Wierd application, hypothetical question.

[Pat Ford]

 why not use a diaphragm(SP??) like a waste gate that way you can vary the enrichment. You are aware that it might not be needed anyways

Previously, you (Shirley, Mark R) wrote:
{ Hope you guys can help.  This is gonna sound wierd, but here goes.
{ 
{ I have a small 4cylinder diesel engine (not VW) that I am going to
{ turbocharge.
{ The engine was never available turbocharged, so there's no way to use the
{ stock
{ fuel pump for boost enrichment.  As anybody who's familiar with diesels
{ knows,
{ there's a fuel screw on the side of the pump that pushes on a cam inside the
{ pump for enrichment.
{ I wanted to try and use a coil and plunger arrangment to push on this cam,
{ only when
{ under boost.  So what I am thinking is a 12V, PWM output based on a
{ MAP/boost sensor
{ input, and maybe Air temp.  How simple would such a circuit be?  I am not an
{ EE, but a ME, with a little EE experience.  Programming is not a problem.
{ Designing circuits, that's a
{ different story.
{ 
{ So MAP / IAT  --->  processor or circuit  ---->  single PWM output (could be
{ high amperage,)
{ 	
{ (depends on the force 
{ 	
{ (needed to overcome pump
{ 	
{ (internal spring press.)
{ 
{ If there was an easy way to do such a system, would it be easily tunable?
{ Pots on a breadboard, or laptop?  A lookup table seemed the simplest to tune
{ to me, but perhaps
{ not to build.
{ 
{ Any help is appreciated.
{ Thanks!
{ Mark
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--
Pat Ford                           email: pford at qnx.com
QNX Software Systems, Ltd.           WWW: http://www.qnx.com
(613) 591-0931      (voice)         mail: 175 Terence Matthews          
(613) 591-3579      (fax)                 Kanata, Ontario, Canada K2M 1W8

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