Knife edge crank

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Naku786
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Knife edge crank

Postby Naku786 » Fri Apr 08, 2011 8:58 am

:hi:

What does this mean? I hear alot of guys talking about it & also the TDi crank conversion.

Whats the benefit of it & what application is it intended? (Track car, drag car, daily)

Thanks :driving:
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Solo786 wrote:after you bust the rsi , should have put down the window and asked "Do you even lift bro?"

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Re: Knife edge crank

Postby Torker » Fri Apr 08, 2011 9:01 am

The stroke on a TDi crank is 95.5mm, larger than a std 2.0 crank's 92.8mm so it will give you slightly larger dispacement.
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Re: Knife edge crank

Postby Naku786 » Fri Apr 08, 2011 9:05 am

Torker wrote:The stroke on a TDi crank is 95.5mm, larger than a std 2.0 crank's 92.8mm so it will give you slightly larger dispacement.


Thats what knife edge means? lol I taught it made your car rev up quicker
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Solo786 wrote:after you bust the rsi , should have put down the window and asked "Do you even lift bro?"

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Re: Knife edge crank

Postby Torker » Fri Apr 08, 2011 9:08 am

Naku786 wrote:
Torker wrote:The stroke on a TDi crank is 95.5mm, larger than a std 2.0 crank's 92.8mm so it will give you slightly larger dispacement.


Thats what knife edge means? lol I taught it made your car rev up quicker


Knife edging is something different where they take metal of the crank - makes it lighter and more aerodynamic so it should make your engine rev up quicker. You can see the taper on the counter weights on the crank in the photo - that's knife edging:

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Current rides:

VW Golf - 83 GT 2.1 16V 2-door with throttles
VW Golf - 78 LS 2.0 8V 4-door (2.1 ABF with throttles in progress)
VW Golf - '08 Citi Storm - 1.4 for now
Hyundai - 1.4 Getz (daily)

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Re: Knife edge crank

Postby Naku786 » Fri Apr 08, 2011 9:18 am

Torker wrote:Knife edging is something different where they take metal of the crank - makes it lighter and more aerodynamic so it should make your engine rev up quicker. You can see the taper on the counter weights on the crank in the photo - that's knife edging:


Will this decrease the amount of torque(nm) the car produces?
1893cc racecar - back in the garage
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Solo786 wrote:after you bust the rsi , should have put down the window and asked "Do you even lift bro?"

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Re: Knife edge crank

Postby GTiDon » Fri Apr 08, 2011 4:31 pm

Im impressed.. Normally by this time of a thread with this question everybody would be telling you not to knife edge, not to even think about it and to stay away...

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Re: Knife edge crank

Postby Coroner » Fri Apr 08, 2011 4:40 pm

gtidon wrote:Im impressed.. Normally by this time of a thread with this question everybody would be telling you not to knife edge, not to even think about it and to stay away...

As far as my research goes, its not recommended for a daily. Also according to the Mythbusters thread the TDI crank eats bearings on a normal 2l.
If not done correctly you could end up with a lot of damage.
Speed is money......how fast do you want to go?

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