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Old 11-11-2010, 06:21 PM   #1
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Rod and piston (forced induction question)

Ok, so can some people explain this to me.... for the zetec engine, is it that to run more boost in the engine than the safe 8psi you have to upgrade the rods and pistons and that is it? or do I have to replace more.

I have heard the reason why is because the rods can start to bend if you go past 9psi or w/e.

Do i HAVE to upgrade the springs and camshafts? or can i just stick with the stockies?


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Old 11-11-2010, 06:56 PM   #2
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As far as the rods and pistons? When going for boost it is always a good idea to get ones meant for boost. It's better then taking the risk and having to pull it all back apart when you think there is something wrong.


As for the cams/springs, they have been proven to last when making 500 HP,or 300 HP. I forget I need back up on the exact HP but I am pretty sure they have been proven to 500 HP.
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Old 11-11-2010, 06:59 PM   #3
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well imean im just looking to get eagle rods and probe pistons (standard bore)
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Old 11-11-2010, 07:02 PM   #4
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Eagle rods and Probe pistons will work great. They're all you need for a built motor. Just remember to replace alll the gaskets and bearings. You typically don't want standard bore unless you're positive your cylinder walls are perfect. Otherwise, .007" overbore is good.
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Old 11-11-2010, 07:04 PM   #5
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We seen alot of zetecs run 12psi safely .... depending on the turbo you're in the 240/240 range.
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Old 11-11-2010, 07:06 PM   #6
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Yup^ agree, And when I did my stock pistons I got them to .004 clearance.
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Old 11-11-2010, 07:17 PM   #7
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Boost has pretty much nothing to do with it, it is power and more importantly torque that you should be concerned with. Torque is the most most important thing to look at because it is the only measurable force a motor makes, horsepower is simply the application of torque over rpm. The further you carry your torque the more power you will make. A motor that makes 300whp but only 200wtq should last longer and be less strain on the internals than a 250whp 250wtq.
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Old 11-11-2010, 07:55 PM   #8
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well i mean if i become boost hungry is all i have to replace is the pistons and the rods? no need to reaplace the head or the block is there?
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Old 11-11-2010, 08:20 PM   #9
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^^not unless you get waaaay carried away.

work with what you got now. let me know when your going to do the install.
make sure you got everything needed before we start
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Old 11-11-2010, 08:30 PM   #10
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Quote:
Originally Posted by scrammer View Post
^^not unless you get waaaay carried away.

work with what you got now. let me know when your going to do the install.
make sure you got everything needed before we start
yep i will. I am just going to install the turbo kit and that is it.

This question was just intended for later use.

I'll prob put in the rods and pistons in spring time when my tax returns come in. but for now all i need after i get the turbo kit is:

the stainless steel lines for oil feed and return
AEM wideband
Injectors
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