Radiator pipes needed / Top quality

[SUBARUCONVERT]

if the toyota ones only last 30k over 100k then they must be crap, ive seen a number of 200k old subaru timing belts at work (this is going off how u were talking). Therefor everyone should buy subaru belts for there toyotas

Lets see, assuming a four cylinder opposed engine, that's half the number of cylinders per cam drive, so slightly more than half the load per belt. Suprised they don't last 250,000kms or more

Even if it was a six cylinder opposed, or 3 cylinder in line that'd be 3/4 of the load so 200,000 vs 130,000 seems about right ...Next


BTW you'd have been better off picking a Honda as your example (though there's flaws with that argument as well) a lot of them have 160,000 service intervals.

There may only be 2 pots per cam, but have 4 cams vs 2 must make for more friction and a higher belt load. Also being 2x the length of a usual twin cam belt must make it more suspetible to breakage/failiure (altho being longer lets the belt do less rpm than a normal one so takes some stress away). also using ur logic, V6 toyotas must be able to have an extended belt life over the V8 and L4 engines, but thats not the case


P.S subarus new EZ sixes use a cam cain also, but to make the engine shorter

it sill dose the same rpm as well i dont know how you worked that out unless the cam now spin at 1/4 engine speed instead of half

i think youll find your logic is flawed and with a little more basic phycis behind you you might put up a plausable argument :d

v

Im not talking about the cam doing less speed, the belt itself will be going SLOWER if its LONGER, i.e If u have two pulleys of the same size 1 meter apart doing 1000rpm (pulley speed) then the same size pulleys 5 meters apart again doing 1000rpm, the belt RPM would be reduced as there is more belt to follow the pulleys

[no_8wire]

err no it would still be going the same speed...
Thats like saying 2 cars with the same engine but one has a longer drive shaft , that one will go slower... its all rotational, the belts are connect to the pulleys and unless teh belt is slipping on the pullys then the belt will be doing the same as the pullys.

[fivebob]

Im not talking about the cam doing less speed, the belt itself will be going SLOWER if its LONGER, i.e If u have two pulleys of the same size 1 meter apart doing 1000rpm (pulley speed) then the same size pulleys 5 meters apart again doing 1000rpm, the belt RPM would be reduced as there is more belt to follow the pulleys

So the entire belt does less work per engine revolution, and therefore will last longer in terms of the distance that car travels, as belt life is determined by the number of duty cycles it performs.

[SUBARUCONVERT]

Umm thats exactly what i had said in the first post, Yes speed of the belt will stay the same, but RPM reduced

[SUBARUCONVERT]

err no it would still be going the same speed...
Thats like saying 2 cars with the same engine but one has a longer drive shaft , that one will go slower... its all rotational, the belts are connect to the pulleys and unless teh belt is slipping on the pullys then the belt will be doing the same as the pullys.

Belt RPM isnt the same as pulley RPM

[fivebob]

err no it would still be going the same speed...

Actually he is right , well sort of but the terminolgy is a bit misleading. There are three things that are different, engine RPM, Belt RPM (or duty cycles per minute may be more appropriate) and belt speed. Belt speed is directly related to engine RPM, belt RPM is related to the length of the belt and the "speed" that is being referred to appears to be belt rotational speed, not belt lineal speed.

Confused now

[SUBARUCONVERT]

TO be honest i did have Speed and RPM mixed at first, i later reilised they werent the same

[vvega]

err no it would still be going the same speed...

Actually he is right , well sort of but the terminolgy is a bit misleading. There are three things that are different, engine RPM, Belt RPM (or duty cycles per minute may be more appropriate) and belt speed. Belt speed is directly related to engine RPM, belt RPM is related to the length of the belt and the "speed" that is being referred to appears to be belt rotational speed, not belt lineal speed.

Confused now

i thing what you meaning is that becase the belt is longer if you maked a tooth on the belt white it would not end up back where it started after the engine cycle given that though the belt speed is the same the distance its travels is longer
in this case it would take 2 engine cycles(induction compression blabla) to return to its origin

but it still passes the same number of pullys as it would on a inline 4
and again it witness's half the load

so again
the belt speed (teeth per second) count is the same
the load it encounters is less because on any one cam tooth it is only moving a 2 cylander cam

i thought it was a simple concept ??

in all hoesty its prooly what you just said hopfull in a less confusing manor

v