arveetek
11-22-2005, 07:29
It's finally started getting cooler here in the Ozarks. I've been wondering if I would be able to tell if the new lower-compression engine would have any trouble starting in that cooler weather, and now I can begin to find out.
What I have been doing is comparing how my rebuilt 6.2L compares to my stock 6.5L. The 6.2L has around 4,000 miles, and the 6.5L has around 165,000 miles. Both are running 60G glow plugs. The 6.2L glows for about 12 seconds with a home made controller. The 6.5L glows for about 7 seconds with the stock controller.
Both engines start fine at 30 degrees F. However, the 6.2L belches a rather large cloud of blue/white smoke, which clears up pretty quickly. The 6.5L starts with just a barely detectable puff of smoke which vanihes even quicker. The 6.2L will spit and sputter for a few moments, and then smooth out. The 6.5L runs smooth as silk.
While the 6.2L starts fine, I can definitely tell the 6.5L starts easier with less smoke, less glow time, and smaller batteries. The only conclusion I can draw is that the 19.75:1 compression doesn't fire up as well as the stock 21:1 does. It doesn't seem like much, but I guess it does make a difference.
In warm weather, though, the mechanically-injected 6.2L fires up faster than the electronic 6.5L. Just one quick turn of the crank, and the 6.2L is running. The 6.5L has to spin over a few times for the computer to get up to speed on what's happening. The 6.2L's advantage has disappeared with the onset of cooler weather.
However, my hot-rod 6.2L will run circles around the stock 6.5L! :D There's no comparing the two as far as power goes. At the same time, though, the stock 6.5L runs much, much smoother than the 6.2L. I'm still not sure about that. Even though the 6.2L has the timing gears and is new from top to bottom, the stock 6.5L with timing chain runs even smoother, and is much more pleasant to drive on long distances. Perhaps that's an advantage to the DS4 pump system?
Just thought I'd share my experiences so far. I'll have to see what happens when it gets really cold this winter!
Casey
What I have been doing is comparing how my rebuilt 6.2L compares to my stock 6.5L. The 6.2L has around 4,000 miles, and the 6.5L has around 165,000 miles. Both are running 60G glow plugs. The 6.2L glows for about 12 seconds with a home made controller. The 6.5L glows for about 7 seconds with the stock controller.
Both engines start fine at 30 degrees F. However, the 6.2L belches a rather large cloud of blue/white smoke, which clears up pretty quickly. The 6.5L starts with just a barely detectable puff of smoke which vanihes even quicker. The 6.2L will spit and sputter for a few moments, and then smooth out. The 6.5L runs smooth as silk.
While the 6.2L starts fine, I can definitely tell the 6.5L starts easier with less smoke, less glow time, and smaller batteries. The only conclusion I can draw is that the 19.75:1 compression doesn't fire up as well as the stock 21:1 does. It doesn't seem like much, but I guess it does make a difference.
In warm weather, though, the mechanically-injected 6.2L fires up faster than the electronic 6.5L. Just one quick turn of the crank, and the 6.2L is running. The 6.5L has to spin over a few times for the computer to get up to speed on what's happening. The 6.2L's advantage has disappeared with the onset of cooler weather.
However, my hot-rod 6.2L will run circles around the stock 6.5L! :D There's no comparing the two as far as power goes. At the same time, though, the stock 6.5L runs much, much smoother than the 6.2L. I'm still not sure about that. Even though the 6.2L has the timing gears and is new from top to bottom, the stock 6.5L with timing chain runs even smoother, and is much more pleasant to drive on long distances. Perhaps that's an advantage to the DS4 pump system?
Just thought I'd share my experiences so far. I'll have to see what happens when it gets really cold this winter!
Casey