*This is all just musing, I have no intentions on doing this... For now*

I'm in a bit of a lull waiting on my EA82 getting rebuilt and that's given me time to think. 

I remember seeing an old rally video showing a race spec EA82. The dual-carb setup they had going got me thinking. What if you did a dual setup using two SPFI throttle bodies rather than carbs? From what I remember the carbs on the rally engine were basically set directly on top of the intake ports either side of the engine.

I don't have extensive experience with engines and I only have limited experience to base my ideas off of. Regardless, here's what I'm thinking.

An N/A EA82 with MPFI heads (for better flow) with dual SPFI throttle bodies. Setup a quad exhaust (would take some tinkering with the internally split single exhaust ports). Most likely setup with a custom ECU (megasquirt or something similar).

The power gains wouldn't be what I'd be going after, rather just an experiment using an outdated engine for the fun of the challenge.

Any thoughts? Ideas? Book recommendations to help me better understand the math of engine design?

I don't remember reading of anyone doing this but I think it'd be interesting to see it done.

Obviously there's a lot that'd have to be considered. Injector CC's, how to plumb the cooling system into the throttle bodies and engine block, sensor locations, etc, etc. I'm just thinking out loud here.

:]

One way to look at it would be to halve the injector size and have the two batch fire together. 

The MPFI system batch fired two injectors together. A similar thing could be done with what you’re suggesting. You would have to find out voltage requirements etc to run two injectors at the same time. 

You may need to look into throttle body size too as this will have an effect on throttle and engine response - or lack of. 

As for other sensors, no need to move them. One AFM will still do the trick. If you’re going to have a go at this, a) don’t waste you time and money, b) just plumb both intake tracts together to the AFM and run all the breather lines etc in the single section of intake pipe so both sides suck as much oil mist as the other. 

It would be cool to see I guess. At the end of the day there would be little performance gain without going into intake runner lengths to the heads, cams, lack of or addition of a plenum chamber - and what size to use if going this route. Lots to mess around with. Lots to learn about engine design considerations and performance. 

Even better would be getting something to run reliably on methane… 

Cheers 

Bennie

Instead of dual SPFI, let's go for *quad* SPFI!  ...  oh, wait, that's just a MPFI manifold swap.