Timing belts have been used for quite a while because they are effective, for both cost and reliability. Timing chains aren't exactly state of the art...
Timing chains have been used since the early 1900's while the "Gates" Toothed belt system didn't show up until the 1960's. So which is the old tech? That said, the Subaru H6 and new H4 diesel engines use chain drive for their cams. I think this was done as much for space saving as anything else but I might be wrong. Expect to see chain driven cams on the new DI H4 engines that should be making their debut for the 2011 or 2012 MY.
Well, the very first one may be the DI 2.0L in the Toyobaru Coupe sometime in 2010-2011 but we might also see it as a new engine in the Impreza/Forester/Legacy lines in a 2.3-2.4L version.
I'm just guessing but I think they will use the 2.0L Diesel as a pattern for the new DI gas engine layout. So, along with the chain drive camshafts that will also mean tighter bore spacing and longer strokes using same style rods as the diesel and H6 engines. The smaller bore and bore pitch is done to reduce the front to back length of the block assembly and makes tuning for reduced emissions easier in the tighter combustion chambers. Increased efficiency may allow them to reduce the displacement from the current EJ25 (2457cc) down to 2300-2400cc and still have a more powerful engine that returns better fuel economy. So look for 180-185hp or so in the base NA engines and up to 330hp or so in a full out STI version.
Very old thread I know but I have a question about chain vs belt. Is the belt reliable and just cost a lot to replace, or is the chain better all around?
I would prefer a chain. don't have to wonder if it is going to break or not, as long as your aren't beating on it. some timing belts aren't bad to change, some are ridgoddangdiculous to change. Subaru is about the eaiest one I have had to change.
I have a 2003 EJ25 with 5 speed manual trans. I'm currently tearing the motor down to replace the head gaskets. I need torque specs for tightening the valve cover bolts, exhaust manifold bolts, intake manifold bolts and re-using head bolts.
Also I need to replace some small hoses. I need to...
Gentlemen,
I have a new stock build 2.5 SOHC in a 2005 Forester. Everything went together within the specs of the service manual. There were no issues.
First fire up, the external mechanical oil pressure gauge showed 80 lbs of oil pressure. When warmed up after awhile it drops down to 12 lbs...
I have a 06 forester ej 2.5l. I was looking at getting a motor from the junkyard but was concerned that not all ej25s would fit from different models of subarus? The car I was pulling it out of is a 09 legacy ej25 2.5
I'm not sure what years/models would fit, I read about the variable valve...
My 2010 non-turbo, 106k miles, timing all replaced, and throttle body cleaned, seems to be running OK but there is something odd I cannot find and don't know if it is normal. I don't recall if it did this before the throttle body was cleaned.
When I 'punch' the accelerator, not to the floor...
I am trying to install a block heater into my 09 Forester 2.5X, the issue I'm having is removing the frost plug, that thing is tight! Any tricks? I've used a low profile 14 mm hex with a box wrench over the ratchet handle for extra leverage. It didn't work, I also had a swivel head plus...
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