Thread: 2.6 Engine Improvements

Originally Posted by bacicat

Quite easy by the look of it - there are heaps of tuners out there working on these - one of the reasons I think I can get it to work. I don't think you can connect a computer directly to them, but rather flash an EPROM and install it. It may take a bit of findling around, but doable I think.

Cool. Eeprom is better for diy, you can burn several chips to try and start swapping.

Batch fire means some squirting at open valves, some squirting at hot shut valves.

Originally Posted by Dougal

Batch fire means some squirting at open valves, some squirting at hot shut valves.

Ok, so when the valve next opens, it sucks in what has already been squirted in there? So, it doesn't really sound like injector timing is too critical which would probably be an advantage in this case as some of the injectors will be at different lengths from the inlet valves due to where I can put them.

Have I got that right?

So, just found out that the auto ECU will work fine with a manual, just needs the inhibit switch bridging out, so all good on that front.

Well, looks like it should all work ok. Just found a site that is all about how to program these ECU's and there are many examples of older inline 6's being injected with this setup. Got to go and do a lot of reading, but when I'm ready to go, I'll be grabbing a cheap dunny door as a donor and seeing what I can do.

Originally Posted by bacicat

Ok, so when the valve next opens, it sucks in what has already been squirted in there? So, it doesn't really sound like injector timing is too critical which would probably be an advantage in this case as some of the injectors will be at different lengths from the inlet valves due to where I can put them.

Have I got that right?

Well in a batch fired engine the injectors aren't co-ordinated to the valves in any way. Something you might find is that if the individual inlet runners aren't long enough, one cylinder scavenges some of the fuel injected into an adjacent cylinder. I had huge troubles setting up an LPG injection system onto a single plane V8 manifold before giving up in disgust for this reason. EFI manifolds seem to have long runners to avoid this problem. To be honest I'd be trying a throttle body injection system first, EA Falcon springs to mind. Once the fuel/air mixture is in the manifold it can be shared as needed by any cylinder. Unless you design a new inlet manifold for the 2.6 (is this possible?) this would be a safer bet. The thing with petrol injectors is also that they are angled precisely so that the atomised fuel evaporates substantially in the runner before induction instead of sticking to the duct walls. I doubt if random placement of 6 injectors would achieve an even result.

Thanks for that, that gives some things to ponder. A new manifold is out of the question as it forms part of the head. Will have to do some more research. Was only thinking of the Holden system as it is dirt cheap and there seems to be plenty of support out there for it.

Originally Posted by bee utey

... Unless you design a new inlet manifold for the 2.6 (is this possible?) this would be a safer bet. ...

You could always use a Westlake head off a NADA spec SIIa 6 cyl or Rover 3 litre car. They have a separate manifold, however you will likely have to modify the bypass hose to the Land Rover water pump or use the 3 litre waterpump.

You will also have minimal clearance between the Westlake manifold/SU carby and the steering box on a RHD Land Rover.

Changing the head wouldn't be noticed but would the addition of fuel injection mean it has to be engineered when it comes to rego ??


Colin