efi A Cam Position Sensor design - please critique

[jimk]

2 hours ago, Healey3000 said:

I suppose one could fill the pump and lines with liquid and run input to output

Must add to the scheme a method to dissipate the heat from the liquid.  The work input to the pump has to go somewhere and it will go into heating the liquid.

 

The pump usually pumps a cool liquid (relatively cool anyway) and the components may not hold up with hot liquid.

[Healey3000]

Excellent point. Let me now get to work on a way to nullify the first law of thermodynamics 😉.

[Son of Marty]

A small power steering oil cooler would work fine.

[Healey3000]

This thing is wandering into Rube- Goldberg territory now! Are we better off with just semi sequential injection at this point?

 

Still, a fun mental exercise.

[veronatii]

Here’s a proper solution if you’ve got an extra $830 laying around..

 

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[Healey3000]

Hi,

 

A question for those who have a diaphragm from the original or replacement pumps (the kind that can be taken apart to replace the diaphragm) - is the metal disk that forms the central part of the diaphragm ferromagnetic? Pictures of this would be useful too, if you have them.

 

Thanks.

[Healey3000]

Hi,

With an e30 intake and MegaSquirt installed, would the mechanical fuel pump interfere with anything?

 

Thanks.

[AustrianVespaGuy]

Err, I'm almost certain it would interfere with the fuel rail, but don't currently have a pump anymore to 100% confirm.

[Healey3000]

Thanks. At your convenience, if you could estimate how much room there is from the mounting face, that would be helpful.

[AustrianVespaGuy]

Well, sensor installed and passes bench test! Collar with small spring trick seems like it'll work great! Apparently the sensor has an internal pull-up, FYI, no external resistor needed! Now to just get the engine all back together and in the car to really test!

[veronatii]

2 minutes ago, AustrianVespaGuy said:

Well, sensor installed and passes bench test! Collar with small spring trick seems like it'll work great! Apparently the sensor has an internal pull-up, FYI, no external resistor needed! Now to just get the engine all back together and in the car to really test!

 

Looks great!! 

[Healey3000]

7 minutes ago, AustrianVespaGuy said:

Well, sensor installed and passes bench test! Collar with small spring trick seems like it'll work great! Apparently the sensor has an internal pull-up, FYI, no external resistor needed! Now to just get the engine all back together and in the car to really test!

 

Hi,

 

What's the temp rating on the sensor? Why is a spring and collar required. Sorry, I'm not been keeping up with the various designs.

 

Thanks.

[AustrianVespaGuy]

140C/284F. Collar/spring is needed to help hold the sensor in position, as the threads aren't quite long enough/not quite enough room in there to use nuts safely/effectively.

[Healey3000]

Will it survive the temperature? I've read it can be around 200 C.

 

A question - when the lobe is at maximum (presumably as shown in your pic.), how much of the sensor sticks out (dimension)?

 

Thanks

[AustrianVespaGuy]

Maybe, we're gonna find out empirically here! It's definitely kinda borderline, but this is pretty high up/outboard in the head so cooler than oil temp. Will try to measure for you, but probably about 4-5mm.