I want to build a 2.x engine - Page 3

spoolinred · 03-24-2011, 10:19 PM

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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biodude · 03-24-2011, 10:22 PM

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

stoke · 03-24-2011, 10:30 PM

Quote:

Originally Posted by Homemade WRX

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.

Homemade WRX · 03-25-2011, 09:30 AM

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.

FuJi K · 04-11-2011, 01:09 AM

Here's one added to the group..

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

FuJi K · 04-15-2011, 08:26 PM

once I get to a PC with photoshop, i'll edit the photos to show where to look for.

dark_stalker · 04-17-2011, 12:24 PM

What about a 2.1 build?

Homemade WRX · 04-18-2011, 01:47 PM

^^^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.

Prevent · 04-18-2011, 01:52 PM

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.

morrocco88 · 04-18-2011, 02:02 PM

Quote:

Originally Posted by FuJi K

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!

FuJi K · 04-20-2011, 09:42 AM

Quote:

Originally Posted by morrocco88

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

Homemade WRX · 04-20-2011, 10:41 AM

^^^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.

smokey07 · 04-20-2011, 12:16 PM

[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

Homemade WRX · 04-20-2011, 01:10 PM

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.

smokey07 · 04-20-2011, 04:26 PM

Prevent · 04-20-2011, 04:35 PM

Quote:

Originally Posted by Prevent

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

Homemade WRX · 04-20-2011, 05:28 PM

yes, you would have to shorten the compression height

Prevent · 04-20-2011, 06:11 PM

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)

FuJi K · 05-09-2011, 12:03 PM

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!!!

FuJi K · 05-10-2011, 01:08 AM

Okies.. the STi heads are 57cc.

driftingrotary · 05-21-2011, 11:46 PM

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?

FuJi K · 05-22-2011, 12:01 AM

^^^^
actually it'll work just fine.

driftingrotary · 05-22-2011, 12:15 AM

Awesome! XD thanks Fuji!

FuJi K · 05-31-2011, 10:24 AM

a lot of build threads recently....

Paidfor · 05-31-2011, 10:31 AM

^^^^^^^^^^^^^^^ 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.

04-18-2011, 01:47 PM	#58
Homemade WRX Scooby Guru Member#: 33782 Join Date: Mar 2003 Chapter/Region: MAIC Location: Milton Keynes, UK Vehicle: 96 3MI Racing search FIRST, then PM!!!	^^^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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03-24-2011, 10:19 PM	#51
spoolinred Scooby Specialist Member#: 117017 Join Date: Jun 2006 Location: somewhere in the 10's.... Vehicle: 03 2.0fpred wrx!! blue	great job. about time someone done a write up like this....wish i had something like this to go by on my first build. * Registered users of the site do not see these ads.

03-24-2011, 10:22 PM	#52
biodude Scooby Specialist Member#: 271720 Join Date: Jan 2011 Chapter/Region: Tri-State Location: NEPA	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

03-25-2011, 09:30 AM	#54
Homemade WRX Scooby Guru Member#: 33782 Join Date: Mar 2003 Chapter/Region: MAIC Location: Milton Keynes, UK Vehicle: 96 3MI Racing search FIRST, then PM!!!	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.

04-11-2011, 01:09 AM	#55
FuJi K Scooby Guru Member#: 3687 Join Date: Jan 2001 Chapter/Region: MWSOC Location: St. Paul, MN Vehicle: MY99 GF4 JDM 6spd NF Performance	Here's one added to the group.. Here is a stock 2.5L EJ255/EJ257 B25 combustion chamber to a 97mm bore.

04-15-2011, 08:26 PM	#56
FuJi K Scooby Guru Member#: 3687 Join Date: Jan 2001 Chapter/Region: MWSOC Location: St. Paul, MN Vehicle: MY99 GF4 JDM 6spd NF Performance	once I get to a PC with photoshop, i'll edit the photos to show where to look for.

04-17-2011, 12:24 PM	#57
dark_stalker Scooby Newbie Member#: 278847 Join Date: Apr 2011 Chapter/Region: MWSOC Location: shoreview,mn Vehicle: 2002 wrx wagon PSM	What about a 2.1 build?

04-18-2011, 01:52 PM	#59
Prevent * Banned * Member#: 149114 Join Date: May 2007 Location: I'm too mainstream	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.

04-20-2011, 10:41 AM	#62
Homemade WRX Scooby Guru Member#: 33782 Join Date: Mar 2003 Chapter/Region: MAIC Location: Milton Keynes, UK Vehicle: 96 3MI Racing search FIRST, then PM!!!	^^^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.

04-20-2011, 12:16 PM	#63
smokey07 Scooby Specialist Member#: 151683 Join Date: Jun 2007 Chapter/Region: MAIC	[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

04-20-2011, 01:10 PM	#64
Homemade WRX Scooby Guru Member#: 33782 Join Date: Mar 2003 Chapter/Region: MAIC Location: Milton Keynes, UK Vehicle: 96 3MI Racing search FIRST, then PM!!!	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.

04-20-2011, 04:26 PM	#65
smokey07 Scooby Specialist Member#: 151683 Join Date: Jun 2007 Chapter/Region: MAIC

04-20-2011, 05:28 PM	#67
Homemade WRX Scooby Guru Member#: 33782 Join Date: Mar 2003 Chapter/Region: MAIC Location: Milton Keynes, UK Vehicle: 96 3MI Racing search FIRST, then PM!!!	yes, you would have to shorten the compression height

04-20-2011, 06:11 PM	#68
Prevent * Banned * Member#: 149114 Join Date: May 2007 Location: I'm too mainstream	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)

05-09-2011, 12:03 PM	#69
FuJi K Scooby Guru Member#: 3687 Join Date: Jan 2001 Chapter/Region: MWSOC Location: St. Paul, MN Vehicle: MY99 GF4 JDM 6spd NF Performance	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!!!

05-10-2011, 01:08 AM	#70
FuJi K Scooby Guru Member#: 3687 Join Date: Jan 2001 Chapter/Region: MWSOC Location: St. Paul, MN Vehicle: MY99 GF4 JDM 6spd NF Performance	Okies.. the STi heads are 57cc.

05-21-2011, 11:46 PM	#71
driftingrotary Scooby Specialist Member#: 234715 Join Date: Jan 2010 Chapter/Region: RMIC Location: cheyenne, wyoming Vehicle: 2003 wrx charcoal	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?

05-22-2011, 12:01 AM	#72
FuJi K Scooby Guru Member#: 3687 Join Date: Jan 2001 Chapter/Region: MWSOC Location: St. Paul, MN Vehicle: MY99 GF4 JDM 6spd NF Performance	^^^^ actually it'll work just fine.

05-22-2011, 12:15 AM	#73
driftingrotary Scooby Specialist Member#: 234715 Join Date: Jan 2010 Chapter/Region: RMIC Location: cheyenne, wyoming Vehicle: 2003 wrx charcoal	Awesome! XD thanks Fuji!

05-31-2011, 10:24 AM	#74
FuJi K Scooby Guru Member#: 3687 Join Date: Jan 2001 Chapter/Region: MWSOC Location: St. Paul, MN Vehicle: MY99 GF4 JDM 6spd NF Performance	a lot of build threads recently....

05-31-2011, 10:31 AM	#75
Paidfor Scooby Specialist Member#: 267815 Join Date: Dec 2010 Chapter/Region: South East Location: LSx allll done..need headers Vehicle: Be in awe dont hate .)	^^^^^^^^^^^^^^^ 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.