Subaru 2.2 & Subaru 2.5 question

Chuck Roberg

Gyro's are more fun
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Oct 30, 2003
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Naperville, IL
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I am considering replacing my Subaru 2.2 engine with the Subaru 2.5 engine.

Are the engine mounting points the same on both of them. Or will I have to make new engine mounts.

Also will the reduction drive on the 2.2 fit the 2.5
 

Eric S

Junior Member
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Dec 22, 2012
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Kingsland, TX
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Sport Copter Vortex & AAI (Sparrowhawk) RAF
I am considering replacing my Subaru 2.2 engine with the Subaru 2.5 engine.

Are the engine mounting points the same on both of them. Or will I have to make new engine mounts.

Also will the reduction drive on the 2.2 fit the 2.5

Yes and yes.

Chuck,

I am in the beginning stages of doing the exact same thing with a used gyro I purchased. I spoke with an expert Subaru repair shop owner yesterday who told me the engines are the same externally for mounting points and gearbox/reduction drives.

IF ANYONE HAS A RUNNING 2.5 SUBARU THEY WOULD LIKE TO SELL I'M VERY MOTIVATED.

Also, I have a non-running 2.5 that came with my gyro. If anyone has a recommendation for a shop or "a guy" that does quality rebuilds I'd be grateful for a recommendation.

Eric
 

TJPUMPHREY

TJGYRO
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Location
Erlanger, Kentucky
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C-172,C-152-C150, Twinstar gyro
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Is there any good information on building the EJ 2.2 AND 2.5 engines for aircraft use. Also, looking for any information on Subaru engines in
general.
 

Agwotu

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Sep 7, 2019
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UGANDA
I am considering replacing my Subaru 2.2 engine with the Subaru 2.5 engine.

Are the engine mounting points the same on both of them. Or will I have to make new engine mounts.

Also will the reduction drive on the 2.2 fit the 2.5
yes , the ej 25 bolts well,. but the cylinder heads of 2.5l ej are very very heavy compared to 2.2l ej engine, very tricky that............is your 2.5 cylinder heads i dentical with the 2.2 ?
 

Capt'n Gator

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Yes and yes.

Chuck,

I am in the beginning stages of doing the exact same thing with a used gyro I purchased. I spoke with an expert Subaru repair shop owner yesterday who told me the engines are the same externally for mounting points and gearbox/reduction drives.

IF ANYONE HAS A RUNNING 2.5 SUBARU THEY WOULD LIKE TO SELL I'M VERY MOTIVATED.

Also, I have a non-running 2.5 that came with my gyro. If anyone has a recommendation for a shop or "a guy" that does quality rebuilds I'd be grateful for a recommendation.

Eric
Jonathan Weis in Oriental, NC is a wizard with Subaru and he owns his own Auto shop. He is on the PRA Facebook page, he is also a gyro pilot.
 

Chuck Roberg

Gyro's are more fun
Joined
Oct 30, 2003
Messages
3,542
Location
Naperville, IL
Aircraft
SnoBird Tandem Gyro, Robinson R-22, Assorted Fixed Wing
Total Flight Time
2200
Thanks for all the replies. I decided to keep the Subaru EJ 2.2 and either have it rebuilt or get a rebuilt crate EJ 2.2 to replace it.
 

TJPUMPHREY

TJGYRO
Joined
Dec 5, 2012
Messages
182
Location
Erlanger, Kentucky
Aircraft
C-172,C-152-C150, Twinstar gyro
Total Flight Time
490
Yes and yes.

Chuck,

I am in the beginning stages of doing the exact same thing with a used gyro I purchased. I spoke with an expert Subaru repair shop owner yesterday who told me the engines are the same externally for mounting points and gearbox/reduction drives.

IF ANYONE HAS A RUNNING 2.5 SUBARU THEY WOULD LIKE TO SELL I'M VERY MOTIVATED.

Also, I have a non-running 2.5 that came with my gyro. If anyone has a recommendation for a shop or "a guy" that does quality rebuilds I'd be grateful for a recommendation.

Eric
Is there any good information on building the EJ 2.2 AND 2.5 engines for aircraft use. Also, looking for any information on Subaru engines in
general.
 

Chuck Roberg

Gyro's are more fun
Joined
Oct 30, 2003
Messages
3,542
Location
Naperville, IL
Aircraft
SnoBird Tandem Gyro, Robinson R-22, Assorted Fixed Wing
Total Flight Time
2200
Is there any good information on building the EJ 2.2 AND 2.5 engines for aircraft use. Also, looking for any information on Subaru engines in
general.
I'm in the same situation as you. Trying to find how to convert the wiring harness for the ECU.

I spoke with Don Parham who used to convert Subaru engines for aircraft use. He does recommend the 2.5 over the 2.2.

The problem with the 2.5 is redoing the wiring harness to work as an aircraft engine. Don said after 2005 the wiring harness was changed for the 2.5 Making it extremely hard to convert the harness. Don said he converted 2-2005 harnesses and said he will not do another one.

For the 2.5 you want a wiring harness 2005 or earlier. For the 2.2 there were 2 different harnesses. There were also different ECUs for a manual transmission and automatic transmission.

After speaking with Don I will probably stick with a crate long block 2.2 to replace my current 2.2 rather than having it rebuilt. I will have the cam grind done which will give me the same HP as a 2.5. Since I don't know how to do the wiring harness. I will stick with the carburetor and distributor.

I do not think a 2.5 can use a carburetor and distributor.

For those who know Don. He has been retired for over 10 years and no longer does Subaru conversions. He is dealing with several health issues but he is still hanging in there at 83 years young.
 

Eric S

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Joined
Dec 22, 2012
Messages
168
Location
Kingsland, TX
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Sport Copter Vortex & AAI (Sparrowhawk) RAF
The problem with the 2.5 is redoing the wiring harness to work as an aircraft engine.
Chuck,

The SDS fuel injection/ECU is built for aviation use. I used the SDS system on my 2.5 with 2.2 heads. Reasonable price, relatively easy install, excellent support and it gets rid of the oxygen sensor so I can run avgas when necessary. You don't have to be a tuning expert to use it. I highly recommend it.

Eric
 

Chuck Roberg

Gyro's are more fun
Joined
Oct 30, 2003
Messages
3,542
Location
Naperville, IL
Aircraft
SnoBird Tandem Gyro, Robinson R-22, Assorted Fixed Wing
Total Flight Time
2200
Unfortunately that is a more than I'm willing to pay. For now since I have the Carburetor, Distributor and ignition coil from the current engine. I will stick with them for now. But I did bookmark the link incase I want to upgrade in the future.
 
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