Forged Steel Xr6t Cranks

[Guest]

ah me nizpro motor, at least when it blows up. nobodies allowed to talk about it

[Typhoon]

"As for sharing that sort of sensitive information on a public forum. I chose not to as most idiots will take it the wrong way and it would cause more problems then help prevent."

That's my point exactly. Idiots jumping to immediate conclusions.

This is why I will not discus sensitive info on public forums. Idiots like you will always *uc* up a good thread with pointless bullsh*t as per your above crap......... Ummm I have no idea how to respond to this guy so I will just attack a company for no reason.

Once again I wont waist time with idiots like you.

[Guest]

all you have to do is provide the details of how the two cranks failed. how hard is that?

[Typhoon]

I dont "have" to do anything.

I tell you what, if you ever know of anyone that breaks one make sure they share the info.

As for me, the information I have is not mine to share.

[tab]

As for me, the information I have is not mine to share.

And fair enough

Pull your head in Esky, no need for you to ruin yet another thread with your dribble.

[DUS12]

if 2 cranks have failed at over 500kw I dont believe its because of weakness or build quality of the crank, I believe it would have been a issue with the motor or tune,

[Guest]

More then likely due to increasing rev limit after the bigger turbo was installed I'd say

These cranks are only balanced to a certain point...

Edited 13/03/09 05:27 AM by 03XR6T

[tab]

If you clowns can’t keep to the topic without slander or piss-taking, implied or otherwise, then we’ll just have another topic locked.

Up to you.

[HIPWRED]

I've broken a v8 crank at much less than 500rwkw. probably half that. But, that was due to a failed harmonic balancer. It didnt mean the crank was weak by any means.

Many (poor) engineering practices can weaken a crank... not enough radius 'fillet' on journal grinds can create stress risers. Even things like incorrect input shaft alignment on the gearbox - too much runout will set up a harmonic that will break a crank in no time.

So, I would have to say that with such vague information its hard to say that the structure of the crank is a weakness.

For the record, I've got 420rwkw on a stock typhoon's engine internals (well- with only upgraded valve springs). I didnt have to spend 50k, and I think with 2k on a turbo upgrade (from stock!), 500rwkw would have been easy - if I wanted to risk it with stock internals. Blowing a lot of money and losing 2 cranks doesnt necessarily mean you know what you're talking about, unless you're implying you learn from your mistakes. I think what some people are implying here, however, is that you didnt.

I tend to agree with the others... sounds more like bad tune or possibly dud parts or assembly.

But yes we are all digressing... the topic is about where I can get a STEEL crank

Leigh

Edited 13/03/09 07:35 AM by HIPWRED

[01txr]

I have had a Ford 4.1 Crossflow crank shear off just behind the timing chain.

What I put it down to was how I would always give it quick hits to WOT and off.

hence causing the timing chain to pull tight and then go slack, causing stress and flex

to the crankshaft.

This is also common with supercharged cars that run crank supports.

I use to rev the 4.0 regularly to 7000rpm, lasted just over 1 year before breaking the crank.

These crankshafts where also prone to flexing due to the length which I would say

our 4.0 cranks are to but maybe nowhere as bad due to engineering inprovements in design and material.

Hope that may help with some insight into how cranks can break.

If someone chooses not to share any info so be it, that's there choice, just be greatful when they do

and appreciate it. not everything is gospel, also everything is always different for the next person or variable.

if people are knocking anything and everything people say then who will give out info.

back on subject let us all know how you go with Craig Brown on weather he can build crankshafts for us guys

or not.