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Old 12-23-2007, 08:13   #1 (permalink)
HAQ
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Strait 6 Help

I have a 3.9L MPEFI EA S-pack 4spd auto sedan with 3.23 (manual) diff ratio.
I'm planning on fitting the EA 3.9L head on an EF 4.0L block but sticking to the EA timming case and belt system. my question is witch camshaft to use? I here the EBII is the better one but the EA cam has more lift, will there be enough valve clearance? any suggestions would be much appreciated.

OT: After the engine is fitted i'll look into retrofitting an EF intake, i'm also aware that the AU thermo fans will fit right in without having to change to EF timming case and beft system.
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Old 12-25-2007, 08:12   #2 (permalink)
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Re: Strait 6 Help

Quote:
Originally Posted by HAQ
I have a 3.9L MPEFI EA S-pack 4spd auto sedan with 3.23 (manual) diff ratio.
I'm planning on fitting the EA 3.9L head on an EF 4.0L block but sticking to the EA timming case and belt system. my question is witch camshaft to use? I here the EBII is the better one but the EA cam has more lift, will there be enough valve clearance? any suggestions would be much appreciated.

OT: After the engine is fitted i'll look into retrofitting an EF intake, i'm also aware that the AU thermo fans will fit right in without having to change to EF timming case and beft system.
You are doing your self a dis service by using the older head , purchase a suitable ef/l unit complete of a wreck ( cheap enough) just watch for signs of over heating and softening .
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Old 12-30-2007, 04:36   #3 (permalink)
HAQ
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Re: Strait 6 Help

3.9L head gives a much better compression ratio and is suitable for the EEC4 ( EA computer ), my main concern is with valve timming, i have built one of theese engines before with ~170-180 kW useing the ED XR6 camshaft but the engine timming was a little unorthadox. I want to get it right this time.

PS. I'm not looking at replaceing the engine, just want to update with the EF crank and pistons wich have the added side effect of heaps of compression when the smaller cc ( 3.9L head ) is bolted onto it. BTW the S pack has an S spec head wich can be identified by the 3.9L S signature on the front of the head
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Old 01-08-2008, 14:33   #4 (permalink)
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Re: Strait 6 Help

hi, yes use the ef/l head, ea comb chamber hurts flow(too much valve shrouding). fit the ef/l intake(watch out for isc to bonnet clearance!) and use el engine wiring harness and computer(ef if you want to change to coil pack ignition). the el computer is, basically just smarter than the ea/b/d computer so it is capable of running a more modded engine. use 2222519 crow cam and pace maker 4480 extractors with 2.5 inch exhaust with ultraflow muffler. use the el intake tube and air box(not pod filter) and ensure lots of cold air via good intake snorkel(ss inductions or similar) then it will go well! you then have more scope for future mods such as bigger cam etc as the ef/l computer can then be tuned better aswell. thanx.
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