http://www.extrudehone.com/diesel/

I think it's a waste of time and money.

Injectors are replaced what, once during the live of the vehicle?
It would be a lot cheaper to just replace them afte 250,000 miles or so.

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1984 300SD Turbo Diesel 150,000 miles

OBK member #23

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They hone new nozzles, mostly.

Injectors are regular wear items, 100k miles.

This topic has been mentioned before but no one has taken up on it. I think its improvement on a IDI at 135BAR would be minimal.

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http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

Agreed the pressure/force wouldn't really gain much now if it was say 2000 or 3000 bar like on newer di u'd see alot more value for this.

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2004 Infiniti G35 3.5L 6mt Coupe 73K miles 25.6mpg ytd
2001 Green Audi TT 225 AWD Roadster 71K 6sp 30.9mpg >>STOLEN<<
1982 300D Turbo 231K 120hp? 28.1mpg YTD

Nozzle polishing?
You'll go blind.

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1982 300CD Petrol/Black Leather

I'm planning to do this when my diesel budget recovers. They say that some power gains are likely on IDI engines, but most of their experience is on DI engines.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

We need to try something. There is some power to be gained in the injection system without moving to larger plungers.

I'm usually eager to jump on things like this but I'll let somebody else go first on this one. I don't have the money to invest into it.