Engine/Transmission (1994 - 1998) 4k Gsk

[Xtremewheeling]

I installed a 4K GSK in my '96 5spd tonight. I could feel a big improvement once I got it out of the garage. So now could someone please explain to me why this made such a difference in the way my truck seems to perform now. I'd like to learn whats going on and how the springs help everything to work better. Thank You

... ... HD Valve Springs to be installed soon... ...

 

[Flinty]

Was your governor spring stock before? What compelled you to go with a 4k instead of the 3k? Thanks.

 

[fortunate1]

In stock form, your truck's governor will begin to restrict fuel at about 2500 rpm. It does that by allowing 2 "arms" to pull out away from the pump's shaft at that rpm - the stock springs' force to keep the "arms" in close to the shaft is overcome by the spinning of the shaft (centrifugal/centripetal force).

The GSK springs are stronger, and will keep the arms in close at a higher rpm (usually ~3000 or ~4000 rpm). I was told that this is like an ice skater doing a spin: if she wants to spin faster, she keeps her arms in close; then to slow down the spin, she lets them fly out away from her body.

So, with the GSK you get to use more of the higher-end rpm (for more HP) that the stock springs don't let you have. But don't rev to high; stuff can break if it's moving too fast.

 

[CogginsP]

The governor springs and flyweights rotate at the same speed your motor does. As flyweights compress the springs, it begins to move the governor arm back, which is hooked up to the fuel rack. The more the flyweights compress these springs, the less fuel the p-pump will put out. It's a lot easier to understand if you are a hands-on learner like me... take off the AFC and remove the fuel plate... push your throttle full forward, use one hand to keep it full forward and push back on the governor arm yourself. This is the action of the governor springs being compressed by the flyweights. And if you turn your motor over you can actually see the gov springs and flyweights compressing them.

 

[pwerwagn]

Also, not only do the gov springs change when the pump defuels, they change the fueling characteristics of the pump itself. The lever moves on the plate at a different pace with the 4k springs than the stockers.

 

[CogginsP]

Right, the governor springs are constantly working. Even at idle. If your idle speed starts to go too low, the flyweights will react according to RPMs and the gov arm will move forward, allowing more fuel to increase RPMs. The springs work differently because they are harder to compress than the stockers. The faster the flyweights can spin without compressing the spring, the less action they have on the governor arm. It sucks trying to explain this stuff without using your hands!!!

 

[Bloomy]

It's about time!!!! How long have you been sitting on those? Told you you would like it and it wasn't that hard! I'll be up in PA starting next Wednesday. You should wonder by the Grange and try to pull on that Friday. Track is terrible and the sled is worse so a lot of decent diesels don't show, but its still a pull!



Thomas