Bike carbs,... any knowledge??

well, you can easily tell by looking at the area where the inlet manifold joins the cylinder head, (no dismantling required! ) if there are 4 separate inlet tracts then they're not siamesed (you're laughing), if there are 3 they are siamesed like an A (very awkward!) if there are two that means they are siamesed into 2 sets of two (manageable!)

But looking at that picture with the 4 bike carbs, if your cylinder head is like his, each cyl has its own port so no problem.

I'll have a look tomorrow ,..

Although this page may answer the question :

datsun1200.com/modules/nsections/index.php?op=viewarticle&artid=46


I'm probably better off with throttle bodies and an emerald ECU (Even though I don't think computers should be in cars!! ) ,...

Damn I've got a lot to learn about cylinder heads! ,.. I kind of paint in broad brushes, phat carbs, lumpy cam, good exhaust, higher compression ratio... jobs a goodun. I can see for this project I'm gonna need to actually KNOW some stuff!

I was going to go distributorless ignition,.. but I've got to read up on that... in fact I've got to read up on a lot.


In fact I don't know the first thing about injection in car engines, fuel/air mixture and jetting in weber/dell'orto I'm good with, but injection.... not the first clue.

So do you run injection into carbs, using the ECU to control the rate of fuel, instead of jetting? Or do you run it direct into the combustion chamber and just use throttle bodies to control the rate of air going into the mixture??

Can I run Bike carbs with a mappable injection system?? Will I need expensive bit of ECU kit like the Emerald box for doing mappable injection?

Dear god I have a lot to learn,.. maybe I should just stick with DCOE Webers I know where I am with them!

OK, Basic Hardware required:

Engine
Inlet manifold..... will need modifying to run bike carbs and throttle bodies.

Throttle bodies(TB): these replace carbs, and have a set of Butterflies like carbs, and angled holes in the sides, into which the injectors fit.
Along the top of the injectors runs a Fuel rail, which has a pressure regulator/damper and a feed and return line that needs to go back to the tank.
This is fed at higher pressure than if using carbs.
Injectors also have electrical connectors for wiring harness.
(think of them as a solenoid valve, high pressure fuel, switched open or closed Via the ECU, sprays into the airflow with better atomisation than carbs)
TB`s have a means of adjusting airflow through each butterfly and also a Throttle Postion Sensor TPS on the end of the butterfly shaft. probably also have vacuum take offs too.
Because of the better atomisation, you can run slightly smaller dia too with TB`s

ECU can run injection and ignition timing or just one or the other.
With a fully mappaple system you can control exactly how much fuel, when it is supplied, and over what period relative to Crankshaft position For every 100 RPMs if you really want to ;D
And also the ignition advance/retard at each of those points too.... It is even better with lairy Cams that wont usually idle, or carbs that fuel ok at the top end but Bog down off idle or foul the plugs etc.

You also have full control of Warm up (Choke) in all weathers, and the possibility of controlling fuelling for boost etc.... different ignition maps to aid traction by softening the power delivery......

Yes there is a lot to learn, but it is well worth it, and to get started is relatively easy.
Crank Trigger wheel
Bike Throttle bodies with injectors TPS Etc
Water Temp sensor
Injection fuel pump
Return line to tank
Emerald or Megasquirt ECU
Ability to make a decent wiring loom ;D

If you want some Throttle bodies, I have some complete with fuel rail and TPS that would be Ideal on a 1400
the Emerald site is really good reading for research
HTH
Dom

Thanks for the info,.. will have to read some more!,.. PM me details about the Throttle bodies,.. price etc. etc.