I think I done blown somethin up ^_^ - Page 4 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 09-24-2009, 09:03 AM   #61
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Build it back better, Peace of mind of having a tank of an engine leaves lots of headroom. If your setup is maxing out the stock bottom end.... then it will happen again. Dont turn down the boost, turn up the boost.

Goodluck
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Old 09-24-2009, 09:06 AM   #62
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Ouch.

If I could go back to last November when I had my motor out...knowing what I know now...I would have put a built motor back in.

Of course I'm also the scaredy cat that turned my timing table back a few degrees last night until I get the WI on.
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Old 09-24-2009, 09:26 AM   #63
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So where are the pics of the head? How do the valves look? Any appear to be stuck open?
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Old 09-24-2009, 09:29 AM   #64
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Welcome to the melted piston club.

my #4:



no coolant reroute.
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Old 09-24-2009, 09:34 AM   #65
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Quote:
Originally Posted by ArtieParty View Post
So where are the pics of the head? How do the valves look? Any appear to be stuck open?
No pics of head. I'll snap later. All valves and everything on the head appears to be normal. All close as they should.
Why, do you think this might have FUBAR'd the head as well?
Quote:
Originally Posted by Braineack View Post
Welcome to the melted piston club.
my #4:
[IMG]http://www.boostedmiata.com/blown_engine/bad_rings/melted_piston002.JPG
no coolant reroute.
Thanx, can't say I'm glad to be a part of that kind of club though.

BTW, are you saying that this is caused by not having a coolant re-route?
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Old 09-24-2009, 09:47 AM   #66
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I dunno what happened; 98F day out, drove to lunch and took a log, no problems. Met up with SamNavy, he drove it around the block, felt nice. Then when I drove home I got into boost and saw my oil gauge go wacko and let off the throttle. Continued to drive for a few minutes where I had to stop for the left turn into my work. Motor stalled when I hit the clutch. Got it started after maybe 30 minutes of sitting while waiting for AAA and it started dumping smoke but I limped it home about 5 miles. I had low compression on all cylinders and almost none in 3 and 4.

I swapped out the block and it ran strong for more abuse another 2 years.
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Old 09-24-2009, 10:11 AM   #67
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Damn sorry it wasn't just a head gasket. I wonder how it caused your coolant line to spring loose?

The pieces of the piston had to go somewhere. I hope your turbine fins look good. Did you check them yet?

Maybe you could trade the hardtop with somebody for forged rods and pistons.

Good luck.
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Old 09-24-2009, 10:22 AM   #68
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even a built motor cannot survive detonation. I think you should copy the motor savington, the snowboarder, and I built, tune it properly and keep it forever.

This is where low compression comes in. I had 34* of advance at 15psi/4400rpm on steady-state pulls last week to find MBT. We wen't up to 37* and still had no detonation. So I dropped it to 32*so its safe and happy. That's safety from detonation that you can't get anywhere else. So yes, my compression is too low, but its safe and still fast as hell.
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Old 09-24-2009, 11:25 AM   #69
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I am heavily considering my options. I will go raid some junk yards for a block this week, if I don't get crazy deal on one or they are all old raped crap then I will consider building.
The main thing keeping me from going built just yet is the fact that:
1) Its a street car that I don't beat on very often.
2) There is absolutely no reason for it not to handle the power level its at right now.
3) money money money

Just inspected the turbine: its absolutely fine.
Have no idea where the broken piece went.

I'll be pulling the block this weekend and have some pictures of rods and what not.
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Old 09-24-2009, 11:49 AM   #70
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Quote:
Originally Posted by 18psi View Post
Just inspected the turbine: its absolutely fine.
Have no idea where the broken piece went.
From the picture, it looks more like the missing section of the piston melted, rather than breaking off in a coherent chunk. Is that the case?
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Old 09-24-2009, 11:52 AM   #71
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I don't know to be honest. I doesn't look broken off or ripped out, so you are probably 100% correct.
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Old 09-24-2009, 11:54 AM   #72
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why i said welcome to the melted piston club....hello, Bueller?

Quote:
Originally Posted by 18psi View Post
3) money money money

fwiw all this in the picture cost me a whopping $220 shipped. that included $70 for premium rings.

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Old 09-24-2009, 11:57 AM   #73
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I meant money for forged stuff.

bellfab rods/pistons -835
rod/main bearins -95
gasket set -135
arp studs -130
etc stuff -300

It adds up.

That is why I am planning to hit up a local scrap yard, hopefully find a good short block, put new gaskets/seals/etc on it and run it like that. If I don't find one I'll do the build. I want to build a bulletproof engine so bad. Unfortunately we don't always get what we want. Sometimes we have to settle to keep stuff like a house and a marriage
And about the melted piston club, I'm just sleepy as hell so my mistake
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Old 09-24-2009, 12:03 PM   #74
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Quote:
Originally Posted by 18psi View Post
I meant money for forged stuff.
They are calling your name.

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Old 09-24-2009, 02:22 PM   #75
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What type of fuel rail do you have?
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Old 09-24-2009, 08:45 PM   #76
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stock
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Old 09-24-2009, 08:57 PM   #77
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I wonder if an aftermarket or diy dual feed rail would have helped in this situation.

Although im thinking the motor had some abuse before you got it. You did say it was boosted before, right?
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Old 09-24-2009, 09:17 PM   #78
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Yes. And he beat the **** out of it.
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Old 09-24-2009, 09:54 PM   #79
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Gl finding a junkyard motor. Thats the way to go right now for you, imo. You can always build a motor later.. sounds like you just got a beat up **** of a motor.

At least you got a killer deal on the car..
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Old 09-24-2009, 09:55 PM   #80
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Quote:
Originally Posted by Fireindc View Post
I wonder if an aftermarket or diy dual feed rail would have helped in this situation.
No.
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