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Old 07-03-2013, 10:23 PM   #1
jwgstang2112
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blown motor:(

hello i recently purchased an 04 focus svt with a blown motor and no details on how it happened... but i ran compression checks and no.3 cyl was like at 60 psi while the others were 130-140 psi and i took it apart today the piston in between the rings broke and the rings as well... it burned oil alot so i dont think the oil pump went out.. i was wondering why it went out at 136k miles what can be done to prevent it from happening again, and everything is bone stock.
any help is appriciated


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Old 07-03-2013, 10:33 PM   #2
jdmzx5
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Any evidence of a turbo installation? It was probably driven hard and rings usually break at high rpm. Give more info about the rest of the car and drivetrain, modifications etc. You will get more info. How about some pics too
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Old 07-03-2013, 10:40 PM   #3
jwgstang2112
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idk what i sould look for as far as a turbo instalation and pics are on the way
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Old 07-03-2013, 10:42 PM   #4
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its 100% bone stock it has a 6 speed manual trans and 2.0 its a zx5
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Old 07-03-2013, 11:11 PM   #5
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picture of the piston
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Old 07-03-2013, 11:39 PM   #6
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Picture of the cylinder, main bearings, rod bearings and cam caps, also lets see the valve margins and valve seats. Then I can give you probable cause.
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Old 07-04-2013, 12:05 AM   #7
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Some SVT have had the ring lands on the pistons let go. This has happened on boosted and n/a SVT's alike. Why it happens I dunno maybe detonation from bad gas or a bad tune I forget really since this happens every so often. I guess it's like the SPI valve drop problem only no where near as severe. There are SVT's with over 200k mi running around with no problems. Just rebuild it back to stock and you should be fine. You also may want to invest in getting a tune since the factory tune for the SVT sucks. You won't gain very much power but the driveability is greatly improved.
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Old 07-04-2013, 12:33 AM   #8
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Old 07-04-2013, 12:35 AM   #9
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what kind of tune lice sct tuner or...?
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Old 07-04-2013, 01:58 AM   #10
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I'm going through the same process right now. My SVTF leaned out (N/A, 67mm TB, Hi-Flow cat, Tom Tune). The cable that actuates the intake manifold runner was rotted and broke from battery acid and the original 135,000+ mile fuel pump is suspect. Whatever the issue, it leaned out on a top end WOT situation. #3 piston torched the entire north end, #2 piston was cracked 180* from each end of the wrist pin along the skirt. Bearings are perfect.
Nobody makes a forged SVT piston so I'm in the process of having Diamond Pistons make a set. Should be done inside of two weeks from today. I went 85mm which is about .006" over standard. The #3 cylinder had light vertical score that cleaned up with a hone. Going with 1mm top barrel face ring and 1mm napier second ring; both available from Total Seal. Using ARP rod bolts and new Clevite rod bearings even though the rod bearings looked dang near perfect.
Also bought ARP head studs instead of the TTY factory head bolts.
Having the factory cams reground by the guy that cuts my custom race cams for my AMC V-8. See www.redlineracingcams.com if your interested. I don't know the retail cost as I'm getting the buddy deal on the cams.
Replacing the IMRCM and cable, new fuel pump, filter, performance valve job while I'm at it. Finally, Tom Tune from my laptop when it's all together.
Can't wait to take it for a drive with the new parts!
I'll pass on the piston ordering info to Central Florida Motorsports so they can make these a catalog item.
I was absolutely against the zetek 130HP piston / rod conversion. Price wise it's a good deal but I feel the flame travel has to be considerably better with the SVT piston over the zetek piston. Plus I'm able to use considerably better rings with the 1mm / 1mm setup. And the Diamond piston is far superior to the SVT piston.
And then maybe the turbo....
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