Hears a thought.
With the newer Plugs and I believe you could use a Glow Plug Relay with the After Glow function.

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84 300D, 82 Volvo 244Gl Diesel

I was thinking the same thing, especially if he's using duraterm gp's. Then again it would make the system more complicated.

Steve A

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Steve A
92 W140 OM603
97 VW Jetta TDI
90 Passat variant TDI 6 speed MT
94 Chevy K1500 6.5TD
05 E320 CDI
+ others

Yes, it is more complicated.
I was thinking of those folks who have low compression issues with hard starteing where ounce the Engine is up to temp it runs OK; but ounce they get started the Engine limps along until it is up to temp.

It might allow them to get some more years of use out of the Engine.

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84 300D, 82 Volvo 244Gl Diesel

Yes, I believe you are correct. I have a switch that I can use to hold the glow plugs on after starting. The new plugs stay hot longer so I have not had to hold them on.

When it gets cold it might be necessary to hold them though.

What models and tears are equipped with "after glow function"?

....just curious, for future references....

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'85 300D Turbo - CA Version

I can appreciate creative work-arounds, but is it really that onerous to have to carry a couple of spare retrofit pencil plugs?

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

Looking at the retrofit Pencil Glow Plugs it looks like when they are installed there is going to be more empty area/volume than before. That extra empty space decreases the compression ratio.
He had the Equipment, the skill and the willingness to spend the time to do the project.
The result eliminated the extra dead space using the retrofit Plugs would have created and if there is any hollow area where the Filiment/Loop is on the Stock Glow Plugs his mod might have even increased his compression ratio slightly from stock.

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84 300D, 82 Volvo 244Gl Diesel

You got it!

Well here are the volume numbers that I came up with during design.

Stock Loop Plug = 1.34947637cc

My Adapter and Pencil Plug = 1.63173543cc

Bosch Conversion Pencil Plug = Estimated @ .672387455cc

What is the thread size of the large plugs , 18x ? 1.5 ? . Your design pretty much imitates the plug layout in the small plug heads and glow plugs not only heat the intake charge air but also warm the head in cold weather to keep the engine running.
imagine ,if you will the heat soak from a glowplug into the heads casting when they are operating.

After glow relays are common on the OM602 powered cars . my 2004 Ssangyong MB`140D had afterglow. it made for instant starting and cleaner running .

I am not sure. I beleive it is after 1985 though.
There were some thread on it about 2 years ago.

I know my 84 300D does not have the Afterglow feature.

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84 300D, 82 Volvo 244Gl Diesel