Early proposal: FA20 with a FB25 shortblock, .5l more displacement anyone? - Page 6 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Calum · 09-03-2013, 04:46 PM

Quote:

Originally Posted by jet86

So guys I have acquired a fb25 short block and I've got numerous fa20 heads. I threw the heads on the fb25 block and well.. they fit quite well. Only issues I can see with this setup is the combustion chamber may need to be ported (probably cnc) a you have to take it out 8mm bigger. And the other thing is the starter motor location is missing off the fb25. Everything else is identical.

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How's the total width compared to the fa20?

Will the oil pan from the fa20 bolt on to the fb25 allowing it to sit as low in the chassis?

jet86 · 09-03-2013, 05:29 PM

Apart from starter motor location and a random thread missing in the fb their identical externally

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Calum · 09-03-2013, 05:46 PM

Quote:

Originally Posted by jet86

Apart from starter motor location and a random thread missing in the fb their identical externally

Sent from my GT-I9505 using Tapatalk 4

Awesome!

Noob4Life · 09-03-2013, 05:53 PM

Quote:

Originally Posted by jet86

Apart from starter motor location and a random thread missing in the fb their identical externally

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No pics?

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jet86 · 09-03-2013, 05:56 PM

I picked it up last night so didn't have very good lighting for pics. Il take some this arvo and probably make a new thread on it.

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Kostamojen · 09-04-2013, 02:10 AM

Get pics ASAP!!!

Check the coolant passages too between the head and the block, use the headgaskets to check.

NYCsubaruBRZ · 09-04-2013, 04:47 AM

lets do this!!!!!

3MI Racing · 09-05-2013, 11:19 AM

Without getting into detail, there are 'issues' with it. It isn't like comparing EJ engines where it was basically bore and stroke changes within the same block.

-Micah

Calum · 09-05-2013, 12:10 PM

Quote:

Originally Posted by 3MI Racing

Without getting into detail, there are 'issues' with it. It isn't like comparing EJ engines where it was basically bore and stroke changes within the same block.

-Micah

Ok. So is it reasonably possible? Or is this off the able for most of us?

3MI Racing · 09-05-2013, 02:54 PM

It wold be possible, sure...would I see it as something marketable, no. I'll hold off and see what the factory turbo engines offer before sinking into it.

Heck, people aren't even into playing with the available longer stroke crank (would make it a 2.1) nor playing with cylinder heads...hint hint

-Micah
'Homemade WRX'

Calum · 09-05-2013, 06:45 PM

Quote:

Originally Posted by 3MI Racing

It wold be possible, sure...would I see it as something marketable, no. I'll hold off and see what the factory turbo engines offer before sinking into it.

Heck, people aren't even into playing with the available longer stroke crank (would make it a 2.1) nor playing with cylinder heads...hint hint

-Micah
'Homemade WRX'

More stroke on this engine doesn't seem like a good idea to me, the stroke to rod ratio is already bad enough from what I understand. Do you feel the longer stroke would be a good idea? What do you see in the heads that can be improved upon? Are the FB heads better in some way?

We've had too many conflicting stories from people that have shown themselves to be untrust worthy. An educated opinion would be really nice. At this point there are just too many unanswered questions for me to even begin to know where I'd like to end up power wise. Hell, I don't even know if I want to stay NA or go FI yet.

Dimman · 09-05-2013, 08:58 PM

Quote:

Originally Posted by 3MI Racing

Without getting into detail, there are 'issues' with it. It isn't like comparing EJ engines where it was basically bore and stroke changes within the same block.

-Micah

Would you by any chance have a stock FA20 CFM number (@28" of water or other pressure reference) that could be shared?

boxer 2.5 · 09-18-2013, 03:09 AM

k so the guy doing the franken motor needs to link us to his thread with pics a.s.a.p

Deadspool · 10-25-2013, 12:01 PM

Subbing for future developments.

My shits going to blow eventually. This is the research ill be turning to.

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09-04-2013, 02:10 AM	#76
Kostamojen Senior Member Join Date: Oct 2011 Drives: 1993 Impreza w/ WRX Swap + FWD! Location: Roseville, CA Posts: 2,071 Thanks: 217 Thanked 951 Times in 500 Posts Mentioned: 31 Post(s) Tagged: 0 Thread(s)	Get pics ASAP!!! Check the coolant passages too between the head and the block, use the headgaskets to check.

09-04-2013, 04:47 AM	#77
NYCsubaruBRZ Banned Join Date: Sep 2012 Drives: 2013 Subaru BRZ & 99' Ford Explorer Location: NYC Posts: 709 Thanks: 94 Thanked 86 Times in 65 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	lets do this!!!!!

09-05-2013, 11:19 AM	#78
3MI Racing Pro Subie Engine Nerd Join Date: Feb 2012 Drives: empty spot for an FR-S/BRZ Location: Virginia Posts: 96 Thanks: 8 Thanked 36 Times in 19 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Without getting into detail, there are 'issues' with it. It isn't like comparing EJ engines where it was basically bore and stroke changes within the same block. -Micah

09-05-2013, 02:54 PM	#80
3MI Racing Pro Subie Engine Nerd Join Date: Feb 2012 Drives: empty spot for an FR-S/BRZ Location: Virginia Posts: 96 Thanks: 8 Thanked 36 Times in 19 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	It wold be possible, sure...would I see it as something marketable, no. I'll hold off and see what the factory turbo engines offer before sinking into it. Heck, people aren't even into playing with the available longer stroke crank (would make it a 2.1) nor playing with cylinder heads...hint hint -Micah 'Homemade WRX'

09-18-2013, 03:09 AM	#83
boxer 2.5 Senior Member Join Date: Aug 2013 Drives: 2007 Impreza, 2013 BRZ Location: Vernon, CT Posts: 314 Thanks: 240 Thanked 119 Times in 78 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	k so the guy doing the franken motor needs to link us to his thread with pics a.s.a.p

10-25-2013, 12:01 PM	#84
Deadspool Much title. Wow. Join Date: Mar 2013 Drives: 2013 BRZ Sport-Tech Location: Edmonton, AB Posts: 716 Thanks: 118 Thanked 292 Times in 163 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	Subbing for future developments. My shits going to blow eventually. This is the research ill be turning to.

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