Stock 6.7 Injectors will get the job done - Ford Powerstroke Diesel Forum
6.7 Performance Parts Discussion 6.7 Performance Parts Discussion

Powerstroke.org is the premier Diesel Truck Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 06-30-2013, 05:54 PM
Banned
 

Join Date: Mar 2013
Location: 210a Maple Ave
Posts: 799
Thanks: 1
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
Stock 6.7 Injectors will get the job done

I will be the first to admit, when tuning first came out for the 6.7 I was totally shocked to see the amount of fuel these injectors can deliver.
In fact I had to apologize to Bentley.

Since then here is what I have concluded.
This is all just my opinion but I did use good numbers where possible.

I consider 3200 pulse width a maximum number.
At 4500 rpm and 32 degrees of timing this is injecting fuel about 50/50 before and after top dead center.

In some engines that longer on time has a tendency to heat cycle and crack the pistons at the lip.

The 6.7 pistons are an open bowl design (no lip). In my opinion this piston bowl design works well in a higher pulse width application.

A stock cp4 delivers 180 lph of fuel at 30000 psi.
A stock injector delivers 22 lph of fuel at 1200 pulse and 30000 psi.
At 2200 pulse the injector will deliver 45 lph of fuel.
This is the area the injection amount that in theory will start to drain rail with 2 cp4 pumps.

The duramax lbz cp3 pump will deliver 230 lph at 26000 psi.
A cp3 /cp4 dual setup will deliver some additional fuel.

The fuel should still top out at about 2800- 3000 pulse width.

Consider that lower pressure in the injector will slow the operation of the injector down. That means more of the on time will be used to operate the injector versus deliver fuel.

That being said with the cp3 adding volume to the rail the cp4 should still be able to hold the pressure at 30000.

It would seem it would take dual 55% over cp4 pumps to deliver sufficient fuel to the injectors at a 3200 micro second on time.

The information in this post is by no means absolute facts.
These are just some rough figures I put together so that we could get a discussion moving forward.
Please if anyone has more precise figures add them in.

I started looking at this a while ago when a customers sent in a set of 6.7 injectors to take 45% over. We did them and then flowed them on the test bench. We had to turn the pulse on the test bench down because at standard test specs they maxed out the machine.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 06-30-2013, 06:54 PM
Compression Ignition Addict
 

Join Date: Jun 2010
Posts: 176
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Are you sootboy from powerstokearmy or did you just copy and paste some of his post?
Reply With Quote Quick reply to this message
  #3  
Old 06-30-2013, 06:58 PM
Banned
 

Join Date: Mar 2013
Location: 210a Maple Ave
Posts: 799
Thanks: 1
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
same user
It was my post there and here
Reply With Quote Quick reply to this message
  #4  
Old 07-19-2013, 05:53 AM
Powerstroke.org Rookie
 

Join Date: Apr 2013
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Thanks for sharing!
Reply With Quote Quick reply to this message
  #5  
Old 07-19-2013, 07:30 AM
Compression Ignition Addict
 

Join Date: Aug 2011
Posts: 4,715
Thanks: 49
Thanked 42 Times in 42 Posts
Feedback Score: 0 reviews
Quote:
Originally Posted by cfd_shop View Post
I will be the first to admit, when tuning first came out for the 6.7 I was totally shocked to see the amount of fuel these injectors can deliver.
In fact I had to apologize to Bentley.

Since then here is what I have concluded.
This is all just my opinion but I did use good numbers where possible.

I consider 3200 pulse width a maximum number.
At 4500 rpm and 32 degrees of timing this is injecting fuel about 50/50 before and after top dead center.

In some engines that longer on time has a tendency to heat cycle and crack the pistons at the lip.

The 6.7 pistons are an open bowl design (no lip). In my opinion this piston bowl design works well in a higher pulse width application.

A stock cp4 delivers 180 lph of fuel at 30000 psi.
A stock injector delivers 22 lph of fuel at 1200 pulse and 30000 psi.
At 2200 pulse the injector will deliver 45 lph of fuel.
This is the area the injection amount that in theory will start to drain rail with 2 cp4 pumps.

The duramax lbz cp3 pump will deliver 230 lph at 26000 psi.
A cp3 /cp4 dual setup will deliver some additional fuel.

The fuel should still top out at about 2800- 3000 pulse width.

Consider that lower pressure in the injector will slow the operation of the injector down. That means more of the on time will be used to operate the injector versus deliver fuel.

That being said with the cp3 adding volume to the rail the cp4 should still be able to hold the pressure at 30000.

It would seem it would take dual 55% over cp4 pumps to deliver sufficient fuel to the injectors at a 3200 micro second on time.

The information in this post is by no means absolute facts.
These are just some rough figures I put together so that we could get a discussion moving forward.
Please if anyone has more precise figures add them in.

I started looking at this a while ago when a customers sent in a set of 6.7 injectors to take 45% over. We did them and then flowed them on the test bench. We had to turn the pulse on the test bench down because at standard test specs they maxed out the machine.
It might just be your opinion, but as always, n appreciated one.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -8. The time now is 07:34 PM.


Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.1
Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.

vB.Sponsors