Hmm. ???I thought that the cummins pumps were better than that. A Bosch VE pump is a Bosch VE pump And I do like low end torque, but at the same time I was aiming to raise the torque curve on the engine a bit to make life easier on all the parts. Simple, the reason they make SO much low end torque is the turbo. 1Z had the GT15, AHU had the K03, and the ALH got the VNT15(? 17 ?). They all have the ability to get the boost up QUICK, and with that the engine has the ability to DUMP the fuel in really early. Bam, a butt-ton of low end torque. Being that the fuel is injected in to a cup in the piston, and with a much more efficient injector nozzle the fuel gets a way better burn resulting in more torque over an IDI of the same displacement.I have met a veteran member of this forum in person before at a meet who has given me some info. He recommended that I have a lift pump for a cummins pump. That way there is adequate fuel in the pump at all times to cool and lubricate it.Lift pumps are always a good idea, I have installed an electric pump in the engine bay of every car I have worked on that didn't have one stock already. ALL my VW diesels have gotten one from me, as well as my old carb vehicles no more dry bowls and 10 years of cranking! lolTruck wise I know ve pumps are good for at least 3200 rpm. I think someone might even carry a 3800 rpm spring now. I'm sure like everyone else I'll have to experiment with pump parts once I get it going.Ok but even 3800 is only 1900 pump RPM. That is obviously still a safe rpm as you don't hear of Cummins trucks having seized pumps. It helps that their engines don't want to spin any more revs than that too.. . 2250 pumps RPM is 4500 engine RPM, and I am sure you will find that is enough unless you run a REALLY big turbo. What is the point though? is this a race engine? A 12mm Bosch head is worth a lot of money, too much to be experimenting with. For that part, get it in theory first lol
I rev my mTDI with Cummins 4BTA pump over 4,000 rpms (engine) routinely and haven't had any issues. I've cruised it on the freeway over 3500 rpms for hours at a time. I wouldn't want to rev it to 5K anyway as the TDI combustion properties stink when turning that fast.
Quote from: libbydiesel on August 15, 2012, 11:09:21 amI rev my mTDI with Cummins 4BTA pump over 4,000 rpms (engine) routinely and haven't had any issues. I've cruised it on the freeway over 3500 rpms for hours at a time. I wouldn't want to rev it to 5K anyway as the TDI combustion properties stink when turning that fast.Surely you have heard of the seizure issues? It would seem there are a few different types of 12mm Bosch head, and only one or two of them are actually capable of 2500 pump rpms.
I feel absolutely no concern about running a Bosch 12mm plunger for the whole rpm range that the TDI motors are comfortable.