rod stretching carnage. - 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 06-14-2009, 09:21 AM   #1
Senior Member
Thread Starter
iTrader: (7)
 
Join Date: Aug 2007
Location: Southern Indiana
Posts: 1,371
Total Cats: -1
Default rod stretching carnage.

So, 2 days ago, my motor got over-revved. I am now following the tow truck. A rod exited the block. I was headed down a hill, I came into boost in 4th and around 10psi and 4000rpm, the motor studdered and died. The road and car behind me were covered in oil. There was no detonation. I will post up pictures later. I'm on my blackberry and I've been up all night.
wes65 is offline   Reply With Quote
Old 06-14-2009, 11:14 AM   #2
Senior Member
Thread Starter
iTrader: (7)
 
Join Date: Aug 2007
Location: Southern Indiana
Posts: 1,371
Total Cats: -1
Default

Name:  utf-8BSU1HMDAxNTMtMjAwOTA2MTQtMDY0N.jpg
Views: 3
Size:  14.0 KB
wes65 is offline   Reply With Quote
Old 06-14-2009, 11:17 AM   #3
Senior Member
Thread Starter
iTrader: (7)
 
Join Date: Aug 2007
Location: Southern Indiana
Posts: 1,371
Total Cats: -1
Default

Name:  utf-8BSU1HMDAxNTYtMjAwOTA2MTQtMDc0N.jpg
Views: 3
Size:  14.0 KB
wes65 is offline   Reply With Quote
Old 06-14-2009, 11:21 AM   #4
Senior Member
iTrader: (7)
 
Join Date: Jul 2007
Location: Milpitas, CA
Posts: 1,057
Total Cats: 1
Default

ouch. that sucks. Time for a build?
Marc D is offline   Reply With Quote
Old 06-14-2009, 11:36 AM   #5
Elite Member
iTrader: (7)
 
samnavy's Avatar
 
Join Date: Apr 2006
Location: VIRGINIA BEACH, VA
Posts: 6,020
Total Cats: 175
Default

I assume those are stock rods... just in time for the $299 special.
Do you have a dyno graph... or just tell us how much torque the 2860 is making for you.
samnavy is offline   Reply With Quote
Old 06-14-2009, 11:56 AM   #6
Senior Member
Thread Starter
iTrader: (7)
 
Join Date: Aug 2007
Location: Southern Indiana
Posts: 1,371
Total Cats: -1
Default

Quote:
Originally Posted by samnavy View Post
I assume those are stock rods... just in time for the $299 special.
Do you have a dyno graph... or just tell us how much torque the 2860 is making for you.
Yep. Stock. I don't know an exact number. Enough to go 12.6[email protected] I'm guessing 280wtq.
wes65 is offline   Reply With Quote
Old 06-14-2009, 12:33 PM   #7
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: 26,315
Total Cats: 1,913
Default

Did the motor actually spit the big end of the rod completely out of the block? Don't see that one to often.
Joe Perez is offline   Reply With Quote
Old 06-14-2009, 12:39 PM   #8
Senior Member
iTrader: (6)
 
Join Date: Sep 2007
Posts: 1,085
Total Cats: 30
Default

:/

Any estimate as to how high you overreved?
albumleaf is offline   Reply With Quote
Old 06-14-2009, 12:55 PM   #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: 26,315
Total Cats: 1,913
Default

This kind of thread kinda bothers me in a way. I've accidentally made the 2 -> 1 shift on two occasions. Wasn't logging either time so I don't know exactly how high I went, but it sounded interesting. And yet I still haven't expelled any rods through the side of the block. I can infer from this that either it was a really good day in the Osaka factory when my stock rods (and rod bolts) were made 18 years ago, or I'm a ***** and don't push my engine hard enough.
Joe Perez is offline   Reply With Quote
Old 06-14-2009, 01:05 PM   #10
Senior Member
iTrader: (8)
 
Join Date: Mar 2006
Location: Indianapolis, IN
Posts: 758
Total Cats: 5
Default

That sucks, Wes. I have a complete 99 long block (minus throttle body/ iacv) in New Albany if you are interested.
boileralum is offline   Reply With Quote
Old 06-14-2009, 01:37 PM   #11
Senior Member
Thread Starter
iTrader: (7)
 
Join Date: Aug 2007
Location: Southern Indiana
Posts: 1,371
Total Cats: -1
Default

Quote:
Originally Posted by Joe Perez View Post
Did the motor actually spit the big end of the rod completely out of the block? Don't see that one to often.
Yep, boost in, rod out. Hopefully i can get pictures of the block. It's fucked as well as the oil pan. There is a gash that i (from what i can feel) goes from near the bottom of the oil pan to as far as i can reach behind the starter. Maybe a 5" long split.

Quote:
Originally Posted by albumleaf View Post
:/

Any estimate as to how high you overreved?
Well, i let someone else drive the car. but it was an all out 1-2-1 so whatever going from 7krpm in second to first is. Maybe someone with a gearing chart for the 6 speed with 4:10's can tell us.

Quote:
Originally Posted by Joe Perez View Post
This kind of thread kinda bothers me in a way. I've accidentally made the 2 -> 1 shift on two occasions. Wasn't logging either time so I don't know exactly how high I went, but it sounded interesting. And yet I still haven't expelled any rods through the side of the block. I can infer from this that either it was a really good day in the Osaka factory when my stock rods (and rod bolts) were made 18 years ago, or I'm a ***** and don't push my engine hard enough.
Yeah, i wish you the best of luck. As soon as it got overreved, i knew that something bad was going to happen. Why i decided to go 1.5hrs away and race ppl, i dont know.

Quote:
Originally Posted by boileralum View Post
That sucks, Wes. I have a complete 99 long block (minus throttle body/ iacv) in New Albany if you are interested.
Hmmm, i may be interested in the head/intake. I have a bottom end already.
wes65 is offline   Reply With Quote
Old 06-14-2009, 01:41 PM   #12
Senior Member
Thread Starter
iTrader: (7)
 
Join Date: Aug 2007
Location: Southern Indiana
Posts: 1,371
Total Cats: -1
Default

wes65 is offline   Reply With Quote
Old 06-14-2009, 02:01 PM   #13
Senior Member
Thread Starter
iTrader: (7)
 
Join Date: Aug 2007
Location: Southern Indiana
Posts: 1,371
Total Cats: -1
Default

Name:  utf-8BSU1HMDAxNTYtMjAwOTA2MTQtMDc0N.jpg
Views: 3
Size:  159.0 KB
Name:  utf-8BSU1HMDAxNTMtMjAwOTA2MTQtMDY0N.jpg
Views: 3
Size:  354.8 KB
wes65 is offline   Reply With Quote
Old 06-14-2009, 02:15 PM   #14
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

god damn man that **** will buff out . Im sorry to here about your loss man.
magnamx-5 is offline   Reply With Quote
Old 06-14-2009, 02:35 PM   #15
Junior Member
iTrader: (1)
 
Join Date: Jul 2006
Location: Colorado
Posts: 403
Total Cats: 2
Default

Quote:
Originally Posted by wes65 View Post
Well, i let someone else drive the car. but it was an all out 1-2-1 so whatever going from 7krpm in second to first is. Maybe someone with a gearing chart for the 6 speed with 4:10's can tell us.
Final drive ration for 6 speed with 4.10 is
1st = 15.416
2nd = 9.3029
So assuming he dropped the clutch back in first at 7K and no lose of speed occurred during the "perfect" shift
15.416/9.3029 = 1.657 overdrive * 7000 = 11599 RPM
Chris Swearingen is offline   Reply With Quote
Old 06-14-2009, 02:42 PM   #16
Senior Member
Thread Starter
iTrader: (7)
 
Join Date: Aug 2007
Location: Southern Indiana
Posts: 1,371
Total Cats: -1
Default

Quote:
Originally Posted by Chris Swearingen View Post
Final drive ration for 6 speed with 4.10 is
1st = 15.416
2nd = 9.3029
So assuming he dropped the clutch back in first at 7K and no lose of speed occurred during the "perfect" shift
15.416/9.3029 = 1.657 overdrive * 7000 = 11599 RPM

Well, there we go. revving to 12k will make your motor pop. Who knew?
wes65 is offline   Reply With Quote
Old 06-14-2009, 03:38 PM   #17
Senior Member
Thread Starter
iTrader: (7)
 
Join Date: Aug 2007
Location: Southern Indiana
Posts: 1,371
Total Cats: -1
Default

So, the rod bolt is mostly in tact. Does that seem strange to anyone else?
wes65 is offline   Reply With Quote
Old 06-14-2009, 03:44 PM   #18
Elite Member
iTrader: (28)
 
Join Date: May 2008
Location: St. Augustine FL
Posts: 2,310
Total Cats: 2
Default

maybe thats the fail point maybe it backed out and your rod and piston floated freely untill the crank came around and well the ignition..... idk just a thought, well time for the build, sorry about the loss there
p51hellfire is offline   Reply With Quote
Old 06-14-2009, 03:52 PM   #19
Elite Member
iTrader: (33)
 
RotorNutFD3S's Avatar
 
Join Date: Jan 2007
Location: Newnan, GA
Posts: 2,539
Total Cats: 29
Default

Wow! Sorry to see that! Good luck in the ensuing project!
RotorNutFD3S is offline   Reply With Quote
Old 06-14-2009, 05:00 PM   #20
Elite Member
iTrader: (15)
 
Join Date: Sep 2007
Location: Incline Village, NV
Posts: 2,073
Total Cats: 5
Default

Isn't it such a great sound hearing your rod go through the block and pan?

In for many pictures when you get it out.
thesnowboarder is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 57 07-19-2017 05:11 PM
OTS Bilstein to motorsports ASN conversion stoves Suspension, Brakes, Drivetrain 5 04-21-2016 04:00 PM
Odd Steering issue interestedofold Suspension, Brakes, Drivetrain 5 09-29-2015 02:42 PM
Bp/b6 Scat H beam rods Dparks7 Miata parts for sale/trade 1 09-28-2015 10:49 AM


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 02:14 AM.