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My week

D

David G

Well-known Member
I have this week on vacation, and really looking forward to it.

I worked on MH44 today. I have the coil pack bracket and one injector bung done. I will get the second bung done and both epoxied in this week. I made a jig to hold the bungs straight while the epoxy dries.

Gonna help buddy with putting up mezzanine in his shop tomorrow.

I need to get cam mapped on MH44 so I can tell at what degrees I can inject fuel. Cylinders 1&2 and 3&4 share a common intake runner. There is a time when the intake valves are both open on the common cylinders. I cannot inject during that time, so have to know how many degrees I have to inject fuel. That corresponds to so many milliseconds at maximum RPM.

Thanks for bearing with me on this, it has been quite the learning experience.
 
Datsun 280Z 6 cylinder FI had 6 intake runner injectors within about 1.5 inches of the head. (Bosch designed) The CPU had only two transistors used to ground the injector coils. They were each connected to either 123, or 456. They were far from timed to the intake stroke. I am not sure it makes a critical difference unless you are trying to produce a stratified charge. Probably not realistic on the MF. Jim
 
The issue is the shared intake runners, you cannot guarantee which cylinder gets the fuel unless you control the injection timing. I would have no issues if there were an intake runner per cylinder.
 
(quoted from post at 09:51:18 01/01/14) The issue is the shared intake runners, you cannot guarantee which cylinder gets the fuel unless you control the injection timing. I would have no issues if there were an intake runner per cylinder.
Click to expand...
The crankshaft makes two revolutions to one camshaft revolution.
Draw yourself a circle and divide it up into 720 degrees, this will represent one full camshaft revolution.
Now you can divide this by your 4 cylinders and mark out where each cylinder goes through intake, compression, firing and exhaust, piston up piston down etc.
Once you have that you will easily be able to mark out your valve opening, duration and closing.
Apply your cam to crank timing value and you will have a clear picture of what is going on.
 
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