I agree 100%. Walts description is completely accurate, that is exactly what the accumulator does. Since I have nothing add...I'll just say that. :-) Eric P. --- In DMCForum@xxxxxxxxxxxxxxx, id <ionicdesign@xxxx> wrote: > WOW! > best reason for the accumulator i heard so far, and the smartest > description. i am inpressed with you walt. > > mark > > Walter Coe wrote: > > > Not to negate anyone else's explanation, here is mine: > > > > The accumulator has 3 connections. Two of them take threaded fittings > > and > > the other is a hose barb. The threaded ports are connected together, > > i.e., > > they go to the same place. They could have made it just as well with > > one > > port and used an external T-fitting, but the way they did it requires > > less > > parts. > > > > The way the accumulator works is very similar to a bladder tank on a > > household well system or lawn sprinkler system. If you understand > > these > > then enough said, if not then forget I mentioned it. :-) > > > > I enjoy parables as does God in the bible, so I'll use one here to > > preach > > Bosch righteousness. Picture the accumulator as being a balloon on > > the side > > of a T-fitting tapped into the fuel supply line. As the fuel line > > reaches > > maximum pressure when you start the car from cold, the balloon > > inflates. If > > the fuel pressure fluctuates for any reason, the balloon expands or > > contracts to help regulate the pressure. In the case of a real > > accumulator, > > the balloon is a diaphragm with a spring behind it. If the diaphragm > > develops a leak, then it is plumbed back to the fuel tank via the low > > pressure return line. That is what the hose barb on the other end is > > for. > > > > When the accumulator is working properly, the spring & bladder > > maintains the > > fuel pressure in the system. This is especially important when the > > engine > > is hot and not running. The place where fuel enters the engine is hot > > > > enough to boil the fuel if it were at atmospheric pressure. By > > keeping it > > under pressure, this stops the fuel from boiling. Remember Boyle's > > Law from > > high school physics? If it did boil, there would be fuel vapor > > bubbles in > > the engine. And the fuel injectors are made to take liquid fuel -- > > not > > vapor. This is where the hot start problems come from. > > > > Cool eh? > > > > Walt > > > [Non-text portions of this message have been removed] ------------------------ Yahoo! Groups Sponsor ---------------------~--> New Yahoo! Mail Plus. More flexibility. More control. More power. Get POP access, more storage, more filters, and more. http://us.click.yahoo.com/Hcb0iA/P.iFAA/46VHAA/HliolB/TM ---------------------------------------------------------------------~-> To unsubscribe from this group, send an email to: DMCForum-unsubscribe@xxxxxxxxxxxxxxx Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
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