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On 5/9/2012 9:41 PM, luissenye wrote:
I know I asked this before, but I can't find that post
I'm reversing the engine harness, do I have to keep the injectors on
the same order?
Okay, how do I write this ? It is difficult to correct a long held belief when you have had no reason to believe otherwise, but in the interests of group information I feel I cannot ignore Scott's post about injector sequencing.
Scott is a long time tech and from what I can gather very diligent .
Some time ago, although not that long, I learned a lot about injection systems and the design of same.
Briefly it boils down to this....an engine does not care what sequence injectors fire or if they inject one shot per 1 revolution ( half total volume.) or if they fire a full quantity at one time ....or if 20 injectors fire on a 2 cylinder motor or 2 injectors fire on a V8 motor .....or how much in advance of the intake valve opening or as the valve opens, as long as the fuel quantity is what is required.
It tested not to matter if they are batch fired, pair fired or singly/sequentially fired and also tested it does not matter which way injectors fire or when.( Squirting up-stream has it's advantages.)
Take for instance the CIS and later CIS-e Bosch fuel system. The injectors on this system design are squirting fuel all the time the engine needs fuel.
Sequential systems : The reason is to reduce the fuel pressure drop that results from firing all at once.( Batch Firing.)
Sequential does however make for very slightly smoother operation at idle with lean burn motors.
The straight 6, V8's and V6's of Ford, Dodge and GM used two injectors in a throttle body that squirted constantly..don't forget all carb's are 'injecting ' fuel all the time.
So having your sequential system hooked up just like the factory designed it is good, but not mandatory just as long as they fire .
As long as the motor gets the fuel it need it care not a whit about when it's delivered..or whether it's in bulk or timed.
If there is any papers out there that have more info on this I hope you'll bring them to my attention. So your Subaru motor will be happy with the system firing 'backwards' .
...and Tom? I hope this is not 'off topic'.
regards
dk
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