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Old 01-20-2020, 02:02 AM   #1
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Default Espar D4/B4 glow plug question

Is the glow plug only active during start and shut down? Or does it occasionally turn on while running?
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Old 01-20-2020, 02:19 AM   #2
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Default Re: Espar D4/B4 glow plug question

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Originally Posted by wankel7 View Post
Is the glow plug only active during start and shut down? Or does it occasionally turn on while running?
Only startup & shutdown.
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Old 01-20-2020, 03:50 AM   #3
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Default Re: Espar D4/B4 glow plug question

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Only startup & shutdown.
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Old 01-20-2020, 04:04 PM   #4
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Default Re: Espar D4/B4 glow plug question

On the B4 it skips the shutdown glow plug activation. That and a slightly different fuel pump ramp up are the differences in the D4 vs B4 controller.
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Old 01-23-2020, 07:52 PM   #5
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Default Re: Espar D4/B4 glow plug question

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Originally Posted by rollerbearing View Post
On the B4 it skips the shutdown glow plug activation. That and a slightly different fuel pump ramp up are the differences in the D4 vs B4 controller.
I'm running a B4 ....it seems to glow on shut down...maybe they changed things?
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Old 01-23-2020, 08:26 PM   #6
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Default Re: Espar D4/B4 glow plug question

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Originally Posted by wankel7 View Post
I'm running a B4 ....it seems to glow on shut down...maybe they changed things?
It's possible. I've not yet installed my B4 in my other vehicle to know for sure what it does. I'm going off the operation chart/graphs in the Espar literature. They also use a capillary tube inserted into the length of the regular D4 burner fuel feed tube. I believe that they do this (and skip the last glow) in order to minimize vaporizing any additional fuel into the chamber at the cycle end. It's possible they changed things.

I looked into this pretty thoroughly to figure out if a D4 could run straight gasoline safely.

I did run a D4 that way on a test bench and it started fine. Not saying that it is "safe" however.

If your unit is used or refurbed it's possible somebody put a D4 computer into the B4 case - that could also perhaps explain things. As far as I could tell the only differences between the D4 and B4 were that capillary and the different ECU programming.

Last edited by rollerbearing; 01-23-2020 at 08:28 PM.
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Old 01-24-2020, 01:20 AM   #7
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Default Re: Espar D4/B4 glow plug question

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Originally Posted by rollerbearing View Post
It's possible. I've not yet installed my B4 in my other vehicle to know for sure what it does. I'm going off the operation chart/graphs in the Espar literature. They also use a capillary tube inserted into the length of the regular D4 burner fuel feed tube. I believe that they do this (and skip the last glow) in order to minimize vaporizing any additional fuel into the chamber at the cycle end. It's possible they changed things.

I looked into this pretty thoroughly to figure out if a D4 could run straight gasoline safely.

I did run a D4 that way on a test bench and it started fine. Not saying that it is "safe" however.

If your unit is used or refurbed it's possible somebody put a D4 computer into the B4 case - that could also perhaps explain things. As far as I could tell the only differences between the D4 and B4 were that capillary and the different ECU programming.
Interesting....I got it from Heatso.

Can you share the documentation that your referencing?
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Old 01-24-2020, 05:03 PM   #8
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Default Re: Espar D4/B4 glow plug question

Looking for that doc. Most of the docs show just the D2 and D4 operation "graphs". Somewhere I did finally find the graph for the B4 as well - but am having trouble locating it again. It's out there though if you want to poke around for it.

What's up that you are trying to figure out about this anyway - power sag issues? Other?

Page 17 of this PDF link has the graphs for the D2 & D4 and somewhere you can find the B4

http://www.esparofmichigan.com/cms/u.../airtronic.pdf

In one of the manuals there is a footnote saying that the timing of these graphs can vary depending on which particular ECU you have - so obviously they change things from time to time.

Last edited by rollerbearing; 01-24-2020 at 05:09 PM.
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Old 01-27-2020, 11:32 PM   #9
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Default Re: Espar D4/B4 glow plug question

Generally, pondering the unponderable :)

Here is what I'm noticing...

If you have it on infinity....and it gets too warm it goes to standby....it doesn't glow when it turns off and waits for the setpoint to be reached

But if you turn it off...it glows.
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