RAM air box

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Paul RF
Posts: 20
Joined: Mon Jan 12, 2015 7:45 am
My Bike: Yamaha R1

RAM air box

Post by Paul RF » Tue Jun 16, 2015 5:37 am

For anyone who has experience in fitting these for a race bike I got a question for you, or maybe a few :pmsl

This is probably a stupide question but how well sealed does the air box have to be between the two halves? I can imagine it needs to be a fairly good fit, this also leads me to the fit between the lower half and the scoop. the one I have has a corner of the opening cut away, when the scoop sits in it I can see daylight through it. Will this affect how the air intake is delivered to the carbs?

Also I have bell mouths for the CV carbs, this is a one piece plastic. This goes on the carbs in place of the top plate so question is, as the top plate fitted snug in the carbs, has seals on the underside and they fit inside each throttle body flush....is the bell mouth ok just kind of partly lined up and not sitting flat on top of the carbs. Mine doesn't fit particularly well, is this normal. there would be airflow under the bell mouths across the top of all 4 carbs so it would be like it was delivered directly down each body as the shape would suggest.

I hope this makes sense....iv'e almost finished a 12 hour night shift :smt015

Also I have heard different opinions on jet size to use which seems to range from 104 to 118 which seems quite a difference to me. What's a good place to start.

What is good for sealing up the air corrector jets which won't be affected by petrol.

Any help appreciated

Paul

Deswilkie
Posts: 127
Joined: Fri May 08, 2009 2:11 pm
My Bike: ZXR400L, Trumpet 675

Re: RAM air box

Post by Deswilkie » Wed Jun 17, 2015 12:58 pm

Once the ram airbox is in situ just go round with gaffer tape to seal it where the two halfs meet.

Araldite in the air correctors is pretty standard, just don't run it for a day or so after.

Think I'm running 112.5 Kehin main's but would need to check. Every engine's different thought so the only way to really tell is get it to a dyno.

Paul RF
Posts: 20
Joined: Mon Jan 12, 2015 7:45 am
My Bike: Yamaha R1

Re: RAM air box

Post by Paul RF » Thu Jun 18, 2015 3:05 am

Ok thanks,
I have also got some draft excluder which I will use between the 2 halves and have araldite now.
Any idea on how the bell mouths should sit on the carbs, mainly the slope of the mouth down into the carb body, should it sit flush. Mine is no where near that.

Deswilkie
Posts: 127
Joined: Fri May 08, 2009 2:11 pm
My Bike: ZXR400L, Trumpet 675

Re: RAM air box

Post by Deswilkie » Fri Jun 19, 2015 1:04 pm

I attach mine (RMKD ones) with a bit of instant gasket, they fit in the circular slot around the air intake. Some bolt on replacing the standard plate which you go in place.

Paul RF
Posts: 20
Joined: Mon Jan 12, 2015 7:45 am
My Bike: Yamaha R1

Re: RAM air box

Post by Paul RF » Sat Jun 20, 2015 10:35 pm

Yeah that's fine but, just they don't fit properly, you know how the original top plate has a notch which also sits in the carb, well iv'e seen bell mouths which sit the same as that. Mine just sit too high so there's a big gap underneath.
if I could figure out how to put a picture on here I would :smt017

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CaNsA
zxr400 oc member
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Re: RAM air box

Post by CaNsA » Sun Jun 21, 2015 3:20 am

http://imgur.com

Drag and drop the image file onto the page, then click "upload"

right click on image and select "copy link url" of "copy link location"

then post the link here.
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Paul RF
Posts: 20
Joined: Mon Jan 12, 2015 7:45 am
My Bike: Yamaha R1

Re: RAM air box

Post by Paul RF » Sun Jun 21, 2015 9:29 am

Cheers Cansa,
I will give it a try
Image
see if that works.
Image
or this one

Paul RF
Posts: 20
Joined: Mon Jan 12, 2015 7:45 am
My Bike: Yamaha R1

Re: RAM air box

Post by Paul RF » Sun Jun 21, 2015 9:31 am

toad a brick it worked lol.

Now is that a bad fit or is it just me, I would imagine it's supposed to sit on that lip in the carb and drop down in that notch as well. cgeek

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zimm
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Re: RAM air box

Post by zimm » Sun Jun 21, 2015 12:51 pm

I had some like that with a ramair box i bought a few years ago ..

short silicone pipes of the right diameter bonded to the back of the plate that'll sit into the carbs like the oe bellmouths was what i came up with although i never tried it .. i sold the whole setup and resolved to get a better one later.
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Paul RF
Posts: 20
Joined: Mon Jan 12, 2015 7:45 am
My Bike: Yamaha R1

Re: RAM air box

Post by Paul RF » Sun Jun 21, 2015 2:45 pm

I had thought about cutting the ones from the original top plate and then sitting the bell mouths on top, but would rather get a bell mouth which fits correctly inside of making something which is gash and might fail.
Where did you get your proper ones from Zimm?

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zimm
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Re: RAM air box

Post by zimm » Sun Jun 21, 2015 7:01 pm

I didn't ..

I acquired some original F3 kit (air tray and bellmouths) for my H1 and have yet to get a box for my M4, but will probably try pestering RMKD when the time comes.
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