The piston height on my ROSS pistons are out to lunch! - Page 2

gto7419 · 06-19-2009, 12:26 AM

Quote:

Originally Posted by cribbie

Are there any other methods? if not does this mean it was not balanced?

I am really surprised nobody has made a comment on the picture with the turbo in it

twinscroll 40r?

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DSM_Outback · 06-19-2009, 12:30 AM

Quote:

Originally Posted by cribbie

Are there any other methods? if not does this mean it was not balanced?

Subarus are neutral balance. No external weight phasing/timing is required.
It means, if you run a piston set whose weight is different than the fuqued up Ross ones you have now, you'll still have a balanced assembly.

All_talk · 06-19-2009, 12:47 AM

Quote:

Originally Posted by cribbie

...
I am really surprised nobody has made a comment on the picture with the turbo in it

Hardly noticed it, maybe I’ve been jaded by too much engine porn… ya seen one big turbo, ya seen em all.

Gary

wrxsti.l · 06-19-2009, 12:51 AM

AFAIK you have Ross' EJ22T 2.4 "stroker" pistons for use with the 79mm EJ25x crank - as indicated by the 1.161' (29.489mm) compresion height. Ross' replacement EJ22T pistons have a compression height of 1.275' (32.385mm).

Also FYI, Ross' replacement EJ25x pistons have a compression height of 1.192" (30.276mm).

You really have only two options now:
1. send them back (but free replacement depends on who ordered them and what they ordered); or
2. As per maxwell's comment, use a suitable 79mm stroke crank and build a 2.4L stroker.

Leslie

3MI Racing · 06-19-2009, 09:10 AM

Quote:

Originally Posted by wrxsti.l

AFAIK you have Ross' EJ22T 2.4 "stroker" pistons for use with the 79mm EJ25x crank - as indicated by the 1.161' (29.489mm) compresion height. Ross' replacement EJ22T pistons have a compression height of 1.275' (32.385mm).

Leslie

You will note that 32.385mm - 29.489mm = 2.896mm Now that is actually a 79mm stroke (2mm) and 0.896mm left over that would be from a longer use rod or a rediculously crappy quench height.

madmax718 · 06-19-2009, 10:19 AM

no good comments here.. but those old pistons look completely horrid.

jamal · 06-20-2009, 05:02 AM

If it helps I can kick Ian in the ass for you tomorrow.

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06-19-2009, 12:51 AM	#29
wrxsti.l Scooby Specialist Member#: 156973 Join Date: Aug 2007 Chapter/Region: International Location: Adelaide, Australia Vehicle: 2002 ADM WRX STi STi Black/Blue	AFAIK you have Ross' EJ22T 2.4 "stroker" pistons for use with the 79mm EJ25x crank - as indicated by the 1.161' (29.489mm) compresion height. Ross' replacement EJ22T pistons have a compression height of 1.275' (32.385mm). Also FYI, Ross' replacement EJ25x pistons have a compression height of 1.192" (30.276mm). You really have only two options now: 1. send them back (but free replacement depends on who ordered them and what they ordered); or 2. As per maxwell's comment, use a suitable 79mm stroke crank and build a 2.4L stroker. Leslie

06-19-2009, 10:19 AM	#31
madmax718 Scooby Specialist Member#: 172501 Join Date: Feb 2008	no good comments here.. but those old pistons look completely horrid.

06-20-2009, 05:02 AM	#32
jamal Scooby Guru Member#: 71875 Join Date: Oct 2004 Location: Montana Vehicle: 98 2.5GT my wheels fit	If it helps I can kick Ian in the ass for you tomorrow.