Crank keyway ????

[XR8tt]

Has anyone had issies with harmonic ballancer breaking the key on 1UZ crank???
They look very suspect on modified engine...
I will be machining a longer grove in crank snout with longer key...
I know some "modiified" 2J GTE's stripping keyway...
It from memory the key retains timing gear and ballancer...
The ballancer is the least of problems, but the timing gear is a worry!!!!

 

[rms]

I think it is more a matter of the retaining bolt not being torqued up.
People have suggested 'just hit it with a rattle gun' or 'hit the spanner with a hammer'.
Torque to 245 Nm.
Toyota don't specify that amount of torque just to stop it coming undone !

 

[XR8tt]

On a 600 h.p pluss drag engine, Where it revs hard to 8,000rpm real quick
I don't like the idea of my expensive billet Kelford cams being mangled...
A few guys that race and build these engines say its another mod they do while engine is being race prepared...

 

[XR8tt]

This guy helps me out on tech stuff etc...
Powerd by 2J ...
http://www.youtube.com/watch?v=m3GYxfldYs8

Quicker...

http://www.youtube.com/watch?v=NXK9t_gGbXw&mode=related&search=

 

[Lextreme II]

I think you will be fine.

 

[rms]

Camshafts will be the least of your worries if you shear the timing gear key!

We do not run a harmonic balancer, toothed belt drive to alternator and dry sump pump, belt tensioner is locked solid. So far so good after 3 hours running to 9200 rpm.

 

[XR8tt]

Camshafts will be the least of your worries if you shear the timing gear key!

We do not run a harmonic balancer, toothed belt drive to alternator and dry sump pump, belt tensioner is locked solid. So far so good after 3 hours running to 9200 rpm.

Yea not wrong about valve gear!!
Comparing the keyway to other motors the key looks a little short...
Especially in drag racing where there's a some decent shock loading, one I know has had issues was on supercharged boat motor. But again there's heaps more load in that area with s/c....
In all cases yes bolt may not have been torqued correctly...
Its just an area that needs checking, as with any modded engine...
It's not a design fault, its just the extreme power we put through them...

 

[Zuffen]

The sheer stength of a 6" nail is 5 tonnes.

A 6' nail is around 5mm in diameter.

Think of the sheer strength of a solid piece of steel the size of the woodruff key.

 

[XR8tt]

I won't be using a nail.. Its modded with longer key now..
The issue maybe when not torqued correctly or the interferance on crank is lost due to being taken on & off too often..
The cranks etc get hard time with transbrake, launch control etc....
Normal road use won't be an issue...

 

[bigblockford545]

On supercharged dinosaur v8s it is common to machine a second key way for a 1/4" key 180' from the original. You can buy blower harmonic balancers with the key way already machined in it.

This is exactly what I did for my blown big block Ford setup.

have fun

Simon