Dual injector tech ??

vibhu_f430 · 27th December 2008, 23:37

Hay guys ,

Are there any cars in production which use 2 injectors per cylinder(like twin spark IDSI) in DI diesel engine ?
If there are 2 injectors, then there would be enough place in the head only for 2 valves per cylinder.. But instead of 1 injector spraying fuel repeatedly over a period of a few microsec, the 2 injectors can alternatively spray fuel into the combustion chamber which could result in

1) Better combustion ?
2) Better or worse NVH ?

Just a taught !

.anshuman · 28th December 2008, 15:09

There are multiple injections per stroke in some diesel engines but ive never heard of dual injectors.

jat · 29th December 2008, 19:31

Bigger engines have multiple injectors, but AFAIK, there is no multiple injectors for car diesel engines.

There isn't enough space for the current size injectors to fit in.

jalsa777 · 30th December 2008, 00:44

number of injectors wont affect the number of valves, cause injectors are attached to the runners or at plenum.

There is a tech where there is an injector on each runner and also an injector on the manifold. This system facilitates better mixing of fuel and air, but with newer injectors and port designs, this advantage has been reduced.

I dont know which cars use this or even if any car at all uses it, but i have read about it.

The only advantage i can see of multiple injectors per cylinder is that the duty cycle (amount of time injector is open) for each injector will reduce.

27th December 2008, 23:37	#1
vibhu_f430 BHPian Join Date: Nov 2006 Location: chennai Posts: 205 Thanked: 87 Times	Dual injector tech ?? Hay guys , Are there any cars in production which use 2 injectors per cylinder(like twin spark IDSI) in DI diesel engine ? If there are 2 injectors, then there would be enough place in the head only for 2 valves per cylinder.. But instead of 1 injector spraying fuel repeatedly over a period of a few microsec, the 2 injectors can alternatively spray fuel into the combustion chamber which could result in 1) Better combustion ? 2) Better or worse NVH ? Just a taught !
	() Thanks

28th December 2008, 15:09	#2
.anshuman Distinguished - BHPian Join Date: Dec 2004 Location: Good-Gaon Posts: 7,763 Thanked: 11,064 Times View My Garage	There are multiple injections per stroke in some diesel engines but ive never heard of dual injectors.
	() Thanks

29th December 2008, 19:31	#3
jat BHPian Join Date: Dec 2005 Location: SINGAPORE Posts: 265 Thanked: 7 Times	Bigger engines have multiple injectors, but AFAIK, there is no multiple injectors for car diesel engines. There isn't enough space for the current size injectors to fit in.
	() Thanks

30th December 2008, 00:44	#4
jalsa777 BHPian Join Date: May 2006 Location: Mumbai Posts: 732 Thanked: 1,678 Times	number of injectors wont affect the number of valves, cause injectors are attached to the runners or at plenum. There is a tech where there is an injector on each runner and also an injector on the manifold. This system facilitates better mixing of fuel and air, but with newer injectors and port designs, this advantage has been reduced. I dont know which cars use this or even if any car at all uses it, but i have read about it. The only advantage i can see of multiple injectors per cylinder is that the duty cycle (amount of time injector is open) for each injector will reduce.
	() Thanks