i`ve not starter yet, but i will soon and i will send pics!

This is where the tricky part comes in. You will have to check out the carbs to see at what angle they must be put on the intake runners to let the floats,etc on the carbs work without problems.
Bike engines tend to be at a slight angle to the front part of the frame. So I would think the bike carbs will also have to be at an angle towards the engine. That is why I would suggest check out bikes at a scrapyard to see what the angle must be + - not to make a mess of it.

Please mail me your setup's pics. I am really tempted to do the same but with fuel injection.

I already have the intake flanges in 10mm alluminium. I just need the tubes! What do you sugest?

I would suggest to go to bike shops or bike scrapyards that carbs are still on the engine. You can then get a general idea at what angle to put them on your engine.

How are you going to make the custom intake manifold?
Use TnPShows templates?

uhmm yes i thought of that! The floats are an issue! I`m now thinking also if it clears the master cylinder!

You should be ok to have them on a slight lean if anything lean them so that the air is travelling 'downhill' into the engine.

Too much angle will f--k with the operation of the floats in the bowls though...
youll end up having to stuff around with the floats to make sure theyre holding the right amount of fuel.

Is any issue regarding the position of the carbs? what i`m trying to say is if the carbs must be in a horizontal position or if they can sit in angle?

bike carbs work, and they rule....
beeoneoneoh.wordpress.com

When they are talking about Flat Slide it is a type of carb where there is a rectangle box sitting vertically inside the cavity of the carb.
(kind like a sliding door that goes up and down)

when you pull the accelerator cable it is lifted and opens up the 'throat' of the carb letting air in and also lifting the 'needle' which unblocks a jet at the bottom which lets fuel come up and mix with the air.

There is also 'smooth bore' and round type and also semi flat. All have different properties but work on same principle

In fuel injection you dont have slides you have butterfly valves that turn on a shaft the same as how car carbies work.

I think a setup from a gsxr 750 would go well in your application, just work out what hp you expect to make with your A12, then google the stats of different bikes.

They are all pretty close in power so it is ok to just stick to one manufacturer for comparisons.... ie, Suzuki GSXR 600/750/1000 you fill find the yamahas, hondas, kawasakis 600/750/1000's make about the same power for each model of the same size.

As for a computer you could probably go a microtech mt-4 or something similar but i would recommend you get a "microsquirt" they are VERY small compact fuel injection computers (about the size of a wallet) they have sh!tloads of functions, and are cheap.

You can use a microsquirt to control your ignition as well (with a couple of addons such as ignition pickup wheel & sensor etc)

Just keep in mind that the micro squirt does have limitations compared to a mega squirt or any other CAR ECU becasue they are meant for bikes.
For eg. They can only put out enough power to drive one coil, so if you want a 4 coil setup you need an extra device to power the coils.

But all in all, they are suited very well to the project your planning. Probably a bit trickier to set up at first, but a lot cheaper then anything comparable.

have a look at
http://www.microsquirt.info/

I will be using one of these for my bike EFI conversion onto A15.

Hope that helps mate!

Again, sorry Bandit_blues for hijacking your thread.

To be more precise, I am planning first before I take up this project build which will be sometime in the future when I have money as the economy is on the bad side at the moment.
My plans are as follows:
A12 engine either bored one oversize (as I already have the one oversize pistons) or go larger to do what Dodgeman did and make it 1300cc engine.
Lightened A12 flywheel.
276 (Mild street) performance cam.
GX cylinder head with a very light port job, cleanup of intake ports and polish of exhaust ports.
A14 size valves.
4-2-1 GX extractor also polished as far as possible on the inside to prevent future carbon buildup.
Full balance.
Fuel injection using bike quad throttles and a computer only to handle fueling.Spark will be the normal A series stuff.

I have also leaned in the direction of a 600cc bike. Maybe 750cc then.
Now another question.What type of throttles. I read here that you get something like sliding type throttles and I can't remember the other type of throttle. Or is it the carbs that have a SU style sliding butterfly. Can someone help with this as I don't want to buy quad throttles and then see they are not the correct type.
Any info appreciated
datto12qld, it seems you are the bike expert here so maybe you can enlighten