knife edging..

[prNonVtec4u]

i was wondering, does any1 here have any experience with knife-edged crankshafts?

i'm kinda looking into it, it really got my attention

Thnx!

[NAiL05]

It makes the crank more "aerodynamic" and helps the crank spin free'er. I forgot the whole process but it is used in racing applications. Most people dont do it to hondas (havent seen anyone do it) but they have balanced and lightened the crank I see quite a bit of people with the big v8 and crap do it. Not as much in the 4 cylinder motors.

[KillerCam282]

It makes the crank more "aerodynamic" and helps the crank spin free'er. I forgot the whole process but it is used in racing applications. Most people dont do it to hondas (havent seen anyone do it) but they have balanced and lightened the crank I see quite a bit of people with the big v8 and crap do it. Not as much in the 4 cylinder motors.

Its makes it cut through oil faster, not necessarily aerodynamic since its not fighting any kind of drag. Its also done to lighten it up. The reason why its not done with Honda is because the crank will never be truly balanced. Because of this knife-edged cranks fail after 8 or 9 thousand miles in most Honda engines. Its not worth it if you are looking for some kind of street/strip setup. The more expensive alternative is a Scat lightweight crank that cost as much as the OEM from the factory.

[NAiL05]

Ya thats waht I wanted to mean by aerodynamic in the oil pan. I couldnt think of a way to describe it lol.

[prNonVtec4u]

ok, idea's been killed, lol, thnx a lot!

[VBaccord24]

why is it kill after 8 to 9k?

[NAiL05]

Well you are shaving quite a bit of material off the crank so that can mess up the rigidity. YOu can try to cryo it but this application is usually used on race cars and crap where teardown is mandatory. For a DD not really recommended. Most people on street cars for hondas they just lighten/rebalance crank and call it a day.

[prNonVtec4u]

how would you "lighten" then?

[KillerCam282]

how would you "lighten" then?

Why is it mandatory to lighten your crank?

[wed3k]

Why is it mandatory to lighten your crank?

less rotating mass = frees up hp

and if you are building a race car, every hp counts.

[Jarrett]

Its makes it cut through oil faster, not necessarily aerodynamic since its not fighting any kind of drag.

I'd say that's true to an extent. It's not really "cutting" through the oil in your pan because the majority is underneath a windage tray in most oil pans. Aerodynamic properties are important, just not for cutting through a puddle of 10W-30 in this instance.

[KillerCam282]

I'd say that's true to an extent. It's not really "cutting" through the oil in your pan because the majority is underneath a windage tray in most oil pans. Aerodynamic properties are important, just not for cutting through a puddle of 10W-30 in this instance.

There is a limited airspace inside the block. Its not really fighting any real aerodynamic drag (like wind from an opposite force). It does make for a revvier engine by cutting down rotational mass. In actual race engines, like the shortblock V8s found in Nascar Nextel Cup Cars, the crank constantly cuts through the oil due to the shallow oil pans (the pans hold only a quart...or slighty more).

As far as freeing up HP wed3k, I know that. However, this isn't an all out race car. Or maybe it is, and I just don't know that. If thats the case, I personally would just buy a forged lighter crank, but not hack up a factory crank. Longevity > Cost Effectiveness IMO. Besides if its a race car, its already implied that it will be costly(either time or money, perhaps both).

[foamypirate]

Hasport knife edges their cranks, or at least, they used to when my cousin worked there. I never asked him about their reliability though. He's coming up from AZ this next week, so I'll be sure to ask him and report back. I'm pretty sure if anyone knows anything about knife edging, it's hasport, and the people who build/built their race cars.

[NAiL05]

There is a limited airspace inside the block. Its not really fighting any real aerodynamic drag (like wind from an opposite force). It does make for a revvier engine by cutting down rotational mass. In actual race engines, like the shortblock V8s found in Nascar Nextel Cup Cars, the crank constantly cuts through the oil due to the shallow oil pans (the pans hold only a quart...or slighty more).

As far as freeing up HP wed3k, I know that. However, this isn't an all out race car. Or maybe it is, and I just don't know that. If thats the case, I personally would just buy a forged lighter crank, but not hack up a factory crank. Longevity > Cost Effectiveness IMO. Besides if its a race car, its already implied that it will be costly(either time or money, perhaps both).

As I recall Nascar runs a dry sump system to keep there stuff lubricated spinnin at constant 8000 rpm or so. So there really isnt much in the oil pan as you mention.

[prNonVtec4u]

Hasport knife edges their cranks, or at least, they used to when my cousin worked there. I never asked him about their reliability though. He's coming up from AZ this next week, so I'll be sure to ask him and report back. I'm pretty sure if anyone knows anything about knife edging, it's hasport, and the people who build/built their race cars.

that'd be cool