Question:
The Toyota Corolla even Yaris has Dual OverHead Cam, comes standard. On the non-turbo Subaru's it is SOHC.Why can't they use DOHC? I like the Legacy 2.5i, but since it's SOHC, is it slow? or does it have good pick-up?
Answers:
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Subaru switched back and forth several times. In the end especially on non turbo models they found that the gains from a DOHC setup were basically offset by the losses to additional rotating mass etc and unnecessary complexity. Also a DOHC boxter motor requires 4 camshafts instead of 2 like an inline engine. Back when they started selling the "sportier but still not a wrx" 2.5 RS they were DOHC for a year or two and then went back to SOHC without any real change in the power of the motor. Heck the new corvettes are killer fast and they have a single not overhead cam and they do fine. DOHC in and of itself doesn't really make that much extra power, its just easier to build a 4 valve per cylinder engine with opposing pairs of valves with 2 cams instead of one.So i hear that gear 1 on a automatic car blows your transmition is it true?
DOHC cost a lot more than SOHC. The Legacy 2.5i is not slow, and is cheaper to insure. Very good car.WHAT SWAP iTS BETTER 4 MY 89 CRX Si?
DOHC and SOHC have nothing to do with speed really. It is a twin cam engine (being a boxer), so its the same as having a DOHC inline engine. Having DOHC on a 2 headed engine means four cams, which adds a ton of rotating mass, for really no gain (especially on a 4 cyl car).Are monroe shock absorbers for 2001 Jeep grand cherokee ok or is there a better brand?
y2whateverhisnameis (the first poster) was spot on.
The DOHC is available in the 3 litre H-6. It used to be available in the 2.5 H-4 in the mid 90's. My 93 Legacy is a 2.2 H-4 DOHC. The 2.i SOHC is excellent. It is not slow has very good pick up, a nice ride and great handling. It is 173 HP. The 2008 Legacy will come with the optional 3 litre DOHC H-6 engine. The 2.5 SOHC is a powerful engine that delivers well especially in the Impreza.
I had a 2.5i and quickly passed this car on to my (*adult*) daughter and got the 3.0 H-6. I felt the 2.5i was kind of slow on merging or getting out of stop signs. 0-60 is around 10 seconds with an automatic transmission. My new car isn't a WHOLE lot better - maybe under 8 seconds - but it seems to have more right off the line than the 4-cyl has.
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there is a few resons for subaru not to make a dohc engine.Audi 90 quattro CS - bolt on serpentine pulley broke while driving?
firstly it is allready a fery tight squese where the heads are on the engine it would be very hard to fit another two cams (one for each head).
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secondly, at the moment the heads are allready running 16 valve system. there isnt much point adding an extra cam for one extra valve per cylinder. you wouldnt even get much power in it.
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the only reson you would really want a dohc on the subaru motor (example the EJ22) would be for more power. if you want the pewer simply go for the turbo. or get the sti heads installed.
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