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Old 06-15-2003, 10:15 AM   #1
ravent
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Question Where are the 2.4l subarus

I am hearing that there are several 2.4l subaru motors around that WRX owners are replacing their 2.0l motors with...is there any truth to this? Are they "de-stroked" 2.5l (why) or enlarged 2.0l (stroke/pistons) or what??? I am sure that Cobb is not where they are coming from...maybe from the "sand-rail" market?
thanks
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Old 06-15-2003, 11:36 AM   #2
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Axis Racing.
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Old 06-15-2003, 02:06 PM   #3
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the 2.4 l is a 2.2 block stroked...
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Old 06-15-2003, 02:19 PM   #4
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Quote:
Originally posted by HOK
the 2.4 l is a 2.2 block stroked...
wrong destroked, sleeved and smaller bore EJ25

Have met ron in person, have had one of these in my hands and they are beautiful.

Any 2.4 that spun balanced to 10k RPM and made to handle 800horse is all good in my book.

Ron is the
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Old 06-15-2003, 03:01 PM   #5
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Well, actually, there are two ways to stroke an EJ motor to 2.4 L and both you guys are right.
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Old 06-15-2003, 03:12 PM   #6
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yup i was not referring to the Axis blocks... don't know much about them.. most of the 2.4's i would assume are the blocks with the 2.5 cranks in them...

What does Ron do with the deck? I think I speed is selling some crazy motors too... an exciting time for subies now... not like when i blew me engine 2 years ago..
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Old 06-15-2003, 05:36 PM   #7
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You can check cobbtuning as well. Pretty sure that I saw a 2.4l (maybe it was a 2.5l) swap for the WRX.
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Old 06-15-2003, 05:54 PM   #8
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Default Re: Where are the 2.4l subarus

Quote:
Originally posted by ravent
I am hearing that there are several 2.4l subaru motors around that WRX owners are replacing their 2.0l motors with...is there any truth to this? Are they "de-stroked" 2.5l (why) or enlarged 2.0l (stroke/pistons) or what??? I am sure that Cobb is not where they are coming from...maybe from the "sand-rail" market?
thanks
As to your question of why you would de-stroke a 2.5, it would allow you to lower the compression ratio to be able to safely run higher boost pressures.
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Old 06-15-2003, 06:53 PM   #9
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Default Re: Re: Where are the 2.4l subarus

Quote:
Originally posted by US2JDM
As to your question of why you would de-stroke a 2.5, it would allow you to lower the compression ratio to be able to safely run higher boost pressures.
No, not quite. Lowering the compression just has to do with changing the pistons. While it's true the beyond a certain point you can't lower the compression with pistons alone due to the distance between the rod and underside of the piston face, you could still do it without stroking, just pistons and shorter rods.

You destroke a motor to change the rod to stroke ratio, which is really what determines the rate of piston speed change during the stroke. With a shorter rod, the rate of change is higher then with a longer rod. While it still goes through xxx distance at xxx rpm, the angle at which the rod is pulled by the crank changes and the actual acceleration of the piston is changed as well.

Not only does destroking the motor help to decrease piston speed, but if the deck is the same height (which it is, after all you can't change the deck height on a Subaru without making custom manifolds, etc) then you will have a longer rod.
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Old 06-16-2003, 02:53 PM   #10
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Axis 2.4 sleeved block

Cobb 2.5L semi-closed deck block


Same premise, strengthen the block to handle increased pressure. Cobb reinforces the open deck area while Axis uses beefy sleeves (which I have seen in person and HOLY CRAP does this look like a stout block!!!) at the expense of 100cc.
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Old 06-16-2003, 04:58 PM   #11
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holy... those sleeves look almost as good as that block posted in the RS forum... nice..
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Old 06-16-2003, 05:06 PM   #12
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I got to see the Axis bits at the Subaru Day at Motorsports Ranch (TXIC event) and I was floored at the quality of construction of Axis' components. There's a reason they're running so quick in the 1/4 mi
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Old 06-16-2003, 06:11 PM   #13
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I've never actually heard of these hitting the strip. The only one that had numbers was RobPA's and he hit around 300whp with a conservative tune. Do you have a link for some documented numbers?

-Jon
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Old 06-16-2003, 06:23 PM   #14
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Offhand, no... but I've seen them referenced a few times in PPB.
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Old 06-17-2003, 03:50 AM   #15
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Quote:
Originally posted by stimpy
I've never actually heard of these hitting the strip. The only one that had numbers was RobPA's and he hit around 300whp with a conservative tune. Do you have a link for some documented numbers?

-Jon
he went 11.8 on the block but he blew the motor

i guess dynoing an engine with 200 miles on it isn't a good idea afterall
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Old 06-17-2003, 04:04 AM   #16
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sheesh... talk about cash.. is this on a WRX
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Old 06-17-2003, 05:29 AM   #17
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Quote:
Originally posted by HOK
sheesh... talk about cash.. is this on a WRX
was in a WRX yes

i have contemplated picking up ron's block but for what i am doing i am going to pick up and STi-RA Spec C bottom end and use the RS heads with some cams and a lil custom port work

jeremy
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Old 06-17-2003, 10:36 AM   #18
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Quote:
Originally posted by HndaTch627
he went 11.8 on the block but he blew the motor
So that motor has blown twice now??? I didn't realize RobPA blew the motor shortly after he got it installed.

The person that bought the car is in Utah and it currently has 0 compression in #4.

-Jon
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Old 06-17-2003, 01:25 PM   #19
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Quote:
Originally posted by stimpy


So that motor has blown twice now??? I didn't realize RobPA blew the motor shortly after he got it installed.

The person that bought the car is in Utah and it currently has 0 compression in #4.

-Jon
from what i was told it had about 60 psi in cylinder immediatly after bieng installed and it's odd that it occured so soon with an improper break in procedure.

jeremy
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Old 06-21-2003, 10:29 PM   #20
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The engine was blown by the drivers driving the car to utah, they put in 91 octane gas on a car that was tuned for 94 and c-16. The car was running strong when it left my house and was fine until they got to utah when #4 took a ****. Blowing an engine by putting 91 octane in it is a lot differant then non proper breakin/me blowing it.



Rob
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Old 06-23-2003, 01:32 PM   #21
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Not to mention they beat the hell out of it on the way over. The story I heard was actually 89 octane, not 91. But in any case, I think there was more than just bad gas.

-Jon
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Old 11-29-2003, 05:04 AM   #22
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let me revive this one and set everyone straight. the motor did not blow due to any low octane fuel (which was the initial assumption). It lost no. 4 because the F_CK heads at ILP performance used head gaskets with a .020 crushed thickness, and the application called for .068 thick gastket. well that was actually just secondary to the main problem. the main problem was that ILP ground the valve seats way too far in the porting job, and didnt properly ground the butt part of the valve. the car made low compression when it started up in the beginning, but, made zero when it got back to Ut, because of all this other **** combined with Fed up valves from over corrections, by the UTEC thinking it saw knock. No one bashed on the car on the way back and it was pushing 16 lbs. no more! THEY ACTUALLY ONLY PULLED THAT CAR HAR LIKE 4 TIMES AND EVERY TIME IT WAS ON THE FREEWAY AND NOT FOR MORE THAN A COUPLE OF GEARS. they never put bad fuel in the car. just 91 octane, and it was not on a tune for 94 and c16, those are all huge rumors. anyways thats the situation.
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Old 11-29-2003, 05:06 AM   #23
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oh and it is not destroked at all. its got a stock 2.5 crank, its just got thicker sleeves, so its a 2.4
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Old 11-29-2003, 02:42 PM   #24
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how much does this 2.4 engine run, will it replace an ej25 without a problem, how much boost can it run?
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Old 11-29-2003, 09:45 PM   #25
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i-speed makes several different blocks...2.4, 2.6 and 2.8...
http://www.i-speed.us/products/
Yeah the 2.4 could of course also be a stroked 2.4L
http://www.pms.net.au/enginekits.htm
Take it easy, Micah
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