Re: Electronic to Mechanical Pump

Posted by jdemaris on April 04, 2006 at 11:32:44 from (69.67.229.78):

In Reply to: Re: Electronic to Mechanical Pump posted by RodInNS on April 04, 2006 at 10:56:58:

I can't speak from personal experience with the Cummins engines - I don't own any. Just know a few people that do. But, I doubt the differences in starting have anything to do with timing. That would not make sense. Electric or mechanical, establishing optimum static timing for starting purposes is easy to do. With many pumps with slotted mounts where they bolt, you can just rotate the pump housing to advance static timing. Deere Company had us doing it ad nauseum with many poor starting diesels that came out with the 40 series ag. tractors. Ultimately, it made no - or very little difference. Our Volkswagen had a timing-advance control by the steering column - for cold starting. Again, with the Cummins - I don't know if all the older engines were poor starters, or just some. With the GM 6.2 and 6.5s, some are great starters, and some lousy - and it has nothing to do with timing, fuel delivery amount or glow-plug timing. It's all in the basic fundementals of engine assembly - e.g. how high the piston standout is above block-deck, combustion chamber size in the piston, valve head recess, etc. My 82 Chevy 6.2 will start when it's 20 degrees F with little effort. My 83 will barely start at 60 degrees F without some jerking around and excess glow-plugging. Both run great, once running. My 85 Ford with the IH 6.9 is the best of the bunch, and I've started it a few times at 0 degrees without plugging in the heater and it fires right up (after the glow plugs cycle).
In regard to my wife's 91 Jetta as compared to my son's - it's not the driving habits that make the difference - we've used his car - and he's used ours. He bought his after being impressed with our little junker. We borrowed his to see if we liked it better. His does have a little more power, and handles better, but it's hardly noticeable. I read through a lot of Volkswagen technical data for their newer designs - and the main thing that has happened is - they are trying to "dumb down" diesels for Americans - and make them start, sound, and run like gas engines. At the same time, they also have to meet more stringent emissions requirements. That is why the mileage is not as good with the newer ones in the US. Overseas it's different. Many comparible diesel cars get much better fuel mileage in Europe.
As I understand it, General Motors gave up on their 6.5 diesel because it became to costly to keep up with emission's standards without sacrificing fuel mileage and reliability. So, they dropped it, and let Isuzu make their Powermax diesel instead.
It is likely that newer diesels are more consistent in their manufacturing processes - so you don't find some that start well and others that don't (unless something goes wrong). Also, just by the nature of design, a direct-injected diesel if built right will be a better (or faster) starter than an IDI down to a certain temperature. Below that cold thresh-hold, an IDI with properly working glow-plugs will outstart the DI engine - not counting the use of block-heaters.

Replies:

• Re: Electronic to Mechanical Pump RodInNS 15:17:47 04/04/06 (1)
  • Re: Electronic to Mechanical Pump jdemaris 20:08:02 04/04/06 (0)

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