Time for a new engine? - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Prefabbed Turbo Kits A place to discuss prefabricated turbo kits on the market
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools
Old 04-15-2008, 12:42 PM   #21
Elite Member
iTrader: (3)
 
Join Date: May 2006
Location: Houston, TX
Posts: 2,900
Total Cats: 0
Default

Umm, for a spark plug to bend like that something has to hit it.
Arkmage is offline   Reply With Quote
Old 04-15-2008, 02:29 PM   #22
Senior Member
Thread Starter
iTrader: (7)
 
nicacus's Avatar
 
Join Date: Jul 2006
Location: SLC UT
Posts: 1,133
Total Cats: 0
Default

If the rings are bad wouldn't it make some sort of horrible noise??
would a leakdown test be a wise?
nicacus is offline   Reply With Quote
Old 04-15-2008, 02:31 PM   #23
Senior Member
Thread Starter
iTrader: (7)
 
nicacus's Avatar
 
Join Date: Jul 2006
Location: SLC UT
Posts: 1,133
Total Cats: 0
Default

Quote:
Originally Posted by Arkmage View Post
Umm, for a spark plug to bend like that something has to hit it.
Thats what I was thinking, but it doesnt look like anything hit it on the bottom.
It looks more like it got too hot and bent.. that wouldn't make sense either though, why would it bend up???
nicacus is offline   Reply With Quote
Old 04-15-2008, 02:55 PM   #24
Elite Member
iTrader: (3)
 
Join Date: May 2006
Location: Houston, TX
Posts: 2,900
Total Cats: 0
Default

Quote:
Originally Posted by nicacus View Post
If the rings are bad wouldn't it make some sort of horrible noise??
would a leakdown test be a wise?
Bad rods/bearings make a lot of noise... bad rings just burn a lot of oil.

I highly recommend a compression and leak down test to see what's going on... I suspect you may have cracked a ring land and a chunk of piston hit the spark plug. Something had to have hit it to bend it like that.
Arkmage is offline   Reply With Quote
Old 04-15-2008, 03:34 PM   #25
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,892
Total Cats: 1,792
Default

Quote:
Originally Posted by Arkmage View Post
I highly recommend a compression and leak down test to see what's going on... I suspect you may have cracked a ring land and a chunk of piston hit the spark plug. Something had to have hit it to bend it like that.

This was my thinking as well....
Braineack is offline   Reply With Quote
Old 04-15-2008, 05:13 PM   #26
Senior Member
Thread Starter
iTrader: (7)
 
nicacus's Avatar
 
Join Date: Jul 2006
Location: SLC UT
Posts: 1,133
Total Cats: 0
Default

Ok, I am going to do another compression test right now.
If there was someting in the motor bouncing around wouldnt I hear it?
nicacus is offline   Reply With Quote
Old 04-15-2008, 05:19 PM   #27
Senior Member
Thread Starter
iTrader: (7)
 
nicacus's Avatar
 
Join Date: Jul 2006
Location: SLC UT
Posts: 1,133
Total Cats: 0
Default

Here's another "fun" picture
IMG_7256.jpg
nicacus is offline   Reply With Quote
Old 04-15-2008, 05:25 PM   #28
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,892
Total Cats: 1,792
Default

been there done that:

Braineack is offline   Reply With Quote
Old 04-15-2008, 06:14 PM   #29
Senior Member
Thread Starter
iTrader: (7)
 
nicacus's Avatar
 
Join Date: Jul 2006
Location: SLC UT
Posts: 1,133
Total Cats: 0
Default

Ok I ran the compression test:
this time the engine was warm and I had the throttle wide open
1 -156
2 -157
3 -160
4 -160

That isnt bad is it??
nicacus is offline   Reply With Quote
Old 04-15-2008, 06:32 PM   #30
Elite Member
iTrader: (15)
 
patsmx5's Avatar
 
Join Date: Aug 2007
Location: Houston, TX
Posts: 8,797
Total Cats: 248
Default

No, but you gotta run a leakdown test now. If your oil control rings are failing, you'll have the symptoms you've showed but the extra oil on the rings seals them up. Leakdown test will diagnose leaky rings.
patsmx5 is offline   Reply With Quote
Old 04-17-2008, 02:43 AM   #31
Senior Member
Thread Starter
iTrader: (7)
 
nicacus's Avatar
 
Join Date: Jul 2006
Location: SLC UT
Posts: 1,133
Total Cats: 0
Default

I started to do a leakdown test but the tester I have is bad, but it does pressurize the cylinders.

I can here air coming out of the turbo, making bubbly sounds. Does that mean the oil seals are bad?

I'll have a new leakdown tester later tomorrow, so i will know all the numbers then.
nicacus is offline   Reply With Quote
Old 04-17-2008, 03:57 AM   #32
Junior Member
iTrader: (1)
 
Join Date: Apr 2006
Location: Kirkland, WA
Posts: 239
Total Cats: 0
Default

Is it possible that you bent the plug while you were installing it? Like, too many beers and banged it on the valve cover because you missed the spark plug hole?

-Mike
grippgoat is offline   Reply With Quote
Old 04-17-2008, 08:16 AM   #33
I'm Miserable!
 
Join Date: May 2007
Posts: 589
Total Cats: 0
Default

Quote:
Originally Posted by nicacus View Post
I started to do a leakdown test but the tester I have is bad, but it does pressurize the cylinders.

I can here air coming out of the turbo, making bubbly sounds. Does that mean the oil seals are bad?

I'll have a new leakdown tester later tomorrow, so i will know all the numbers then.
here is a little info on leak down testing

http://autos.yahoo.com/maintain/repa...ques057_1.html
MX5-4me is offline   Reply With Quote
Old 04-17-2008, 01:43 PM   #34
Senior Member
Thread Starter
iTrader: (7)
 
nicacus's Avatar
 
Join Date: Jul 2006
Location: SLC UT
Posts: 1,133
Total Cats: 0
Default

The beer theory is possible, but more likely due to insomnia than alchohol.

So it's the rings then, because air couldnt get to the turbo if the rings were in good shape?
nicacus is offline   Reply With Quote
Old 04-17-2008, 01:48 PM   #35
I'm Miserable!
 
Join Date: May 2007
Posts: 589
Total Cats: 0
Default

That would be valves not rings unless the air is leaking down the rings into the block and up your oil drain.

that would require bad rings and a bad turbo oil seal, unless i'm mistaken.

Did you read that article I posted?
MX5-4me is offline   Reply With Quote
Old 04-17-2008, 02:01 PM   #36
Senior Member
Thread Starter
iTrader: (7)
 
nicacus's Avatar
 
Join Date: Jul 2006
Location: SLC UT
Posts: 1,133
Total Cats: 0
Default

Yes I did, it tells you pretty much everything the owners manual of the tester tells you and then some

The reason I figured it was the rings, is because you can hear the air coming out of the PCV valve and the breather as well
nicacus is offline   Reply With Quote
Old 04-17-2008, 02:17 PM   #37
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,892
Total Cats: 1,792
Default



you just need some JB Weld...it will fix right up.
Braineack is offline   Reply With Quote
Old 04-17-2008, 02:21 PM   #38
Senior Member
Thread Starter
iTrader: (7)
 
nicacus's Avatar
 
Join Date: Jul 2006
Location: SLC UT
Posts: 1,133
Total Cats: 0
Default

Damn.

The question now is do i re-build it or just buy another one?
nicacus is offline   Reply With Quote
Old 04-17-2008, 11:53 PM   #39
I'm Miserable!
iTrader: (5)
 
Join Date: Sep 2005
Location: SLC, Utah
Posts: 1,591
Total Cats: 0
Default

Nick, I have an extra engine just sitting in my 91 parts car, pm me and we can talk about it. I would just call, but can't find your number.
zoom2zoom is offline   Reply With Quote
Old 04-18-2008, 10:31 AM   #40
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,892
Total Cats: 1,792
Default

rebuild would be better in the long run; build it how you want. Used is cheaper, faster, easier.
Braineack is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
01-05 Fab9 PNP COPs (used) FrankB Miata parts for sale/trade 6 09-30-2015 12:48 PM
3rd Time's a Charm...hopefully. zephyrusaurai Meet and Greet 2 09-28-2015 11:59 PM
wiring wideband ground to battery terminal btabor ECUs and Tuning 10 09-28-2015 06:33 PM
VR6 to Miata Swap ScrapinMX5 Meet and Greet 8 09-28-2015 02:04 PM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 11:22 AM.