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How to build a 4.0 OHV for power, some limits and tips...


Biggfoot44

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Intresting thread .

So all years had the same CR , but the "95 up heads have 10cc smaller chambers, the difference being in the piston dish . Presumably putting later heads on an early engine would give a compression increase ? Would this be viable/ worthwhile ?
 


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GoGoggansGo

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Intresting thread .

So all years had the same CR , but the "95 up heads have 10cc smaller chambers, the difference being in the piston dish . Presumably putting later heads on an early engine would give a compression increase ? Would this be viable/ worthwhile ?
lol i haven’t been active on here since 2012 and got bored. The short answer would be no, the OHV 4.0 wouldn’t gain a lot by doing a head swap from the later castings. Even if the compression did go up and I’m sure it does Ford must of gone it’s not worth talking or re certifying the engine over
 

Angie

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Incase any one is looking for the Upgrading V6 article. here is a media link to a pdf of mine. cheers

 

GabrielBR

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For the later model 95-up OHV's using the larger SOHC maf which is 65mm in Diameter works great.

Is it easy to find on ebay or amazon?
How about the MAF sensor, does it have the same conector?
 

stsalvage

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Ive used Jet products and i would recomend not too. i disagree with the pistons being "weak" ive yet to break a piston. My NA 4.0 suffered from overheating that cause "the death rattle" while taking a hill. Detonation so bad it blew the gasket out in many areas, smashed the middle combustion chambers of the head sideways into the head, cracks everywhere. coolant pooring out the exhaust, cracked/chipped valves. Yet the bottom end was 100% reusable. My current 92 oem longblock was pushed with over 15psi of boost from a t3 turbocharger on a few occasions and fed with 5 psi daily. The 4.0 obtains that level of boost before 2500. It has 100% oem fuel managment and ecu drawing thru the oem maf with no 02 feedback. It allso rattled a few times under high boost. I just pulled it apart and bank 2 had a small coolant leak into #6. New headgaskets and good to go. can a cast psiton break sure they can but Ive only seen a few pics so far of failed 4.0 pistons

I've found out the pinging when you take a hill is because of Octane I ran 87 in mine at fist but it hated the 87 now I run the 89 much better less pings. I know it would run better on 91 But I'm not that rich.
 

Dirtman

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You know what helps stop pinging? EGR valves...

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alwaysFlOoReD

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I didn't think the egr was engaged under wide open throttle, like going up a hill?
 

snoranger

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I didn't think the egr was engaged under wide open throttle, like going up a hill?
I’m pretty sure that was to bust stsalvage’s balls... hes posted at least half a dozen times that the EGR valve is the brainchild of Satan himself and should be avoided at all costs.
 


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