Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB
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Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB (https://www.ft86club.com/forums/index.php)
-   Engine, Exhaust, Transmission (https://www.ft86club.com/forums/forumdisplay.php?f=8)
-   -   FB25 VS FA20 (https://www.ft86club.com/forums/showthread.php?t=126046)

Baramzisyan 03-13-2018 09:10 AM
FB25 VS FA20
 
hello! fa20 exhaust manifold to fb25 , will it fit?

celek 03-13-2018 09:23 AM
Yes same block height the F series are modular.
you can bolt a set of BRZ heads on a FB25 block, they have the same head bolt pattern.
Unknown at least to me is the front cover bolts and how they line up. between the 2 engines.
I should pop the hood on the 2018 Legacy 2.5i and take a peek at the cover to compare.

Baramzisyan 03-13-2018 09:30 AM
thanks! im interesting how brz exhaust manifold better then rxhaust manifold fb25 engine

celek 03-13-2018 09:52 AM
Quote:
Originally Posted by Baramzisyan (Post 3057534)
thanks! im interesting how brz exhaust manifold better then rxhaust manifold fb25 engine
Problem is the exhaust routing and engine cradle location differ in the 2 chassis. Not sure everything will line up the same.

Teseo 03-13-2018 10:40 AM
Quote:
Originally Posted by celek (Post 3057531)
Yes same block height the F series are modular.
you can bolt a set of BRZ heads on a FB25 block, they have the same head bolt pattern.
Unknown at least to me is the front cover bolts and how they line up. between the 2 engines.
I should pop the hood on the 2018 Legacy 2.5i and take a peek at the cover to compare.
Can i use FB bottom end with FA top and will increase the compression?

celek 03-13-2018 10:52 AM
Quote:
Originally Posted by Teseo (Post 3057556)
Can i use FB bottom end with FA top and will increase the compression?
In theory yes. I have been trying to locate a FB25 since about 2013 to confirm fitment. I have not validated the setup yet.

fika84 03-13-2018 12:03 PM
Quote:
Originally Posted by celek (Post 3057561)
In theory yes. I have been trying to locate a FB25 since about 2013 to confirm fitment. I have not validated the setup yet.
Wrong thread @celek ! Keep your eye on the prize! Back to work! :lol:

Teseo 03-13-2018 02:28 PM
Quote:
Originally Posted by celek (Post 3057561)
In theory yes. I have been trying to locate a FB25 since about 2013 to confirm fitment. I have not validated the setup yet.
If the FB have stronger bottom end than the FA i think would be worth to do the search/test.

celek 03-13-2018 03:54 PM
Quote:
Originally Posted by Teseo (Post 3057664)
If the FB have stronger bottom end than the FA i think would be worth to do the search/test.
The FB25 is actually worse shorter rods crappy rod to stroke ratio and smaller thinner rod bearings

celek 03-13-2018 03:55 PM
Quote:
Originally Posted by fika84 (Post 3057589)
Wrong thread @celek ! Keep your eye on the prize! Back to work! :lol:
:bellyroll::bellyroll::bellyroll::bellyroll:
I really want to switch it up for a 2.5 build if someone will by my 2.3

NoHaveMSG 03-13-2018 04:01 PM
Quote:
Originally Posted by celek (Post 3057712)
The FB25 is actually worse shorter rods crappy rod to stroke ratio and smaller thinner rod bearings
I was just about to reference your build as I had remembered reading that.

fika84 03-13-2018 04:05 PM
Quote:
Originally Posted by celek (Post 3057714)
:bellyroll::bellyroll::bellyroll::bellyroll:
I really want to switch it up for a 2.5 build if someone will by my 2.3
Wouldn't you still use your FA heads off your build? PS - what did you do to your heads at this point? Or has it all been bottom end work thus far?

nikitopo 03-13-2018 04:05 PM
The FB25 wasn't supposed to be a performance motor.

NoHaveMSG 03-13-2018 04:33 PM
Quote:
Originally Posted by nikitopo (Post 3057721)
The FB25 wasn't supposed to be a performance motor.
We will not be oppressed !!!

:burnrubber:


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