...can i just tighten them down by a wrench as tight as i can get them...
The tenor of
that question makes it imperative that you use a torque wrench.
If you said, 'I have a fairly well 'calibrated' elbow...I can torque anything real close to spec by touch..do I
have to use a torque wrench?' Well that kinda answers itself, don't it?
'..as tight as I can get them..' is silliness. That attitude will get you broken front axle cap studs, broken seat bolts, broken rear suspension components and destroyed fork triple/top clamps.
If you do not have a clue as to the difference between 80in/lbs (say for the clutch bolts) and 14-18ft/lbs (fork clamps), you'd best be using a wrench.
In SOME cases, the indicated torque values are
too high anyway! You must have the sense to 'feel' what's going on.
Otherwise, expect great big huge fat troubles.
Are you seriously asking what the point is of torqueing the cylinder/head bolts?
If so...consider the pressures those pieces are subjected to. Besides the static compression of the piston movement (which is piddly) think of the tremendous pressures involved when a handful of air/fuel burns to the extent of
thousands of degrees!!..and the pressure from
that!. Then you have metal subjected to those thousands of ºs that is going to expand and contract upon the running/shutdown of the engine.
The fasteners that hold all this together need to be
working together! That means one cannot be loose while the other is tight. And 'loose/tight' in this case means just a few pounds of difference in torque values.
'..who does this..'? If that means who either uses a torque wrench or is experienced enough to
have that 'calibrated elbow'..the answer is
everyone who has the brains God gave them.
Yes. MotionPro does make an adapter for such. Keep in mind (of course you will!) that if you keep the adapter at 90º to your torque wrench, the value listed in the manual does not change on your wrench.
IF the adapter is ever applied to the fastener at an angle other than 90º, the supplied formulae must be used to determine the setting you must use on your wrench.
Oh...it's obvious isn't it that the adapter does not preclude the use of a torque wrench? It is used
with the torque wrench.
Cheers!