I've ran over 8000 rpm when I had the A-pump.The problem is that it would only last so long before the plungers would lock and the rack would jam.Apparently the larger the plunger then the less likely it will survive high rpm.The 10mm bosch lasted for a while.If you were to run 8.5,9 or 9.5mm then It would take more abuse for longer.Our A-pump had lots for work done to it.
We had the cam re worked,stiffer plunger springs,AG gov with lightened weights,delivery valve mods,rack mods etc....Also supplied with a fass at 55 psi and lots of stanadyne lubricity.
The guys across the pond seem to be more determined to make things work I guess.I've heard of many high HP TDI's and mercs running either VE/VP or inline inj pump over there.
If you max out a smaller plunger then injection duration is longer.We choose to run a larger plunger (13mm) at half speed to let it survive and keep duration within reason.I don't use much rack travel to put out plenty of fuel for my engine.My half speed system has yet to be proven a real success though.If the weather holds I might get out this weekend for testing,Fingers crossed.
There are some that say common rail should do the job too...
Because I'm stupid, I've put thought into this. Actually think-tanked it a few years ago over several weeks. Here's the deal, Tobin already touched it, the burn rate of diesel. Audi can afford to have custom diesel made, and they're not using a janky, mechanical, antique platform. Find someone that has real, accurate, in cylinder pressure data, and you'll find your grail. Unfortunately it's not in a Cummins, or something someone short of a multimillionaire can conjure.
Also, 5.9L piston speed is 4720fpm at 6000rpm, since that's been brought back up
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I have drawn up on paper with my old college drafting tools, a 600 cu in engine that will fit under my old '90 models hood with no mods. .
Gonna take a awful lot of air to feed 600 inches @ 8k. At that rpm on even a 14mm A pump timing is going to need to be ridiculously high.
I would think a big bore short stroke 400ish inch engine would be better suited.
I'm seriously trying to imagine a head with possibly 2 injectors per cylinder, and 2 14mm p7100's each run at 1/4 engine speed......
I wonder how this Sigma I have sitting here would deal with 8k....
Well, the formula I found is stroke x rpm ÷ 6 = piston speed in fpm. So, 4.72 x 6000 ÷ 6 = 4720. What am I missing?
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Takes energy to swirl air. Good or bad, that is for you to decide. Just throwing it out there.
Not trying to side track hear at all. Some of the folks I was hoping to get involved are listening and now some are replying. yea haw.
Has anyone ever pulled the valve cover off the top of one of these new Kohler diesels that Polaris is using? I couldn't believe what I saw...
My phone is being silly. That was in reply to the Kohler engine.Cam driven unit injectors.
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Yes lots of air. Have you seen this Garett I bought?? lol Seriously, this thing is something else.