Go Back   Subaru Impreza Forum - WRX STI Rally Performance Tuning > Subaru Impreza General > Subaru Impreza Discussions

Subaru Impreza Forum

Blown Piston after crankshaft and piston replacement
Reply
 
LinkBack Thread Tools Display Modes
Old 23 Nov 2010, 05:21 PM   #16 (permalink)
Obsessed Scooby
 
stiimpreza1984's Avatar
 
Join Date: Jul 2008
Location: Cork, Ireland
Posts: 7,475
Re: Blown Piston after crankshaft and piston replacement

Quote:
Originally Posted by carwisperer View Post
the only other bit that cringed me a bit...is that you say it happen'd at about 5000rpm!thats only a week later after new rings etc where you not advised to keep you rpm to under 3000 for the first 500miles+??this is important as your running in new piston,rings,bearings etc mate..and you need a good oil for this period too!then changed after the running in period still preferably a good oil again..,components could have failed due to this mate..
Thats what I was thinking aswell
__________________
SEE NO EVO HEAR NO EVO!
Offline   Reply With Quote
Old 23 Nov 2010, 06:43 PM   #17 (permalink)
Cool Scooby
 
carwisperer's Avatar
 
Join Date: Aug 2010
Location: carmarthenshire
Posts: 406
Send a message via Skype™ to carwisperer
Re: Blown Piston after crankshaft and piston replacement

Quote:
Originally Posted by stiimpreza1984 View Post
Thats what I was thinking aswell
Not good start is it..,and i cant believe the mechanic let him gun it on the road test and didnt advise him of running in etc
Offline   Reply With Quote
Old 23 Nov 2010, 06:45 PM   #18 (permalink)
Fresh Scooby
 
Fundikali's Avatar
 
Join Date: Nov 2010
Location: Nairobi
Posts: 38
Re: Blown Piston after crankshaft and piston replacement

Quote:
Originally Posted by carwisperer View Post
the only other bit that cringed me a bit...is that you say it happen'd at about 5000rpm!thats only a week later after new rings etc where you not advised to keep you rpm to under 3000 for the first 500miles+??this is important as your running in new piston,rings,bearings etc mate..and you need a good oil for this period too!then changed after the running in period still preferably a good oil again..,components could have failed due to this mate..
I use Mobil 1 10W-30. Is that good oil for a car that's done 50, 000Kms? I talked to the garage and they tell me that they have replaced the blown piston and con rod. The say the other two pistons are fine. They've also put in new rings and bearings, and say the car will be tested tomorrow. I have an STI Genome boost gauge. Is it crucial that I add Oil Pressure and Temperature Gauges?
Offline   Reply With Quote
Old 23 Nov 2010, 06:51 PM   #19 (permalink)
Cool Scooby
 
carwisperer's Avatar
 
Join Date: Aug 2010
Location: carmarthenshire
Posts: 406
Send a message via Skype™ to carwisperer
Re: Blown Piston after crankshaft and piston replacement

Quote:
Originally Posted by Fundikali View Post
I use Mobil 1 10W-30. Is that good oil for a car that's done 50, 000Kms? I talked to the garage and they tell me that they have replaced the blown piston and con rod. The say the other two pistons are fine. They've also put in new rings and bearings, and say the car will be tested tomorrow. I have an STI Genome boost gauge. Is it crucial that I add Oil Pressure and Temperature Gauges?
not so much oil temp gauge but oil pressure gauge is very handy to be able to keep an eye on whats its at that way you wont stress it if you can see the pressure isnt right... so all your pistons have new rings now?and you now have to new pistons am i right??
Offline   Reply With Quote
Old 23 Nov 2010, 06:56 PM   #20 (permalink)
Senior Scooby
 
Join Date: Jan 2010
Posts: 1,370
Re: Blown Piston after crankshaft and piston replacement

Make sure your petrol is a high enough octane. Over here we need 98ron using the wrong stuff can cause detonation and lead to premature bearing failure which was your original problem
Offline   Reply With Quote
Old 23 Nov 2010, 07:08 PM   #21 (permalink)
Fresh Scooby
 
Fundikali's Avatar
 
Join Date: Nov 2010
Location: Nairobi
Posts: 38
Re: Blown Piston after crankshaft and piston replacement

Quote:
Originally Posted by carwisperer View Post
not so much oil temp gauge but oil pressure gauge is very handy to be able to keep an eye on whats its at that way you wont stress it if you can see the pressure isnt right... so all your pistons have new rings now?and you now have to new pistons am i right??
YES! New rings on all pistons and yes, I now have two new pistons. Any suggestions on which site I can buy from online. I have a buddy coming over for the holidays and could have it delivered to him and he can bring it over for me.
Offline   Reply With Quote
Old 23 Nov 2010, 07:11 PM   #22 (permalink)
Fresh Scooby
 
Fundikali's Avatar
 
Join Date: Nov 2010
Location: Nairobi
Posts: 38
Re: Blown Piston after crankshaft and piston replacement

Quote:
Originally Posted by shambles View Post
Make sure your petrol is a high enough octane. Over here we need 98ron using the wrong stuff can cause detonation and lead to premature bearing failure which was your original problem
There really is no much choice here. Its only unleaded premium and Shell V-Power. I'll endeavor to find out the octane ratings. Thanks for the tip.
Offline   Reply With Quote
Old 23 Nov 2010, 07:22 PM   #23 (permalink)
Cool Scooby
 
carwisperer's Avatar
 
Join Date: Aug 2010
Location: carmarthenshire
Posts: 406
Send a message via Skype™ to carwisperer
Re: Blown Piston after crankshaft and piston replacement

Quote:
Originally Posted by Fundikali View Post
There really is no much choice here. Its only unleaded premium and Shell V-Power. I'll endeavor to find out the octane ratings. Thanks for the tip.
Can you buy a good octane booster additive some where mate?and try use that as much as possible if its that difficult to get good fuel
Offline   Reply With Quote
Old 23 Nov 2010, 07:38 PM   #24 (permalink)
Fresh Scooby
 
Fundikali's Avatar
 
Join Date: Nov 2010
Location: Nairobi
Posts: 38
Re: Blown Piston after crankshaft and piston replacement

Quote:
Originally Posted by carwisperer View Post
Can you buy a good octane booster additive some where mate?and try use that as much as possible if its that difficult to get good fuel
I'll definitely shop for an additive and see whats on the market.
Offline   Reply With Quote
Old 23 Nov 2010, 10:55 PM   #25 (permalink)
Young Scooby
 
imprezaR1's Avatar
 
Join Date: Nov 2010
Location: Shropshire
Posts: 89
Re: Blown Piston after crankshaft and piston replacement

its a dusty old place is kenya ! have they left the airfilter out after the strip down!
__________________
"Everyone's got a game plan until they get punched in the mouth." Mike Tyson
Offline   Reply With Quote
Old 23 Nov 2010, 11:04 PM   #26 (permalink)
Obsessed Scooby
 
stiimpreza1984's Avatar
 
Join Date: Jul 2008
Location: Cork, Ireland
Posts: 7,475
Re: Blown Piston after crankshaft and piston replacement

Quote:
Originally Posted by carwisperer View Post
Not good start is it..,and i cant believe the mechanic let him gun it on the road test and didnt advise him of running in etc
cant believe it either wonder whats the highest rated fuel over doh? was it caused by detonation from low octane fuel? and thats why it wrecked engine?
__________________
SEE NO EVO HEAR NO EVO!
Offline   Reply With Quote
Old 23 Nov 2010, 11:13 PM   #27 (permalink)
Obsessed Scooby
 
stiimpreza1984's Avatar
 
Join Date: Jul 2008
Location: Cork, Ireland
Posts: 7,475
Re: Blown Piston after crankshaft and piston replacement


what a piston looks like after detonation is the engine stripped yet?
__________________
SEE NO EVO HEAR NO EVO!
Offline   Reply With Quote
Old 23 Nov 2010, 11:42 PM   #28 (permalink)
Cool Scooby
 
carwisperer's Avatar
 
Join Date: Aug 2010
Location: carmarthenshire
Posts: 406
Send a message via Skype™ to carwisperer
Re: Blown Piston after crankshaft and piston replacement

Quote:
Originally Posted by stiimpreza1984 View Post
cant believe it either wonder whats the highest rated fuel over doh? was it caused by detonation from low octane fuel? and thats why it wrecked engine?
just premium he says what ever rating that is there..?? i dont think it did detonate from whats said..just started knocking but at those rpm's after that work i with no proper running in period its inevitable some things going to go wrong..,but by the sound s of it the crank has survived as there has been no mention of that..so thats very lucky
Offline   Reply With Quote
Old 23 Nov 2010, 11:45 PM   #29 (permalink)
Cool Scooby
 
carwisperer's Avatar
 
Join Date: Aug 2010
Location: carmarthenshire
Posts: 406
Send a message via Skype™ to carwisperer
Re: Blown Piston after crankshaft and piston replacement

oh and shell V power i just seen he posted well thats the best option he has then?
Offline   Reply With Quote
Old 24 Nov 2010, 03:21 AM   #30 (permalink)
Fresh Scooby
 
Fundikali's Avatar
 
Join Date: Nov 2010
Location: Nairobi
Posts: 38
Re: Blown Piston after crankshaft and piston replacement

Quote:
Originally Posted by imprezaR1 View Post
its a dusty old place is kenya ! have they left the airfilter out after the strip down!
Air element was properly installed.
Offline   Reply With Quote
Reply

Bookmarks

Tags
blown, crankshaft, piston, rod knock


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

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 On
Pingbacks are On
Refbacks are On



All times are GMT. The time now is 03:12 PM.



Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
LinkBacks Enabled by vBSEO 3.6.0 PL2 © 2011, Crawlability, Inc.