Engine/Transmission (1994 - 1998) Whats the need in HD Valve Springs

[AWard]

What would be a reason for having Heavy Duty valve springs? I know they might be important for if you have an exhaust brake, But what other reasons might you use them?

 

[GAmes]

a 3 or 4 gsk.

 

[WDimig]

well the very basic reason, is to keep the valves from floating, during higher than stock rpm (over 3k rpm), and or when the exhaust brake is being used to keep the valves seated. the stock springs can start to float at around 3200 rpm, with the 60lb. springs, i have seen 4k RPM, many times. they are a necessity so you dont cause damage to your valve train, and or even piston damage.



wes



edit: if your planning on doing a 3 or 4k govenor spring kit, you need to do both intake, and exhaust valve springs. but only the exhaust springs if stock govenor springs, and a exhaust brake is the setup.

 

[WPeschel]

well the very basic reason, is to keep the valves from floating, during higher than stock rpm (over 3k rpm), and or when the exhaust brake is being used to keep the valves seated. the stock springs can start to float at around 3200 rpm, with the 60lb. springs, i have seen 4k RPM, many times. they are a necessity so you dont cause damage to your valve train, and or even psiton damage.



wes



edit: if your planning on doing a 3 or 4k govenor spring kit, you need to do both intake, and exhaust valve springs. but only the exhaust springs if stock govenor springs, and a exhaust brake is the setup.

Do you need titanium retainers when running 3k gsk??? When would the titanium retainers be needed?? Sorry for the hijack

 

[AWard]

Hijack all you want, i'd like to know that too... .

 

[GAmes]

I used the originals.

 

[WDimig]

nope no need for the titanium retainers, the stock one will do just fine, they have so far on my truck, and many others.



wes

 

[AndrewKing]

HI,

While it probably doesn't do it, do the 60 lb springs wear out the cam or lifters any quicker than stock springs?... . Would they adversely affect mileage to any appreciable amount (because of added friction of the lifters against the cam)?

I am glad to see this thread because I just bought a 1997 Dually for towing and heard about the spring thing regarding the exhaust brake...

Thanks!

Andrew

 

[Bob4x4]

Cummins was the first to offer the HD springs,they would not sell a part that would be detremental to there powerplant.



Bob

 

[Vaughn MacKenzie]

I'm thinking the titanium retainers are mainly used by those guys winding their 12-valves to 5000-6000 RPM.

 

[AndrewKing]

Thanks Bob...

Andrew

 

[Joseph Donnelly]

Use of the Cummins heavier valve springs originally intended for engines with exhausst brakes became popular after I found the horsepower curve to get "ragged" over 3200 rpm, about ten years ago. Flat spring dampers in the valve springs would help a lot in reducing spring harmonics. Gassers have used them for many decades.

 

[JDKammin]

I bought a set of 60 lb. exhaust springs. Will the same set work for replacement intake valve springs?

 

[Shadrach]

FYI The Cummins p/n for 60# springs is 3916691. They have a white stripe on them for identification. And yes they will fit the intakes also. Shadrach

 

[JDKammin]

Shadrach, thanks for the info. The springs I bought do have the white stripe. I will order another set for the intake side.