How to get 8000rpm's?

[maxfax]

What is the advantage again of reving to 8 grand? other than sounding like a street bike...

The advantage would be that you can brag that your diesel will spin 8 grand...  :lol:

My next question would be, once the engine is capable of that speed, what about the trans? Granted there isn't quite the weight swinging around on thin films of oil but I would think there has to be some limitations there too..

[Aki-76]

trans is no problem,i use 02A, n/a trans. 7000rpm and new wheel,top speed is 250kmh..

orginal aaz sylinder head is no good this high revs,you need hard lifters,spesial valve spring,and bigger valves ( this is import ! ).

Orginal valves is too small over 5500 rpm,and you need feed air to sylinder,lots of...

my sylinderhead is 41/34.5 stainless ( race ) valves and this is minimum size to 7000rpm,no over !

sylinderhead cost about 800-1000e with this modification  :shock:

[maxfax]

WOW!!   Yeah never gave it a thought.. Those hydro lifters would be floating to the moon...

Kinda what I thought on the trans... Everything in order and good synthetic lube oughtta do it..    Not that I'm planning on buidling anything like this... I haven;t come around to wanting a turbo yet...

[lord_verminaard]

Has anyone actually found the redline of one of VWs diesel engines? I mean with stock internals but a modified pump. I was hoping to blow up my NA that way but when the tranny went there went that idea as well.

I bet it would be pretty high.  Remember, the 1.6 engines have the same stroke as most other VW 4-cylinders under 2 liters.  The 1.9 has a 95.5mm stroke, but also remember the 9A 16v, and the ABA 8v, among others, has a 92.8mm stroke, not that far off.  The 16v especially can happily sing to 7000 RPM no problem bone stock.  Now, the pistons of the 1.9 do weigh more, but the rods are beefed up to compensate.  Does that mean you should go out and rev your stock 1.9 to 7000+ RPM's?  NO!  But it sounds like Aki has the bottom-end under control.  The bottom-end work is easy compared to how he's gonna get fuel to it at those RPM's.

Remember folks, when VW tests these engines, they run the piss out of them- they fire them up and run them straight up to redline and hold it there for weeks at a time.   :shock:   They also have to test them to the point of failure- I'd love to get my hands on the data for those tests.  I do remember someone posting something about the original idea for the 1.6 TD, they kept feeding it nitrous until something blew up- I don't remember the data, but I think it made some 300+ HP before the prechambers melted.   :twisted:

Brendan

[Duzty]

Well i will forget the idea about 8000, but then 7000 og just 6500rpm's...

Of course there are done som e govenor mod, but could i remove the govener and get some RPM's?

The engine is almost only used for dragrace.  
And i got a gt3076 to the enigne just beside me :twisted:

[arb]

Has anyone actually found the redline of one of VWs diesel engines? I mean with stock internals but a modified pump. I was hoping to blow up my NA that way but when the tranny went there went that idea as well.

  i wish i had a tach on my old rabbit when it ran away and blew up,  that would have been nice to know since there was no piston, rod or valve train damage and that thing was screaming.  honestly though i think revving one of these motors to 8k is going to take alot of work,  maybe a custom inline pump would be able to do it, but really common rail and a computer would be what i would think would work best, or maybe an 8cylinder pump setup some with 2 lines to each injector.  but honestly with the weight of the internals and many other factors i just really can't see this being done in any kind of way that is even remotely cost effective or practical.

HEY !! That's an idea - do a serious propane inject setup to fuel the thing above 7,000 when the diesel IP starts to peter out. Basically like a large Cox engine like our model planes had.

[Aki-76]

keyword is fully balanced

http://i434.photobucket.com/albums/qq68/Aki-76/29012009264.jpg

http://i434.photobucket.com/albums/qq68/Aki-76/moottorin%20osia/IMG_3806.jpg

bombproof bottom end

http://i434.photobucket.com/albums/qq68/Aki-76/moottorin%20osia/16032009306.jpg

http://i434.photobucket.com/albums/qq68/Aki-76/moottorin%20osia/16032009307.jpg


 

[rabbitman]

Has anyone actually found the redline of one of VWs diesel engines? I mean with stock internals but a modified pump.

I remember Jake (fspGTD) blew his up. The way I recall it he was screamin' in third and missed fourth and hit second gear instead. IIRC he was guessing it hit almost 8000rpm. I think the problem was the valves floated and got smacked and somehow a spme lifters turned on their side. I think it ruined the head.

EDIT: He grabbed 1st instead of third while accelerating.

For your reading pleasure, here's the story: http://vwdiesel.net/phpBB/viewtopic.php?t=406&highlight=head

[blackdogvan]

Has anyone actually found the redline of one of VWs diesel engines? I mean with stock internals but a modified pump.

I remember Jake (fspGTD) blew his up. The way I recall it he was screamin' in third and missed fourth and hit second gear instead. IIRC he was guessing it hit almost 8000rpm. I think the problem was the valves floated and got smacked and somehow a spme lifters turned on their side. I think it ruined the head.

EDIT: He grabbed 1st instead of third while accelerating.

For your reading pleasure, here's the story: http://vwdiesel.net/phpBB/viewtopic.php?t=406&highlight=head

Too bad every pic link is dead...

[jtanguay]

Has anyone actually found the redline of one of VWs diesel engines? I mean with stock internals but a modified pump.

I remember Jake (fspGTD) blew his up. The way I recall it he was screamin' in third and missed fourth and hit second gear instead. IIRC he was guessing it hit almost 8000rpm. I think the problem was the valves floated and got smacked and somehow a spme lifters turned on their side. I think it ruined the head.

EDIT: He grabbed 1st instead of third while accelerating.

For your reading pleasure, here's the story: http://vwdiesel.net/phpBB/viewtopic.php?t=406&highlight=head

i bet if he had some stronger valve springs, he might not have killed his head.  the stock valve springs weren't strong enough to pull the valves back into the head fast enough at those speeds, and they 'kissed' (of death) the pistons.  but the added friction would probably kill the camshaft quicker though...