Sti internals
Angry Dan
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Posts: 7,183
From: www.turboculture.com
Car Info: 05 Evo VIII
Re: EJ25 durability
Originally posted by MZM
Also, I find it interesting that the boxer engine design is inherently strong. This engine design is found in Porsches, aircraft engines and Subarus. A good choise for a starting point
Also, I find it interesting that the boxer engine design is inherently strong. This engine design is found in Porsches, aircraft engines and Subarus. A good choise for a starting point
Angry Dan
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Joined: Nov 2002
Posts: 7,183
From: www.turboculture.com
Car Info: 05 Evo VIII
Last edited by Mach5WRX; May 20, 2003 at 03:04 PM.
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Re: EJ25 durability
Originally posted by MZM
I know in the sandrail industry Subaru EJ 25 engines are very popular, durable, and routinely put out 400hp+. This is the old non-turbo engine modified for turbocharging. The parts used are not even as good as the new STi EJ25 engine internals.
Also, I find it interesting that the boxer engine design is inherently strong. This engine design is found in Porsches, aircraft engines and Subarus. A good choise for a starting point.
Mike McBride
I know in the sandrail industry Subaru EJ 25 engines are very popular, durable, and routinely put out 400hp+. This is the old non-turbo engine modified for turbocharging. The parts used are not even as good as the new STi EJ25 engine internals.
Also, I find it interesting that the boxer engine design is inherently strong. This engine design is found in Porsches, aircraft engines and Subarus. A good choise for a starting point.
Mike McBride
And, lighter almost always equals better to me.
Now is Subaru can make the STi weigh 2200 lbs, that would be awesome
Angry Dan
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Joined: Nov 2002
Posts: 7,183
From: www.turboculture.com
Car Info: 05 Evo VIII
Registered User
Joined: Dec 2002
Posts: 70
Boxer
I don't know about the comparative weight of any particular I4 design as compared to the H4 arrangement. But Subaru engines are known for being lightweight. That is one reason the aircraft people use them. With a little leverage, you can pick up a short block by hand.
A short and very low profile is another advantage to the H4 design. This allows more flexable vehicle design, either land or air.
The opposed piston design is by nature more balanced than inline or v designs. This allows very smooth operation and long life. The short crankshaft for example has five main bearings. Same as a Chevy V8 crank at twice the length.
Disadvantages include costing more to manufactor and width of the assembled engine.
These are opinions, I am not an engineer.
Mike McBride
A short and very low profile is another advantage to the H4 design. This allows more flexable vehicle design, either land or air.
The opposed piston design is by nature more balanced than inline or v designs. This allows very smooth operation and long life. The short crankshaft for example has five main bearings. Same as a Chevy V8 crank at twice the length.
Disadvantages include costing more to manufactor and width of the assembled engine.
These are opinions, I am not an engineer.
Mike McBride
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Joined: Apr 2003
Posts: 1,013
From: california, LOS ANGELES
Car Info: dream car Subaru STi
yup i agree. that is why the STi is better than the EVO performance wise. the subaru boxer motor is superior the the EVO's inline4. people need to know that is why Subaru owns! woooooooooo hoooooooooooooooo
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Originally posted by downshift
yup i agree. that is why the STi is better than the EVO performance wise. the subaru boxer motor is superior the the EVO's inline4. people need to know that is why Subaru owns! woooooooooo hoooooooooooooooo
yup i agree. that is why the STi is better than the EVO performance wise. the subaru boxer motor is superior the the EVO's inline4. people need to know that is why Subaru owns! woooooooooo hoooooooooooooooo
Registered User
Joined: May 2003
Posts: 258
From: leggtnut on legacygt.com
Car Info: 2006 BSP LGT / 2004 JBP FXT
boxer engine adviantages
The main advantages that I have found for the H4 and H6 designs from both Subaru and Porsche are the following:
1. smaller and lighter design
2. lower center of ballance
3. stiff and has a shorter crank
4. longer life
5. takes a beating
etc...
one of the unintended advantages is being able to mod the hell out of it and the moter will take it.
These are the reasons that I would take a Subaru over a Mutisu anyday.
just my .2c worth.
Ben
1. smaller and lighter design
2. lower center of ballance
3. stiff and has a shorter crank
4. longer life
5. takes a beating
etc...
one of the unintended advantages is being able to mod the hell out of it and the moter will take it.
These are the reasons that I would take a Subaru over a Mutisu anyday.
just my .2c worth.
Ben
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Joined: Apr 2003
Posts: 1,013
From: california, LOS ANGELES
Car Info: dream car Subaru STi
the subaru's die cast aluminum alloy block and aluminum alloy cylinder heads are made with metal stronger than steel and lighter, this kind of aluminum alloy is used for space craft. the iron cast block is just as strong and can take a beating also etc.. but the only thing is that it weighs a lot more. oh yes subaru is so great i just love it to death.
its not the number of cylinders in a car that determines greatness of the car. etc... the WRX n STi are representing the 4cylinder engines. what makes a car FAST is between the balance of torque and horsepower, the STi has got 300 HP at 6000rpm and 300 lb/ft Torque at 4000, now that is so well balanced such great power just a couple thousands rpms away.. this car is amazing.. it will jet off the line and fly on the run. all the way this car is so damn powerful the torque and hp great and the power is pure consistency. subaru has definitely created a domestic killer.
its not the number of cylinders in a car that determines greatness of the car. etc... the WRX n STi are representing the 4cylinder engines. what makes a car FAST is between the balance of torque and horsepower, the STi has got 300 HP at 6000rpm and 300 lb/ft Torque at 4000, now that is so well balanced such great power just a couple thousands rpms away.. this car is amazing.. it will jet off the line and fly on the run. all the way this car is so damn powerful the torque and hp great and the power is pure consistency. subaru has definitely created a domestic killer.
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Originally posted by downshift
the subaru's die cast aluminum alloy block and aluminum alloy cylinder heads are made with metal stronger than steel and lighter, this kind of aluminum alloy is used for space craft. the iron cast block is just as strong and can take a beating also etc.. but the only thing is that it weighs a lot more. oh yes subaru is so great i just love it to death.
its not the number of cylinders in a car that determines greatness of the car. etc... the WRX n STi are representing the 4cylinder engines. what makes a car FAST is between the balance of torque and horsepower, the STi has got 300 HP at 6000rpm and 300 lb/ft Torque at 4000, now that is so well balanced such great power just a couple thousands rpms away.. this car is amazing.. it will jet off the line and fly on the run. all the way this car is so damn powerful the torque and hp great and the power is pure consistency. subaru has definitely created a domestic killer.
the subaru's die cast aluminum alloy block and aluminum alloy cylinder heads are made with metal stronger than steel and lighter, this kind of aluminum alloy is used for space craft. the iron cast block is just as strong and can take a beating also etc.. but the only thing is that it weighs a lot more. oh yes subaru is so great i just love it to death.
its not the number of cylinders in a car that determines greatness of the car. etc... the WRX n STi are representing the 4cylinder engines. what makes a car FAST is between the balance of torque and horsepower, the STi has got 300 HP at 6000rpm and 300 lb/ft Torque at 4000, now that is so well balanced such great power just a couple thousands rpms away.. this car is amazing.. it will jet off the line and fly on the run. all the way this car is so damn powerful the torque and hp great and the power is pure consistency. subaru has definitely created a domestic killer.
What makes a car fast is the area under the power curve and the ability to deliver it to the road effectively which in the case of Subaru with AWD has the advantage.
What kind of domestic killing are you talking about?
It sure ain't gonna kill my domestic. Doesn't mean that I don't want one though
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There IS a design flaw with the Sti. There's no doubt that many people have been able to get substantial Hp from the motor, but maintaining it is another issue. Apparently, the blown motors were due to issues surrounding the 3rd cylinder. It has been concluded that the turbo was the culprit. It's placement is too close to the cylider block/head creating overheating in that area. I believe this is why some suggest leaving the motor stock. Just an FYI.
Registered User
Joined: Apr 2003
Posts: 1,013
From: california, LOS ANGELES
Car Info: dream car Subaru STi
yes leave the motor stock is the safest way and just add bolt on exhaust and intake, the STi will come to life with just an intake and exhaust system. by the way i love the manual water spray for the intercooler.