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4L sohc vs 3L duratec Dohc

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4L sohc vs 3L duratec Dohc

I'm planning on dropping in the 3L Mazda Dohc v6 and I found a tranny that fits just need to cut an inch back on the floor for the transmission, Wich would you guys think is the better motor, my other ranger has the 4l sohc and the third has the Lima 2.5, currently on the ranger I'm gonna swap has the 2.3 duratec dohc
 
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I would move the engine forward to get shifter in correct position, you need new motor mounts in any case
And use an electric fan on radiator

There is "no replacement for displacement"
This has been true for over 100 years now, lol.

If you want power then you go for more displacement
If you want MPG then you go with less displacement
Power to weight ratios still apply when going smaller.

Gas engines were about 25% efficient, they are creeping up to 30% with the swirl and 4 valve setups but still under 30% even with direct injection, so every $4 of gas you put in..$1 goes to push you down the road, and $3 goes to heat up the air and coolant, just physics, bummer

Diesel engines are better, they started at 30% and are above 35% now, approaching 40%
So if MPG is a concern then diesel is the only choice, turbo diesels are also getting better for performance

If you want power then you go with larger displacement gasoline, MPG diesel

So for the question, 4.0l SOHC engine would be my choice, already available
3.0l DOHC was not all that fuel efficient, better than 4.0l, problem with displacement, lol, but also not as good as 2.3l DOHC, and really not half way in between, for the MPG difference the 4.0l SOHC torque wins the battle, IMO of course
 

Last edited by RonD; 2 Weeks Ago at 12:53 PM.
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The 3l Dohc makes pretty much the same power as the 4l and I plan to stoke it out to 3.5 and twin turbo
 
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240 hp with 200-15ft lbs
 
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Aside from the chain on the sohc, are there any issues with the 3l
 
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I would look over at Taurus forums, we never had the 3.0l DOHC so no history

The 30 Duratec was first used in 1996 Taurus and used thru 2005 in that model
It was changed to 30 Duratec VVT(variable valve timing) in 2006 and used in other models until 2012
So its probably a pretty good base model engine for Ford to use it for 16 years
But never had one or even worked on one so can't say whats its problems might be
 
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It's the v6 used in the focus st I believe but it's a Mazda 6 3l
 
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Couldn't find anything on the swap
 
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If I'm successful I'll video and a step by step guide
 
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Don't see the 3.0l DOHC engine being used in a Focus

List of models it was used in here: https://en.wikipedia.org/wiki/Ford_Duratec_V6_engine

I don't think Mazda ever used the 3.0l, it was made for Ford, but was in the same family of engine as Mada 6, seen here: https://en.wikipedia.org/wiki/Mazda6


Build threads are always great to see
 
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It's a Mazda made engine not a Ford made, and it's also called the aj v6 3l for jaguar
 
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But pretty much at this point I do see a merger between Ford and Mazda being possible
 
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Mazda was in financial trouble in the 1960s, by 1979 Ford owned 25% of Mazda, and by 1995 35%, so there were alot of joint projects, i.e. Mazda B-series, which was a Ranger with Mazda badges from 1994 to 2008.

Mazda transmissions and engines were used in many Fords, Ford rebranded these engines as Duratec usually

Ford started selling off Mazda stock in 2008(the big economic crash), but still owns about 2% maybe less now

Mazda signed a partnership agreement with Toyota in 2015 for several joint projects
 
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With all the shared tech between Mazda an Ford I really do see it and I found a tranny that fits the bolt pattern to the enfine, I got a aj block for a jaguar with cosworth heads, and the tranny mounts up to the truck but need to move the 4 mount holes forward by 1 1/8" so that'll be fun, but means that I may be the first, when I get the electrical in(haven't bought yet I'll start working on it, I have a spare m5od r1 ready for the l4 duratec so mounting wise for tranny works, as for exhuast I'm gonna have it mate to one tube and do double cats down and end with a flowmaster, this is probably gonna take a good year as I usually only have about 2 hours to myself but money is not an issue not does the welding portion
 
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good luck getting the 3.0 DOHC to fit in the ranger engine bay. That engine is wider than your 4.0 with the single cam heads. Also that motor was never made for RWD applications
 
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The width shouldn't be too bad because of the lift, but with the exhuast I'm gonna short tube and have it straight out and at the end by the muffler, I'll probably have about 1/2 inch clearance to the hood and about 1-1 1/2 to the wheel well
 
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also...let it be known..the 3.0 isn't nicknamed the 3.leaker for no reason...timing covers, valve covers, oil pans all LOVE to leak
 
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That's my problem but I'll take care of it for sure but the power output is nicer then the 4l and room for improvement
 
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