Opinions Wanted Please

Plastic bits and Paint

Which Feed?

Side
8
80%
Nose
2
20%
 
Total votes: 10

Luders
Avgas Sniffer
Posts: 3926
Joined: Fri Jun 18, 2010 11:29 am
Location: Oxfordshire

Opinions Wanted Please

Post by Luders »

So most of you will know bought some TZ bodywork some time ago for my latest project.

Now I want to develop a pressuirised airbox with this bike, but the fairing has two feed options for me.

What I want to know is, which one should I use?

I am leaning towards blanking the one in the nose off and routing the one from the side.

Here are the pictures, just let me know what you think.

Cheers, Ben

Image

Image

Image
User avatar
scooble
Premix Junkie
Posts: 1549
Joined: Thu Jul 27, 2006 12:47 pm
Location: West Sussex
Contact:

Post by scooble »

Side would probably be easier as routing through the hedstock can be a problem, although, the side may be more prone to damage though if you drop it
User avatar
JanBros
Avgas Sniffer
Posts: 3306
Joined: Wed Jul 26, 2006 11:50 pm
Location: the land of Francorchamps

Post by JanBros »

my humble opinion -not that you'll listen :mrgreen: : don't waste time and energy on presurised airboxes, they are not worth the effort.

only above 200km/h they start to give measurable advantage, and how many times per lap do you run those speeds on a non-prodie 250 :?: :-k

on the downside : you add more weight, make the bike a lot more complicated, more possible problems (with the need to preasure the float bowls), a lot harder to work on, especially when jetting and make it more difficult to find the correct jetting.

I would just make an as big as possible airbox and make sure it gets cold air.
My ultimate goal is to die young as late as possible !
Luders
Avgas Sniffer
Posts: 3926
Joined: Fri Jun 18, 2010 11:29 am
Location: Oxfordshire

Post by Luders »

I appreciate what you''re saying and might take your advice Jan. I am still wanting to run a cool front air feed to the carbs though.
KR-1R
Premix Junkie
Posts: 1587
Joined: Wed May 16, 2007 2:24 am

Post by KR-1R »

.
.
ducting airflow from the backside of your radiator is probably more a concern

if you were starting from scratch youd put a hole through the frame from the side one

the top one isnt really a good shape for catching air from the point of the fairing - but would be easiest to get a duct into the front of your dummy tank and to the top of the airbox - but your steering damper is on that side (currently) - however a single scoop asymetric design might have jetting consequences banked over left or right (high speed)

my previous thoughts were - single heads (due to thermostat) and two radiators (vertical V) with a central duct above the mudguard straight between the cylinders into the airbox
User avatar
ScottaKR
Premix Junkie
Posts: 1521
Joined: Fri Aug 10, 2007 2:52 pm
Location: Australia

Post by ScottaKR »

I'm with KR-1R on this one so far. I wouldn't bother with the pressurised airbox personally, but I do like the idea of a cold air feed.
Aesthetically speaking, I prefer the side duct though. Perhaps if you put a nice large and smooth radius on the left side of the opening of the top feed (looking from the front), it would be more effective at picking up air.
KR250 Tandem Twin (Naked) :mrgreen:
KR1 Red/White
KR1S Track Bike (has been put on hold for now)
ZXR750 H1 (Winter project)
Luders
Avgas Sniffer
Posts: 3926
Joined: Fri Jun 18, 2010 11:29 am
Location: Oxfordshire

Post by Luders »

KR-1R wrote:if you were starting from scratch youd put a hole through the frame from the side one
That's the thing Danny, I am starting from scratch and that is exactly what I was thinking.

This is why I brought this subject up now, because I need to get any and all the fabrication work on the frame done first :)
maccas
Oil Injector
Posts: 872
Joined: Mon Sep 07, 2009 8:33 pm
Location: east yorkshire

Post by maccas »

I'm going to throw a spanner in the works here ben and suggest that you will get the highest static airbox pressure by designing a duct that takes its supply from smack bang in the middle of the top fairing. This would also give the most 'still' air too.

This might not be possible though with your frame/rad set-up.

There are some very in detailed threads on the rgv forum discussing pressurised airboxes. I believe they are the way to go and i would like to design one for the 3xv one day too

Dan
Luders
Avgas Sniffer
Posts: 3926
Joined: Fri Jun 18, 2010 11:29 am
Location: Oxfordshire

Post by Luders »

Do you have a link to the thread? I have an RGV forum account.

I also didn't fancy going through the head stock.
maccas
Oil Injector
Posts: 872
Joined: Mon Sep 07, 2009 8:33 pm
Location: east yorkshire

Post by maccas »

This one has alot of info in:

http://www.rgv250.co.uk/forums/index.ph ... msearch__1

Also check out barry b's building f250 thread in the f250 section.

Dan
Luders
Avgas Sniffer
Posts: 3926
Joined: Fri Jun 18, 2010 11:29 am
Location: Oxfordshire

Post by Luders »

Thanks Dan
Luders
Avgas Sniffer
Posts: 3926
Joined: Fri Jun 18, 2010 11:29 am
Location: Oxfordshire

Post by Luders »

Having read all that, I will not be making a fully pressurised airbox on this bike.

I do still intend on using the side feed to route cool air into the airbox though.
User avatar
si.likes.guiness
Heavy Smoker
Posts: 197
Joined: Sat May 24, 2008 7:49 pm
Location: chesterfield

Post by si.likes.guiness »

you could make an air tray like my old h***a rs 125 had and my nsr has mate
ive seen more tarts than mr kipling
Luders
Avgas Sniffer
Posts: 3926
Joined: Fri Jun 18, 2010 11:29 am
Location: Oxfordshire

Post by Luders »

Post some pics please Si
User avatar
si.likes.guiness
Heavy Smoker
Posts: 197
Joined: Sat May 24, 2008 7:49 pm
Location: chesterfield

Post by si.likes.guiness »

sorry its a bit late,i wasnt near a computer yesterday mate,this is mine Image Image Image
ive seen more tarts than mr kipling
Post Reply