05-27-2021, 09:40 PM | #57 |
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I didn't see it discussed earlier but you can just make your own FA24 by either using darton sleeves or using an FB25 block with FA20 heads and crank and con rods. I mean aure on the FB25 block you gotta clearence out for the starter. But other than that its not much trouble.with the fb25 you have to use fb25 pistons or just order custom pistons. The factory fb25 is 10.5:1 so great for boost, but higher comp NA pistons arent hard to obtain
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05-27-2021, 10:14 PM | #58 | |
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Quote:
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05-27-2021, 11:21 PM | #59 |
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05-28-2021, 02:17 AM | #60 | |
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FA20 heads on an FB25 block will raise the compression a little bit. Thats why i said 10.5:1 |
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05-28-2021, 02:19 AM | #61 |
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05-28-2021, 03:27 AM | #62 | |
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Quote:
https://dsportmag.com/the-tech/educa...s-of-the-fa20/
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05-28-2021, 12:25 PM | #63 |
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06-03-2021, 10:11 PM | #64 |
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I don't know where I read, but I did read elsewhere that it was supposed to have 13.5 or 14:1 compression ratio. Or what I have read was wrong. It may have been a prior to the anouncement
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06-03-2021, 10:18 PM | #65 | |
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Direct injection system is built into the heads not the blocks. If you swap the FA20 heads on the FB25 block it will be capable. THE only issue with using a FB25 block in the RWD configuration is the starter clearance. You either need to mill/machine/grind out a clearance for the starter gear. I know someone who already did this build using WRX heads on his Impreza |
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06-04-2021, 11:29 AM | #66 |
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The FB25 has a worse rod to stroke ratio(the FA20's is already not great), thinner rods, and thinner rod bearings then an FA20. Pass.
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06-04-2021, 12:49 PM | #67 |
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The new gens for sure have the bump in compression, like you mentioned 13:5.1
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06-04-2021, 01:30 PM | #68 |
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This is on Toyota’s website:
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06-04-2021, 02:53 PM | #69 |
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Ok never mind? For months they advertised 13:5.1?
I really want to know now lol.
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06-10-2021, 02:14 PM | #70 |
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I believe this was a mistake when the BRZ launched or a simple mistake made by someone that ended up widespread all over. Toyota claims it to be 12.5:1 and I believe there was a collaboration of both not too long ago also mentioning 12.5:1 - which I would think is the correct CR. It would also make more sense for them to stick to 12.5:1 rather than complicating things more with the engine.
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