Timing Sprocket Failures

[Dolsvt00]

I was on E85. It is very very hard to detonate E85.

Correction* Its very hard to get audible knock on e85, If you think you its hard to get detonation E85 your sadly mistaken.


Vibration is the killer its just like those guys with trinity's that snap cranks. You're a fool if you think you can slap some damper on the crank and everything is ok. If you swap dampners and even flexplate or flywheel the engine should be internally ballenced with those parts.

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[Reds197]

I understand all the specifics behind E85. It is much more knock resistant than 91 octane. My point is at 3000 RPM on E85 and 16 degrees of timing the detonation explanation for breaking timing gears is not what happened in my case.

I also had a twin pump fuel system so no way in hell it was lean. I have several data logs that show how dialed in the tune was.

 

[Mod Mustang Racing]

Great deal below for those looking - Combo package of Timing Gear and Oil Pump gears for $589.98 from MMR :

http://www.modularmotorsportsracing...page=product_info&cPath=26_27&products_id=269

 

[pwnall1337]

I understand all the specifics behind E85. It is much more knock resistant than 91 octane. My point is at 3000 RPM on E85 and 16 degrees of timing the detonation explanation for breaking timing gears is not what happened in my case.

I also had a twin duel system so no way in hell it was lean. I have several data logs that show how dialed in the tune was.

Usually low rpm wot operation creates a higher engine load which increases detonation risk. You should do a wot pull on your new car and data log engine load and you'll see what I'm talking about.

 

[Reds197]

Usually low rpm wot operation creates a higher engine load which increases detonation risk. You should do a wot pull on your new car and data log engine load and you'll see what I'm talking about.

I have 75 plus WOT logs from both cars and 600 plus from 3 previous coyotes.

Look at the MMR gear. Mine broke right on the key way. Look how thin it is and then imagine it spinning at 7500. That is why I have Billet gears.

 

[pwnall1337]

I have 75 plus WOT logs from both cars and 600 plus from 3 previous coyotes.

Look at the MMR gear. Mine broke right on the key way. Look how thin it is and then imagine it spinning at 7500. That is why I have Billet gears.

For the purpose of science do you mind sharing one of the logs that was closest to the failure event on datazap.me?

 

[Reds197]

Its Lund tuned in person by KenB. The tune is spot on.

 

[Roh92cp]

I have 75 plus WOT logs from both cars and 600 plus from 3 previous coyotes.

Look at the MMR gear. Mine broke right on the key way. Look how thin it is and then imagine it spinning at 7500. That is why I have Billet gears.

Reds I don't think anyone is doubting your gear broke and that you experienced the absolute worst case scenario, but why it happened ??? Look... of course it's cheap insurance to anyone racing and bumping of the the rev limiter and such to replace. But you are kinda implying that hey, this could happen to anyone even at 3k, it's a ticking time bomb!

Hundreds and hundreds are running without with no issues, Travis at boost works says he has done in the hundreds over 5 years without failure.

Again not saying your wrong, and it didn't happen to you at 3k, but possibly when you were racing along the way and from reading you broke other parts trans year end and such, maybe the gear got damaged earlier. :shrug:

 

[pwnall1337]

Reds I don't think anyone is doubting your gear broke and that you experienced the absolute worst case scenario. By why it happened ??? Look of course it's cheap insurance to anyone racing and bumping of the the rev limiter and such. But you are kinda implying that hey, this could happen to anyone even at 3k, it's a ticking time bomb!

Hundreds and hundreds are running without with no issues, Travis at boost works says he has done in the hundreds over 5 years without failure.

Again not saying your wrong, and it didn't happen to you at 3k, but possibly when you were racing along the way and from reading you broke other parts trans year end and suck that maybe the gear got damaged. :shrug:

I just want to see one of the data logs since he has so many. My intention is not to intimidate. My intention is to get a better understanding of how the car looked.

 

[Dolsvt00]

I dont doubt one bit that the sprocket is one of the weak links. But I will say that there are other equivalent weak links that given the right conditions will fail equally.

 

[Reds197]

I am just informing everyone of exactly what happened so they can make their own decision. The Whipple American Muscle car had the exact same issue.

As I said earlier I have had 3 other 650+ coyotes and only installed the oil pump gears and used the stock timing gear with no problems. I assumed the timing gear was fine just like everyone else until it happened to me.

 

[gsxr1300]

I didn't want the added expense but I did it because I would be pissed if it broke and took out my motor because I didn't do it.
My mustang id my daily driver and IF it broke I would lose alot more money than the gears cost.

 

[evo8904]

I swapped my opg and timing gear for MMR gears. I did it for the extra piece of mind since I beat on my car.

 

[zaquhree]

[MENTION=11845]evo8904[/MENTION] who did your OPG/and timing gear?

 

[evo8904]

[MENTION=11845]evo8904[/MENTION] who did your OPG/and timing gear?

Collin at http://www.racingintegration.com

He did a great job and was extremely quick.

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