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SVT Performance (2002-2004) The place to chat about any 2.0L SVT DOHC Zetec engine performance, tuning and exhaust related upgrades.

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Old 03-04-2019, 01:07 PM   #1
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Piston Questions ZETEC/SVT

I have a 2004 svt eap focus I'm restoring bought with a blown HG

Fast foward to teardown and machine shop visit

I bought a rebuild kit and it has the zetec style piston, the block is .50mm overbore and The machine shop pressed on the pistons. The head was cut lightly 57cc is stock? I'm about 54cc and the piston is around .015 outta the hole block was cleaned up also

So with this being said anyone run svt stock rods and zetec pistons?

so far no search has yeilded anything and right now I'm looking at around 10.6 cr on Rsr static compression ratio calculator.


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Old 03-04-2019, 02:16 PM   #2
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The SVT rods are longer then the Zetec and a slight diff on the compression height

You need SVT Pistons

Tom
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Old 03-04-2019, 09:27 PM   #3
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where does one find the information?

the rod length for most aftermarket rods is 5.483 which is the same as stock? and lists zetec and svt? and compression distance is on engine tech pistons is 1.157 and je pistons is 1.171 .014 thou difference ,

So running svt rods with the magical piston offset thats the only option because doing some math and having the short block done seems to be yeilding 10.25 cr on a svt head, and a stock aztec head gasket which is what .027 thou and the svt one is .040? combustion chamber size is also extremely close as well but once again I've seen 42cc stock all the way up to 57.7cc i checked my head and its 54 and its been cleaned up. valve size is stock but once again i read somewhere its 1mm bigger?

Maybe I'm being a optimistic, But so far 2 million people say this won't work but Ill be torquing the head down tomorrow and timing everything tommorow night once my 2.0 timing kit comes in the mail.

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Old 03-05-2019, 07:40 AM   #4
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These are the rod lengths I have gathered from research... copied from a dead thread,
5.36" 136.1mm Silvertop stock rod
5.54" 140.7mm Blacktop stock rod
5.476" 139.1mm American stock rod
5.475" 139.07mm Pauter rod
5.482" 139.24mm Crower rod
5.483" 139.27mm Eagle rod
5.878" 149.3mm K1 tech rod
cheap sleeper likes this.
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Old 03-05-2019, 09:46 AM   #5
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Your reading some misinformation then trying to convince your self there the same and the Zetec rods vs the SVT rods are not the same and why your now .015 out of the block

The aftermarket rods (eagle etc) and Forged pistons correct the issue , if you put the forged pistons on the stock SVT rods ( wrist pin size issues ) the piston will be out of the block as well , the Zetec/eagle rods are shorter and that allows the forged pistons to work

Yes the SVT has bigger valves and with the piston that much closer .025-.035 closer to the valves you need to be very careful because the SVT is an interference engine

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Old 03-05-2019, 10:19 AM   #6
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not head strong here , so whats the next logical step besides torque the head and then install everything and measure ptv clearance and adjusting with a different head gasket?

will she ever hunt?
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Old 03-05-2019, 03:20 PM   #7
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Its been done just check the PTV clearances well and keep the compression in the 10.2-10.4 range

You will need a custom tune with datalogging and wideband to keep it safe

Tom
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Old 03-05-2019, 05:09 PM   #8
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ok that I'm doing , thats refreshing. Ill post in here to keep this alive with any good information i can offer, thanks 1turbofocus tomorrow we should find out!
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Old 03-06-2019, 01:13 PM   #9
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Belts on and everything torque to spec, spun it over no issues and Im tearing it down with my students tommorrow to check clearances, and go over a few things,

Should I refuse the head gasket or buy a new one?
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Old 03-06-2019, 02:59 PM   #10
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If it wasnt started you can reuse the HG , I would paint it

Tom
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