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Author Topic: Ignition timing vs EGT's  (Read 36359 times)

DmC

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Re: Ignition timing vs EGT's
« Reply #30 on: September 09, 2009, 01:51:21 PM »
do you use a borescope Joseph?
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Joseph Davis

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Re: Ignition timing vs EGT's
« Reply #31 on: September 09, 2009, 02:05:16 PM »
I have to on Subarus and SBF.  The inline 4's and mod motors are nice, you can peer right down on the piston crowns with a flashlight.  D-series are a bit of a whore with how the plug comes in at an angle so you have to manually turn the engine over to look at crown vs outside. 
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d112crzy

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Re: Ignition timing vs EGT's
« Reply #32 on: September 09, 2009, 02:17:23 PM »
Carbon trails, I understand what it means but I'm unsure of what exactly to look for. care to explain a little?
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Joseph Davis

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Re: Ignition timing vs EGT's
« Reply #33 on: September 09, 2009, 03:44:31 PM »
Quote from: d112crzy on September 09, 2009, 02:17:23 PM
Carbon trails, I understand what it means but I'm unsure of what exactly to look for. care to explain a little?

It's just like reading a plug, only simpler.  A healthy engine forms a healthy carbon trail.  Too rich, soot.  Too lean or ignition too retarded (or sometimes nothing's wrong it just blew all the crap on the piston off and hasn't formed a healthy coat yet), bare.  Blowby problems due to too much ignition timing or lack of crankcase ventilation or in the case of D-series over 7.x:1 CR, wet with oil.  Pre-detonation forms tiny tiny pinholes in the carbon coat where you can see fresh shiny aluminum when you start running out of octane but are still making good power, or you are within your octane limits but feeding the engine too much timing.
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Joseph Davis

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Re: Ignition timing vs EGT's
« Reply #34 on: September 09, 2009, 04:20:50 PM »
What the fuck are you talking about?  I love D-series, it's purpose built high CR turbo D-series ignorance that I hate.
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98vtec

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Re: Ignition timing vs EGT's
« Reply #35 on: September 09, 2009, 05:00:48 PM »


are you able to form any analysis on that?

Personally, i think it looks like i am getting great flame coverage but i know less about reading piston tops than i do reading plugs.
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Conceptz-X

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Re: Ignition timing vs EGT's
« Reply #36 on: September 09, 2009, 06:56:26 PM »
I believe Joseph is referring to Carbon Trails in a fresh engine, you have some hard carbon buildup.  Its far more difficult to read like that vs. a fresh clean piston
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Joseph Davis

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Re: Ignition timing vs EGT's
« Reply #37 on: September 09, 2009, 08:35:37 PM »
Theres only so much crap that can stick to a piston, it's all valid.

Can I get a higher resolution picture?
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TTC

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Re: Ignition timing vs EGT's
« Reply #38 on: September 10, 2009, 09:00:39 AM »
I've always had egts, and frankly they have always been hot.  In my WRX they were hitting 1500F during long wot runs.  My probe was prolly what, 4-6" from the ports.  In my 4agte same shit, i hit at the most prolly 1500 but im pretty sure its cooler now than it was originally.  Honestly I don't remember, my fuckin defi probe died and im to cheap to fix it.
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dvst8r

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Re: Ignition timing vs EGT's
« Reply #39 on: September 10, 2009, 10:50:25 AM »
I use an egt gauge, but I would rather use a wide band, the problem being that I can't get a wide band to last more then one pull before it is so clogged with soot that it doesn't read any more...  :'(
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patsmx5

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Re: Ignition timing vs EGT's
« Reply #40 on: September 10, 2009, 12:26:36 PM »
Quote from: dvst8r on September 10, 2009, 10:50:25 AM
I use an egt gauge, but I would rather use a wide band, the problem being that I can't get a wide band to last more then one pull before it is so clogged with soot that it doesn't read any more...  :'(

What engine and fuel are you using? Does the heater in the O2 sensor work? What kind of wideband?
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dvst8r

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Re: Ignition timing vs EGT's
« Reply #41 on: September 10, 2009, 01:12:54 PM »
LOL, Cummins 5.9L Diesel.  :P
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98vtec

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Re: Ignition timing vs EGT's
« Reply #42 on: September 10, 2009, 02:04:22 PM »
Quote from: Joseph Davis on September 09, 2009, 08:35:37 PM
Theres only so much crap that can stick to a piston, it's all valid.

Can I get a higher resolution picture?

nah, i sure dont.  Next time i pull the head, i will take some better shots.
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