Turbo installed. Lasted 4 days. Threw a rod.
#41
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Right I've taken the head off and removed the piston through the top by super glueing a little sucker on the top of it.
Here are pics.
Pic of no:4 straight after I removed the head. The piston has hit the valves in the head.
![](https://www.miataturbo.net/attachments/general-miata-chat-9/121577-turbo-installed-lasted-4-days-threw-rod-5fc8bb9a-5c44-4d80-9405-68e41d8defb5.jpg?dateline=1408965497)
No:1
![](https://www.miataturbo.net/attachments/general-miata-chat-9/121578-turbo-installed-lasted-4-days-threw-rod-d70aaacf-8bbe-41b4-b228-53095c37214e.jpg?dateline=1408965497)
No:2 & No:3
![](https://www.miataturbo.net/attachments/general-miata-chat-9/121579-turbo-installed-lasted-4-days-threw-rod-6fbd19f5-53a5-4835-866d-b61205072c99.jpg?dateline=1408965497)
Mangled rod:
![](https://www.miataturbo.net/attachments/general-miata-chat-9/121580-turbo-installed-lasted-4-days-threw-rod-ac617787-15b7-420b-bd4e-f6eebf7248ac.jpg?dateline=1408965497)
The bit of rod left on the crank spins perfectly smooth so I don't think this is bearing related.
Once I've got the block out I'll remove the sump and take a look at the bearings in what's left of the rod.
Here are pics.
Pic of no:4 straight after I removed the head. The piston has hit the valves in the head.
![](https://www.miataturbo.net/attachments/general-miata-chat-9/121577-turbo-installed-lasted-4-days-threw-rod-5fc8bb9a-5c44-4d80-9405-68e41d8defb5.jpg?dateline=1408965497)
No:1
![](https://www.miataturbo.net/attachments/general-miata-chat-9/121578-turbo-installed-lasted-4-days-threw-rod-d70aaacf-8bbe-41b4-b228-53095c37214e.jpg?dateline=1408965497)
No:2 & No:3
![](https://www.miataturbo.net/attachments/general-miata-chat-9/121579-turbo-installed-lasted-4-days-threw-rod-6fbd19f5-53a5-4835-866d-b61205072c99.jpg?dateline=1408965497)
Mangled rod:
![](https://www.miataturbo.net/attachments/general-miata-chat-9/121580-turbo-installed-lasted-4-days-threw-rod-ac617787-15b7-420b-bd4e-f6eebf7248ac.jpg?dateline=1408965497)
The bit of rod left on the crank spins perfectly smooth so I don't think this is bearing related.
Once I've got the block out I'll remove the sump and take a look at the bearings in what's left of the rod.
#42
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Here's the launch in normal speed.
I held it on launch control until I saw the boost rise on the gauge the let it go and released the clutch. I'm pretty sure it was a full boost when I let it go or at least very close.
So maybe it just couldn't take a full boost launch? And there's nothing wrong with the tune?
I held it on launch control until I saw the boost rise on the gauge the let it go and released the clutch. I'm pretty sure it was a full boost when I let it go or at least very close.
So maybe it just couldn't take a full boost launch? And there's nothing wrong with the tune?
#43
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can you show pics of the head in a similar manner?
Looks like a big chunk of piston is missing on #4 on the intake side and some det on the exhaust side of it. And maybe some contact with valves.
Lots of compression getting past the rings, but unsure if that was before or after boom. Probably will find a cracked ringland on the piston.
All four show it was running pretty rich, as the pistons are steam cleaned from the fuel.
#44
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Full boost as in I watched the gauge get to just under 1 bar before I let it launch.
Can't post the tune until I get it off my mapper
The head does have marks on the valves where the piston has hot the head. The engine made good compression a couple of weeks ago.
Also I have the no:4 piston out and there are no signs of cracked ring lands or anything that I can see
Can't post the tune until I get it off my mapper
The head does have marks on the valves where the piston has hot the head. The engine made good compression a couple of weeks ago.
Also I have the no:4 piston out and there are no signs of cracked ring lands or anything that I can see
#45
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Really interested in hearing more feedback/opinions and seeing that tune.
I'm certainly no expert, but those pistons don't look bad to me at all, definitely not like I've seen from other motors that met an early demise. I assume we can ignore the valve marks on piston #4, none of the other pistons show any damage and with an exploded rod it seems pretty inevitable that there would be a collision.
I'm certainly no expert, but those pistons don't look bad to me at all, definitely not like I've seen from other motors that met an early demise. I assume we can ignore the valve marks on piston #4, none of the other pistons show any damage and with an exploded rod it seems pretty inevitable that there would be a collision.
#46
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The problem is, it still could have been knocking badly, and you wouldn't see it too much since he's only had the car running 4 days. So while I agree the rest of the pistons don't look too bad, we still can't rule that out.
But for all we know it could have even been a seized injector that flooded the cylinder and hydrolocked it.
Sitting on the 2 step and building just under 1 bar is putting some serious stress on the engine. Even built engine cars I've worked with don't do that.
Serious heat and load from sitting on the 2step + possible flood from cutting fuel and spark = boom?
But for all we know it could have even been a seized injector that flooded the cylinder and hydrolocked it.
Sitting on the 2 step and building just under 1 bar is putting some serious stress on the engine. Even built engine cars I've worked with don't do that.
Serious heat and load from sitting on the 2step + possible flood from cutting fuel and spark = boom?
#48
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I personally think the tune is fine and that the launch control was just too much. I am still confused as to why it made such lower power for the psi the turbo was producing though.
#50
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The motor made great compression and ran perfect before the turbo. It also ran perfect with the turbo. No smoke, no rattles, no knocks. I had my local engine builder (who built the bottom end) take a look at it and he said the pistons look great. The tune appears ok but hard to tell from just 4 days. He thinks the rod simply couldn't take the stress from the launch control simple as that.
I personally think the tune is fine and that the launch control was just too much. I am still confused as to why it made such lower power for the psi the turbo was producing though.
I personally think the tune is fine and that the launch control was just too much. I am still confused as to why it made such lower power for the psi the turbo was producing though.
These statements are contradicting.
#53
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You're gonna get seriously flamed if you keep saying stupid stuff like: " It didn't go up in a burst of fire on startup, and I was told it was tuned good by the guy I paid to tune it, therefore it ran perfect and was tuned perfectly"
I mean seriously.......stahhp
*edit: and I keep forgetting to mention that if you really have a 4.65 Final drive, your 1st gear is semi-truck long, meaning you probably didn't load up the engine that bad after you actually launched it.
I mean seriously.......stahhp
*edit: and I keep forgetting to mention that if you really have a 4.65 Final drive, your 1st gear is semi-truck long, meaning you probably didn't load up the engine that bad after you actually launched it.
#55
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if your going to ask for help you need to keep an open mind. don't be an ask hole or you'll need a flame shut....
Shamess plug--> fire suits available at OGracing.com :P
I don't know much about BP motors, but if you messed up a rod it happened from pre-ignition. Ie two cylinders firing at once. things that can cause this, too lean, excessive spark advanced, elevated cylinder temp, faulty coil wiring ect...ect...ect . post pictures of the cylinder head and spark plug. that will have evidence of Pre ignition.
Shamess plug--> fire suits available at OGracing.com :P
I don't know much about BP motors, but if you messed up a rod it happened from pre-ignition. Ie two cylinders firing at once. things that can cause this, too lean, excessive spark advanced, elevated cylinder temp, faulty coil wiring ect...ect...ect . post pictures of the cylinder head and spark plug. that will have evidence of Pre ignition.
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Your Source For Motorsports Safety Equipment
WWW.OGRACING.COM
800.934.9112
703.430.3303
info@ogracing.com
Last edited by curly; 08-25-2014 at 10:50 AM.