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-   -   rod stretching carnage. (https://www.miataturbo.net/diy-turbo-discussion-14/rod-stretching-carnage-36119/)

wes65 06-14-2009 08:21 AM

rod stretching carnage.
 
So, 2 days ago, my motor got over-revved. I am now following the tow truck. A rod exited the block. I was headed down a hill, I came into boost in 4th and around 10psi and 4000rpm, the motor studdered and died. The road and car behind me were covered in oil. There was no detonation. I will post up pictures later. I'm on my blackberry and I've been up all night.

wes65 06-14-2009 10:14 AM

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wes65 06-14-2009 10:17 AM

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Marc D 06-14-2009 10:21 AM

ouch. that sucks. Time for a build?

samnavy 06-14-2009 10:36 AM

I assume those are stock rods... just in time for the $299 special.
Do you have a dyno graph... or just tell us how much torque the 2860 is making for you.

wes65 06-14-2009 10:56 AM


Originally Posted by samnavy (Post 419383)
I assume those are stock rods... just in time for the $299 special.
Do you have a dyno graph... or just tell us how much torque the 2860 is making for you.

Yep. Stock. I don't know an exact number. Enough to go 12.6@112. I'm guessing 280wtq.

Joe Perez 06-14-2009 11:33 AM

Did the motor actually spit the big end of the rod completely out of the block? Don't see that one to often.

albumleaf 06-14-2009 11:39 AM

:/

Any estimate as to how high you overreved?

Joe Perez 06-14-2009 11:55 AM

This kind of thread kinda bothers me in a way. I've accidentally made the 2 -> 1 shift on two occasions. Wasn't logging either time so I don't know exactly how high I went, but it sounded interesting. And yet I still haven't expelled any rods through the side of the block. I can infer from this that either it was a really good day in the Osaka factory when my stock rods (and rod bolts) were made 18 years ago, or I'm a pussy and don't push my engine hard enough.

boileralum 06-14-2009 12:05 PM

That sucks, Wes. I have a complete 99 long block (minus throttle body/ iacv) in New Albany if you are interested.

wes65 06-14-2009 12:37 PM


Originally Posted by Joe Perez (Post 419399)
Did the motor actually spit the big end of the rod completely out of the block? Don't see that one to often.

Yep, boost in, rod out. Hopefully i can get pictures of the block. It's fucked as well as the oil pan. There is a gash that i (from what i can feel) goes from near the bottom of the oil pan to as far as i can reach behind the starter. Maybe a 5" long split.


Originally Posted by albumleaf (Post 419402)
:/

Any estimate as to how high you overreved?

Well, i let someone else drive the car.:vash: but it was an all out 1-2-1 so whatever going from 7krpm in second to first is. Maybe someone with a gearing chart for the 6 speed with 4:10's can tell us.


Originally Posted by Joe Perez (Post 419404)
This kind of thread kinda bothers me in a way. I've accidentally made the 2 -> 1 shift on two occasions. Wasn't logging either time so I don't know exactly how high I went, but it sounded interesting. And yet I still haven't expelled any rods through the side of the block. I can infer from this that either it was a really good day in the Osaka factory when my stock rods (and rod bolts) were made 18 years ago, or I'm a pussy and don't push my engine hard enough.

Yeah, i wish you the best of luck. As soon as it got overreved, i knew that something bad was going to happen. Why i decided to go 1.5hrs away and race ppl, i dont know.


Originally Posted by boileralum (Post 419410)
That sucks, Wes. I have a complete 99 long block (minus throttle body/ iacv) in New Albany if you are interested.

Hmmm, i may be interested in the head/intake. I have a bottom end already.

wes65 06-14-2009 12:41 PM


wes65 06-14-2009 01:01 PM

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magnamx-5 06-14-2009 01:15 PM

god damn man that shit will buff out :hustler: . Im sorry to here about your loss man.

Chris Swearingen 06-14-2009 01:35 PM


Originally Posted by wes65 (Post 419425)
Well, i let someone else drive the car.:vash: but it was an all out 1-2-1 so whatever going from 7krpm in second to first is. Maybe someone with a gearing chart for the 6 speed with 4:10's can tell us.

Final drive ration for 6 speed with 4.10 is
1st = 15.416
2nd = 9.3029
So assuming he dropped the clutch back in first at 7K and no lose of speed occurred during the "perfect" shift
15.416/9.3029 = 1.657 overdrive * 7000 = 11599 RPM

wes65 06-14-2009 01:42 PM


Originally Posted by Chris Swearingen (Post 419442)
Final drive ration for 6 speed with 4.10 is
1st = 15.416
2nd = 9.3029
So assuming he dropped the clutch back in first at 7K and no lose of speed occurred during the "perfect" shift
15.416/9.3029 = 1.657 overdrive * 7000 = 11599 RPM


Well, there we go. revving to 12k will make your motor pop. Who knew?

wes65 06-14-2009 02:38 PM

So, the rod bolt is mostly in tact. Does that seem strange to anyone else?

p51hellfire 06-14-2009 02:44 PM

maybe thats the fail point maybe it backed out and your rod and piston floated freely untill the crank came around and well the ignition..... idk just a thought, well time for the build, sorry about the loss there

RotorNutFD3S 06-14-2009 02:52 PM

Wow! Sorry to see that! Good luck in the ensuing project!

thesnowboarder 06-14-2009 04:00 PM

Isn't it such a great sound hearing your rod go through the block and pan?

In for many pictures when you get it out.


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