EFI 8-Port Project

This is a quick-and-dirty place holder page for this project. I'll do a better one when I have time

This is the original concept for the inlet manifold. The starting point was a manifold from a mid-90's Ford Escort. Unfortunately this did not leave clearance for the bonnet, so a decision was made to move the plenum down parallel to the block. Since full  engine management will be used, there is no distributor to interfere. 

Flanges were made from 1"x3" bar stock, then the manifold started with 1.125" U-bend tubing.
The plenum is sheet steel, rolled into a log with belled ports in the floor. Because the ports are splayed and angled up from the block the fuel rail was a bit of a challenge. Injector bosses were made from bar stock, drilled on an angle then lined up on 5/16" ridged tubing before they were silver soldered in place. 


The rocker cover supplied by Elder is not very refined and it needed a considerable amount of grinding to clear the 1.5:1 rockers. I thought it would be less work if I just made my own. Of course, I was wrong, but the end result is nice!










Instead of dealing with those horrible cork gaskets, a 1/8" groove was cut in the base flange so an O-ring could be inserted. It's cheap, won't move around and absolutely will not leak. Why don't they all do it this way?

The manifold is designed with 18" of runner length, which my calculations say will resonate at around 3000 RPM to give a nice flat torque curve. The runners will clear the grille of a round nose Mini.

The throttle body is 50 mm Mazda, the coil pack is from Hyundai and the injectors are Bosch 220 cc/min.

Here's the finished product. You can hear it running here

Yes, that is a waterbrake dynamometer hanging off the clutch end. Time did not permit acquisition of any meaningful power data, but 2007 is another year.

This is an older photograph of the 200 Hp Land and Sea snowmobile dyno. Updates have been the addition of a data acquisition system that records EGT on all 4 branches, two channels of O2, crank position, RPM, system temperature and, of course, torque. The DYNOmite torque arm with it's single bridge strain gauge has been replaced by a full bridge strain gauge
Before you Email me to ask how the dyno is driven, here's the adaptor to get from a Mini crank taper to the snowmobile taper. All these parts were fabricated in the garage workshop.