VWDiesel.net The IDI, TDI, and mTDI source.
Engine Specific Info and Questions => IDI Engine => Topic started by: smoken u on July 28, 2009, 09:20:01 am
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just wondering on m,y current build im looking to sp[in around 6000 to 7000 rpm is the stock vavletrain able to handle this rpm??
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oh hell yea, you ever looked at it? its got tough dual spring setups from the factory tho. but uh, good luck spinnin it 7k.
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lol im gonna try my hardest to. I was looking at the dual valve sprinfgs but just wanted to make sure, just becasue i ususally work on cummmins, and you have to upgrade vavle springs on them just to get 4000 rpm outta them. ::)
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The valvetrain and crankshaft will take 7000 rpm easy but the fuel pump will start to skip above 6000 rpm.
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now is that skip just caused by lack of fuel or spinning too fast for the weights inside of it??
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Spinning too fast for the plunger to return to the bottom of it's stroke
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interesting, is there anyway this problem could be overcome at all??
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Don't spin it over 6000 rpm ;)
There will be virtually zero usable Torque or Power above that anyhow. 6000 is faster then you will ever need it to spin ;D
Why do you wish to spin to 7k?
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well i really have no particular reason to spin 7000 rpm, yeah it would be interesting to do so adn one hell of an adventure especially to try to engineer the pump to do so, nothing wrong with tyring to achieve somthing, but think for a moment in the real world, what if you miss a shift, and go say from 5th to second you would see an increase of revs far past what what you could fuel. not saying that i miss shifts, but it does and can happen to the best of us.
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well i really have no particular reason to spin 7000 rpm, yeah it would be interesting to do so adn one hell of an adventure especially to try to engineer the pump to do so, nothing wrong with tyring to achieve somthing, but think for a moment in the real world, what if you miss a shift, and go say from 5th to second you would see an increase of revs far past what what you could fuel. not saying that i miss shifts, but it does and can happen to the best of us.
Hey man if you could engineer it to work it would be bad ass! Do you dump the clutch whilst down shifting? a miss from 5th to 2nd would probably detonate something ?? maybe. Can you make it work to 7k? it would be awesome if you could make it actually make power up there too. but i think then you not only run in to problems with fueling.. but you can't get enough air in.. and out :P those heads were never designed to flow that much LOL
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I don't know. The guy named AKI is building one to do just that. Right around 7,000 RPM. The ideas that come from that guy are amazing and I bet he will have it going soon.
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AKI is insane.. I have read many of his threads. Pure Genius that guy
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i wonder if an inline pump would do the trick, but i guess they could be worse
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(http://tlcequipment.files.wordpress.com/2008/06/diesel-fuel-injection-pump.png)
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thats a fancy looking pump almost like a bosch p series fopund on cummins 4bt's
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id like to see what AKI is doing to get 7000 rpm out of one.
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thats probably exactly what it is...
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thats a fancy looking pump almost like a bosch p series fopund on cummins 4bt's
it could be one for all i know i just got it off google haha. i just wonder if that would be better for revving.
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i wonder if an inline pump would do the trick, but i guess they could be worse
I would think they would be better because each cylinder has it's own plunger so it would be cycling only once per engine rotation where as an inline is cycling 4 times.
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I think you mean a Rotary is cycling 4 times per engine rotation there Tyler. lol
and you work on these lil buggers!? Could never tell lol. ;)
Btw im just bustin' your balls for fun lol. Inline pumps are pretty cool, one plunger per cylinder.. so theoreitcally they should be able to fuel 4x as much as the rotary.. assumg it could stay together, have an engine to fuel, and suck in that much fuel LOL... its bed time i think.... lol
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hmmm inline pump should be able to stay together, like you said 1 piston and delivery valve per cylinder, as for fuel you could use an electric lift pump like a fass or aeromotive pump to supply the fuel that the pump would need. another idea is common rail but there are alot electronics, and computers that are involved in that. kinda takes the simplicity out of it lol
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There is at least one documented TDI engine using an inline pump for a tractor-pulling vehicle. As far as I know, an inline pump mounted to a VW diesel will not fit under the hood. I'd sure love to see someone try it though. The VE pump is the weak point of these engines. I know they are capable of putting out a lot of fuel, they just aren't very good at it. :P
Brendan