Likely the first FA2/4 hybrid incoming - Page 3 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Irace86.2.0 · 11-05-2021, 04:44 PM

Quote:

Originally Posted by redlined600

I guess I'll be the first to ask, how much for the short-block?

https://parts.subaru.com/a/Subaru_20...11-001-02.html

Goingnowherefast · 11-05-2021, 05:29 PM

Quote:

Originally Posted by Irace86.2.0

https://parts.subaru.com/a/Subaru_20...11-001-02.html

That's actually really reasonable

alphasaur · 11-05-2021, 05:40 PM

Quote:

Originally Posted by Goingnowherefast

That's actually really reasonable

A bargain compared to alternatives.

ermax · 11-05-2021, 06:12 PM

So it’s basically the same price as the FA20 short block. I got FA20 short block through a friend at a dealer for around 1800. I suspect the FA24 could be had for similar discounts if you know the right person.

FrickingReallySlow · 11-05-2021, 06:53 PM

Curious about @Opie plan for the heads to get compression back to 12.5 The FA20 heads will actually introduce a quench/squish area when paired with bigger bore of FA24 (which I guess can be desirable for velocity and mixturing). Probably also need a head CC kit to get compressed volume even across all 4 heads if material is taken out.

alex87f · 11-05-2021, 07:25 PM

Quote:

Originally Posted by Goingnowherefast

That's actually really reasonable

Surprisingly so. Probably looking at three grand once you account for the ancillaries. Then what else do you need?

-Header, if you're still stock?
-Tune? Which might become available off-the-shelf in the not-too-distant future

If that works out, it might yield 250 OEM-like hp for the price of a decent supercharger. N/A, with a "new" engine, higher reliability and less weight.

Speaking of which, interested in seeing the weight penalty between FA24 & FA20 short blocks. Probably less than an FI kit anyway.

ermax · 11-05-2021, 07:45 PM

Quote:

Originally Posted by alex87f

Speaking of which, interested in seeing the weight penalty between FA24 & FA20 short blocks. Probably less than an FI kit anyway.

I doubt it’s much more. I guess the steel sleeves are larger but could that really add up that much?

Opie · 11-05-2021, 08:26 PM

Quote:

Originally Posted by BrahmaBull1990

This was my biggest concern. I have an Edelbrock and it is going to be tough if it doesn’t match up. I suppose I could sell my FA20 Edelbrock to finance the FA24 short block and machining, then add another PD SC down the road.

Decisions, decisions….
@Opie Are you considering the upgraded transmission, too?

Not until/unless the current one breaks

Ashikabi · 11-05-2021, 08:55 PM

Quote:

Originally Posted by alex87f

Surprisingly so. Probably looking at three grand once you account for the ancillaries. Then what else do you need?

-Header, if you're still stock?

-Tune? Which might become available off-the-shelf in the not-too-distant future

If that works out, it might yield 250 OEM-like hp for the price of a decent supercharger. N/A, with a "new" engine, higher reliability and less weight.

Speaking of which, interested in seeing the weight penalty between FA24 & FA20 short blocks. Probably less than an FI kit anyway.

I'm gonna assume the weight penalty is approximately one large dump after taco night.

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nikitopo · 11-06-2021, 04:40 AM

Is it not the FA24 short-block longer? Hope you don't have clearance issues.

Goingnowherefast · 11-06-2021, 10:01 AM

Quote:

Originally Posted by nikitopo

Is it not the FA24 short-block longer? Hope you don't have clearance issues.

No. It should be the exact same size externally.

Brz-123 · 11-06-2021, 10:15 AM

Quote:

Originally Posted by nikitopo

Is it not the FA24 short-block longer? Hope you don't have clearance issues.

It has the same casting and same stroke , no change. Only bored wider.

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Goingnowherefast · 11-06-2021, 10:18 AM

The question here is will it use the same CPS (crank position sensor). That's another critical sensor you'll need to determine engine position. If it is different, it may be possible to swap the gen 1 sensor in.

Ashikabi · 11-06-2021, 10:35 AM

Quote:

Originally Posted by Brz-123

It has the same casting and same stroke , no change. Only bored wider.

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Shouldn't the FA20 headers fit then?

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11-06-2021, 10:18 AM	#41
Goingnowherefast Senior Member Join Date: May 2019 Drives: AP2 S2000, 91 Miata 1.8L Rotrex 5MT Location: Detroit, MI Posts: 465 Thanks: 275 Thanked 299 Times in 187 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	The question here is will it use the same CPS (crank position sensor). That's another critical sensor you'll need to determine engine position. If it is different, it may be possible to swap the gen 1 sensor in. __________________ 2022 Hyundai Elantra N 6MT SCCA TT S3//Will be back in an 86 eventually

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11-05-2021, 06:12 PM	#32
ermax Senior Member Join Date: Sep 2017 Drives: 2022 BRZ Limited Silver Location: Jacksonville, FL Posts: 2,532 Thanks: 882 Thanked 2,045 Times in 1,188 Posts Mentioned: 68 Post(s) Tagged: 0 Thread(s)	So it’s basically the same price as the FA20 short block. I got FA20 short block through a friend at a dealer for around 1800. I suspect the FA24 could be had for similar discounts if you know the right person.

11-05-2021, 06:53 PM	#33
FrickingReallySlow Senior Member Join Date: Jun 2021 Drives: 2015 FR-S Location: San francisco Posts: 357 Thanks: 144 Thanked 154 Times in 101 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	Curious about @Opie plan for the heads to get compression back to 12.5 The FA20 heads will actually introduce a quench/squish area when paired with bigger bore of FA24 (which I guess can be desirable for velocity and mixturing). Probably also need a head CC kit to get compressed volume even across all 4 heads if material is taken out.

11-06-2021, 04:40 AM	#38
nikitopo Senior Member Join Date: Mar 2014 Drives: '15 BRZ RA Location: Greece Posts: 3,787 Thanks: 2,416 Thanked 1,944 Times in 1,261 Posts Mentioned: 29 Post(s) Tagged: 0 Thread(s)	Is it not the FA24 short-block longer? Hope you don't have clearance issues.

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