My 85's with pencil type glowplugs start a lot better in the cold than the 77 with loop plugs. Since this is the only significant difference I can detect, I am wondering if I convert the 77 to pencil type plugs, it will start better in the cold (below about 8 degrees). What does everyone think? Anyone done the conversion and noticed better cold starts? Or is the difference so subtle as to be not worth the work? Is the difference just a matter of not waiting as long to glow or is it a better start? Can anyone give a theoretical explanation of the advantages of the 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