Try this thread[/u].

I haven't really been able to ascertain what exactly the goal is of the governor mod? What are we trying to do within the pump?

the govenor start tapering off fuel at about 3500 rpm iirc. by modding it you are able to get full fueling up to redline then it starts to taper it off then. or just remove it and rev to 6000+ rpm. and hp is toque x rpm/5252 so therefore you are able to get more power.

hope this helps

Mark

Ok, how does the governor work exactly? What are we doing by increasing spring tension?

there are lttle flywieghts in the pump...the faster the engine turns the more pressure it puts on the springs and when they start to move it decreases the fuel. becasue it works like this it cant just cut out the fuel all at once, so to have it cut out at where it does it starts tapering it off way earlier. so by shimming the spring you basically increase the amount of force it takes to start moving the spring, so it take a higher rpm before it takes away the fuel. if you are going to try this i recomend you find an old scrap pump and take it apart to see how it works, so you dont screw up your good one.

good luck

Mark

-edit-
yes, it will work an all rotary pumps.

if i find the time, ill go mod one tonite and post a pic by pic explanation on how to do it.

as far as how it works, basically what u are doing when u push on the gas, is pull a spring. at lower rpm's that spring just acts as a conector hooking the throttle are to the actual internal linkage. there are flyweights pushing a rod at the linkage. when the engine speeds up the flyweights push out harder and harder till the rod's force will overcome the spring tension. once this happens the rod starts moving the throttle linkage back farther and farther untill it's not putting out enough fuel to turn the motor any faster, another way to move the linkage back is to take your foot off the gas. anyway, because this all relys on centrifugal force, it happens in a linear motion due to rpm. so in oreder for it to take away all the fuel so it only revs to 4800 rpm, it has to strat cutting it out at 3500 rpm.

anyone correct me if i'm wrong, but i think i got it.

hope this helps

Mark

So, I've been doing some searching and reading and I see tha Jake says it would cause some issues with the LDA to have a solid linkage. One of the other things was the an old thread on here about the governor mods and travel of the timing advance plunger. It was noted that the 1.5 had a more aggressive advance, so why not use the 1.5 spring in the 1.6 pump?

hmm...so I guess our goal with all of this is just to raise spring pressure so that the counterweights that swing out due to centrifugal force cannot push the metering pin (of sorts) back toward the lever which is controlled through the throttle shaft. I'll have to go play with my pumps tomorrow.  

Thank you for the explanation!