Author Topic: Governor mod question (Read 11204 times)

rallydiesel · « **on:** April 08, 2007, 09:50:36 am »

When you are shimming the intermediate spring, do you want to compress the main spring or keep it at the original position? I have read you want to preload the main by 1/4". But is that compared to the relaxed position or the original position when it's in the holder?

DVST8R · « **Reply #1 on:** April 08, 2007, 10:11:53 am »

1/4" in the holder, and yes this will compress the main spring a little bit.

rallydiesel · « **Reply #2 on:** April 08, 2007, 11:49:32 am »

Thanks!

Benjamin · « **Reply #3 on:** April 08, 2007, 02:53:40 pm »

why is it needed to have more preload on the main spring?
i thought you only need to shim the intermediate, is that the reason why i dont talk about a big difrence like the other guys do?

Greetz, Benjamin

Tintin · « **Reply #4 on:** April 08, 2007, 04:05:15 pm »

The main spring determines when the engine will cut-off at high RPM, it is only that it which should be hardened or shim, the intermediate spring is already completely compressed around 2000rpm ( that depend of the model of pump), if you put it harder the intermediate spring, not only that gives absolutely anything, the RPM will be hard to control at low RPM, the car will make shudder in first and second gear at 1/4 throttle, and the high RPM cut off will not be changed.

rallydiesel · « **Reply #5 on:** April 08, 2007, 07:12:11 pm »

So you are saying keep the intermediate spring and shim the main spring 1/4"? :?: :?:

Tintin · « **Reply #6 on:** April 08, 2007, 08:56:20 pm »

jimfoo · « **Reply #7 on:** April 08, 2007, 09:45:28 pm »

Now I'm confused too. In the governor mod post in the FAQ, it says to remove the intermediate spring and replace it with a shim instead. The other version talks about shimming the main spring a little, but also removing the intermediate spring and replacing it with a shim. My understanding was that the intermediate shim delayed the slowing of fuel delivery until the 4-4.5k rpm range, and shimming the main spring raised the max rpm for fueling.

DVST8R · « **Reply #8 on:** April 08, 2007, 09:56:21 pm »

I don't want to argue with named tintin as he has built far more pumps then I, but I personally have never had the problem with shuddering, or low rpm control (well i don't know about the last one as it is rarley in the low rpm's... :lol: ) But I have shimmed several pumps by removing the intermediate spring and shimming the main spring.

After looking at his picture though, I am going to use that method from now on. As I may have not noticed any shuddering, but named tintin's way is still probably better for driving anyway.

That pic needs to be in the FAQ.

carrizog60 · « **Reply #9 on:** April 09, 2007, 01:48:34 am »

sooner or later i am going to do the governor mod...
i want to rev to 5500 but with fuel enough to go there still making HP...
is it possible to mod the governor to work that way?

Benjamin · « **Reply #10 on:** April 09, 2007, 04:08:41 am »

Quote from: "Named Tintin"

you did nothing with the intermediate, only the main...
The FAQ says to shim the intermediate.

i dont know it anymore :shock: what to do, or not :cry:

Greetz, Benjamin

rallydiesel · « **Reply #11 on:** April 09, 2007, 06:35:33 am »

Is the third (idle?) spring missing for any reason? So all tintin did was add a shim to the main spring, right? I will try that way first and see how it goes.

Tintin · « **Reply #12 on:** April 09, 2007, 07:03:41 am »

I do not have a problem either for the shudder :lol: :lol: , I dit not employ the exactly good expression.

For example: When you drive in the dense traffic the morning to go to work, with to hard or Without intermediate spring, it's difficult to drive in first and second gear at low rpm, because the accelerator is very sensitive, at the momnet that you pusch the accelerator , the car accelerates quickly, and it's very hard to maintains a regular RPM, some time that made of the shudder, but, with normal intermediate spring, the accelerator is much softer, and the RPM is controlled, the intermediate spring govern the rpm at fixed point, over 2200 -2800RPM, the intermediate is fully compressed, at the moment, it's the main spring wich enters in play.

I tested different set-up of spring and it is what I could observe, when I built a pump, some time I need to dismount the top of the pump several times for balancing the 3 springs correctly, I know the effect of each spring if I hardened or softened one or the other.

Benjamin · « **Reply #13 on:** April 09, 2007, 10:26:38 am »

Quote from: "rallydiesel"

Is the third (idle?) spring missing for any reason?

i think its stock, i rebuilded a pump like this one also, the idle spring is on a difrent location.

so, wich spring to disable the feul cut? the intermediate shimmed, the main with more preload or the 2?

??

Greetz, Benjamin

DVST8R · « **Reply #14 on:** April 09, 2007, 03:55:42 pm »

The main spring is what control's the final cut of the fuel. We have all just approched it slightly different.