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#1
03-13-2009, 10:57 PM
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Prymeter readings
What should be the save operating temps and max exhaust gas temp for a 89 190D 2.5l (OM602) Going to buy Isspro pryometer with color gauge. They have a pre turbo and a after turbo model. Need to decide which one appropriate for a normally aspirated diesel. thank you
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1989 Arctic White 190D 2.5l auto w/400E Brakes and a  5spd waiting for me to install1977 280SL Euro M110/w 4spd 2001 Dodge Ram 2500 Quad cab 4x4 dyno 383hp / 916ft#'s 
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#2
03-13-2009, 11:10 PM
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I don't know what the NA ranges are, but the top safe temperature for a turbo engine is 1250*F
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$60 OM617 Blank Exhaust Flanges $110 OM606 Blank Exhaust Flanges No merc at the moment
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#3
03-14-2009, 01:09 AM
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Well, since the danger is melting pistons, and aluminum starts to melt at about 1250* F, the range for an NA and a Turbo are basically the same.
The difference between the turbo and non-turbo pyrometers is that the turbo drops the exhaust gas temps about 300* F. So if you are measuring temps AFTER the turbo you want to see a max of around 950* on your gauge - because on the other side of the turbo the gasses are about 300* F higher - or around 1250* F. Gravedigger, you'll want the one for PRE-TURBO applications since you are measuring EGTs directly - just like measuring them ahead of a turbo.
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1984 300 Coupe TurboDiesel Silver blue paint over navy blue interior 2nd owner & 2nd engine in an otherwise 99% original unmolested car ~210k miles on the clock 1986 Ford F250 4x4 Supercab Charcoal & blue two tone paint over burgundy interior Banks turbo, DRW, ZF-5 & SMF conversion 152k on the clock - actual mileage unknown
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