thewelsho Posted October 30, 2007 Posted October 30, 2007 As most of you know, I have had running issues since the last track day which was 4 days after re-mapping to some nice figures. Well, Andy.F said a broken ring land, Duncan said broken piston; but you'd never guess what it was... yes, a broken piston! Congratutlations Andy, now you can now say, "well I have seen this twice before...". LOL! Block is being taken to some guy in Edinburgh to tidy up the bore which wasn't too badly damage and to get measured up for the new pistons. Then Duncan is going to drop in some shiny new forged-pistons, race shells and uprated oil pump. Likely to be these pistons here: http://www.forgedpistons.co.uk/products/product.asp?id=197 I think. At least it will be back better, stronger and faster than ever!
colzo Posted October 30, 2007 Posted October 30, 2007 Glad you`ve found the problem John, what would have caused the piston to break?
scoobymark Posted October 30, 2007 Posted October 30, 2007 John, Again glad you managed to get to the bottom of the problem, with a bit of help from duncan. Heard he worked late to take some goodies of your car How did you manage to break a piston? you must have let someone else do a few laps in your car
jimser Posted October 30, 2007 Posted October 30, 2007 glad youve finally got to the bottom of your problem john. is it true when you open up the 2.5 engines there made of chocolate? jim
marky.t.s Posted October 30, 2007 Posted October 30, 2007 thats a relief......no more "what do you thinks wrong with this....." posts then J.W.
RA Dunk Posted October 30, 2007 Posted October 30, 2007 in with the forged pistons and crank up the boost
fai17 Posted October 31, 2007 Posted October 31, 2007 glad youve finally got to the bottom of your problem john.is it true when you open up the 2.5 engines there made of chocolate? jim same as what the 5 speed gear boxes are made of then
fai17 Posted October 31, 2007 Posted October 31, 2007 there will be a number of things that you will need for the rebuild too! But at least you have got to the root of the problem and you'll be able to crank up the boost too. I hope it all goes well for you and remember that you will need to run her in after the rebuild
thewelsho Posted October 31, 2007 Author Posted October 31, 2007 Don't really know what caused it to break, maybe the 2.5 is made of chocolate. Maybe running too much power, maybe the fact that I was low on oil on two seperate occaisions on track, or maybe it was faulty. With the new bits and my promise to look after it a bit more (yeah right) that should prevent a repeat!
fai17 Posted October 31, 2007 Posted October 31, 2007 Don't really know what caused it to break, maybe the 2.5 is made of chocolate. Maybe running too much power, maybe the fact that I was low on oil on two seperate occaisions on track, or maybe it was faulty. With the new bits and my promise to look after it a bit more (yeah right) that should prevent a repeat! Yes John..you will really need to make sure all the fluid level are checked regularly and also before going on track.
thewelsho Posted October 31, 2007 Author Posted October 31, 2007 you must have let someone else do a few laps in your car That's fightin' talk! Bring your chariot to the first KH of next yearand we'll see who's the quickest! Ha! Thankd for all the positive comments, hopefully it will be sorted soon.
thewelsho Posted October 31, 2007 Author Posted October 31, 2007 Yes John..you will really need to make sure all the fluid level are checked regularly and also before going on track. yeah I know, jsut being a lazy a55! Your wheels gone now?
gus the bus Posted October 31, 2007 Posted October 31, 2007 John, glad to hear its getting sorted! I take it the work cant get done under warranty!?!? Have to be honest and say I was holding off going the VF34 and othe bits until I heard what your problem was. didnt/ dont want to end up with the same problems Gus
coulty Posted October 31, 2007 Posted October 31, 2007 (edited) Might as well stick some uprated rods in there while you are doing the pistons. Edited October 31, 2007 by coulty
thewelsho Posted October 31, 2007 Author Posted October 31, 2007 John,glad to hear its getting sorted! I take it the work cant get done under warranty!?!? Have to be honest and say I was holding off going the VF34 and othe bits until I heard what your problem was. didnt/ dont want to end up with the same problems Gus Na, no warranty. Had an attack of conscience. Wasn't honest of me to ask Subaru to repair damage that was done while the car had been tracked and modded. I thought about saying to them, but I can't be bothered waiting, and going backward and forward to the dealer. Just take it on the chin; it's a hefty dunt, but at least he car will be sorted for the sort of things I want to do. Remember, I was the guy who said, "I'll never mod my car, there is no need". Idiot.
thewelsho Posted October 31, 2007 Author Posted October 31, 2007 Might as well stick some uprated rods in there while you are doing the pistons. More ££££s Pffff"!!!
iainc Posted October 31, 2007 Posted October 31, 2007 Glad to hear you got to the bottom of it. Might cost you cash to get it sorted bt hopefully you will now have confidence in the car again when you get it back (faster and more powerful too )
coulty Posted October 31, 2007 Posted October 31, 2007 More ££££s Pffff"!!! Very true mate but once you do them the pistons and uprate the bearings then you can stay worry free whatever standard position turbo you decide to throw at it in future. The bigger costs are all the labour and other bits like gaskets etc etc
andrew_forrest Posted October 31, 2007 Posted October 31, 2007 Don't really know what caused it to break, maybe the 2.5 is made of chocolate. Maybe running too much power, maybe the fact that I was low on oil on two seperate occaisions on track, or maybe it was faulty. It would be interesting to find out what the individual piston-bore clearance was on the original build when its away getting measured. These 2.5's run extremely tight bore clearance and some even in standard tune manage to 'nip-up' and crack a piston ring support land. The pistons also rely on oil cooling of their underside, low oil levels not only risk bearing failure but on track the oil temperature will increase quicker, further reducing the bore clearance. When you done your track days on 95 Unleaded, the ECU would retard the timing causing even more combustion heat build up. The std rods will be fine with up to around 430bhp which is beyond what your gearbox and clutch will cope with, so unless you intend uprating them too then just doing the pistons will be fine. I would however recommend that if you plan frequent track use that you fit a catch tank and an oil cooler. (you listening higgy ) Andy
coulty Posted October 31, 2007 Posted October 31, 2007 It would be interesting to find out what the individual piston-bore clearance was on the original build when its away getting measured. These 2.5's run extremely tight bore clearance and some even in standard tune manage to 'nip-up' and crack a piston ring support land. The pistons also rely on oil cooling of their underside, low oil levels not only risk bearing failure but on track the oil temperature will increase quicker, further reducing the bore clearance. When you done your track days on 95 Unleaded, the ECU would retard the timing causing even more combustion heat build up. The std rods will be fine with up to around 430bhp which is beyond what your gearbox and clutch will cope with, so unless you intend uprating them too then just doing the pistons will be fine. I would however recommend that if you plan frequent track use that you fit a catch tank and an oil cooler. (you listening higgy ) Andy lol higgy dont listen to anyone....not even you mate!
fai17 Posted November 1, 2007 Posted November 1, 2007 It would be interesting to find out what the individual piston-bore clearance was on the original build when its away getting measured. These 2.5's run extremely tight bore clearance and some even in standard tune manage to 'nip-up' and crack a piston ring support land. The pistons also rely on oil cooling of their underside, low oil levels not only risk bearing failure but on track the oil temperature will increase quicker, further reducing the bore clearance. When you done your track days on 95 Unleaded, the ECU would retard the timing causing even more combustion heat build up. The std rods will be fine with up to around 430bhp which is beyond what your gearbox and clutch will cope with, so unless you intend uprating them too then just doing the pistons will be fine. I would however recommend that if you plan frequent track use that you fit a catch tank and an oil cooler. (you listening higgy ) Andy Yes an uprated clutch,a "proper"oil catch can and an oil cooler with a thermstatic switch are all good ideas. Thanks Andy
fai17 Posted November 1, 2007 Posted November 1, 2007 That's fightin' talk! Bring your chariot to the first KH of next yearand we'll see who's the quickest! Ha!Thankd for all the positive comments, hopefully it will be sorted soon. Now now!!!!temper temper. John....are you going to go to Crail once it's all done to see what it can really do?
thewelsho Posted November 1, 2007 Author Posted November 1, 2007 John....are you going to go to Crail once it's all done to see what it can really do? I wouldn't make a habit of doing quarter miles, but yes, I will venture down at some point (early next year I guess) and post a time; just to see what it can do!
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