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Old 08-22-2010, 02:09 PM   #1
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Svt & Zetec Differences

I have an 03 svt focus with a blown bottom end, Id like to get the car back up and running but dont feel like spending thosands to get new pistons and bearings and all the block work done.My friend who uses the regular zetec motor in his open wheel race car and can get brandnew engines, oil pan to throttle body, for cheap, so heres my question.

The rods are different in the zetec engine, and it doesnt have the oil squirters, but as far as the bottom end goes are there any other differences?

I have a brand new svt head and cams, so I was think of buying a zetec engine, and just swapping my top end parts over to it. The car is just a daily driver and wont be beat on, so should the regular zetec rods take it?

What do you all think?


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Old 08-22-2010, 03:39 PM   #2
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I am not that experienced with building engines but I don't think that even if it worked it would run very well.
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Old 08-22-2010, 05:17 PM   #3
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You would be lowering the compression and going to a much weaker rod other then that it would work

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Old 08-22-2010, 05:28 PM   #4
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Well with the right head gasket, I think i could get the compression fairly close, again the car is just a daily drive and wont be beaten on so im not looking for power.

Do you think the rods will take it?
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Old 08-27-2010, 06:15 PM   #5
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The rods will definatly take it...the stock zetec rods are good to about 300hp...for how long that would last is a different story. but you wouldnt have to worry about a thing if you keep it any where below 240 or 250 whp
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Old 08-27-2010, 07:49 PM   #6
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correct nme if im wrong, and there is a great chance that i am, but isn't the svt head a interfence design, and the ztec is not, so if you messed with compression via head gasket you might be asking for trouble with the different piston design. again jsut thinking out loud here, but you might want to clay check your valve clearence before you fire it up.
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Old 08-28-2010, 05:57 PM   #7
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The zetec bottom end is the interference part. I used svt piston with a bone stock focus head and timing bent all the valves wen a belt broke. And when I used a svt head after damage was worse....a svt head on a non svt blocking is not interference when heads not shaved or massive cams aren't used....svt piston do not have exhaust valve relief
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Old 08-28-2010, 06:01 PM   #8
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Zetec non svt bottom end won't have collision issues between piston and valves. Won't cause damage with svt head and standard bottom
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Old 08-30-2010, 01:22 AM   #9
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I think you'll see a small power gain out of using the stock Zetec block w/a standard Zetec head gasket. You'll be an interference motor at this point though.
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Old 08-30-2010, 02:33 AM   #10
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300HP on a stock Zetec rod, that would be pushing it to say the least 300 on a SVT rod yeah i could see that. But i wouldn't want to go anywhere over 240-250 HP on a stock rod with no improvements they bend pretty easy. They are really soft you can put them in a vise and a few taps with a hammer and they are bent. Not saing you couldn't go up to 300 in a perfect senario but it would worry me if i was beating on it.

Also you ought to rebuild your SVT bottom end. You can get oversized pistons for them well atleast i can. Tom probably knows a few places to get them also. Bore it .010ths or .25mm to clean up the cylinders, new rings and pistons, crank kit at the worst and you are ready to go.
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