Blew the motor! Rebuild time. - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


DIY Turbo Discussion greddy on a 1.8? homebrew kit?

Reply
 
 
 
LinkBack Thread Tools
Old 06-25-2009, 10:19 PM   #1
Hittin' Boost & Cones
Thread Starter
iTrader: (2)
 
240_to_miata's Avatar
 
Join Date: May 2007
Location: Cromwell, Connecticut
Posts: 2,572
Total Cats: 11
Default Blew the motor! Rebuild time.

Well, my motor blew today during a little cruise at lunch. My setup is in my sig..... 13 PSI on a SR20DET T25, stock 1.8L motor, megasquirt running a very conservative timming map (avg. of about 3 degrees more than DIY's base).

It blew when i was rolling into the throttle in first, maybe 4 or 5k RPMS, it had a sudden lurch, knock light lit up and stayed lit, I shifted into second and heard the MASSIVE tick.

This afternoon I pulled the valve cover off and everything looks normal, I drained the oil and strained it with a paint filter.... and amazingly it was perfectly clean!!!! So its not bearings. I'm kinda stumped. The motor will be out soon pending the weather holding out. Ill keep this updated.


I am just amazed I blew a motor with a t25 and a decent tune. It had 135k on it and even (but low) compression. It dynoed at 98 rwhp stock so it wasnt the most healthy motor.

Enough ranting, sorry for the horrible grammar.
240_to_miata is offline   Reply With Quote
Old 06-26-2009, 12:26 AM   #2
Elite Member
iTrader: (11)
 
Join Date: Jun 2007
Location: Meriden, CT
Posts: 2,072
Total Cats: 1
Default

Damn, that sux...
Cspence is offline   Reply With Quote
Old 06-26-2009, 12:37 AM   #3
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,364
Total Cats: 1,325
Default

Do all your pistons still go up and down?
Savington is online now   Reply With Quote
Old 06-26-2009, 12:38 AM   #4
Elite Member
iTrader: (1)
 
NA6C-Guy's Avatar
 
Join Date: Feb 2008
Location: Birmingham Alabama
Posts: 8,038
Total Cats: 43
Default

Sorry to hear. Well, another stocker bites the dust, and all the more reason for me to wait.
NA6C-Guy is offline   Reply With Quote
Old 06-26-2009, 02:22 AM   #5
Elite Member
iTrader: (7)
 
Join Date: Jan 2007
Location: Renton Washington
Posts: 1,742
Total Cats: 3
Default

More reason for me to find a 1.8L and put these M-tuned rods in there. 200cc's is an extra 200cc's
SKMetalworks is offline   Reply With Quote
Old 06-26-2009, 07:44 AM   #6
Hittin' Boost & Cones
Thread Starter
iTrader: (2)
 
240_to_miata's Avatar
 
Join Date: May 2007
Location: Cromwell, Connecticut
Posts: 2,572
Total Cats: 11
Default

Quote:
Originally Posted by Savington View Post
Do all your pistons still go up and down?
The thing runs, idles, and revs, but it is hurting, lol. It even sorda drives ( i was forced to drive it 1/4 mile back to work so i could get a tow after work) Just for ***** I will do a compression test today.
240_to_miata is offline   Reply With Quote
Old 06-26-2009, 09:57 AM   #7
Tour de Franzia
iTrader: (6)
 
hustler's Avatar
 
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,114
Total Cats: 351
Default

Quote:
Originally Posted by sbkcocker499 View Post
More reason for me to find a 1.8L and put these M-tuned rods in there. 200cc's is an extra 200cc's
yep, and worth every cent for the rods and pistons.
hustler is offline   Reply With Quote
Old 06-26-2009, 10:03 AM   #8
Senior Member
iTrader: (6)
 
tyson87's Avatar
 
Join Date: Aug 2008
Location: West Palm Beach, FL
Posts: 1,023
Total Cats: 1
Default

Quote:
Originally Posted by hustler View Post
yep, and worth every cent for the rods and pistons.
i want to upgrade to a 1.8 as well, but its more than just the price of the engine.
new manifold, MS, wiring harness.
tyson87 is offline   Reply With Quote
Old 06-26-2009, 10:06 AM   #9
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Chicago (Over two miles from Wrigley Field. Fuck the Cubs. Fuck them in their smarmy goat-hole.)
Posts: 26,318
Total Cats: 1,916
Default

Quote:
Originally Posted by tyson87 View Post
i want to upgrade to a 1.8 as well, but its more than just the price of the engine.
new manifold, MS, wiring harness.
Manifold, yes. MS and wiring harness, no. Your 1.6 wiring, sensors, and computer will work just fine on the 1.8 engine. Upgrading the MS to an MS2 would be optional if you went with an NB block & head.
Joe Perez is offline   Reply With Quote
Old 06-26-2009, 10:09 AM   #10
Senior Member
iTrader: (6)
 
tyson87's Avatar
 
Join Date: Aug 2008
Location: West Palm Beach, FL
Posts: 1,023
Total Cats: 1
Default

Quote:
Originally Posted by Joe Perez View Post
Manifold, yes. MS and wiring harness, no. Your 1.6 wiring, sensors, and computer will work just fine on the 1.8 engine. Upgrading the MS to an MS2 would be optional if you went with an NB block & head.
hmmm, i didnt know that.
its time for me to start searching....
tyson87 is offline   Reply With Quote
Old 06-26-2009, 10:16 AM   #11
Hear me Meow
iTrader: (3)
 
skidude's Avatar
 
Join Date: Apr 2008
Location: Outside Portland Maine
Posts: 1,994
Total Cats: 13
Default

Well that sucks. I need to get a decent tune into mine so it will last until I get a new one.
skidude is offline   Reply With Quote
Old 06-26-2009, 10:20 AM   #12
Tour de Franzia
iTrader: (6)
 
hustler's Avatar
 
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,114
Total Cats: 351
Default

Quote:
Originally Posted by tyson87 View Post
hmmm, i didnt know that.
its time for me to start searching....
then either get a job or start sucking. I'd rather have a built 1.6 than a stock 1.8 though.

Just ****** up a blow bottom 99 motor and go from there. I had a 28k mile motor for mine and I'm happy I opened it up and went with forged guts.
hustler is offline   Reply With Quote
Old 06-26-2009, 10:49 AM   #13
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,242
Total Cats: 290
Default

Quote:
Originally Posted by 240_to_miata View Post
I am just amazed I blew a motor with a t25 and a decent tune.
A weak motor is a weak motor. I put a freshened cylinder head on a very tired bottom end for an ITA Miata. That head made the car a full 2 seconds a lap quicker. But I knew that extra (compression) power was only going to stress the bottom end. Sure enough, 3 laps to go in the enduro (our last race of the weekend), while running in second place, the engine spun a bearing. And that was w/o boost.
m2cupcar is offline   Reply With Quote
Old 06-26-2009, 01:36 PM   #14
Elite Member
iTrader: (8)
 
Join Date: Aug 2007
Location: Bellingham, Wa
Posts: 2,732
Total Cats: 3
Default

damn this makes me nervous! Even though my motor has still less than 10k on it (prolly less than 6k). Its still only built to stock specs.

How many boosted miles did you last?
wayne_curr is offline   Reply With Quote
Old 06-26-2009, 08:04 PM   #15
I EAT CUM
iTrader: (6)
 
Join Date: Sep 2008
Location: Redneck, Texas
Posts: 1,218
Total Cats: -1
Default

Damn, kind of scares me.
Turbo_4 is offline   Reply With Quote
Old 06-26-2009, 08:58 PM   #16
Hittin' Boost & Cones
Thread Starter
iTrader: (2)
 
240_to_miata's Avatar
 
Join Date: May 2007
Location: Cromwell, Connecticut
Posts: 2,572
Total Cats: 11
Default

3000 miles.... was gunna change the oil this weekend. Its still raining here, so the motor isnt out yet.

Compression test results (No spark plugs, throttle wide open, cold motor)...

175, 50, 175, 125

Something is up....
It was about 175-180 all around when i installed the turbo.
240_to_miata is offline   Reply With Quote
Old 06-27-2009, 02:39 PM   #17
I EAT CUM
iTrader: (6)
 
Join Date: Sep 2008
Location: Redneck, Texas
Posts: 1,218
Total Cats: -1
Default

Definitely going to keep following this thread...Let us know what you find out!
Turbo_4 is offline   Reply With Quote
Old 06-27-2009, 02:48 PM   #18
Tour de Franzia
iTrader: (6)
 
hustler's Avatar
 
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,114
Total Cats: 351
Default

Quote:
Originally Posted by tyson87 View Post
hmmm, i didnt know that.
its time for me to start searching....
how could you not? Its the most rudimentary basic information for anyone with a 1.6.
hustler is offline   Reply With Quote
Old 06-27-2009, 03:23 PM   #19
Elite Member
 
Join Date: Feb 2008
Location: Victoria, BC
Posts: 2,322
Total Cats: 12
Default

What octane gas did you have in there?
dustinb is offline   Reply With Quote
Old 06-27-2009, 07:10 PM   #20
Hittin' Boost & Cones
Thread Starter
iTrader: (2)
 
240_to_miata's Avatar
 
Join Date: May 2007
Location: Cromwell, Connecticut
Posts: 2,572
Total Cats: 11
Default

sonoco 93 octane
240_to_miata is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Expected intake temps on the track? tazswing Race Prep 20 10-03-2015 12:04 PM
Back to Stock Part Out!! Turbo Parts, MS2 Enhanced 01-05, Suspension, and MOAR! StratoBlue1109 Miata parts for sale/trade 16 10-02-2015 10:39 AM
Bad head gasket or ? shooterschmidty Engine Performance 8 09-30-2015 11:28 PM
Nuke Mars! Joe Perez Current Events, News, Politics 8 09-30-2015 05:41 PM
Are my coils failing? viriiguy General Miata Chat 5 09-28-2015 08:39 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 05:10 PM.