From owner-diesel-benz-digest@digest.net Thu Jul 8 21:34:21 2010 From: diesel-benz-digest diesel-benz-digest Friday, July 9 2010 Volume 01 : Number 3300 Forum for Discussion of Diesel Mercedes Benz Automobiles Derick Amburgey Digest Coordinator Contents: [db] very nice parking system [db] WAS: Tranny Filter, Now coolant filter >> IS: someone is all wet. :) Diesel Benz Digest Home Page: http://www.digest.net/diesel-benz/ Send submissions to diesel-benz-digest@digest.net Send administrative requests to diesel-benz-digest-request@digest.net To unsubscribe, include the word unsubscribe by itself in the body of the message, unless you are sending the request from a different address than the one that appears on the list. Include the word help in a message to stag-digest-request to get a list of other majordomo commands. ---------------------------------------------------------------------- Date: Mon, 05 Jul 2010 10:09:11 -0700 From: john Subject: [db] very nice parking system http://www.woehr.de/en/projekte/budapest_m730/index.htm - -- ----- - ------------------------------------------------------------------------ Snohomish, Washington -o|||||o- where Jeeps don't rust, they mold http://AMSOIL.com/redirect.cgi?zo=283461 si vis pacem, para bellum http://johnmeister.com http://wagoneers.com http://fotomeister.us - ------------------------------------------------------------------------ ------------------------------ Date: Thu, 08 Jul 2010 20:37:21 -0700 From: john Subject: [db] WAS: Tranny Filter, Now coolant filter >> IS: someone is all wet. :) On 7/8/2010 1:01 PM, Jim Blair wrote: > It happens more in diesels because the high compression and heat polarize the > ions in the antifreeze. Jim, I would like to be the first to politely and in a friendly way, say you're all wet on this. :) 1) the fact that Diesels have higher compression has no bearing on the cooling system as the compression is contained in the cylinders... 2) Diesels actually run cooler than gas engines because the fuel is more completely burned and the energy converted to movement... that's why I Diesel engine can sit idling for hours without overheating while a gas engine will. 3) heat does not polarize the ions in antifreeze... (I just spent a few minutes googling this just to be sure they hadn't changed the laws of chemistry since I last studied it...) 4) You MAY have been thinking about bimetallic corrosion and the use of distilled water as noted here: *Tap water, which varies dramatically in areas, contains ionic species of calcium, magnesium and chlorine. If there are any significant ions present, you can generate bimetallic corrosion within the metallic components of the radiator. Distilled water is a poor ionic conductor (ions removed), as is the components in the antifreeze. So bimetallic corrosion is minimized (weaker electrolyte). Most antifreeze will have additives in it to reduce the corrosion. If you flush the coolant at the recommended intervals (even with tap water), you are unlikely to have any problems.* (from: http://www.ch250.net/techtips/28.htm ) 5) The OTHER, and most likely possibility of what you were thinking about, or overheard, is the issue of CAVITATION in Diesel engines... to prevent this from happening heavy equipment will often use "water-wetter" agents. It was suggested to me at the Ford Tractor dealership on my Ford 1900, a very cool three cylinder 4x4 Diesel tractor that I rebuilt from service on a dairy farm, but that's another bull story and it was full of crap... Anyway, those additives help the coolant avoid bubbling that can cause erosion along the cylinder walls. This isn't a very common problem with modern Diesels... I've been driving all kinds of Diesels for over 40 years and never seen it, only heard about it from some old-timers. Like the kind working on heavy equipment or tractors... so, I googled again: http://www.thedieselstop.com/contents/getitems.php3?Cavitation%20Analysis What is cavitation? One of our diesel experts offered this explanation: Cavitation is a localized low pressure zone that forms adjacent to the outer wall of the cylinder. It is caused by by the flexing of the cylinder wall due to the high cylinder pressures experienced in diesel engine ignition. Gasoline engines don't typically get this failure mode due to lower cylinder pressures during ignition. Basically what happens is the cylinder wall quickly expands due to ignition then returns to its original geometry. This expansion of the cylinder wall is more pronounced as you increase the demand for power. Bascially when you increase your demand for power you are pumping more fuel into the cylinder. If you have a turbo charged unit you are also increasing air charge. This increase in fuel and air causes a more violent ignition which further increases cylinder pressures and thus increases the flexing of the cylinder wall. This fast cylinder wall movement causes a low pressure zone to be created in the coolant adjacent to the cylinder wall. When this pressure zone drops below the vapor pressure point (temperature, coolant ratio, and additive dependant) a vapor bubble is formed. When this low pressure zone returns to a high pressure zone, the vapor bubble collapses, causing an implosion, or pitting phenomena on the cylinder wall (like hitting the surface with a microscopic ball peen hammer). If left unchecked, it will eventually eat all the way through the cylinder wall. The next question is probably /What do I do to prevent cavitation?/ The answer is simple, add the appropriate coolant additive at 15,000 mile intervals and perform a complete coolant change every 30,000. By following these procedures, you'll never have a coolant-related failure. The additives include Ford's FW-16 (replacement for the older FW-15), Fleetguard's DCA4, Penray's Pencool, and others. A new alternative is to use Cat and Fleetguard's new extended life coolant. It is impregnated with the proper additive and mixed to the proper antifreeze/water combination at the factory. You simply pour it in. ===================== So, I hope this clears up the topic... yes gear oil with additive for limited slip smells horrible, but you don't have to smell it because AMSOIL synthetic gear lube already has the necessary additives... and that's no bull. As far as filtering coolant, not a bad idea for a gas engine... And I will stand by my comments about heating the remote filter to coolant temperatures on an AT with an external cooler... some heat is necessary to remove moisture from the ATF... going back to lurk mode and waiting for comcast to uncork my network drop so I can start using my own mail server on wagoneers.com again... being forced to use thunderbird on my pc... or reply via a blackberry... Saturday... :) later y'all. john - -- ----- - ------------------------------------------------------------------------ Snohomish, Washington -o|||||o- where Jeeps don't rust, they mold http://AMSOIL.com/redirect.cgi?zo=283461 si vis pacem, para bellum http://johnmeister.com http://wagoneers.com http://fotomeister.us - ------------------------------------------------------------------------ ------------------------------ End of diesel-benz-digest V1 #3300 **********************************