumbing adapter idea (which I have not yet tried out)..
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Old 05-17-2013, 11:44 AM   #14474
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With more study I find that you used 2 ally plates but still don't quite see how you sealed the filter between the two.

Apologies for being dense.
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Old 05-17-2013, 04:14 PM   #14475
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Ray, I will try to explain, ,
The airbox is cut just slightly at the bottom right and so if somebody don,t like it they can go back to original paper job .
The white looking piece is a bit of cutting board plastic, now this has to be the exact thickness of the first poly rubber caseing flange so to make it all flush or level, it can be say half a millimetre more proud if no thin foam is on the back of the outside ally cover so when the ally plate goes on it lay,s across the two surfaces, to seel it.
I cut the hole in the plastic board nice and neat and is a good fit to help seel and the filter from vibrating .
What stops the filter from falling inside the box is the filters own lip on the flange against the original box, and the bottom of the filter itself rests on the rise of the air filter box where it risers up for the shocky.
The sock part goes inside and is flush on the out side , now inside of the the flange there is a 4 to 5mm larger lip and the foam is pressed out in this lip at the entrance with a stainless piece of , I used a large radiator type clamp and cut the section where the screw bit is, off , making it like a large sir clip.
I used sikoflex seeler between the white board and air box before doing up the 3 screws a thick bead was needed along the top.
The MAIN objective of all this work was to equall or better slightly the air flow to the BST 33 or like what is on my bench at the moment BST 34 carbs that I got for nuffan .
Here are some more pic,s , and don,t worry I did clean it all properly before installation.
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