FI Plenum Design, MS'ing my 2270 Options

[Tom Perso]

Hey Guys,

I am designing a MS system for my 2270 (163.86b cam, 48x38 valves, future Triad header). I am looking at running stock intake runners and possibly making a new plenum to run my Ford TB (probably from a 4.0L Exploder/Ranger).

Are there any "design guidelines" that should be followed when making a new plenum, such as a certian volume required for engine displacement?

Looking at space requirements, I see running the TB on top of the plenum is the only way to go. That, of course - begs the question... Is the stock 914 2.0L plenum a good starting point to modify to allow for the Ford TB?

Here are some pics for reference... I had a Bus 2.0L intake system to borrow, so I am basing my measurements and ideas off of that.

http://www.qtm.net/~persot/MS/

Any ideas, suggestions, etc, are appreciated!

Thanks,
Tom

[DNHunt]

I think a more accurate statement is I got it to run. I believe it will work, idle was no problem and near wide open throttle was not a problem. Cruise and over run still need some work. Over run and decel are a problem because the large injectors are openning for such a short time that 0.1ms change causes a significant change in air fuel ratio and the engine flucuates between rich and lean. During cruise the MAP was flucuating and the car would stutter. I'm not sure what this was caused from and at the time I was more concerned about the amount of oil I was using.

I really believe that this setup will work on my engine but one of the considerations when the engine was designed was FI and a common plenum.

Dave