12 Valve 2nd Gen Dodge Cummins 94-98 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps

Timing in inches?? Help lol

Thread Tools
 
Search this Thread
 
  #1  
Old 05-10-2015, 08:06 AM
Stox5225's Avatar
Diesel Fan
Thread Starter
Join Date: Aug 2014
Location: Spring Lake, NC
Posts: 14
Likes: 0
Received 0 Likes on 0 Posts
Default Timing in inches?? Help lol

Alright, so I have a 97 12V 5 speed. Modded the IP for fuel plate contact, #10 fuel plate about halfway up, Banks Twin Ram intake, Banks Quick Turbo, 50+ HP injectors, ARP head studs and EGT and Boost gauges ... Just replaced the IP because some bolt holes stripped out of the AFC when I was modding it . Figured I'd jump the timing to 16.5* while it was all apart. Only thing is the dial indicator I got is in inches. I've read up a lot on timing since I got it and found a lot of links that helped, but I'm still second guessing myself. Here's what I did:

-After I installed the IP back on, I tightened the nut down so I could time the pump.

-Ensured the timing pin was in on the IP and installed the indicator. It read .389. The chart it gave me said it should be at .200. So what I did was I did the math between what it says 13.5* is supposed to be (.200) and what 16.5* said (.222). So my jump is supposed to be .022 inches.

-I pulled the timing pin out of the IP, put the barring tool in and had my wife crank the wrench clockwise as per the instructions (they were vague. All is said was crank the motor clockwise, not sure it that was the correct direction or not). This moved the indicator COUNTERCLOCKWISE moving the indicator to .367.

-After that I popped the nut back off and moved the engine to TDC using the dimple on the back of the cam gear. Reading dropped a little (less than 16.5*), so I just kept it.

IS THIS CORRECT??? I need a little reassurance here

Also I don't push the truck hard. Looking for it to run better and get better fuel economy. I do plan on a 3GSK kit and 60lb valve springs this summer.
 
  #2  
Old 05-10-2015, 10:44 AM
JBearSVT's Avatar
Diesel Bomber
Join Date: Oct 2010
Location: New England
Posts: 1,325
Likes: 0
Received 59 Likes on 58 Posts
Default

I don't know about any of that, I paid someone else to do it. I'm actually hung up on... you seriously replaced an IP over stripped AFC bolt holes? Helicoils man. They're like, forty buck on Amazon.
 
  #3  
Old 05-10-2015, 04:59 PM
Stox5225's Avatar
Diesel Fan
Thread Starter
Join Date: Aug 2014
Location: Spring Lake, NC
Posts: 14
Likes: 0
Received 0 Likes on 0 Posts
Default

Regardless of how I got to timing my pump, I still did it ... I was looking for help on timing; not hindsight ...

And for anyone else that owns an inch indicator ... I did it correctly. She fired right up and way quicker than at the stock 13.5*. Once I fix the drum brakes, I'll be taking her for a test drive this week.
 
  #4  
Old 05-11-2015, 06:28 PM
JBearSVT's Avatar
Diesel Bomber
Join Date: Oct 2010
Location: New England
Posts: 1,325
Likes: 0
Received 59 Likes on 58 Posts
Default

What was quicker exactly? Because you really don't get any power from timing the pump.
 
  #5  
Old 05-13-2015, 10:25 AM
patch164's Avatar
Diesel Fan
Join Date: May 2015
Location: South Texas
Posts: 11
Likes: 0
Received 0 Likes on 0 Posts
Default

I did the same thing. I bumped mine to 20* tho and can't tell a difference in power. It still starts right away too. Not too sure if its correct. Ima set it back to stock and try it again. Surely you should be able to see a difference in power.
 
  #6  
Old 05-13-2015, 11:29 AM
94 12valve's Avatar
Diesel Bomber
Join Date: Jan 2009
Location: Pylesville, Maryland
Posts: 3,504
Received 157 Likes on 142 Posts
Default

Originally Posted by Stox5225
Regardless of how I got to timing my pump, I still did it ... I was looking for help on timing; not hindsight ...

And for anyone else that owns an inch indicator ... I did it correctly. She fired right up and way quicker than at the stock 13.5*. Once I fix the drum brakes, I'll be taking her for a test drive this week.
If I'm reading and following your first post correctly you lost .022" of plunger lift than returned the motor to TDC and bolted the gear back on?

if so you retarted your timing instead of advancing it. You are looking for more plunger lift at TDC not less.
 
  #7  
Old 05-13-2015, 12:58 PM
patch164's Avatar
Diesel Fan
Join Date: May 2015
Location: South Texas
Posts: 11
Likes: 0
Received 0 Likes on 0 Posts
Default

I did the math the same way stox5225 which for mine was 12.5* stock which was .2244" I was going to 20* which was.2853 subtracted the difference which was .059" I zeroed out my gauge and moved the big needle to .059" which I thought should be 20*. Popped the gear off and turned it back to tdc put the gear back on. So is that at 20* or did I do something wrong?
 
  #8  
Old 05-13-2015, 05:41 PM
JBearSVT's Avatar
Diesel Bomber
Join Date: Oct 2010
Location: New England
Posts: 1,325
Likes: 0
Received 59 Likes on 58 Posts
Default

You will not gain power by bumping injector pump timing. If you think you feel a power difference, you either have the most precision calibrated *** or the wildest imagination on the planet.
 
  #9  
Old 05-13-2015, 06:39 PM
94 12valve's Avatar
Diesel Bomber
Join Date: Jan 2009
Location: Pylesville, Maryland
Posts: 3,504
Received 157 Likes on 142 Posts
Default

Originally Posted by patch164
I did the math the same way stox5225 which for mine was 12.5* stock which was .2244" I was going to 20* which was.2853 subtracted the difference which was .059" I zeroed out my gauge and moved the big needle to .059" which I thought should be 20*. Popped the gear off and turned it back to tdc put the gear back on. So is that at 20* or did I do something wrong?
This sounds correct to me as you increased your plunger lift at TDC.

Originally Posted by JBearSVT
You will not gain power by bumping injector pump timing. If you think you feel a power difference, you either have the most precision calibrated *** or the wildest imagination on the planet.
I could not disagree more with this statement
 
  #10  
Old 05-13-2015, 06:44 PM
JBearSVT's Avatar
Diesel Bomber
Join Date: Oct 2010
Location: New England
Posts: 1,325
Likes: 0
Received 59 Likes on 58 Posts
Default

You gained power from nothing more than bumping timing? I'd like to see that.
 


Quick Reply: Timing in inches?? Help lol



All times are GMT -5. The time now is 10:09 PM.