Duratec / Mazda L-Series MZR I4 2.0 / 2.3 / 2.5 Swap

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my8950
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Re: Duratec / Mazda L-Series MZR I4 2.0 / 2.3 / 2.5 Swap

Post by my8950 »

DPDISXR4Ti wrote: Tue Jun 13, 2023 9:54 am Today's Duratec tid-bit.... As mentioned earlier in this thread, Esslinger sells a Duratec to SBF bellhousing adapter which allows you to use most any transmission which would bolt up to a Small block Ford.
https://esslingeracing.com/ford-4-valve ... -adapter-1

While pricey at $385, what really makes it an expensive solution overall is that it requires a special starter at $550. Or not....
yes, you can clearance the block with a carbide burr bit and die grinder. Then you can use a regular sbf starter. That's what we did
Adam Lucas Pohl
Don't forget the huge chunk that you need to bolt on the back of the crank as well to space it out, Esslinger only...
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Re: Duratec / Mazda L-Series MZR I4 2.0 / 2.3 / 2.5 Swap

Post by DPDISXR4Ti »

my8950 wrote: Wed Jun 14, 2023 8:25 am Don't forget the huge chunk that you need to bolt on the back of the crank as well to space it out, Esslinger only...
True, but at least that's somewhat reasonably priced at $140.

https://esslingeracing.com/ford-4-valve ... nk-adapter

I'd likely only go this route if I was replacing an engine with a SBF pattern with a Duratec 2.5. I'm actually considering such a thing - replacing the 4.9 in my F150 with a 2.5. Yes, it's a crazy idea, but I like crazy ideas. :mrgreen:
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Re: Duratec / Mazda L-Series MZR I4 2.0 / 2.3 / 2.5 Swap

Post by DPDISXR4Ti »

DPDISXR4Ti wrote: Mon Jan 30, 2023 11:45 am Currently there is no bell available to mount a T-5 directly to the MZR. One did exist in the past from Quad4rods, and one may exist in the future, but today, no.
As I knew at the time, a T-5 bell for the MZR was under development, and it is now available.
https://www.rwdmotorsport.com/product/d ... llhousing/
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Re: Duratec / Mazda L-Series MZR I4 2.0 / 2.3 / 2.5 Swap

Post by DPDISXR4Ti »

DPDISXR4Ti wrote: Mon Jan 23, 2023 3:10 pm I had been under the impression that all the 2005-2011 2.0 Focus engines were the same, but it appears that may not be the case, as outlined here:
https://sbdmotorsport.co.uk/product/dur ... formation/

In short, the 2008+ heads have a high-port design which should flow a little better. The high port castings numbers are RF3S4G (AKA 3S4G) and RF6S4E (AKA 6S4E). The earlier (low port) head is the 1S7G. Note, this info comes from the UK and may or may not be exactly the same in the US.
Upon further review it would appear that the information provided above ^^^ is incorrect for the North American Focus. Apparently the US Focus continued to get the low port 1S7G head all the way through 2011. To the best of my (now updated) knowledge, the only thing the 3S4G head came in on US soil was the 2003-2007 Focus ST with the 2.3.
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Re: Duratec / Mazda L-Series MZR I4 2.0 / 2.3 / 2.5 Swap

Post by DPDISXR4Ti »

DPDISXR4Ti wrote: Mon Nov 20, 2023 2:58 pm Upon further review it would appear that the information provided above ^^^ is incorrect for the North American Focus. Apparently the US Focus continued to get the low port 1S7G head all the way through 2011. To the best of my (now updated) knowledge, the only thing the 3S4G head came in on US soil was the 2003-2007 Focus ST with the 2.3.
When I was junkyarding recently I tried to see if you can see the head casting# with the engine installed in the car. Since the number is on the exhaust side of the casting, I'm thinking it's pretty near impossible with a FWD car like the Focus. Maybe with a mirror?

BUT, perhaps it can be determined by the sticker on the front of the engine. Below is a picture of said sticker, one from a 2.3 Focus and the other from the much more common 2.0. We know the 2.3 has the 3S4G head and the sticker has "3G" as the start of the litany of numbers. The sticker on the 2.0 does not have "1S" anywhere on it, but perhaps that doesn't matter; maybe the 2.0 engines with the 3S4G heads will have "3G" like the 2.3? Sadly, with the info I have now though, it would seem that engine may only have existed in Europe. You could "create" one easily enough in the States by plunking a 3S4G head onto a Focus 2.0 engine.
FocusDuratecHead-2.jpg
FocusDuratecHead-2.jpg (378.32 KiB) Viewed 5546 times
FocusDuratecHead-1.jpg
FocusDuratecHead-1.jpg (334.99 KiB) Viewed 5546 times
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