[TheSilverBuick]

Originally Posted by Fishin2Deep4U

I am also building a oil pump drive/ cam position sensor. I did consider and still may use, the now empty hole where the mechanical fuel pump used to be.

I have the drawings, and it would be very easy to machine a poll gear in place of the fuel pump eccentric. Then a very simple block off plate housing a hall sensor.

Oooh, I wonder if the fuel pump eccentric could be used directly as the cam sensor! Rotate the engine such that the high point is facing the fuel pump openning, thread a hall sensor into a block off plate (angled towards the cam) until it touches the eccentric, then back off a hair. Or find an OE sourced hall sensor that has a long nose and make it fit a block off plate, such that it picks up the top of the eccentric and loses signal on the back side of the eccentric.

Dodge uses a half moon disc for it's cam sensors on the 318, and the principle would be the same only a shorter singal interval. I don't know how other ECU's would handle it, but the MegaSquirt would probably work perfectly off a setup like that as long as the timing chain or something doesn't screw with the signal. Just needs one pulse per 720* of crank rotation. Definately has given me something to think about for possibly another engine, or even the OHC six.

[Fishin2Deep4U]

Originally Posted by TheSilverBuick

Oooh, I wonder if the fuel pump eccentric could be used directly as the cam sensor!

The simple answer is yes. Especially with a gear tooth type hall sensor.

But, I want a sharper rising and falling edge. A very simple flat tab with a 90 bent into the end will work. Possibly cut off material on either end of the polled area to create loss of signal. BTW, the Chevy Vortec dizzy uses a poll gear arrangement as well. It's another one to look at.

I actually have a modified front cover that also works, but it's not as simple as the fuel pump block off. It requires precise positioning and the possibility of cam trust can affect the min/ max free air tolerance. The easiest answer is the oil pump drive/ sensor. All in one, wiring to the rear of the block. This is why I considered the Ford Explorer sensor. Again, easily accessible to replacement parts and cheap to boot. The hard part is grafting the pieces together and I have attempted to source some dizzys for this purpose.

I will be machining the parts at work, but I am trying to come up with a dirt cheap, DIY for the masses method of doing this.

But at hand, Where's our EFI specific forum?

Dave

[BruceWilkie]

Originally Posted by Fishin2Deep4U

The simple answer is yes. Especially with a gear tooth type hall sensor.

But, I want a sharper rising and falling edge. A very simple flat tab with a 90 bent into the end will work. Possibly cut off material on either end of the polled area to create loss of signal. BTW, the Chevy Vortec dizzy uses a poll gear arrangement as well. It's another one to look at.

I actually have a modified front cover that also works, but it's not as simple as the fuel pump block off. It requires precise positioning and the possibility of cam trust can affect the min/ max free air tolerance. The easiest answer is the oil pump drive/ sensor. All in one, wiring to the rear of the block. This is why I considered the Ford Explorer sensor. Again, easily accessible to replacement parts and cheap to boot. The hard part is grafting the pieces together and I have attempted to source some dizzys for this purpose.

I will be machining the parts at work, but I am trying to come up with a dirt cheap, DIY for the masses method of doing this.

But at hand, Where's our EFI specific forum?

Dave

That is a good description of a late 80's efi buick v6 cam sensor flag... Wouldnt be hard to mod a fuel pump eccentric to look similar... been 10 yrs but I seem to recall the sensor flag on my buick was @ 1/2"- 5/8" wide.(BTW all my 88 EFI fwd motor stuff including roller cam and heads/intake/oil pump/timing cover fit my rwd 82 Cadillac/Buick 252 just fine... was going to be a street rod motor... my son was storing it when I 1st moved to Tn... junked it by mistake and kept the blown up 231 fwd block... he was rather embarrassed...I'm still ticked.)

EFI controller like MS can make for a fine ignition controller and for data logging if you really dont want efi or feel you have to run a carb...

I think a seperate efi forum would be nice.