Yeah. Not cool. Extended keyways for erryone.

 

I know a few of you have sheared that key, but it's not even something zzp pushes or really see on their builds. Scythe Snake, Cmiller ect I don't believe have ever had an issue like that. Not that I know of anyways.

 

You're right, they don't have the extended keyway..

But, is it worth the risk?

 

If the motor is together and solid, I'd say leave it, but thats just me. If it shears off you will wish you took it apart and extended it, and if you take it apart and re-assemble and have an issue you will wish that you left it alone. Damned if you do and damned if you don't.

 

hmm.. why would you have an issue reassembling?

 

Why could anything happen? Sometimes things happen. It could blow up next time he starts it or it could run for 10 years at 600whp, who knows. And then you'd wanna re-ring it and quick hone it again too if you took it apart. Its his call. I just know what I'd do, but its not my build.

 

Don't get me wrong it's a great idea if you are building a motor. Is it worth tearing a motor down just to do it? No I don't think it is IMO unless you actually have a key shearing issue. Replacing all tty bolts and gaskets to do. It's just not a common failure. Seems to be more prone with guys who have blowers. That I've seen anyways.

 

Ohhhhhhhh you meant something else happens shortly after doing the crank and you gotta rip it apart anyways. okay gotcha.

 

Agreed. I'm not saying dont do it when building. Just the fact that its together and seems to be solid. "Let it ride!" comes to mind lol

 

What keyway is this you speak of? For an oil passageway or something?

I just bought my ati and zzp machined front cover thats all i got to run it so far and i gotta keep adding stuff to my list to keep on top of things lol

 

If the key strips then you have no oil pressure, just put it that way. Your not built so if it strips in a year or two and you don't boom by then you can just build and it wouldn't be too big of a deal.

When I rebuild "hopefully in a few years" and the crank is out, yes I will have the key extended. But for now I think I've decided to take the gamble and just let er eat

 

ATI damper seems to reduce the need for the extended keyway due to the interference fit, and also the hardened oil pump gears due to less crank pulley expansion on the oil pump
gears

 

Agreed. Definitely helps things.

Even if you did twist the key off the pressed fit of the ati would probably still be enough to keep the pump turning. Limping that is.

 

I thought the only time people extended them was when running an ATI?

 

No. Stock damper or ATI it sits the same amount on the key way. Just the stock sliders right on where the ati is a pressed fit.

 

And thats why I need a heat gun? Why did no one tell me about this when I was building it for 6 months?!

 

Heat gun for what..........?

 

I plan on turning some rpms and the wheels are already in motion for buying internals so I'll be extending the keyway

 

I was told to heat the area where it slides on

 

EW. don't know if i like that idea.

Longer bolt, press it on just like anything else... Just be extra, extra extra sure its lined up wit the oil pump..

or to be the most sure it's lined up, take the timing cover off, put the ATI in the timing cover, press the ATI on with the timing cover already on it.

 

ATI suggests one way to put it on his use a heat gun on the centre where the crank slides on and slip it on. Done it twice now. Works like a charm.

 

Timing cover will be coming off to put in ARP timing bolts so I'll probably do that

 

My way is easier

 

I don't even have it in my hands yet, so it's hard to picture what everyone is saying

 

yea be careful that everything is in line when you start to press it on, If it isnt lined up, you will destroy the oil pump gears and the key. I have seen it done. check twice, install once

Even with it being pressed on I would worry about it slipping if the keyway breaks, the amount of resistance that you will be seeing on the pulleys at a high rpm may be enough to cause it to spin much slower than the engine