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post #1 of 6 (permalink) Old 02-19-2008, 03:53 PM Thread Starter
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first thing to fail?

whats the weakest link on a 4.6L when supercharging?

what is going to break first on the bottom end?

Ed
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post #2 of 6 (permalink) Old 02-19-2008, 04:48 PM
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Most likely it will be the pistons. The compression height on 4.6 pistons is very thin, plus they aren't forged, and they are directly exposed to the added heat and pressure from the supercharger. A good tune will help this, as running lean under boost will kill the pistons even faster. If the pistons don't melt/break, the powdered metal rods would be next in line to go. The crank on the other hand is pretty strong.

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post #3 of 6 (permalink) Old 02-19-2008, 05:28 PM Thread Starter
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cool good post

thats exactly what i was looking for...

so its a stock 95 bottom end, and figured while we are down there to fix the weakest link, i dont have enough dough for a forged bottom end...

but a friend was thinking the crank was the weakest, but i wasent sure

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post #4 of 6 (permalink) Old 02-19-2008, 06:01 PM
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Definitely not. If you feel up to taking the motor apart, I'd suggest you get forged pistons and some stronger aftermarket rods, as well as new main and rod bearings. The pistons are going to cost a bit for forged ones, but stronger rods aren't that expensive, so you might as well replace them while you have everything apart. To do this, it wouldn't actually cost you that much money, mostly just time, and then you would know that you aren't going to have some catastrophic failure at the worst possible time. The most expensive part would be the pistons.

-91 Cougar LS, coming soon, complete overhaul with a 427" Windsor.
-90 XR7 5-speed black on black w/sunroof, MP2, coated rotors, double intercooler, 15%OD, ported heads, comp stage 1 cam, 85mm TB, 90MM LMAF, 80# injectors, and ported big valve heads
-98 Mark VIII LSC, Procharger P600b, TR3650 swap and 3.73s.
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post #5 of 6 (permalink) Old 02-19-2008, 06:22 PM Thread Starter
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thats the debate we had today while taking the engine down to a short block

i love when i crack open a 160k+ engine and still have cross hatching and hardly any lip at the top of the cylinder.

yeah ive been pricing pistons and rods , pistons are def. more expenisve than rods...

thanks for the help!

Ed
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post #6 of 6 (permalink) Old 02-19-2008, 07:05 PM
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The stock bearings leave a lot to be desired as well.

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