Bosch Pump Chatter

[n0v0s]

I don't see why you/people in general should make the jump up to a smoky 11mm when there are pumps out there with a compatible 10mm heads....

Have you played around much with the dynamic advance system? ground the advance piston and elongated the the slot in the bottom of the pump body to get more advance?

Dan, at first i was thinking that grinding the slot would have the same effect as grinding the actual advance piston.. but then on thinking about it.. no. As grinding the piston would only work to a limited extent as the slot would them be the next limiting factor. I'm interested in doing this mod now.

For those that have not ventured deep into a ve, this is the slot:

   

Through there goes a pin, which is also attatched to the dynamic advance piston below. The piston moves depending on the internal pump/inlet pressure ratio .. basically moving with increased rpm. As it moves.. it pushes the attatched pin with it .. which then essentially twists the roller cage in the main pump body, causing fuel injection to advance. If you don't follow, but want to.. read up on it. Theres lot of literture available through simple google searching.

   

The arrowed part is the piston.


I have carcassed 3 VEs and am building up a new hybrid along with a 10mm pump. This discussion has potential to be awesome so lets keep it going! I have lots of pump pics/porn to go up for reference if needed