Thread: EGT Gauge

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2008-12-06 21:45:06

#21

boostin50

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Originally Posted by BenFenner

Yes.

Any more questions?

I know you're trying to be a smart-ass here (you're succeeding by the way) but since diesel engines have no spark plugs, they use fuel injection as their ignition event. This timing is even more crucial to get timed right, and thus it makes complete sense that diesel engines make use of EGTs for ignition timing monitoring.

Yes Ben please explain more.. I really wanna know why the moment the fuel is delivered in a desiel is so important to when it ignites....

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2008-12-06 21:56:53

#22

BenFenner

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Originally Posted by boostin50

Yes Ben please explain more.. I really wanna know why the moment the fuel is delivered in a desiel is so important to when it ignites....

The diesel engine uses a four-stroke combustion cycle just like a gasoline engine. The four strokes are:

Intake stroke -- The intake valve opens up, letting in air and moving the piston down.
Compression stroke -- The piston moves back up and compresses the air.
Combustion stroke -- As the piston reaches the top, fuel is injected at just the right moment and ignited, forcing the piston back down.
Exhaust stroke -- The piston moves back to the top, pushing out the exhaust created from the combustion out of the exhaust valve.

(some emphasis mine)

Source: HowStuffWorks "Diesel Engines vs. Gasoline Engines"

Anything else you'd like me to explain?

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2008-12-06 22:24:33

#23

boostin50

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Good job you saw the same site I did. Now tell me how that converts over to EGT's!

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2008-12-07 00:47:31

#24

BenFenner

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Originally Posted by boostin50

Good job you saw the same site I did. Now tell me how that converts over to EGT's!

Done:

http://www.sr20-forum.com/turbo/11593-lets-talk-gauges.html#post151212

FYI: If you'd read this entire thread and associated material you'd have found it without me having to point it out to you.

Also, if you've read the website, why am I having to explain it to you? I can only assume there's a point to all of this at the end, so I'll play along, but if you'd like to cut to the chase I wouldn't mind.

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2008-12-08 01:46:30

#25

BenFenner

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So boostin50, do you see why EGTs are important for tuning timing now?

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