EJ25 upgrade on SxS

[CLS447]

Thanks Stan. IVO forgot to send the instructions but they are on their way now. He also told me about the tape to check for blade movement.

I wanted to get drilled head bolts for safety wire but IVO said no !

Did your 2.5 have the oil cooler under the oil filter or not?

I will post some closeup photos of this.

Oh yeah....3 days in Tampa & then onto the Carnival Legend for SUPER BOWL Sunday. Then Grand Cayman, Cozumel, Belize , & a Honduran Island. I never did a cruise before, should be FUN !!!

[CLS447]

Took some pics of the oil filter assembly & me with my brand new cruise haircut.

[StanFoster]

Chris- I have always loved your posts. You are always upbeat and you are always doing something extra nice! Thanks for adding more smiles than frowns. Kick back and enjoy that warm cruise! Then we all get to keep following your 2.5 project when you get back. Stan

[barnstorm2]

looking good!!

[CLS447]

Hey Thanks guys, I'm looking at the pic of the oil cooler. It looks like it is connected to the thermostat housing.

Boy do I have alot to learn about the 2.5.

Any & all informatiopn about this engine is greatly appreciated !

[rfi]

Some of the EJ22 and EJ25 engines were equipped with this oil cooler. It uses engine coolant to transfer heat from the oil.

I always removed them because my engine mount design didn't provide room for the cooler.

[CLS447]

Don, Thanks for the input. I'm sorry ,but I am yet to remove the harness ,that you did for me, out of the wrapping !

I will be looking at the drawings for your mount in the very near future.

So your mount will accept the oil filter but not the cooler ?

Do you remember which O2 sub harness I need, front or rear ?

I spoke with Subaru parts yesterday, the bolts & other thing that I need are relatively inexpensive. The rear sub harness is $80.

What do you suggest I do for an alternator & mount ?

What do you like for pulleys ?

Thanks

I think that these question & answer sessions are good for everyone.

[rfi]

Hi Chris,
Yes, the filter plus the oil cooler extends too far down so that the filter makes contact with the top of the engine mount.

You need the sub harness for the front O2 sensor. It is the one that helps determine the fuel/air mixture. The rear sensor is only there to determine the condition of the catalytic converter which you don't need.

I have always used a small, 55 Amp Nippondenzo alternator from the Geo Metro. It is more than adequate in power output and only weighs around 5.5 pounds.

If you are talking about pulleys for the alternator, the stock pulley is okay although you can slow down the alternator by putting a larger pulley on it or replacing the five inch diameter crankshaft pulley with a lighter weight and smaller diameter aluminum version. You can get a 4 inch aluminum pulley for the crankshaft from Tech Welding in Paducah, KY (www.techwelding.com).

[automan1223]

The crankshaft pulley does double duty as a harmonic balancer. I would advise against trading it for a shiny smaller racing one.

Harmonic balancer absorbs high frequency vibrations that eat up bearings, cause crankshafts to break, etc. etc.

J

[Brent_Brown]

Chis what gear size do you have in your autoflight box? 2.2 to 1?

[rfi]

Jonathan,
I thought the same thing and discouraged people from replacing it with a light weight pulley until I learned different.
According to a Subaru engineer the crankshaft pulley is not a harmonic balancer for the engine even though it is built like one. He said that the crank pulley is a dampener to reduce shock loads from the air conditioning compressor turning on. He said that the engine is well balanced internally and does not need a harmonic balanceer.

There are several aftermarket companies that sell light weight, smaller diameter pulleys for racing applications where fractional hp increases can mean the difference beteen winning or losing a race.

[automan1223]

Learning way back in my college engine class, every internal combustion engine has a problem with harmonics so as long as the a/f charge goes off and turns a crank. The whole assy will ring like a bell, the crank being the bell part, and the burning of the fuel the rod that rings it. It is possible that the assy is tuned to a freq so high or low that it is not a problem in pass car aplications, but I would like to see some kind of real world test before i replaced an assy that runs at constant high rpms that it would not do damage to the crank, rods, bearings etc.

One of the same reasons why subaru re-engineered the 2.5 crank in the phase II buildups was the se-sawing of the crank in the block beating up the thrust bearing, I am guessing the "springy" ness of the crank in the block played a part there too.

Harmonic balancers are actually a misnomer, they are actually harmonic absorbers.

J

[rv6ejguy]

SAE paper 890471 by the designers of the EJ series engines states that the balancer is necessary to reduce bending and torsional loads on the crankshaft.

Most modern engines have absorbers and you are removing these to fit lightweight pulleys at your own risk. Unfortunately a CNC shop which turns out shiny, lightweight pulleys for racing or looks probably does no analysis or validation with these products like the OEM does.

I can state from experience that on some racing engines operated at high rpm without the absorber in place, crankshaft failure was a quick certainty. While it may be fine for a while at reduced rpms, why play with fire?

[CLS447]

Just thought I would give my thread a bump......not much going on here under Air Command.

Don Parham.....I am going nuts looking for the engine mount plans you sent me. I will find them eventually. I would be glad to pay you for another set.

I am still not sure how I am going to mount the 2.5 yet.

I have to retrieve the machine from the airport & disassemble & store parts.

I will also have to give my 447 it's annual condition inspection, fuel her up & take her out for a rip.....as soon as we get some decent weather.

I got that alternator with the large pulley from Stan, now I need a mount. When I get ahold of Groen Bros. I will determine if their price is reasonable or borrow a friends mount & have it duplicated at the machine shop.

I removed the oil cooler & have ordered some parts for the 2.5 from the soob dealer.

While at the dealer I got an eyeful under the hood of the WRX & the STI. 300hp & 40K for the STI...also a nice red wrinkle coat on the intake manifold.

The WRX sports a smaller intercooler & a plastic manifold, I wonder if that intake would fit my 99 2.5?

Another interesting note....both are still using the DOHC whereas I believe all others use the SOHC !

There's the update !

[rfi]

Chris,
Email me your mailing address and I will send you another set of engine mount drawings.

rfi@oklatel.net.