sorry guys, not been on for a while, I have the fuel injected BIS of which Stuey spoke.......
Before we get carried away, we are developing fuel injection for utility engines (Ride on mowers etc) and low cost motorcycles up to about 250cc. The target is to deliver the emissions benefits of fuel injection but at about half the normal cost. I wanted to run the system on a car just to see what would happen, and that's why I bought the bis. I installed a system which had been prototyped on a 22hp ride on mower engine.
I haven't really measured the performance, but I would say it did improve the low and mid range response, but not much change at the top end because the throttle bore I am using is quite small. In any case, because the system was intended for a 22hp engine, I don't have much spare fuel delivery capability even if I tune it more.
Owing to an error on my part, a washer went through the engine, so I rebuilt it and at the same time skimmed the head to take the compression to about 9.3:1. This I think has improved the torque further, although it has some detonation risk now.
My engine management system has the ability to control the ignition timing, I haven't got round to setting it up but I think compression ratio increase plus mapped ignition will help all round. I would suggest looking at the megasquirt system (our controller is not available for sale at the moment and is specific to our injector design (still prototype only).
I thought about porting the head a bit but again, didn't bother because I don't have more fuel delivery to match.
Some people have suggested that the transmission strenght could be an issue. The engine is only 2 cylinder so although the torque is low, the peak torque within the cycle may be quite high. In dyno testing single cylinder utility engines we have often destroyed drive couplings that were supposedly much stronger than the engine needed, but the thinking didn't account for it all coming from one big thump instead of 4 little ones.
I haven't done much on the BIS recently because I had to complete the annual restoration of my cinq sporting for the MOT, and now have some work to do on my Lotus, but I just got hold of some new wheels to put on the BIS so it might get out and about again - the steel wheels had corrosion/ leak issues.
that's it for now ........
Gav