bottom of wiseco piston sort of missing - Page 3 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


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

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 11-07-2015, 01:44 PM   #41
Elite Member
iTrader: (15)
 
patsmx5's Avatar
 
Join Date: Aug 2007
Location: Houston, TX
Posts: 8,797
Total Cats: 248
Default

patsmx5 is offline   Reply With Quote
Old 11-07-2015, 02:46 PM   #42
Junior Member
 
Join Date: May 2008
Location: Grants Pass, OR.
Posts: 449
Total Cats: 14
Default

Wiseco's
jmann is offline   Reply With Quote
Old 11-07-2015, 03:55 PM   #43
Senior Member
Thread Starter
 
Join Date: Jun 2015
Location: TAMPA, FL
Posts: 644
Total Cats: 27
Default

For those who asked to see what fell into the oil pan, I present the oil squirter bolt, the oil squirter and oil squirter bolt washer and various pieces of piston skirt.


Attached Thumbnails
bottom of wiseco piston sort of missing-80-broken_bits_eb9d8ab802e2f02290819aa60a61b380a50fd428.jpg  
AlwaysBroken is offline   Reply With Quote
Old 11-07-2015, 05:06 PM   #44
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Delicious and Moist.
Posts: 26,326
Total Cats: 1,925
Default

Realistically speaking, these two things are probably not directly related:






"Yes, nothing gets the taste of shame and humiliation out of your mouth quite like Bebop-A-Reebop Rhubarb Pie."
Attached Thumbnails
bottom of wiseco piston sort of missing-80-supercel_401d7694bce826b5ae3c40e52560cdaa99b84f1a.jpg  
Joe Perez is offline   Reply With Quote
Old 11-07-2015, 05:17 PM   #45
Elite Member
iTrader: (15)
 
patsmx5's Avatar
 
Join Date: Aug 2007
Location: Houston, TX
Posts: 8,797
Total Cats: 248
Default

I don't have the MAF sensor installed. One day I gotta make this car pass emissions with the boost setup still installed.
patsmx5 is offline   Reply With Quote
Old 11-07-2015, 07:54 PM   #46
Junior Member
 
Join Date: Jan 2014
Location: Port Saint Lucie,FL
Posts: 418
Total Cats: 3
Default

I still can't believe the torque spec for the squirters are like 9-13 ft lbs...
Mech5700 is offline   Reply With Quote
Old 11-07-2015, 08:16 PM   #47
Senior Member
iTrader: (3)
 
Join Date: Dec 2007
Location: Brownsburg,IN
Posts: 800
Total Cats: 58
Default

It is a hollow bolt with two holes so it is not very strong, i put locktite on mine when installing them just to make me feel better but it is not common to hear about the bolts backing out like yours did, probaby forgot to torque it when installing it ...
HHammerly is offline   Reply With Quote
Old 11-15-2015, 08:13 PM   #48
Senior Member
Thread Starter
 
Join Date: Jun 2015
Location: TAMPA, FL
Posts: 644
Total Cats: 27
Default

Pic of the carnage. There's a feelable scratch in the cylinder wall right where the middle of the carnage occurred but everything else seems fine. Bores are square (under .1mm) and smooth besides the scratch.

My current plan is to replace the busted piston with an identical one from wiseco + new rings (about 100 bucks) and put it all back together, capping the oil sprayer holes with bolts. While the head is off, I'm going to get a valve job and new springs.



Attached Thumbnails
bottom of wiseco piston sort of missing-80-explosive_levels_of_power_6f206f1114e23947a3c2f7575476311ccde19bf8.jpg   bottom of wiseco piston sort of missing-80-explosive_levels_of_power_ce3800a51a35a78c306fa8f6875d466224566a4b.jpg  
AlwaysBroken is offline   Reply With Quote
Old 11-15-2015, 08:22 PM   #49
Elite Member
iTrader: (21)
 
Join Date: Jun 2007
Location: Rochester, NY
Posts: 5,687
Total Cats: 560
Default

That's not carnage. That's weight saving for faster revving.
rleete is offline   Reply With Quote
Old 11-16-2015, 06:29 PM   #50
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,367
Total Cats: 1,331
Default

You plan to hone that cylinder so the new rings will actually seat, right?
Savington is offline   Reply With Quote
Old 11-16-2015, 07:05 PM   #51
Senior Member
Thread Starter
 
Join Date: Jun 2015
Location: TAMPA, FL
Posts: 644
Total Cats: 27
Default

I'm not planning on getting it done properly at a machine shop or anything, but I will probably do a ball hone on this cylinder unless someone has a better suggestion. I'll be honest that I'm kinda nervous about this.

I've pondered whether I should rering all 4 cylinders while I have everything apart, but the others had good compression last time I checked so I figure I will just let sleeping dogs lie.

edit- as always, I welcome advice. The only thing worse than having to take everything apart is the worry that I'll have to take everything apart again later because I skipped something easy.
AlwaysBroken is offline   Reply With Quote
Old 11-16-2015, 07:42 PM   #52
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,367
Total Cats: 1,331
Default

If there is a ridge bad enough to catch your fingernail, it will let air escape and it has the potential to cause damage to the new piston. If it were my motor, I would correct any scoring, even if it meant overboring and replacing pistons.

I would never ballhone a cylinder, personally. Getting the hone angle and depth is best left to a professional. Get that wrong and the rings never seal up, and you'll just be opening it back up all over again.

What do the rest of your bearings look like after having metal circulated in the oil system?
Savington is offline   Reply With Quote
Old 11-16-2015, 08:26 PM   #53
Senior Member
Thread Starter
 
Join Date: Jun 2015
Location: TAMPA, FL
Posts: 644
Total Cats: 27
Default

So far I don't see any signs of debris ingestion or oil starvation. I haven't inspected every single surface yet but so far everything looks surprisingly good. Ie, the bearings/journal surfaces look and feel new/smooth/clean with a thin layer of clean oil.

I didn't think it would be that hard to do a hone without screwing it up. I mean, you can tell the angle of the crosshatching visually, and Wiseco is pretty explicit about what you have to do to seat their rings.
AlwaysBroken is offline   Reply With Quote
Old 11-16-2015, 08:29 PM   #54
SADFab Destructive Testing Engineer
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 17,999
Total Cats: 1,466
Default

Re-ring all of your cylinders. Reusing rings is just begging them not to seal.
aidandj is offline   Reply With Quote
Old 11-16-2015, 08:57 PM   #55
Senior Member
Thread Starter
 
Join Date: Jun 2015
Location: TAMPA, FL
Posts: 644
Total Cats: 27
Default

But if they have already been in the car for years and have good compression, haven't they already sealed? I haven't taken the 3 other pistons/rods out of the car. I was planning to hone the cylinder and replace the busted piston, using fresh rings.
AlwaysBroken is offline   Reply With Quote
Old 11-16-2015, 08:58 PM   #56
SADFab Destructive Testing Engineer
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 17,999
Total Cats: 1,466
Default

Hmmm, maybe if you don't pull them you don't have to. But I've always heard not to reuse rings.

Someone else will know more than me.
aidandj is offline   Reply With Quote
Old 11-16-2015, 09:28 PM   #57
Elite Member
 
codrus's Avatar
 
Join Date: Mar 2007
Location: Santa Clara, CA
Posts: 3,878
Total Cats: 344
Default

Quote:
Originally Posted by aidandj View Post
Hmmm, maybe if you don't pull them you don't have to. But I've always heard not to reuse rings.

Someone else will know more than me.
If you haven't taken them out, you're not "reusing" them any more than you are when you start the car every morning.

--Ian
codrus is offline   Reply With Quote
Old 11-16-2015, 09:44 PM   #58
Junior Member
 
Join Date: May 2008
Location: Grants Pass, OR.
Posts: 449
Total Cats: 14
Default

Make sure to use a hone for moly rings and not Iron rings, it well be a fine grit. Make sure and cover the crank with a piece of cardboard an keep it smooth so the hone doesn't hang up on it when you go deep. Like Andrew said if you can hang your nail on the scratch it is to deep, especially since it is probably vertical which well cause oil burning and slight compression leak. Alot depends on how narrow it is also, if wide and deep you need to rebore or replace.
jmann is offline   Reply With Quote
Old 11-16-2015, 09:59 PM   #59
Senior Member
Thread Starter
 
Join Date: Jun 2015
Location: TAMPA, FL
Posts: 644
Total Cats: 27
Default

edit- the scratch isn't deep enough to catch a fingernail, it's just enough to feel with my fingertip

but on the bad side, I removed the carbon buildup on the 1/2/4 pistons and #1 has a bunch of little nicks on the edges, a bunch right against the intake side and a bunch right against the exhaust side. Looks foreign object damage. Fuuuu....

Last edited by AlwaysBroken; 11-16-2015 at 10:48 PM.
AlwaysBroken is offline   Reply With Quote
Old 11-16-2015, 10:27 PM   #60
SADFab Destructive Testing Engineer
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 17,999
Total Cats: 1,466
Default

Quote:
Originally Posted by codrus View Post
If you haven't taken them out, you're not "reusing" them any more than you are when you start the car every morning.

--Ian
Wait...you aren't supposed to rebuild your engine every morning?!?! I've been missing out on so much sleep.
aidandj is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
4 dead fuel pumps? WTF astroboy Engine Performance 9 11-20-2016 06:02 AM
Wilwood big brake kit. Brand new (front). nixapgt Miata parts for sale/trade 12 11-20-2015 11:43 AM
6 Speed automated shifting system idea patsmx5 Suspension, Brakes, Drivetrain 35 11-18-2015 12:04 AM
Hard dog M1 Roll Bar Single Diagonal $440 thommorud Miata parts for sale/trade 7 11-09-2015 03:54 PM
push clutch in engine doesn't like to stay running. David Reith Suspension, Brakes, Drivetrain 10 11-08-2015 07:06 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 09:50 PM.