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|18th October 2009, 08:02||#17|
Join Date: Aug 2009
Location: New delhi
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The multijet is diesel technology, whilst MPFI is for petrol.The biggest difference is that : mulitjet is based on direct injection of fuel in the combustion chamber during the compression stroke.In MPFI, injectors are located in the upstream of intake manifold. In the intake stroke , as intake valve opens,injectors inject fuel and air + fuel mixture reaches in the combustion chamber, in the intake stroke thus in-direct injection.In comparison only air reaches in the combustion chamber of diesel multijet.
Someone here said, that just because there is a common rail, thus its enables them to identify it as diesel engine. Not, true i would say. I have seen an accumulator or rail in MPFi cars too.
|19th October 2009, 01:30||#18|
Join Date: Nov 2005
Thanked: 8 Times
"Multijet" derives its name from the multiple-jets that the piezo injectors deliver as explained before. These injectors spray the diesel AGAINST a very high pressure developed during the compression stroke of the cycle.
MPFI Injectors, on the other hand, inject during the intake stroke of the cycle. Further, as gasoline is more easily atomised than diesel, High pressure injection is not required.
However, GDI (Gasoline Direct Injection) technology is the next step in Gasoline engines. I'm not sure if it is available in any production vehicle. AVL had developed a prototype Engine named "Spectros" with GDI.
|19th October 2009, 16:09||#19|
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Join Date: May 2007
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|22nd October 2009, 08:34||#20|
Join Date: Oct 2009
Thanked: 40 Times
Dear All (Especially Kutappan),
Thanks so much for the classes on the subject i had doubts.
Would you also let me know on E F I - Electronic fuel Injection please.
|22nd October 2009, 08:48||#21|
Senior - BHPian
Join Date: Jan 2008
Thanked: 405 Times
PD, CDI, Multijet etc. are all extensively discussed in the thread "Pumpe-Duse diesel technology as against better known CRDi" at: http://www.team-bhp.com/forum/techni...ighlight=Pumpe (Pumpe-Duse diesel technology as against better known CRDi).
Note to mods: Perhaps this thread can be merged with the older one.
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