2.5na, normal smoking - Defender Source
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  #1  
Old January 6th, 2016, 10:47 AM
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wayne p
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2.5na, normal smoking

Morning and Happy New Year All,


Question for those who have much more diesel experience than me: What is the normal smoke pattern of a healthy and properly tuned/timed 2.5na? Lots of opinions out there, but I have some trust in this group.


My engine has ~5K miles since overhaul, starts, runs and sounds great. My 90 cruises well at 65-70 on the level, but I usually stick to 65 as that seems to be its sweet spot.


It produces grey smoke on start & warm-up, which seems normal. It produces minimal smoke, only visible at night in following lights, during normal driving and a good puff of black on sharp acceleration and at wide open throttle.


When it is cool (bottom 1/4 of the gauge), if I hold the throttle open say 1/3, it will skip and produce puffs of grey, smelly unburned fuel smoke. It does not do this once fully warmed. This one has me wondering; is this a normal warm-up trait or a timing issue?


I know you can't compare this to modern diesels, and vividly remember riding behind smoky buses and trucks in the 70's so I think my engine is probably healthy and timed well. Or I need to teach myself how to time the 2.5.


What say ye? Thanks.
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  #2  
Old January 6th, 2016, 11:11 AM
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sounds like one injector isn't popping @ the same pressure as the other three when cold
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Old January 6th, 2016, 11:21 AM
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Great description btw. I owned a 2.5 for three years and it operated exactly like you've described. I love the simplicity. Only difference was my sweet spot was more like 52. I could push it to 65 but it didn't feel or sound right.
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  #4  
Old January 9th, 2016, 03:46 PM
Greg S
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Hm?
65-70? 52?
I think the OP must be talking in KPH.
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Old January 9th, 2016, 04:27 PM
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Quote:
Originally Posted by Uncle Douglas View Post
sounds like one injector isn't popping @ the same pressure as the other three when cold


X2....
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  #6  
Old January 9th, 2016, 10:13 PM
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wayne p
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Quote:
Originally Posted by Greg S View Post
Hm?
65-70? 52?
I think the OP must be talking in KPH.
No, actual mph....I've seen a needles width or so above 110kph indicated on a long, long level stretch but it's not happy there. Typically I cruise at 100 or so. Of course, any meaningful grade has me at 85kph in a heartbeat. These are indicated speeds on a 30yr old Smiths speedo though and I am certainly not passing too many cars...

Thanks for the thoughts on the injector. Given how well it runs I am inclined to keep an eye on it and attack it if it gets worse or starts to miss when warm. Any danger in this plan?
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Old January 9th, 2016, 10:35 PM
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With a 1.4 box you should happily be able to do 110 km/h actual on the flats at sea level all day long.
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  #8  
Old January 10th, 2016, 12:25 AM
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Quote:
Originally Posted by Red90 View Post
With a 1.4 box you should happily be able to do 110 km/h actual on the flats at sea level all day long.
Yeah, logically I know that, but I just can't seem to get over the feeling that extended driving with that much pedal is asking too much of the NA lump...
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