Can you turn a Alumn 4.6L 3V sohc into a 5.0
10/23/13, 06:33 AM
#21
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Its doable and I'd assume rare! Sounds cool! And yeah aren't there crazy 2v powerplants? I think it'd be awesome to see a, deserving, "302 High Output" badge on the side...
If you build, keep us updated!
If you build, keep us updated!
10/24/13, 10:25 AM
#29
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I understand what you are saying. And with the advent of variable cam timing, going back to DOHC has given more control throughout the power band from idle to WOT.
However - the nagging thought in my mind is:
a) the DOHC has the parasitic drag of 2 more cams, 8 more (exhaust) valve springs; and
b) what power do you really gain from 16 small exhaust valves over the 3V's 8 large exhaust valves when port and polish on the 3V heads would be for max breathing - plus I believe equal length long tube headers should negate any exhaust breathing differences; and
c) really the TiVCT variable cam timing on the DOHC only helps for improved low end torque and emissions (while retaining maximum performance at WOT) when you consider the SOHC 3V build would include high performance cams for max valve timing overlap at WOT anyway. Most builds use phase limiters to help retain some of the low end torque from VCT function, but the cams would be for high performance at WOT.
Also keep in mind, the OP is referring to a custom build on an SOHC 3V to bring the displacement up to 5.0L compared to the stock Coyote 5.0, as I understand it. So the 3V would need to spin up to 7k redline. Which shouldn't be too difficult since Ford took redline from 6250 on the GT to 6500 on Bullitt with the only change being the harmonic balancer. Better valve springs may be involved for that last 500rpm.
10/24/13, 09:39 PM
#31
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The PJ motor was built pretty much that way; they took the 4.6 3v and and added a stroker crank, pistons, and rods, hotter cams (still emissions legal) , a valve spring upgrade and cleaned up the heads around the valves a little. Everything else was stock. They got 400 hp. Probably could've gotten a lot more if they weren't trying to meet emission standards.
http://www.mustang50magazine.com/tec..._engine_build/
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