Engine/Transmission (1994 - 1998) Injector Pop off Pressure

[Shrimpy]

Quick question for some of the gurus. I have a 1995 auto truck with a 160hp pump. No other mods, but I am getting ready to install a set of 215 hp injectors from a 1997. I am curious about pop off pressures.



I will be sending these injectors in to be cleaned and checked before installing and would like to know if the pop off pressure needs to be lowered or raised. I plan to install the 3k GSK at the same time, also possibly a #5 plate.



Injectors came out of a perfectly good running truck, with no known problems.



Am I worrying about something that will have little or no effect on how the truck runs???? My thinking is that I may need to lower the pressure they release at because of the smaller pump. Also what are the proper size copper washers to run with these????



Throw me a bone here guys... ... ... ..... What do you think.

 

[Cummins Corvette]

Your pump is not really "smaller". It has the same size plungers as the 215 pump. The pop off pressure should 260 bar as it says on the holder (outside of the injector). I would leave it right there if not a little higher. Be careful not to damage the tips.

 

[fortunate1]

215's

After cleaning off some soot, I put the 215 injectors from a '98 right into the holes left by the evicted stock 160's. No Problem with compatability; the truck loved 'em.

 

[HillCountrykid]

Jim, after you do all that work to your truck, you're going to need to dyno it in Dallas. See ya' later.



Brian

 

[Shrimpy]

Thanks for the info guys!!



Cummins Corv. - Is it the delivery valves that are smaller that causes the reduction in HP ratings or is it something else?? Just a curious question on my part.



Thanks for the info fortunate1. Hope mine likes them as well!!!!



Hey Brian, I bet we can find Speedworks easier this time .

I will probably dyno this time, just for the sake of checking things out.

 

[Cummins Corvette]

I recently spoke with Joe Donnelly about d valves. He said that they aren't necessary for high hp. The . 191s happen to help with the stumble at low rpms with the 160 and 180 pumps though. When I put 215s in my truck, it had some stumble and it already had the . 181 delivery valves in it. The reason for the lower hp is an ongoing mystery, but I believe that the bulk of the difference between the 180 and 215 pumps is the angle on the helix. The 160 pump also has different plunger and barrels (still 12 mm tho) and a different cam with less fill time. Good luck on ever getting any strait info on this site about any other differences in the pumps. Vendors are very tight lipped and I am convinced that no one here knows all of the differences.

Chris

 

[SlyBones]

While I have a great deal of respect for Joe's opinions, and would agree that 191 DV's may not add any top end HP on a truck thats already over 500 or 600 as it is, I love them in my truck. they worked great on my truck for improving lowend response and reducing turbo spoolup time and stuff like that. -- I am using them with a 180 pump and 215 injectors. I was not after more HP or had stumble problems. I wanted to reduce turbo lag. And 191's were recommended to me by the god of 12v's. And they work like a charm. Love them. You cant get me to take them out.

 

[Blakers]

Originally posted by Cummins Corvette

The pop off pressure should 260 bar as it says on the holder (outside of the injector).

What is this in PSI? My injector tester goes by PSI. Just in case I want to check one sometime.



Blake

 

[Dave Remillard]

Shrimpy

I see that the mods. you want to make are just what I have done to my rig (se sig. ). I have no regrets except one, and I intend to fix that soon. The problem I had started when I put the 215 injectors in . The 3K GSK and the 215 injectors and the #5 plate made for a bad stumble in mine. You may not experience this in yours however. I will be calling Mark at TST today to see about trading the #5 for a #4. I had talked to him on this subject before and that was his recommendation. Again, you may not have the problem like I have, but a quick call to Mark to discuss this subject may be worth considering. Regardless of the stumble, the mods. I have made, make the truck a kick in the *** to drive. Good luck.

 

[Shrimpy]

Thanks for the info no-strokin, I hope you get rid of the stumble.



I may rethink my plate choice after this good info. Thanks again guys.





Blakers, I have no idea!!!! PM TDR member Strick-9 (Chris Strickland), he knows quite a bit about this stuff. There are many more knowledgeable folks here and maybe they will chime in... .

 

[HoleshotHolset]

1 atmosphere = 14. 7psi

1 BAR = 1 atmosphere

260 BAR = 3822psi



Matt

 

[Blakers]

Originally posted by HoleshotHolset

1 atmosphere = 14. 7psi

1 BAR = 1 atmosphere

260 BAR = 3822psi



Matt

Matt, is that gauge pressure or absolute? Sorry, just kidding



Thanks a lot! I just never heard of injector pressure being stated in BARS - I guess that is one way of making it universal with American or metric.



Blake

 

[HoleshotHolset]

Those Germans (Bosch... and others... ) LOVE the Metric System..... I love it too, but it can get confusing growing up with the English version and dealing with the Metric stuff... .



A lot of German cars have oil pressure, turbo boost, various temps and so forth in Metric... . right on the gauges. Kinda cool... . but annoying at times.



Matt

 

[Blakers]

Originally posted by HoleshotHolset

Those Germans (Bosch... and others... ) LOVE the Metric System..... I love it too, but it can get confusing growing up with the English version and dealing with the Metric stuff... .

Even the Hercules diesels in the Cletracs in the 1930s has Bosch injectors and they were metric then.



Blake