JDM KF-ZE vs JDM KF-DE, Curved/Straight Neck, Really? - Mazda MX-6 Forum
 
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post #1 of 4 (permalink) Old 9-10-19, 18:59 Thread Starter
 
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JDM KF-ZE vs JDM KF-DE, Curved/Straight Neck, Really?

Looking into a KF swap for my MX-3, and I notice both KF-ZE and KF-DE's on eBay. Then, there are the IM's, straight neck or curved. Well, being an MX-3, I would prefer the curved neck (but not important as I CAN just use my K8 curved neck IM).

Anyway, I have poked around, and never seen any distinctions with ZE vs DE for KF's. Is there any possible difference, assuming both are really JDM (I didn't think ANY KF's came to the US, but thought "DE" indicated for US)?

To head off KL gripes; I don't really want to have to change my exhaust or ECM to make use of a 2.5L V6, and thought a 2.0L would match up OK.

I still haven't even ruled out a K8-ZE either; not completely.

I suspect a KF "DE" might have lower compression than a 10.0-1 ZE, which would be fine by me if so, as I don't really want to be pumping Premium fuel.
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post #2 of 4 (permalink) Old 9-11-19, 13:45
 
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Wikipedia says there's a 140hp KFDE, as well as the 160 (or 170) hp KFZE.
I think the main difference is a higher compression ratio for the ZE (so it needs premium gas).

The K engines were sold in lots of different countries, so some non-US countries probably got the KFDE, in various cars.

https://en.wikipedia.org/wiki/Mazda_K_engine
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post #3 of 4 (permalink) Old 9-11-19, 13:50 Thread Starter
 
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Hi NickR; Wikipedia also says both versions have the same 132ft/lbs torque; so, is there any real advantage to the KF-ZE higher horsepower version?
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post #4 of 4 (permalink) Old 9-11-19, 15:04 Thread Starter
 
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I am noticing most of the engines listed as DE's have curved necks. Hey Nick, wanted to ask about EGR's. Does one need to have an intact and working EGR system to pass emissions? I saw someone wrote to connect the wiring to the EGR (to fool the ECM), but, just let it dangle (I guess) where there is no port on the swapped in IM for the EGR. What do YOU think Nick?
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