Good to hear. If I go the two reducers route, I've a fair amount of plumbing to do.
Never occurred to me that it could be manipulated in that way - a bumpy road could make life interesting!LPGC wrote: ↑Sat Sep 12, 2020 9:56 pmThe idea behind installing the reducer facing sideways is so the diaphragm movement which should correspond to signal isn't affected by forward/backward acceleration/deceleration of the vehicle, so it doesn't matter which way (forward or backward) the adjustment screws face. Cornering forces are much lower than acceleration / deceleration forces... If you wanted both a bit of idle bypass and a bit more flow for a given signal then instead of dialling in a bit of idle bypass using the adjustment screw you could try fitting the reducer with it's outlet pointing face down so gravity would constantly pull down on the diaphragm a bit. I've never done this as part of a permanent install but I have experimented and seen richer mixtures, though mostly affected low load operation.
It did cross my mind that the diaphragm could be manipulated by varying the pressure it sees on its reverse (control/reference) side eg, connect to manifold vacuum. That thought occurred as it would reduce my richness at idle. But when manifold pressure starts to drop at high rpm the mixture would be leaning off again. With a less restrictive mixer though... Possibly too course a manipulation?
It's the transients that concern me. Points to mounting both reducers (if I go that route) together. Simplifies the rest of the plumbing too - at the cost of relocating the battery (not that big a deal as the truck had a dual battery option so has space spare in the opposite side corner).
This appears to be my salvation at the moment.
I'm going to try this before I do anything else.LPGC wrote: ↑Sat Sep 12, 2020 9:56 pmYes I have used both outlets from an R90 reducer, I expect the same as TT in that you'll get a bit more flow from the reducer using both outlets, not double the flow but a bit more. At least in part for the same reason we'd expect the usual 19mm pipe to flow more than if you used 12mm or narrower pipe (narrower pipe is often used on small engines between reducer and mixer, albeit using a 19mm>12mm adaptor if using an R90 or similar spec vaporiser). But with more volume in pipes you get slower response.
My current thoughts on response are that it is good enough (and must remain so) to avoid back fires but as such transients are brief compared to maybe 10-15 seconds of WOT for overtaking, WOT must be rich enough.
My suspicion is that I'm going to have to resort to dual reducers. Two working with less bias (I am almost certainly having gas at pressure exiting the reducer) would alleviate the rich at idle and provide enough gas to properly exploit the new mixer. Dual outlets from the single reducer first though.