Sprocket failure

[Flaco1]

I just wanted to post up my sprocket failure being that I haven't seen it much on here or I might of missed it. When I had my motor built they where not on the market. Until a couple of months later after installing of the motor in the car they came out. But I figured I would just run with it. Big mistake. Split the sprocket at the track at high rpm almost about to finish the 1/4 mile. It sucks but a costly repair its going to cost me. Broken sprocket, bent all the valves, damage the crank and cams a little and hopefully I can get them polish and take of that, and broke 16 rockers.

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[Bud]

Oof, that sucks, sorry to see it man. What cams and valve springs were you running? And power adder?

 

[Flaco1]

Have boss heads, valves, and springs with a 2.9 Whipple.

 

[SignalZero]

Looks like I'll be ordering a billet gear

 

[4VFTW]

ouch, sucks to see , sorry man

 

[Bud]

Have boss heads, valves, and springs with a 2.9 Whipple.

Have stock cams? Man I was thinking that maybe it was heavier cams and spring pressure causing that piece to go. If it is going with stock stuff (boss springs) that is a tad scary.

 

[nowwhat]

Thanks for posting. I wasn't going to include them in my build, but now I am.

 

[Tron84]

Ouch! I wish they had this out last winter when I built my motor. Then again, there are tons of cars out there making big power on the stock sprocket with no issues. Probably takes a combination of some things all happening at the wrong time to do it.

 

[Flaco1]

Ouch! I wish they had this out last winter when I built my motor. Then again, there are tons of cars out there making big power on the stock sprocket with no issues. Probably takes a combination of some things all happening at the wrong time to do it.

I thought the same thing when I saw the gears first came out and I figure there where a lot of people making good power. So I took my chances and car ran strong for a over a year with no problems. Now it's going to cost me at the least 2k just in parts and good thing I'll doing my labor for the most part for a $300 part. There where no signs at all. Just heard a pop while running and that's all she wrote.

 

[oldbones]

Dang, that sucks....Lost my crank on my whippled cobra and the carnage was just as nasty.

 

[Blazer707@TBR]

I will be getting this gear when the times come!

 

[throthaduece85]

what kinda rpm were you turning when all this occurred?

 

[Flaco1]

what kinda rpm were you turning when all this occurred?

6500-7000

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[BoostedGT217]

Carnage

I wonder since it has a whipple.. if the added tension is putting more stress on the snout??

 

[Aaron@JPCRacing]

Yea that happens.

 

[RAZRS EDGE]

I wonder since it has a whipple.. if the added tension is putting more stress on the snout??

All superchargers, being that they're belt driven, put a higher load on the crank snout and front main bearing.

 

[BlueSmokem5.0]

That's a damn shame OP !! I built my engine this summer and that was one of the parts I ordered for my engine build even though there were people saying that's not necessary unless your spinning over 7500rpm. I see now its cheap piece of mind!!!

 

[cb900f]

Damn Flaco, sorry to hear about it. :-/

 

[AZBOSS]

OUCH. Got an MMR sprocket sitting in a box for my upcoming build...

 

[Racered11]

Mine broke into 3 pieces at road america, on a completely stock engine...doing touring laps in between races