32 replies to this topic

[PoolGuy]

There’s a thread somewhere on TMF that has details of a cam sensor using a Hall effect sensor in the timing backplate. 

[mini13]

Well.... the 8 port cams would be on a billet anyway, so it shouldbnt be an issue to get one done with the MPI trigger intstead of a fuel pump lobe, might cost a bit more though.

 

 

 

Alternator location aside, the original 8 port was designed to be run with fuel injection.  I've seriously considered building an 8 port on MPI block, mostly as there are plenty of cheap unmolested MPI blocks out there.

 

The large valve 8 port heads recommend a +60 thou or 73.5mm piston. I understood that the modern Arrow/Saenz conrods will clear the cam lobes. Personally I'd run a pre-verto clutch as there are more options available and use a crank sensor on the crank damper; as opposed to the MPI that uses the flywheel for engine position. 

 

While it's possible to set up a modern ECU without cam position it is a desirable thing to have. On non MPI blocks I've used a modified distributor for this. However, on an MPI block it's not so clear if the existing 8 port cams from MiniSpares/MED would work with the stock MPI cam sensor as I've no firsthand experience with the MPI blocks.

 

[DeadSquare]

In the early 1960s, a company called "Simms Motors" made a 20 fag packet sized fuel injection unit, that ran off the Formula Junior auxiliary cam gear.

 

At MIRA,, passing an ultrasonic emitter by a 30MPH restriction sign, they tuned the unit to act as a speed limiter, reversing the process as it passed a derestriction sign.

 

If that could be done then, speed clearly can't have be seen as more important by the  government, than windscreen washers, seat belts, daylight running lights and a ring of stars on the numberplate.......................... if fines could add to their coffers.