pulleys

I have a 1987 toyota supra turbo and i have heard some rumors that putting unorthodox racing pulleys on it will make it over heat. Any info about this would be appreciated. Thankx

Not unless you have the most clogged up and corroded cooling system ever (which could be very possable after 15+ years if neglected). With that being said it might be a better investment to put that money into a larger aftermarket radiator, good fluids, and maybe a new water pump. It's always a better idea to do modifications to improve the reliabiltity of the car before any others. Installing the underdrive crank pulley could cause some distant future issues with bearing life though, because of the non-existant harmonic balancer/dampener but that's a moot point I suppose.

Thankx for the input, I didnt expect anything to go wrong with using the pulleys but many people told me otherwise the cooling system is in top shape considering i just replaced everything. My baby is like new!!! thankx again

u can run the other pulleys except the crank pulley its balanced and if u put on the light one it will be off balance and cause some serious engine destruction! its been a long time since i have been a newbie! 3500 post later and now i get to start all over!

All crank pulleys are balanced, there round, the only difference between the Unorthodox and the stock pulley (besides the obvious weight and underdrive) is the stock pulley is dampened. There are frequencies at certain RPM created by the firing cylinders that travel through the crankshaft and the stock dampener/pulley will help cancel them out leading to longer engine bearing life like I said earlier. Again though,this is a moot point because if you're running on a higher HP modified engine your bearings aren't going to last 150K+ miles like stock anyway.

running a different pulley in place of the stock crank pulley the car will not last 5k.. also i agree with the stated and its not balanced as well so the stocker is fine and u can change out all the other pulleys if u would like...

You have an Unorthodox crank pulley that made your car crap out bearings after 5K miles? There are alot of these crank pulleys out there and you never hear of any problems with them besides what I stated and a few peoples lightweight flywheel issues. If what you said was true then no one would buy them, and equally no one would sell them. This will not cause your engine to fail after 5K miles, it will not cause it to fail after 75K miles. You are more likely to cause your engine to fail by not watching fluid levels than the pulley is to cause engine failure. Here are a few threads to help, :)
http://www.unorthodoxracing.com/faq_pulleys.html
http://www.supraforums.com/forum/showthread.php?threadid=4552

Thats for the mk4 supra! she has the 7mgte 2 totally different motors. It's been covered iirc a year or 2 ago on sf's mk3 section! big arguement over it then they finally came to the conclusion since the lightweight one is one solid piece it isnt harmonicly balanced therefore throwing it off balance and i dont care if it wouldnt cause damage as much over time, I personally wouldnt want it to cause damage at all! now for all the other pulleys i'd say go for it! hit up the good Dr Jonezz mkiiitech.com

o yea btw dont think im tryin to start an arguement or seem like an ass, i say this cause u dont kno me just yet and my replies might seem like im tryin to be an ass! lol plz dont take me the wrong way! take care buddy

I know man, nothing personal and I would rather not argue also but there are alot of new owners that float through here and I don't want them getting wrong information. It is much harder to relearn something than it is to just learn it right the first time. :p I'm not trying to defend the pulleys, only the wrong information. Like I said in my first post I would do alot of other things before swapping pulleys, underdriving them was not what they were designed for so it's only going to put more strain on power steering and the alternator at idle but that still will not create any serious engine problems. The JZ and M are not as different as you would think, 24 valves, 3.0L, I6, you get roughly the same harmonics and vibrations (which are very little in a inherently smooth I6 anyway) in both motors so the same problems apply to both. I know all about SF, I've been a member since early 2002, I can remember the old SF before this new fangled black/grey. :biggrin: Anyway most members on SF will argue over parts they don't even have, alot of people seem to jump on the bandwagon without any personal knowledge about the part there speaking of so it just adds to the rumor that may have started from truth. I don't post about something unless I have personally seen it done or experienced it myself, a local owner here had the entire pulley kit running for years with zero problems from it (he didn't have a lightweight flywheel so I can't comment on that problem though). You have to stop saying it's balanced, a balanced crank pulley would be something from a Model T or a seriously antique engine to balance the rotating assembly. Balanced would also be the same thing as the flywheel couterweight in a rotary, our engines need no external balancing. What you should be saying is the Unorthodox is not dampened which still isn't going to make any 7M shoot out bearings. Anyway yes, this post has gotten way out of hand, I've said my part so I'll let it go. I don't take anything the wrong way so don't worry, glad to have you here. :)

yes they are something i wouldnt want for numerous reasons! most that u have posted! also there isnt much horsepower to free up in the front so i would leave them be! now for a light weight flywheel go for it! helps alot! there more power to be made besides worryin with the pulleys! Thanks bud!