Lightweight pulley wow

[karma003]

Taking another look at it, I figured it out. I think those dimples on the edge for the static timing. Advancing or retarding the time & those stand for the degrees & limits of advancing & retarding I believe. They used to put little notches on the lip, I'm going to throw out a random guess & say that's what I think it is

[Sportsguy83]

Originally Posted by karma003

I used to be a technician at a Toyota dealer, I didn't do too many engine rebuilds due to the fact that Toyotas r pretty reliable, (& most were given to my buddy the master tech there.) But to my recollection, they weren't ment for any kind of balancing I don't think.

First, remember that this is a Subaru engine block, so don't expect the same behavior as with a Toyota engine (NOT saying that they are not the same but just make no assumptions based on previous Toyota engines because this part of the engine is not Toyota). Looking at the car engine manual on page 28 of the PDF (Page EM-19 on the manual), the tool does not seem to attach to those holes.

Edit: You are most probably right that the Pulley is balanced by itself. We are just looking here for direct and exact confirmation that it is.

Originally Posted by karma003

Taking another look at it, I figured it out. I think those dimples on the edge for the static timing. Advancing or retarding the time & those stand for the degrees & limits of advancing & retarding I believe. They used to put little notches on the lip, I'm going to throw out a random guess & say that's what I think it is

You might be right on this as I have not really dealt with timing a car for SOME years now and never with a Subaru/Toyota.

[karma003]

Originally Posted by sportsguy83

First, remember that this is a Subaru engine block, so don't expect the same behavior as with a Toyota engine (NOT saying that they are not the same but just make no assumptions based on previous Toyota engines because this part of the engine is not Toyota). Looking at the car engine manual on page 28 of the PDF (Page EM-19 on the manual), the tool does not seem to attach to those holes.



You might be right on this as I have not really dealt with timing a car for SOME years now.

Lol last cars I was timing were 90's models. My miata & buddy's 240sx & of coarse plenty of older Toyotas. I'm not sure if things have changed or not, & considering there isn't a distributor anymore (but Idk if Subaru still does do them, Idk) then I don't understand the perpose of having static timing dimples/notches on the balancer for? &

[Sportsguy83]

^^ I edited my post above while you were quoting me.

[CircuitJerk]

This looks like a cast part that requires balancing on it's own and has to be independent of the internal crank balancing.
To prove this, I suggest you compare a few pulleys. If the balancing drill marks are in different places and vary in depth then it is most certainly as I'd suspect. In no way would that be reliant or matched to a single motor...

[karma003]

Originally Posted by sportsguy83

^^ I edited my post above while you were quoting me.

Lol oh ok, well yea. I mean I'm not the engineer or anything. Buy I wouldnt think they'd expect holes to balance out a whole motor. Only 2 small dimples at that.

[karma003]

Originally Posted by CircuitJerk

This looks like a cast part that requires balancing on it's own and has to be independent of the internal crank balancing.
To prove this, I suggest you compare a few pulleys. If the balancing drill marks are in different places and vary in depth then it is most certainly as I'd suspect. In no way would that be reliant or matched to a single motor...

That's what I ment by how would one go about buying a new pulley if each pulley was specific to the motor it came w

[CircuitJerk]

Originally Posted by karma003

That's what I ment by how would one go about buying a new pulley if each pulley was specific to the motor it came w

My apologies, I may have skipped a few posts.

[Sportsguy83]

Originally Posted by karma003

That's what I ment by how would one go about buying a new pulley if each pulley was specific to the motor it came w

I definitely agree with your logic. We just want exact confirmation this is the case. Remember, a crank pulley is not something that you replace if ever on an engine. I do know by fact that motor builders sometimes balance pistons, crank, pulley, rods, flywheel and some even go as far as clutch assembly. BUT I have no idea if any car manufacturer would go as far as the pulley on balancing (logically seems they wouldn't). Also, I'm not bashing the pulley as there are nothing but positive reviews about it around the web. I just like having all information at hand. :happy0180:

[karma003]

Originally Posted by CircuitJerk

My apologies, I may have skipped a few posts.

Lol its ok, I did too

[karma003]

Originally Posted by sportsguy83

I definitely agree with your logic. We just want exact confirmation this is the case. Remember, a crank pulley is not something that you replace if ever on an engine. I do know by fact that motor builders sometimes balance pistons, crank, pulley, rods, flywheel and some even go as far as clutch assembly. BUT I have no idea if any car manufacturer would go as far as the pulley on balancing (logically seems they wouldn't). Also, I'm not bashing the pulley as there are nothing but positive reviews about it around the web. I just like having all information at hand. :happy0180:

Lol that's understandable, but I think ur going to find it vary hard to prove this.. I guess "theory" if I'm sure even the engineers thought of it to be common sense. Idk where u would go to look up that kind of basic info

[Captain Snooze]

Originally Posted by Captain Snooze

Incorrect. It depends on the number of cylinders and configuration. Inline 4; unbalanced. Inline 6;balanced. As for vees it depends on on number of cylinders and vee angle.

Originally Posted by karma003

I believe this is incorrect & the lad is right but made a typo when one is heading back ones heading out. Meaning that its using the law of physics what's in motion stays in motion. & for every action there's an equal & opposite reaction. So the force is never lost, but helps keep the motor keep moving more smoothly. As for v shaped & inline motors, the forces r thrown into a random counter in the motor & the pistion going up at the same moment is thrown off

http://www.zhome.com/ZCMnL/tech/harmonics.htm
http://what-when-how.com/automobile/...ce-automobile/

"Vibrations not normally included in either primary or secondary balance include the uneven firing patterns inherent in some configurations.
The above definitions exclude the dynamic effects due to flexure of the crankshaft and block and other force induced deformations."
https://en.wikipedia.org/wiki/Engine_balance

[Mongo]

fyi - If you are like me and got one of the early packaged pulleys. the instructions don't give you torque specs. The newer packaged pulleys give full directions

Spoke to Perrin, they told me to oil the bolt (no brainer) and start at 33 foot pounds. Then from 33 pounds go to 94 pounds (should get at least a 45deg turn from 33 to 94 if not replace your bolt).

I would also mention the crank bolt is on there really good a good size cheater bar made life a lot easier.
----

also Perrin said there pulley isn't balanced. (may have already been confirmed, i might have skipped a few posts)

---

To anyone still trying to decide on this mod. Its a 100 dollars well spent. A definite improvement in throttle response.

[Enigmus]

Here's my DIY for installing the Perrin crank pulley.
http://www.ft86club.com/forums/showthread.php?t=12583
Very easy and a nice upgrade! worth every penny!