[webber]

Anyone out there using HD screaming eagle Car,are they worth the money?
My stock one is OK but getting itchy for little more .Have gb13ba motor,hurricane headers

Any info would be nice cheers

[webber]

Carb I meant

[webber]

Carb I meant

[just_cruizin]

Why use a 1940's design bike carb for a bike on a 1980's design jap 4x4. Sierra carbs are well suited to Sierra engines

[JrZook]

just_cruizin wrote:

Why use a 1940's design bike carb for a bike on a 1980's design jap 4x4. Sierra carbs are well suited to Sierra engines

This is not an Amel or Bing primitive 1940's type carb

It's a fairly late model design Mikuni CV type side-draft carb. IMO one of the better designed carbs for economy, throttle response and high angle use.

[sideways]

JrZook wrote:

just_cruizin wrote:

Why use a 1940's design bike carb for a bike on a 1980's design jap 4x4. Sierra carbs are well suited to Sierra engines

This is not an Amel or Bing primitive 1940's type carb

It's a fairly late model design Mikuni CV type side-draft carb. IMO one of the better designed carbs for economy, throttle response and high angle use.

x2 and it is a single carb.

[KEENSY85]

they use them in they states , personaly i would rather twin Su webers or gsxr throttle bodys if i was rich not saying u are

[Samurai81]

A mate of mine has one fitted to the 1600 in his winch comp Samurai. His is a top competition truck and he finds it a huge improvement on the FI he used to use. Even with his sponsorship deals it cost him over $3000 to fit it himself (he's a mechanic). Ya really got to want one and have truckloads of spare cash.

[webber]

Dosent look like anyone is using one in oz,might just stick to the
Old stock one

[Shansh]

im keeping my eye out for a gixxer or similar carb setup

[JrZook]

webber wrote:

Its a recommended piece for a little bit more out of a 1.3
If you have little cash to spend think it would be a nice addition
To a small motor.

I have no doubt that it would drastically improve the output of the lil 1.3.

[atari4x4]

KEENSY85 wrote:

they use them in they states , personaly i would rather twin Su webers or gsxr throttle bodys if i was rich not saying u are

[KEENSY85]

atari4x4 wrote:

KEENSY85 wrote:

they use them in they states , personaly i would rather twin Su webers or gsxr throttle bodys if i was rich not saying u are

this guy ^^^^^^^^^^^^^^^^^^^^^

[twitchy]

Shansh wrote:

im keeping my eye out for a gixxer or similar carb setup

Make sure when you get bike carbs they off nothing bigger than a 600!!!!!!!!!!


BUT the true funny here is WEBBER talking about a carby

[Shansh]

twitchy wrote:

Shansh wrote:

im keeping my eye out for a gixxer or similar carb setup

Make sure when you get bike carbs they off nothing bigger than a 600!!!!!!!!!!

thanks mate, but why is that? would have thought around a 1000-1100 would be more suitable? i know SFA about bike carb conversions on a sierra and havent researched a great deal yet so im not clued up yet

[Santos]

Shansh wrote:

twitchy wrote:

Shansh wrote:

im keeping my eye out for a gixxer or similar carb setup

Make sure when you get bike carbs they off nothing bigger than a 600!!!!!!!!!!

thanks mate, but why is that? would have thought around a 1000-1100 would be more suitable? i know SFA about bike carb conversions on a sierra and havent researched a great deal yet so im not clued up yet

Motorcycles have REALLY high redlines, especially the sports bikes. so a 600cc at 13000rpm is in theory displacing as much fuel/air as a 1200cc at 6500pm..

so the big jets are probably going to be rich on a bigger bike.. you will still be stuffing around getting it opened it up at the low end for the car engine.

(At least i think thats what twitchy is getting out)

Also the smaller bikes generally have smaller throttlebodies. Each intake hole is approx 29-33mm diametre (measured them once) so massive 40mm+ ones are pretty pointless, getting something closer to the stock intake makes more sense tuning

Quad-carbs... one day.

[Santos]

i forgot to add that anyone SERIOUSLY attempting a bike quad-throttle body should probably forget the CV (constant velocity/vacuum) ones altogether and get some fixed jet butterfly carbs off early 600-900cc 4 pot motorbikes from the 70's and 80's. Generally they are smaller, would be much easier to 'retrofit', and get their head around (think f10a carb)
You should still be able to achieve good results in throttle response, fuel economy and power gains etc with the 'individual runner' set up. i think the reason why the solex/side draft webbers are not used in sucessful numbers on the 800/1000/1300/1600 carb enines... they are just to big

[Shansh]

makes sense, cheers guys will keep my eyes open

[twitchy]

Santos wrote:

Shansh wrote:

twitchy wrote:

Shansh wrote:

im keeping my eye out for a gixxer or similar carb setup

Make sure when you get bike carbs they off nothing bigger than a 600!!!!!!!!!!

thanks mate, but why is that? would have thought around a 1000-1100 would be more suitable? i know SFA about bike carb conversions on a sierra and havent researched a great deal yet so im not clued up yet

Motorcycles have REALLY high redlines, especially the sports bikes. so a 600cc at 13000rpm is in theory displacing as much fuel/air as a 1200cc at 6500pm..

so the big jets are probably going to be rich on a bigger bike.. you will still be stuffing around getting it opened it up at the low end for the car engine.

(At least i think thats what twitchy is getting out)

Also the smaller bikes generally have smaller throttlebodies. Each intake hole is approx 29-33mm diametre (measured them once) so massive 40mm+ ones are pretty pointless, getting something closer to the stock intake makes more sense tuning

Quad-carbs... one day.

Yep that's what I was talking about, One of the blokes I rode dirt bikes with was a brilliant bike mechanic & when I was going to build the Frankenrolla a while ago he told me not to use big bike carbies as they will just dfrown a car engine ( for the above reasons 13000rpm can use it, 6500 can't) BUt done properly it will sound awesome, go great & give you a fat a cat can't scratch!!!!

[webber]

Why is Harley Carb on a Suzuki motor funny?The one on you tube looks OK

[twitchy]

Dude, YOUR name is "Webber" & you were talking about a carby............. just found it funny, but I'm strange.

[JrZook]

Santos wrote:

i forgot to add that anyone SERIOUSLY attempting a bike quad-throttle body should probably forget the CV (constant velocity/vacuum) ones altogether and get some fixed jet butterfly carbs off early 600-900cc 4 pot motorbikes from the 70's and 80's.

The CV style makes them totally worth the effort! Throttle response is smooth and the fuel is actually metered pretty darn well compared to conventional butterfly carbs.

Any CV type quad carb set from ~28-36mm throat size will offer a great improvement over the stock downdraft.

[webber]

Nice info jrzook cheers mate

[Rhinoman]

Over here a single 44mm SU is a common conversion, its a fair bit bigger (cross-sectional area) than the stock carb and gives it a good boost as well as being good on fuel. I don't doubt that a well set up 44mm Mikuni would work very well, the stock EFi works out smaller so you won't get the same power from it.

[Santos]

JrZook wrote:

Santos wrote:

i forgot to add that anyone SERIOUSLY attempting a bike quad-throttle body should probably forget the CV (constant velocity/vacuum) ones altogether and get some fixed jet butterfly carbs off early 600-900cc 4 pot motorbikes from the 70's and 80's.

The CV style makes them totally worth the effort! Throttle response is smooth and the fuel is actually metered pretty darn well compared to conventional butterfly carbs.

Any CV type quad carb set from ~28-36mm throat size will offer a great improvement over the stock downdraft.

Yeah but setting up needles etc would be a nightmare and i think thats why so many people start than abandon the idea... if you get it done on fixed jet you got a set up that can convert it to CV if you think its going to be worth the effort.

Can't rember which one but in one of david vizard books he talks about putting 6 carbs on a straight six toyota truck. From memory he said the throttle response was uncomparable to any other carb set up

[JrZook]

Santos wrote:

JrZook wrote:

Santos wrote:

i forgot to add that anyone SERIOUSLY attempting a bike quad-throttle body should probably forget the CV (constant velocity/vacuum) ones altogether and get some fixed jet butterfly carbs off early 600-900cc 4 pot motorbikes from the 70's and 80's.

The CV style makes them totally worth the effort! Throttle response is smooth and the fuel is actually metered pretty darn well compared to conventional butterfly carbs.

Any CV type quad carb set from ~28-36mm throat size will offer a great improvement over the stock downdraft.

Yeah but setting up needles etc would be a nightmare and i think thats why so many people start than abandon the idea... if you get it done on fixed jet you got a set up that can convert it to CV if you think its going to be worth the effort.

Can't rember which one but in one of david vizard books he talks about putting 6 carbs on a straight six toyota truck. From memory he said the throttle response was uncomparable to any other carb set up

Have you ever had a crack of setting up a CV type or SU carb? The needle gives you so much more flexibility in tuning than a fixed jet carb. It's also not as hard as you think to setup. Think of it as another fuelling circuit for midrange throttle compared to having to try and balance out the idle jet, emulsion tubes and main jet to get a descent midrange on a fixed jet carb.

[KEENSY85]

JrZook wrote:

Santos wrote:

JrZook wrote:

Santos wrote:

i forgot to add that anyone SERIOUSLY attempting a bike quad-throttle body should probably forget the CV (constant velocity/vacuum) ones altogether and get some fixed jet butterfly carbs off early 600-900cc 4 pot motorbikes from the 70's and 80's.

The CV style makes them totally worth the effort! Throttle response is smooth and the fuel is actually metered pretty darn well compared to conventional butterfly carbs.

Any CV type quad carb set from ~28-36mm throat size will offer a great improvement over the stock downdraft.

Yeah but setting up needles etc would be a nightmare and i think thats why so many people start than abandon the idea... if you get it done on fixed jet you got a set up that can convert it to CV if you think its going to be worth the effort.

Can't rember which one but in one of david vizard books he talks about putting 6 carbs on a straight six toyota truck. From memory he said the throttle response was uncomparable to any other carb set up

Have you ever had a crack of setting up a CV type or SU carb? The needle gives you so much more flexibility in tuning than a fixed jet carb. It's also not as hard as you think to setup. Think of it as another fuelling circuit for midrange throttle compared to having to try and balance out the idle jet, emulsion tubes and main jet to get a descent midrange on a fixed jet carb.

I'm not that good myself but it can be done,others have set it up and the power has been unbelievable . And SU webber carbs are used so often small engines so much it's not funny.

[atari4x4]

KEENSY85, FYI SU's & webers are 2 different manufactures of carbys

weber sidedraught DCOE


SU carby


they are 2 very different kettles of fish & a webber is something you BBQ a chook in

[fire60]

one thing about the Harley carbs is that they are diaphram rather than bowl type... like a chainsaw this means that they can operate in any angle,

[Rhinoman]

fire60 wrote:

one thing about the Harley carbs is that they are diaphram rather than bowl type... like a chainsaw this means that they can operate in any angle,

All the bike carbs that I have seen have had a float bowl but they are designed for high angles of lean - except on a Harley!