What can the stock 4.6 take? - TCCoA Forums
 
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post #1 of 6 (permalink) Old 11-25-2003, 11:28 PM Thread Starter
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What can the stock 4.6 take?

What can our stock 4.6L blocks take, stock heads aswell. Also, what gains can be expected when running the stock block at boost it can handle, maybe 50 hp? I ask because I want some more power and plan to get a KB unit down the road anyways... and since I plan to build up a seperate block with forged internals and ported heads and cams I figure I can just transplant the blower over when I have the money for the new bottom-end.

So are they safe at say 6psi stock, I plan to run 12-14 when built right...

Thanks,
~Kris

95' Nissan 240sx
94' Mazda RX-7
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post #2 of 6 (permalink) Old 11-26-2003, 12:41 AM
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Duno...they say i am pushing my luck at 89K with my 6-8psi Vortech kit. But i just started the install today....so stay tunned kids, disaster may strike!!!

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TEA Stage2 PI Heads, 9.5:1 manley slugs/manley H-beams, cobra crank, VTStage3 blower cams, Trick Flow track heat intake, FMIC TR1245 intercooler, ART Dual 2.5" exhaust/Stainless/no cats, KOOKS coated headers, 4.10 w/ Auburn Pro, aluminum 8.8 housing, Dynotech driveshaft, Koni's, Eibach Springs, Baer 13" big brake kit. cobra rear brake/hub conversion, VMP Slot Blowthru setup, #60 Inj. 75mm TB,
615 rwhp/500 torque 15.5psi best of [email protected] still needs tuning.
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post #3 of 6 (permalink) Old 11-26-2003, 08:22 AM
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If you look at most of the folks who have run the AED 6 seems just fine with the right tune. Everyone who has pushed it to 9 has lost pistons.

Birdless

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post #4 of 6 (permalink) Old 11-26-2003, 12:50 PM
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There seem to be lotsa guys running 6psi with high mileage, stock bottom ends... But I don't think that's a guarantee, "anything" can happen when you add boost...

96 GoldBird

'96 T-Bird LX 4.6L Alive & well & living in S. Florida

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Pump Gas Numbers - 547 rwhp / 525 ft.lbs; Best Time - 11.388 @ 118.68 (Commerce, GA - November 2007)
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post #5 of 6 (permalink) Old 11-26-2003, 04:45 PM Thread Starter
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Well KB says the nonIC is good to 6 on pump gas and the IC kit is good to 9 on pump gas... something to look forward to.

~Kris

95' Nissan 240sx
94' Mazda RX-7
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post #6 of 6 (permalink) Old 11-26-2003, 05:24 PM
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Kris,

I've seen a few naturally aspirated 4.6L 2V engines with broken ring lands on the hyperpathetic pistons. I'd say 6-psi of boost with an intercooler, a good fuel system and a GOOD dyno tune could go many, many miles on a stock 4.6L. Then again, drop fuel pressure at WOT and go lean...it may last a few seconds.

The weak link is the pistons and the connecting rods. If you plan on any boost and you want longevity, I would consider forged pistons and forged rods. You may want to even use a forged Cobra crankshaft to be safe.

I ran 6-psi with the AED kit for two years on the stock '95 ROMEO 4.6L. I then switched to a smaller pulley and even with a good EEC program, I lost a ring land on the piston (passenger side) in about six months.

I now have a '00 4.6L GT engine in the T-Bird (it has the same garbage internals as the '95) and for two years now I've been at 10 psi of boost. I expect it to grenade one day, but for now, she runs great.

So be WARNED...its not "if" it will break...but when.

A-Train

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