Fuel Pressure injectors type EV1 vs. EV6 - Third Generation F-Body Message Boards

Cobra289 · 06-20-2007, 08:25 AM

Hi,

I doubt if my injectors 24# will hold the HP of the engine at WOT, therefore I did some search and read some nice threads.

There is a lot discussions done regarding the FP of the injectors used.
Also I have read several threads regarding Static Injectors and the BPW.
Lost of discussions about the Injector Duty Cycle% and the BSFC.
So I am forming my opinion step by step.

But I found something interesting from Bosh Motor Sports Department that I want to share.
Read the PDF file and probably you will find some explanations.

Watch what they say about the "Working pressure" it should be according the design and not the rating pressure.

Here is an extraction of the behavior of adding Fuel Pressure to our standard EV1 type of injectors.

====================================================
ACCORDING TO BOSCH
Effects of Fuel Pressure on Pintle Type Fuel Injectors.
Fuel velocity through a pintle type fuel injector [type code EV 1] can dramatically
affect its ability to atomise fuel. The profile of the pintle used in a
fuel injector has a direct relationship to the operating pressure it is designed
to operate under. Whilst Bosch produce various fuel injectors that may flow
the same amount of fuel at a given specification, the system operating pressure
will influence the pintle profile. Correct pressure will result in a well
atomised spray, while insufficient pressure will result in a “hosing” effect.
Excessive pressure will result in either “hosing” or a spray angle that is too
large for the targeted area dependent on the pintle profile.
The consequence of excessive fuel pressure on a pintle type injector may
well be that as the pressure is increased the mixture values of the engine
may appear to get leaner. This is of course not the case, but the fuel being
injected is no longer atomised and is entering the cylinder as a liquid mass.
This will typically cause the Hydrocarbon [HC] values to rise due to the raw
fuel exiting the cylinder, and the Carbon Monoxide [CO] to drop due to
insufficient combustion.
Later design fuel injectors [type code EV 6] use “director plate” multi-orifice
technology to better atomise fuel across various operating pressures.
These injectors allow more flexibility in relation to operating pressures without
compromising spray efficiency or fuel atomisation.
=============================================

You can download the PDF file at this link.
http://www.donostia.demon.nl/fuelinjectors.pdf

I need to check what is involved by the installation of the EV6 type injectors, I think that they will fit, they have just an smaller body.

If someone has experiences with the installation and performance please let me know.
I like the "0 280 156 012" that are 41# = 310 g/min. but need to set the AFPR at 55 PSI.
What do you think from my selection?

It is for a 350 cid HSR with AFR heads, estimated 400+ HP

Best regards,
Cobra289