Ken,

I haven't gotten the tensioner yet.. I am going to do it, just haven't had a chance yet.. Oh well, soon enough I guess.. I asked for pics a few weeks ago and didn't get many replies..

--Sean

Actually, there has only been one broken crank snout....... the one belonging to 1LEThumper. The other one mentioned in his previous post, and the one claimed by james007moore are the same one, and were in fact a failed dampner, not a crank problem. I know this because i built his engine about 3 years ago, and he contacted me thinking the snout had broken. He then called back a few days later explaining what he found upon disassembly. Between his first call and his second, I had already been in contact with Callies, which was at the same time of 1LEThumpers problem.
Here's a link to pics & explanation of 1LEThumper's crank breakage, as it's at my shop, and has been thoroughly examined by Duane Boes at Callies. He's a design engineer, and has a lot of experience at failure analysis.
http://www.nu-tekmotorsports.com/cus...20cars%202.htm
Hope this helps clear things up a little.
Nick Norris

Thanks Nick

I appreciate you taking the time to clear that up. One hopes that 'thumper' was a one of situation then.

Of course then I have to find out about the dampener problem. LOL

Thanks for posting the pic up Nick, I have been meaning to do that for a long time now but since I'm about 1000miles away from school, and the car its hard to do.

It isn't much of an area that came into contact with the crankshaft but it does cause a pretty big stress risor there.

Callies did a very good job of working with me on sorting out the problem with the crank and what happened to it as a result. Nick was/is extremely helpful in getting the whole mess sorted out and back together. Hopefully it doesn't happen again.


Like I said this was my first blower/stroker combo that I had done by myself and I didn't think that there would be a problem there. I knew that the bearings needed to be chamfered but I didn't know on the timing gear.

Oh well live and learn I guess.



I agree on the damper stud as well, Nick. I had a 8" stud in the crank before and it went out to the damper but I didn't have a washer and nut all the way out to the blower pulley itself. This time with the ATI damper, and longer stud and new belt setup I hope to get rid of a lot of the problems that was going on with it before.

Anthony what did your break? Where you on it showing off like me

I had my buddy over who also has a SC Tahoe and we drove his first then mine...we was video mine when it let go...if you listen carefully you can he it let go right at the end of the video!

http://204.250.250.27/kctrading/96K1...ing-engine.mov

He was almost in tears when it went...but I told him it would of let go if not now the next time I got on it.

Also funny thing is that it had a bit of ping when I first took off and it never did that before with the huge intercooler that I have...it was also a little down on power on that run as we also had a Tazzo hooked up (like a g-tech) to checking the 0-60mph

Ken

No, I wasn't showing off. The car was way out of tune to be showing off.

I had been cruising around that night trying to get the driveablity worked out on it.

It broke going about 30mph and 2500rpm, nothing more. It was about 1am and I was trying to keep it quiet driving home.

Wow! it must of been partially broken and finally broke...when looking at my crank it almost looks polished in 2/3 of one area with the other 1/3 rough.....

Reminds me when I had my 1968 GTO with a 400 engine and the nylon timing teeth decided to let go at idle mine you....and bent every valve in the engine! Guess it could of been worse and let go at red line

Did ATI ever say anything about the shaft breaking off on there supercharger? I've never heard of one breaking....did you get any pics on it?

Also thinking of getting an extra key in the crank and dampner...what do you guys think?

Ken

Just asked me what happened to it that was about it. From the outside about the only thing you could tell was that the center bolt holding the blower pulley on was gone.

Yeah I know what you mean about those timing chains....dad had it break on his '70 GTO, boy if that wasn't one of better ideas GM had

Update:

Here is what I have decide to do to keep the crank snout from breaking again...

1. use a 4340 steel crank
2. double key the crank and dampner
3. Street fluid dampnr
4. Switch from two belt system to a single sc belt accessory system....you can buy a brand new bracket installation kit from vortech for $221...I have one on the way ...this also gets rid of 5 lbs of extra rotating weight and keeps the leverage off the crank nose.

Ken

I elmininated any possibillity of crank snout breakage completley with one word,,,,,, turbo hehe.

Mike

I'd love to go with twin turbos if they made a kit that was calif. smog legal!

Ken

Mine was a stock single keyed crank broke right at the radius:

http://64.246.6.99/~admin6/forum/sho...threadid=39997

Ken

Ken,

Damn, just looked at your sig on that other forum. You got that big huge truck to pull a 14.1@95mph, that's pretty impressive really! I bet you've surprised more than a few quick cars eh!

Mike

Should be in the low 13's to high 12's once I get the 383 installed

I would of perfered a lite weight car with the engine in it but I can only afford one...can do just about anything in the 4x4 truck and haul 6 people to boot

Ken