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Engine Specific Info and Questions => IDI Engine => Topic started by: vwjunkie53 on September 08, 2010, 06:45:35 am
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Has anyone built one, or seen directions for making one. I'm not talking super sophisticated, but more than spinning the pump with a drill! I did a search with no luck, and I also searched the web through yahoo and google. Had no problem finding DIY instuctions for a injector pop tester, but came up dry for a pump stand. Any ideas or suggestions would be great.
Thanks,
Jason
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Someone was talking about building one a while ago... I guess you'd have to figure out what you were trying to measure and what you planned to do upon measuring it - for instance it wouldn't be hard to measure the output from all 4 delivery valves, but if they were different what would you do? Likewise you could sort out how much fuel you're getting at a given RPM and throttle position, but again it takes a pump master to really know how to process the information.
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for instance it wouldn't be hard to measure the output from all 4 delivery valves, but if they were different what would you do?
I'll be interested in this thread, as it's something I've been mulling over recently
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Pretty much, I'm interested in pump output quantity, and to be able to calbrate it for full output and still be able to return to idle, rather than playing with it on the engine and having it try to run away on me. I suppose, on a more basic level, just to test that the pump works at all!
Jason
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What if either each delivery valve or all 4 combined and were routed somehow into very precise graduated cylinders. Then hook up either something like a counter that will tick for every revolution or push a measuring wheel against the IP pulley. With that, you could repeatedly turn the pump over enough times to get a volume of fuel large enough that it can be measured with reasonable repeatability
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It's amazing how useful the the search function is.
Not very usefull for me, as I searched for ve test stand, ve pump tester, etc... and didn't come across your thread.
Thanks for the link though.
Jason
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Running pump and delivery valves and open lines wouldn't tell you much, surely you need the back pressure of injectors. Specifically your injectors as in situ, to see what you are really getting, and a set of closely calibrated injectors to prove fault with delivery valves. If your injectors squirted equally into 4 bedpans with their respective line and their delivery valves on their pump, then that's as far as you needed to go IMO......
Otherwise
Swapping delivery valves around would then indicate 'odd one out' ... Well that's how I'd do it on a budget.
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I've never asked, but when you read different performance fuel pump ratings, they usually list how many cc's of fuel the pump pushes. That must be straight from the pump, unless there is a specific calibrated test injector. Different injectors obviously flow different amounts of fuel so that wouldn't really tell you pump capability.
Jason
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I've never asked, but when you read different performance fuel pump ratings, they usually list how many cc's of fuel the pump pushes. That must be straight from the pump, unless there is a specific calibrated test injector. Different injectors obviously flow different amounts of fuel so that wouldn't really tell you pump capability.
That's the wonderful thing about advertising... most people never even stop to question it.
As soon as the word "performance" is mentioned all bets are off. Every pump manufacturer has very specific specifications for testing their pump but once it's been modified there are no ISO standards and most shops keep their mods and bench setups highly guarded. A pump with shop A's setup may flow 400ccs but with shop B's setup it could flow 600ccs.
In the Cummins world lots of guys don't want to have shops build their pumps because they know that if the shop that is doing the build isn't very familiar with high output pumps they will cause a lot of damage to the pump because the test plan specifies certain nozzles with certain orifice plates. The stock injector setup simply can not flow as much fuel as the pump is trying to push out and expensive damage results.
If you are planning on building a test bench with the purpose of testing pumps according to Bosch test plans you will also need to match the line length and diameter, the injector nozzle and the orifice plate and any of the other specs on the test plan.
If you just want to build something to see if the pump works then really a drill is all you need. If you put a lot of effort into the bench you would probably be ahead of the game to buy either used or Chinese.
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so how many ccs does shop g's put out :P
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He could tell you, but he'd have to kill you. ;D