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Old 03-24-2011, 10:19 PM   #51
spoolinred
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great job. about time someone done a write up like this....wish i had something like this to go by on my first build.
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Old 03-24-2011, 10:22 PM   #52
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damn some of you guys know a phenominal amount of stuff about these cars. Super impressive. Pretty good timing too as Im about to try to figure out what I want to/need to do with my S20 heads for my EJ22 build
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Old 03-24-2011, 10:30 PM   #53
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Quote:
Originally Posted by Homemade WRX View Post
See destroked EJ25

Also mean piston speed as you described is just tip of the iceberg for acceleration and speeds on the piston.
That's absolutely true - just offering it up as a possible addition, and something for people to consider before choosing an engine setup.
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Old 03-25-2011, 09:30 AM   #54
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I'll probably cover all the reciprocating dynamics. I've already started reworking the curves (since losing my jumpdrive) for instantaneous velocities, acceleration, displacement and piston loading. So I should have them up again in the coming week.
I plan to do two sets. One for EJ257 (as the standard in the US), EJ20 and then my +4mm long rod. The second will be an EJ257, EJ257 (+2mm rod) and 83mm stroker...the short rod ratio group.
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Old 04-11-2011, 01:09 AM   #55
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Here's one added to the group..


Here is a stock 2.5L EJ255/EJ257 B25 combustion chamber to a 97mm bore.
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Old 04-15-2011, 08:26 PM   #56
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once I get to a PC with photoshop, i'll edit the photos to show where to look for.
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Old 04-17-2011, 12:24 PM   #57
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What about a 2.1 build?
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Old 04-18-2011, 01:47 PM   #58
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^^^what about it?

Notice he posted the 2.35 stroker for EJ22 (for EJ20 as well)...you are essentially the same thing as the EJ22 but with the smaller bore and 2.12L instead.

Last edited by Homemade WRX; 04-18-2011 at 01:52 PM.
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Old 04-18-2011, 01:52 PM   #59
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This seems like the place to ask my question.



If you're using long rods in a EJ25 with a 79mm crank, do you change the location of the wristpin or ??

So the piston wont sit above the deck.
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Old 04-18-2011, 02:02 PM   #60
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Quote:
Originally Posted by FuJi K View Post
Here's one added to the group..


Here is a stock 2.5L EJ255/EJ257 B25 combustion chamber to a 97mm bore.

So what would it look like with the 99.5mm bore, or even 100mm bore. It seems it's pretty flush with the 97mm bore, so would you have a lip there like on a 2.5L block/2.0L head hyvrid, but just smaller?

I know it's a bad thing on the hybrids, and just assumed the 2.5 chamber to the 2.5 block would be flush like it looks on the 2.2 bore/2.5 chamber in that pic.

Thanks for all your hard work on this epic thread!
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Old 04-20-2011, 09:42 AM   #61
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Quote:
Originally Posted by morrocco88 View Post
So what would it look like with the 99.5mm bore, or even 100mm bore. It seems it's pretty flush with the 97mm bore, so would you have a lip there like on a 2.5L block/2.0L head hyvrid, but just smaller?

I know it's a bad thing on the hybrids, and just assumed the 2.5 chamber to the 2.5 block would be flush like it looks on the 2.2 bore/2.5 chamber in that pic.

Thanks for all your hard work on this epic thread!
The B25 heads are right at 99mm at the very corner on the edges of the chamber. It's 97mm where the side of the chambers actually go into the head. However Subaru rounded off the sides of the chamber so instead of a sharp corner edge, it's a rounded edge.

I'll get you that picture soon
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Old 04-20-2011, 10:41 AM   #62
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^^^yup, the put a radius all around the chamber. IIRC is about 98.5 or 99mm from the edge of the radii. so roughly a 1mm radius on the rounded edge.
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Old 04-20-2011, 12:16 PM   #63
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[quote=FuJi K;33426982]
How about a 65.8mm crank with +6mm rods on a 2.0L bore NA build with ported heads and long duration cams? Maybe 14,000rpms?
quote]


has this been attempted?


i wonder what it'd sound like
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Old 04-20-2011, 01:10 PM   #64
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It's been discussed before. Financially it's pointless

I had commented about it in a thread somewhere on here. I'd had a customer (from when I had a vendor account) in a spec 2.0L class asking me about it I began to show him all the parts that would need to be custom. It's not worth the mountains of cash, even in a spec class.
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Old 04-20-2011, 04:26 PM   #65
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Old 04-20-2011, 04:35 PM   #66
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Quote:
Originally Posted by Prevent View Post
This seems like the place to ask my question.



If you're using long rods in a EJ25 with a 79mm crank, do you change the location of the wristpin or ??

So the piston wont sit above the deck.

bizump
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Old 04-20-2011, 05:28 PM   #67
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yes, you would have to shorten the compression height
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Old 04-20-2011, 06:11 PM   #68
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Gotcha, what i was thinking but wanted to confirm.


i was thinking you move the wristpin or change the compression height.. (which are both the same thing lol)
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Old 05-09-2011, 12:03 PM   #69
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I'm going to get the STi head CC'd and also the modded EJ205 head CC'd (the one that I ported out to match the EJ257. I've heard from 56cc to 58cc on the EJ257 chambers so.... I just chose 57cc. .... lol we'll find out.

BRB!!!
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Old 05-10-2011, 01:08 AM   #70
FuJi K
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Okies.. the STi heads are 57cc.
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Old 05-21-2011, 11:46 PM   #71
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So is it going to be bad to match the 97mm bore with the b25 heads? Is it gonna be that bad that the head's end is just 1.5-2 mm bigger?
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Old 05-22-2011, 12:01 AM   #72
FuJi K
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^^^^
actually it'll work just fine.
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Old 05-22-2011, 12:15 AM   #73
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Awesome! XD thanks Fuji!
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Old 05-31-2011, 10:24 AM   #74
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a lot of build threads recently....
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Old 05-31-2011, 10:31 AM   #75
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^^^^^^^^^^^^^^^ as there will be alot of "whats this noise" "whats that noise" lol Nah hopefully not you guys seem to know whats up in here.
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