Cumminsfever wrote:I think I have found a cure for this shutdown issue... A special delivery valve. I have been using it successfully in quite a few 4bt pumps now and it seems to have cured them.
I have a guy that dragraced his 4bt, and after the burnout, he chopped the throttle, and it idled perfectly. Repeated it several times on back roads to make SURE it didn't shutdown. So far, no issues.
In one of the Bosch VE books, they talk about some DVs (different from ours) that help correct a number of issues including "Combustion-Gas Blowback".
Talking about DVs . . . . .
Constant-pressure valve
With high-speed direct-injection (Dl) engines, it is often the case that the “retraction volume” resulting from the retraction piston on the delivery-valve plunger does not suffice to reliably prevent cavitation, secondary injection, and combustion-gas blowback into the nozzle-and-holder assembly. Here, constant-pressure valves are fitted which relieve the high-pressure system (injection line and nozzle-and-holder assembly) by means of a single-acting non-return valve which can be set to a given pressure, e.g., 60 bar (Fig. 13).
As an FYI: The "Retraction Piston" Bosch refers to above is whats being ground off when one goes to "Full-Cut" DVs. (As best I can see).