Fuel Injection

The Royal Enfield Interceptor is fuel injected and has 4 valves per cylinder. However a good two valve motor can be as quick as a four valve. The trouble with carburettors is you cannot run them lean enough to get best power without changes in the weather affecting them. Fuel injection gives better control.

 
Personally I think worthwhile improvements on a road-going Commando should be directed at improvements to reliability, rideability and increasing enjoyment of ownership (yes - I know that's very subjective) such as eliminating leaks, making them easier to kick-start, etc.

If you really feel the need to go faster there are a sqillion bikes out there that will go much faster than a Commando - go buy one of them.
 
You should be able to get a Commando motor going fast enough without increasing it's capacity. And a real race cam usually moves the power band up the rev range. However, if you rev a Commando motor over 7000 RPM, you are really asking for it. Compression ratio is limited by the fuel octane rating. What you are left with is an attempt to get better control over fuel/air mixture. In a normal carburetor, the taper on the needles is there to compensate for loss of vacuum as you open the throttle. It also determines how fast you can open the throttle. If you want good throttle response, you usually use a quicker taper. But when you do that you probably often richen the mixture too much, so it is never at the optimum for best power. The FI usually monitors the exhaust and the ignition advance, so the control over mixture is probably better.
With normal Commandos there are two sizes of specified needle jets 0.106 and 0,107 ? The best size is probably somewhere in between and changes all the time as you ride the bike.
 
Soooo who's going to be the first to adapt the fuel injection from a Royal Enfield to a 850 Norton? IT CANN'T BE THAT HARD!!!
 
More speed, more Power!!! I love the smell of dead dinosaurs being burnt
 
The Royal Enfield Interceptor is fuel injected and has 4 valves per cylinder. However a good two valve motor can be as quick as a four valve. The trouble with carburettors is you cannot run them lean enough to get best power without changes in the weather affecting them. Fuel injection gives better control.


Doesn't Mr. Comstock run FI on classic Commando?
 
I wonder who manufactures the RE fuel injector ? Somebody might be able to sell aftermarket kits for Commandos..
 
Reading the OP's linked RE article got me to thinking, FI has been a thing since at lease the second world war (Germany had it in their fighters). So how did early types function before there were micro computers to sense pressures, temps, O2 levels and control injection?
 
Reading the OP's linked RE article got me to thinking, FI has been a thing since at lease the second world war (Germany had it in their fighters). So how did early types function before there were micro computers to sense pressures, temps, O2 levels and control injection?
Simple. They just hosed fuel in regardless.

Thats why it took until the electronics caught up to make them viable on large scale production vehicles.

IMHO I think you’d have to do an awful lot of R&D of both the injection system, and the engine, in order to make an injection system on a Commando perform any better than some of the already excellent off the shelf carb offerings we already have available to us.
 
No they didn't just hose it! Look at a fuel Dragster. There are several valves and solenoids that regulate the fuel @ throttle position. Also there are "pills" jet sized that also regulate fuel like a main jet in any carburetor I have seen early fuel injection driven on the street but never worked like I would expect. Chevy Corvetts and Pontiacs had it in the 50's but the gasoline wasn't ready for that use, to much dirt!
 
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