ESE's works engine tuner

[husaberg]

Wob has previously detailed some ways of modding conventional carbs to work in a downdraft situation.

The carb is a Amal MK2 concentric. the remote Float appears to be a Amal matchbox of an old Amal GP, cunning.

I seen this way today. A virtual Chocky fish to anyone under 30 years old who knows what the filthy Diesel is.

[timg]

Wob has previously detailed some ways of modding conventional carbs to work in a downdraft situation.

Link please? Ta

[Kickaha]

. A virtual Chocky fish to anyone under 30 years old who knows what the filthy Diesel is.

Fuck off, I want a real one

Dirty old Cosworth

[husaberg]

Link please? Ta

Have a look at the picture click on it twice.
Its the Quantel Norton IE the Cosworth Challange or a couple of cylinders loped of a Cosworth V8 DF something
John Surtees converted the Carbs (ex F1 car and Motorbike 500cc world champion) I guess if he is still alive he would be not so young so should be easy to find at Home.
http://www.johnsurtees.com/4394/pages/contact.aspx

Oh if you meen Wobs fix i will look,its before PG450 where he last aluded to it i have it on file i think i a Word document.
Maybe search wobbly posts
but it might be easier to ask MR Wobbly

Hindsight i think the fix was for the PJ on MX carbs and the other fix was for reverse facing carbs on the BSL but i am sure Wob will have a fix?

Fuck off, I want a real one

Dirty old Cosworth

Copy of your Birth certificate please.

[Grumph]

Wob has previously detailed some ways of modding conventional carbs to work in a downdraft situation.

The carb is a Amal MK2 concentric. the remote Float appears to be a Amal matchbox of an old Amal GP, cunning.

I seen this way today. A virtual Chocky fish to anyone under 30 years old who knows what the filthy Diesel is.

That was made to work by an Aussie by the name of Gary Flood....Surtees involvement was to offer advice and give them a couple of ex Ferrari radiators...

The first Britten used Mk2 Amals - one converted to downdraft with a right angle float chamber made up and attatched to the body - done by Alan Wylie I think. Awkward and not particularly satisfactory. Kampen in Holland is doing the same on Dellorto pumpers for Aermacchis. Most Dellortos will go to 42 deg downdraft no probs.

If you need a downdraft carb use one made for it - way less trouble.

[husaberg]

That was made to work by an Aussie by the name of Gary Flood....Surtees involvement was to offer advice and give them a couple of ex Ferrari radiators...

Correct on the Flood surtees in the bit i have read was the technical advice including carburation set up and chassis set up but why Ferrari Rads thats odd......

The first Britten used Mk2 Amals - one converted to downdraft with a right angle float chamber made up and attatched to the body - done by Alan Wylie I think. Awkward and not particularly satisfactory.

Do uou mean the Britucati or the more likely the Denco version i guess the FCR hadn't been invented then or at least hasn't on sale to the public.

If you need a downdraft carb use one made for it - way less trouble.

Yes in a ideal word way less trouble, but sometimes impossible to find.
Price up a FCR30-32-34mm on downdraft set up for a 2 stroke.
Most of the second hand ones (hens teeth btw)come in groups of fours.

So if there is a way of making the common PWK or TMX or what-ever work, It may well be worth the effort.
Nearly all the downdraft carbs available are old and made for road bikes have different more complicated metering circuits than, the race carbs and do not have the spares available (try getting a different slide cutaway for a n RGV carb for instance)
So i think it is easier to convert say an Oko to downdraft than try too get an NSR or RGV carb to work as well

Kampen in Holland is doing the same on Dellorto pumpers for Aermacchis. Most Dellortos will go to 42 deg downdraft no probs.

Yeah but, they look so wrong without the SS35 Dellotto.........

[Grumph]

Correct on the Flood surtees in the bit i have read was the technical advice including carburation set up and chassis set up but why Ferrari Rads thats odd......

Yeah but, they look so wrong without the SS35 Dellotto.........

Ex F1 oil coolers he donated which were the right size for water rads....just had them lying round....like when he wanted to build a racing Black lighning Vin, he just happened to have the bits in storage....

Don't get me started on bloody SS1's....

For downdraft carbs set up for 2 strokes, look at jetskis first. Hidden in varous catalogues too are downdrafts from Mikuni and Keihin.
They do make them, it's just a hard job finding them....

[dinamik2t]

downdrafts from Mikuni

http://www.mikuni-topham.de/ENGLISHS...R_English.html

I guess they can be searched for under the name Mikuni TMR.

[husaberg]

http://www.mikuni-topham.de/ENGLISHS...R_English.html

I guess they can be searched for under the name Mikuni TMR.

I was sceptical as i had only seen them in 39 and 41mm
but here is a 28mm one i shudder to think of the price though
NSF100 YOSHIMURA MIKUNI TMR-MJN28 CARBURETOR

One of following Yoshimura head kit.
・Yoshimura head 125cc kit
・Yoshimura head 115cc kit
Manifold kit for NSF100
Racing throttle holder set for TMR small body (NSF100/L:700mm). Layout of the throttle cable is different from STD cable.
One of following heat guard.
・Carbon carburetor heat guard sheet set
・Carbon heat guard material set
Bore Size (mm) φ28
Body Interval Single Body
SpigotDiameter(mm) 31mm
SpigotLength(mm) 24mm


GSX400 IMPULSE/GSX400S
YOSHIMURA MIKUNI TMR-MJN32 CARBURETOR (FUNNEL TYPE)
Bore Size (mm) φ32
Body Interval 77-85-77
SpigotDiameter(mm) 38mm
SpigotLength(mm) 28mm
REQUIRED PARTS

NSF100 YOSHIMURA MIKUNI TMR-MJN32 CARBURETOR (SILVER BODY)

YOSHIMURA HEAD 125cc KIT
Φ32 Insulator set/NSF100
Aluminium manifold (for NSF100)
Manifold gasket
Cap bolt M6×20SUS (2pieces)
Racing throttle holder set for TMR small body (NSF100/L:700mm). Layout of the throttle cable is different from STD cable. One of following heat guard.
・Carbon carburetor heat guard sheet set
・Carbon heat guard material set

Carburetor for the engine with Yoshimura Head 125cc Kit.
・Port machining required.
・POWER FILTER TYPE is not applicable. Bore Size (mm) φ32
Body Interval Single Body
SpigotDiameter(mm) 35mm
SpigotLength(mm) 29mm

http://shop.yoshimura-jp.com/en/prod...w_key=1&page=3

[TZ350]

Husa, in the picture of that carb there is two bellmouths, a smaller one inside the main one, how does that work? what are the benifits? does anyone know anything about them.

[husaberg]

Husa, in the picture of that carb there is two bellmouths, a smaller one inside the main one, how does that work? what are the benifits? does anyone know anything about them.

This one?

Its just an adapter isn't it? if not i have no idea.
There seems to be a lack of air entry for the pilot etc (might be over the other side)i can remember some other bell mouths that look like these old Keihins CVs? edit concentric Amal

[richban]

Husa, in the picture of that carb there is two bellmouths, a smaller one inside the main one, how does that work? what are the benifits? does anyone know anything about them.

Its a similar system to the wing splitter that you see for FCR's. Its all about trying to improve airspeed on large carbs. Small bell helps at say quarter throttle then on wide open it can come through from all angles. I looked at that when I switched to a 32 on the FXR. Turns out the 32 was fine down low.

[husaberg]

Its a similar system to the wing splitter that you see for FCR's. Its all about trying to improve airspeed on large carbs. Small bell helps at say quarter throttle then on wide open it can come through from all angles. I looked at that when I switched to a 32 on the FXR. Turns out the 32 was fine down low.

Where are you guys looking?

oh are you sure its not just a shadow, so the bellmouth is suspending in mid air ohh i am a thicko.......


DUAL STACK AIR FUNNEL SYSTEM SET its an optional part.


http://shop.yoshimura-jp.com/en/prod...ai.php?id=1385

[richban]

Where are you guys looking?

Back of the carb has 2 bellmouths.

Another version.

[dinamik2t]

Here's an exploded view :



The double bellmouth must be a Yoshi add-on.