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Author Topic: max RPM with IDI?  (Read 8641 times)

July 01, 2007, 02:45:52 am

nokivasara

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max RPM with IDI?
« on: July 01, 2007, 02:45:52 am »
How high RPMs can you get out of VW diesels? Is the 1.6 more high revving than 1.9? What about the 2.4 inline 6-cyl?

I'm having a discussion with a friend, what's the highest revving diesel you know?
It should still be driveable, not like a second before it blows up during blowby :lol:
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Reply #1July 01, 2007, 04:09:58 am

Audi80

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max RPM with IDI?
« Reply #1 on: July 01, 2007, 04:09:58 am »
I donīt have a tach, but I calculated that I revved my 1,6 ~5500@5th gear. At smaller gears, it revs higher and is very driveable.
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Reply #2July 01, 2007, 08:05:39 am

nokivasara

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max RPM with IDI?
« Reply #2 on: July 01, 2007, 08:05:39 am »
Not bad to reach 5500 in fifth!
Is it possible to reach over 6k rpm?

Ps. Siisti Scirocco :wink:
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Reply #3July 01, 2007, 08:19:24 am

jimfoo

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max RPM with IDI?
« Reply #3 on: July 01, 2007, 08:19:24 am »
I thought Jake was running up to 6000 RPM. I found this dyno run of his. it was from his Rabbit 1.6lTD autocrosser.
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Reply #4July 01, 2007, 09:09:02 am

RabbitJockey

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max RPM with IDI?
« Reply #4 on: July 01, 2007, 09:09:02 am »
i've heard rumors of some guys race engine running 7k, an di wouldn't really doubt it
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Reply #5July 01, 2007, 12:07:53 pm

Op-Ivy

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max RPM with IDI?
« Reply #5 on: July 01, 2007, 12:07:53 pm »
Look at the drop in power at 5250!!! Thats gross... I can just feel the engine screaming for bloody mercy....

I don't have a tach wither. But I have revved my (soon to be old) 4S transmission to 40km/h n 1st. Which is approx. 5k rpm. Thanks to http://scirocco.org/gears/ for the conversion!
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Reply #6July 01, 2007, 12:55:04 pm

ezekiel

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max RPM with IDI?
« Reply #6 on: July 01, 2007, 12:55:04 pm »
it's really not beneficial to rev like that if there's no power.

and power is going to suck up there simply because of how a diesel works.

the fuel needs time to ignite, that's why we have such long strokes and small bores, because a long stroke allows for more time near TDC through the arc, allowing the engine to ignite more of its fuel vs, say, a gasser with a short stroke and big bore, they hit TDC and just bounce away from it quick (rod length dependant)

and at such high rpms with such a long stroke, we run into piston velocity problems, they just can't take the speed.
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Reply #7July 01, 2007, 01:16:33 pm

nokivasara

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max RPM with IDI?
« Reply #7 on: July 01, 2007, 01:16:33 pm »
That's what I thought, no way they can rev up to 7000 like my friend said his Golf did :lol:
Actually he said that he hadn't calibrated his tach so that explains it.
The torque at low- and mid rpm is what diesels are all about...
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Reply #8July 01, 2007, 03:06:46 pm

jimfoo

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max RPM with IDI?
« Reply #8 on: July 01, 2007, 03:06:46 pm »
The engine configuration is a liquid cooled, normally aspirated, 584cc (36 cu in) double overhead cam single with four valves per cylinder. Diesel fuel supply is through a special Fuel Injection unit and single injector developed specifically for the task and the Kawasaki-based combat bike produces a respectable 28 bhp at 5500 rpm with meaty flat power delivery from 1500 and 7000 rpm.

Unlike its gas-guzzling counterpart, the engine has multi-fuel compatibility and can use commercial diesel (inc low sulfer fuel), NATO Military Spec Diesel Fuel, Bio-Diesel (B20 or B100), Aviation Kerosene including JP4, JP5, JP8, and AVTR and plain old Kerosene.

Not a VW, but revs to 7000
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1966 Land-Rover 88" with 1.9 1Z which has been transformed to an M-TDI
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Reply #9July 02, 2007, 01:08:01 am

OM617

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max RPM with IDI?
« Reply #9 on: July 02, 2007, 01:08:01 am »
Also not a VW, but I know of a few IDI Mercedes diesels modified to run 5700-6000rpm at full power.
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Reply #10July 02, 2007, 09:15:56 am

Black Smokin' Diesel

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max RPM with IDI?
« Reply #10 on: July 02, 2007, 09:15:56 am »
The engine itself will take 6000 to 6500 rpm but the injection pump's camplate won't keep up and start to skip above 5500.
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Reply #11July 02, 2007, 09:34:23 pm

Cheesetoast

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max RPM with IDI?
« Reply #11 on: July 02, 2007, 09:34:23 pm »
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Reply #12July 03, 2007, 12:49:27 pm

935racer

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max RPM with IDI?
« Reply #12 on: July 03, 2007, 12:49:27 pm »
I've revved many 1.6's over 6 grand, need a lot more dynamic advance to make power that high though.

Heres a pictures from Malones old Jetta ,on its way to 6k.

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Reply #13July 03, 2007, 02:28:13 pm

mpg

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max RPM with IDI?
« Reply #13 on: July 03, 2007, 02:28:13 pm »
A couple of the hardcore vw diesel guys down here claim 7200rpm calculated by a g-tech or whatever. I found it hard to believe, untill I got behind one of them on the highway (cough, sniff, cough), and found out my vr6 would hit 170kms in 3rd gear, trying to catch him. These guys have been toying with these ve pumps for a while...  Next time I see one of 'em, I'll suggest taking a pic of there tach wound right out :)
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Reply #14July 03, 2007, 02:32:47 pm

935racer

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max RPM with IDI?
« Reply #14 on: July 03, 2007, 02:32:47 pm »
Quote
A couple of the hardcore vw diesel guys down here claim 7200rpm calculated by a g-tech or whatever. I found it hard to believe, untill I got behind one of them on the highway (cough, sniff, cough), and found out my vr6 would hit 170kms in 3rd gear, trying to catch him. These guys have been toying with these ve pumps for a while...  Next time I see one of 'em, I'll suggest taking a pic of there tach wound right out :)


Dang 7200!? I don't think I have ever been over 6700, and that was really pushing it, I'd love to rev to 7200, especially if I was still making power at 6600rpm. Any of those guys on this board?
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