What limits an engine from safely spinning at higher RPM? - Page 4 - Subaru Impreza GC8 & RS Forum & Community: RS25.com

haz-e · 07-04-2010, 12:04 AM

New to Subaru motors but not motor building. How square are the 2.2-2.5 motors? Hondas rev by design. Short rods and great rod ratios.

Splinter · 07-04-2010, 12:35 AM

Oversquare

shack · 07-04-2010, 12:46 AM

Quote:

Originally Posted by haz-e

New to Subaru motors but not motor building. How square are the 2.2-2.5 motors? Hondas rev by design. Short rods and great rod ratios.

Oversquare, but it varies a bit because 2.2 - 2.5 covers a broad number of EJ engines, turbo and NA.

This thread is a little silly, if you want to grenade your motor at 10,000 RPM, you own the wrong vehicle. Buy an AE86 or better yet any modern Japanese motorcycle.

Flakter · 07-06-2010, 03:09 PM

Quote:

Originally Posted by Splinter

It's not possible. The rods cannot be removed without separating the block halves and the block halves can't be separated without removing it from the car.

By the time you've taken the heads off it's nothing to take the shortblock out anyway, I've done it by myself without a hoist before. Weighs about 90lbs

Good to know for the future.

jakeachy · 07-06-2010, 03:32 PM

If you want to rev, the 3.3 h6 is probably the way to go.
It enjoys making more power as the revs increase, even on stock cams.

But you'd be better off doing a turbo swap if you are asking how to spin an na ej to 8k+

Flakter · 07-07-2010, 10:23 AM

Building up an NA H6 would be amazing to do. But I feel like finding parts for it would be quite a PITA, mostly because its not nearly as common as a 2.5 or 2.0.

07-04-2010, 12:35 AM	#32 (permalink)
Splinter 2.0L Turbo Car: 98 Impreza 2.2RA Fav Mod: 17x10 wheels My: Subaru Parts for sale Join Date: Jul 2007 Location: Victoria, BC Trader Rating: (2) Posts: 1,969	Oversquare __________________ Doing his part to end the 'Polite Canadian' stereotype

07-06-2010, 03:32 PM	#35 (permalink)
jakeachy 2.2L Turbo Car: Trophies don't spend Fav Mod: CASH My: Subaru Parts for sale Join Date: Nov 2007 Location: WI Trader Rating: (12) Posts: 3,044	If you want to rev, the 3.3 h6 is probably the way to go. It enjoys making more power as the revs increase, even on stock cams. But you'd be better off doing a turbo swap if you are asking how to spin an na ej to 8k+ __________________ Oh no, I don't want to play you Floyd- you beat the champ in Shembugenwak County!

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07-04-2010, 12:04 AM	#31 (permalink)
haz-e 1.8L My: Subaru Parts for sale Join Date: Jun 2010 Trader Rating: (0) Posts: 6	New to Subaru motors but not motor building. How square are the 2.2-2.5 motors? Hondas rev by design. Short rods and great rod ratios.

07-07-2010, 10:23 AM	#36 (permalink)
Flakter 1.8L Car: 1999 Impreza 2.5RS Fav Mod: ACT Streetlite Flywheel My: Subaru Parts for sale Join Date: Feb 2008 Location: Utah Trader Rating: (0) Posts: 16	Building up an NA H6 would be amazing to do. But I feel like finding parts for it would be quite a PITA, mostly because its not nearly as common as a 2.5 or 2.0.

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