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

[cnavarro]

Tom, I still have the original plenum that we fabricated. Based on models with Engine Analyzer Pro, we found that a configuration or 130 cu inches and runner lengths of 10.5 inches would have the proper tuning characteristics for the flat four. It comes out to a very odd shape for the overall width of the engine, that's why it had a sweeping profile matching the top of the cylinder tin and case. I can post pictures when I return from CA next week.

Charles Navarro
LN Engineering
http://www.LNengineering.com
Aircooled Precision Performance