Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

 
Reply to this topicStart new topic
> 914/4 injector, Voltage
gifted914
post Apr 17 2013, 09:21 PM
Post #1


middleagecrisis
*

Group: Members
Posts: 30
Joined: 17-April 13
From: Australia / Brisbane
Member No.: 15,778
Region Association: Australia and New Zealand



G'day all.
Does anyone know the operating voltage and amps on the yellow injector fo the 1.7ltr.
I dont't thing it is straight 12 volts.

Peter
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
442nd914s
post Apr 18 2013, 05:22 PM
Post #2


Member
**

Group: Members
Posts: 139
Joined: 25-July 12
From: KC Suburb
Member No.: 14,718
Region Association: None



Here's some info iI found for you at Pelican's web site. Just remember a device will only pull/draw what is intended to use, no more no less. Example: A 10amp light WILL ONLY draw 10 amps from a 30 amp source

Pelican info:
As for opening the injectors with a battery, a 9V might work ok. Be aware, the issue here is what current you're passing through the injector.

You seem to have a D-Jet system, if so, the internal resistance of the injector is about 3 ohms. There is a 6 ohm (5 W rating) load resistor in the ECU that is in series with the injector. System voltage is about 13.5 V, which is dropped down to about 12.2 V through diode drops by the time it's applied to the injector. After the initial transient (due to the inductance of the injector coil) dies down, the current through the injector is about 12.2/9 = 1.35 A.

If you just apply 9V directly to the injector, the steady-state current is 9/3 = 3 A, or about 2.2 times the normal current load. Additionally, a 3 A load on a 9 V battery is probably far in excess of what it can supply, and that the actual applied voltage is considerably less (as would be the current). The battery will likely run down quickly.

From what I've heard (haven't tried it myself), the injector will open with fairly low voltage. High voltage is used in actual operation to open the injector more quickly for precise fuel metering. I've heard that one or two D cell batteries in series will open the injector, and will also keep the current low. You might want to give it a try. __________________ Brad Anders

Hope this helps.
P.s. I tried this mayself with a 6vdc 500ma old answer machine power supply/adapter with great success
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
r_towle
post Apr 18 2013, 05:26 PM
Post #3


Custom Member
***************

Group: Members
Posts: 24,705
Joined: 9-January 03
From: Taxachusetts
Member No.: 124
Region Association: North East States



A single AA battery will open and close an injector while troubleshooting.

If you are asking the question because you are building your own fuel injection, your answers are above.

Rich
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
reharvey
post Apr 18 2013, 06:52 PM
Post #4


Senior Member
***

Group: Members
Posts: 573
Joined: 16-July 08
From: N. E. Ohio
Member No.: 9,308
Region Association: North East States



The injectors fire using 3 volts. The cold start injector uses 12 volts. Put to much juice to them and they're toast. When I'm cleaning mine I open them using a DC train transformer. Set the transformer at 3 volts using a multimeter. Been doing this for years--works every time.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 



- Lo-Fi Version Time is now: 24th April 2025 - 09:33 AM