I am going to try water injection at some point as I have already got the gear made up for it.
The plan was to get a good dyno run without and a run with water injection and then turn the injector off at the point the two graphs cross over.
At first it seemed simple to me, if I could get a power extension at the bottom, the two graphs joining together nicely with the top end revving out like before then the thing should work.
But of course a full on dyno run is not like picking your way through the twisties where you are on part throttle a lot of the time using that low end grunt. Not a lot of people apex a slow corner using full throttle.
So it’s likely that enough water to tame the fire at full throttle on the dyno is going to be way to much at quarter throttle and some moderation of the water according to engine load will be needed.
This complication with water injection makes the simpler open/closed ATAC idea Wobbly proposed look much more attractive and variable crank case volume looks interesting too.
I am going to look at all of these ideas some day but at the moment the problem is getting the carburator tucked in out of the way when using the Vtec variable inlet timing device. I think the variable timing is important as it better matches the inlet to high and low rpm.
If I am going to have good low down grunt then I need good low down carburation. So far nearly anything I do seems to add length to the inlet and that shortens the power spread by cutting back peak power and over rev.
I have ordered a 24mm pumper Kart carb, I don’t really need the pumper part but the carb is quite a bit shorter and can be bolted directly to the engine without a rubber mount saving a lot of valuable mm’s.
1st things 1st, when the variable inlet timing and carburation is sorted then I will see what can be done with the pipe for more low end.
Bookmarks