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Old 12-09-2011, 01:09 AM   #1
Numbchux
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Default Swapping an FA or FB engine?

Anyone know anything about the FB/FA engines? or how they differ from the EJs?

I'm mostly curious about the bellhousing. If an FB or FA engine could be bolted to an EJ trans, or vice versa.

Here's an FB16 on display.....bellhousing LOOKS very EJish:
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Old 12-10-2011, 01:25 PM   #2
kheff46
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same bellhousing/bolt pattern as EJ.

--keith
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Old 12-10-2011, 07:23 PM   #3
pocketdrummer
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what's the difference between the FA and FB engines?
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Old 12-10-2011, 08:06 PM   #4
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the big issue will be the EM
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Old 12-12-2011, 03:19 PM   #5
kheff46
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i know FB's are timing chain engines designed like the EZ 6 cyl's, and have the oil filter up top where you fill up the EJ's oil(kinda neat imo). they have a distinct noise upon startup before the hydraulic tensioners are fully actuated, unlike EJ's.

EM is always the BIG issue it seems going from older to newer versions.

but tranny mount is same, the 5mt is still in use behind it when you opt for the manual trans instead of CVT.

--keith
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Old 12-12-2011, 04:44 PM   #6
Numbchux
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yep, timing chain and asymmetrical rods like the ez36.


I'm sure they are CANBUS systems, so standalone EM would be necessary. but I'm really happy to hear that it would bolt in place of an EJ.
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Old 12-13-2011, 12:05 PM   #7
kheff46
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i believe its all going that way(assym rods), but not sure about diesel rods. i would suspect "normal" rods for strength there, but who knows, they could be like older VW i4's... can switch from gas to diesel with a head swap(except EM)!?! that would be kinda sweet.

--keith
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Old 12-13-2011, 02:28 PM   #8
Marnix
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The Diesel rods are also asymetrical (which, by the way, does in no way influence the stroke or capacity of the engine, just makes installtion easier as they can be assembled with the piston already attached).
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Old 12-15-2011, 12:30 PM   #9
kheff46
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good to know Marnix! and you're correct, its just for speedy assy purposes.

do we know if the diesel rods are the same exact rod as the gas(diesel 2.0 and gas FB2.0)? or just assym.?

--keith
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Old 11-15-2014, 01:51 PM   #10
elcuerno
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How about engine mounts? I would think a new fb engine in an older impreza 5 speed would get 40 mpg easy.
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