Miata Turbo Forum - Boost cars, acquire cats.

Engine Performance This section is for discussion on all engine building related questions.
Sponsored by:
Sponsored by: KPower

Well...that's suboptimal

Thread Tools
 
Search this Thread
 
Old 02-02-2018, 09:03 AM
  #1  
Senior Member
Thread Starter
iTrader: (18)
 
calteg's Avatar
 
Join Date: Nov 2006
Location: Austin, TX
Posts: 514
Total Cats: 40
Default Well...that's suboptimal
Put the free craigslist engine on a stand after low leakdown numbers. Saw an odd bulge on the side of cylinder 3. I thought it was just some gunk buildup, so I picked at it with my finger and....


tldr: unusual bulges typically don't end well.

calteg is offline  
Reply
Leave a poscat 0 Leave a negcat
Old 02-02-2018, 09:14 AM
  #2  
Elite Member
iTrader: (21)
 
rleete's Avatar
 
Join Date: Jun 2007
Location: Rochester, NY
Posts: 6,598
Total Cats: 1,263
Default
J.B. weld?
rleete is offline  
Reply
Leave a poscat 0 Leave a negcat
Old 02-02-2018, 09:21 AM
  #3  
Elite Member
iTrader: (3)
 
concealer404's Avatar
 
Join Date: Aug 2011
Posts: 10,917
Total Cats: 2,201
Default
Didn't your mother ever tell you to not pick scabs? How is it supposed to heal if you keep picking at it?
concealer404 is offline  
Reply
Leave a poscat 2 Leave a negcat
Old 02-02-2018, 09:42 AM
  #4  
Junior Member
iTrader: (1)
 
dr_boone's Avatar
 
Join Date: Dec 2015
Location: Tulsa
Posts: 189
Total Cats: 17
Default
The internals may have a few surprises also. sub'd for carnage pics.
dr_boone is offline  
Reply
Leave a poscat 0 Leave a negcat
Old 02-02-2018, 09:46 AM
  #5  
Junior Member
 
WigglingWaffles's Avatar
 
Join Date: Aug 2017
Location: Lansing, MI
Posts: 479
Total Cats: 38
Default
In my neighborhood, fingering a crankcase has a whole different meaning...

subbing to see where this story goes
WigglingWaffles is offline  
Reply
Leave a poscat 0 Leave a negcat
Old 02-02-2018, 09:54 AM
  #6  
Senior Member
Thread Starter
iTrader: (18)
 
calteg's Avatar
 
Join Date: Nov 2006
Location: Austin, TX
Posts: 514
Total Cats: 40
Default
Well, got some interesting shrieking noises when I try and turn the motor by hand, so I pulled the head and...



I'm no expert, but I'm fairly certain the #3 piston shouldn't be stationary. I'll pull the pan during lunch, see if the rods are doing a decent pretzel impersonation.
calteg is offline  
Reply
Leave a poscat 1 Leave a negcat
Old 02-02-2018, 10:40 AM
  #7  
Slowest Progress Ever
iTrader: (26)
 
thirdgen's Avatar
 
Join Date: Oct 2007
Location: The coal ridden hills of Pennsylvania
Posts: 6,025
Total Cats: 304
Default

Lol where is it?
thirdgen is offline  
Reply
Leave a poscat 0 Leave a negcat
Old 02-02-2018, 12:56 PM
  #8  
Former Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 15,442
Total Cats: 2,100
Default
If you actually did a leakdown test on #3, that piston is welded into the bore or there's a big hole in it. 80psi x 8.4in^2 = ~700lbs of force applied straight down on the piston
Savington is offline  
Reply
Leave a poscat 1 Leave a negcat
Old 02-02-2018, 01:04 PM
  #9  
Senior Member
Thread Starter
iTrader: (18)
 
calteg's Avatar
 
Join Date: Nov 2006
Location: Austin, TX
Posts: 514
Total Cats: 40
Default
Originally Posted by Savington
If you actually did a leakdown test on #3, that piston is welded into the bore or there's a big hole in it. 80psi x 8.4in^2 = ~700lbs of force applied straight down on the piston
I'm assuming the rings are **** too. If #3 is stuck at TDC, I should've had decent leakdown numbers. Guess it's time to go over the head more thoroughly too
calteg is offline  
Reply
Leave a poscat 0 Leave a negcat
Old 02-02-2018, 02:01 PM
  #10  
Junior Member
 
sshamrockk's Avatar
 
Join Date: Oct 2016
Location: Western Mass.
Posts: 270
Total Cats: 20
Default


Patiently waiting for OP to upload a picture like this..
sshamrockk is offline  
Reply
Leave a poscat 0 Leave a negcat
Old 02-02-2018, 02:08 PM
  #11  
Junior Member
iTrader: (1)
 
dr_boone's Avatar
 
Join Date: Dec 2015
Location: Tulsa
Posts: 189
Total Cats: 17
Default
Originally Posted by sshamrockk


Patiently waiting for OP to upload a picture like this..
His should resemble a puzzle piece not a banana
dr_boone is offline  
Reply
Leave a poscat 1 Leave a negcat
Old 02-02-2018, 02:48 PM
  #12  
Elite Member
iTrader: (3)
 
Monk's Avatar
 
Join Date: Apr 2014
Location: Huntington, Indiana
Posts: 2,885
Total Cats: 616
Default
Originally Posted by calteg
tldr: unusual bulges typically don't end well.
Sound dating advice.
Monk is offline  
Reply
Leave a poscat 0 Leave a negcat
Old 02-02-2018, 03:01 PM
  #13  
Senior Member
Thread Starter
iTrader: (18)
 
calteg's Avatar
 
Join Date: Nov 2006
Location: Austin, TX
Posts: 514
Total Cats: 40
Default
As promised, premium carnage pics:









So what are we thinking? Fresh head gasket and bolt the thing back together?

Hoping to salvage the head and the oil pan. Do the NA and NB share the same pan?



tldr; Don't be a *****, run allofit, earn glory.
calteg is offline  
Reply
Leave a poscat 2 Leave a negcat
Old 02-02-2018, 03:16 PM
  #14  
Moderator
iTrader: (1)
 
Girz0r's Avatar
 
Join Date: Jun 2014
Location: Austin, TX
Posts: 3,033
Total Cats: 324
Default
My favorite photo was the soup of bolts & metal
Girz0r is offline  
Reply
Leave a poscat 0 Leave a negcat
Old 02-02-2018, 04:23 PM
  #15  
Junior Member
 
albuquerquefx's Avatar
 
Join Date: Sep 2015
Location: Memphis, TN
Posts: 199
Total Cats: 31
Talking
Originally Posted by calteg
tldr; Don't be a *****, run allofit, earn glory.
Words to live by
albuquerquefx is offline  
Reply
Leave a poscat 0 Leave a negcat
Old 02-02-2018, 04:44 PM
  #16  
Elite Member
 
Scaxx's Avatar
 
Join Date: Sep 2015
Location: Seattle, WA
Posts: 1,651
Total Cats: 884
Default
Go to your local fab shop and have them weld the rod back together. Run all of it. Profit.
Scaxx is offline  
Reply
Leave a poscat 0 Leave a negcat
Old 02-02-2018, 05:13 PM
  #17  
Elite Member
iTrader: (5)
 
Stealth97's Avatar
 
Join Date: Oct 2007
Location: Canton, Ga
Posts: 2,156
Total Cats: 66
Default
Send it.
Stealth97 is offline  
Reply
Leave a poscat 0 Leave a negcat
Old 02-02-2018, 05:36 PM
  #18  
Senior Member
iTrader: (1)
 
huesmann's Avatar
 
Join Date: Jul 2014
Location: Silver Spring, MD
Posts: 659
Total Cats: -16
Default
huesmann is offline  
Reply
Leave a poscat 0 Leave a negcat
Old 02-02-2018, 06:20 PM
  #19  
Elite Member
 
DeerHunter's Avatar
 
Join Date: May 2008
Location: Canada
Posts: 1,989
Total Cats: 2,241
Default
I was thinking more of this:



May the good Lord take a liking to ya and blow you up real soon!
DeerHunter is offline  
Reply
Leave a poscat 0 Leave a negcat
Old 02-13-2018, 03:13 PM
  #20  
Senior Member
Thread Starter
iTrader: (18)
 
calteg's Avatar
 
Join Date: Nov 2006
Location: Austin, TX
Posts: 514
Total Cats: 40
Default
MiataTurbo: Taking ***** and venting blocks.

Looks like the piston kissed the head a little bit, valves seem okay. What does the hive think, is the head reusable?


calteg is offline  
Reply
Leave a poscat 0 Leave a negcat



Advanced Search
Quick Reply: Well...that's suboptimal


Reply Closed Thread Share

All times are GMT -4. The time now is 12:39 AM.