Feedback on people installing Stillen Crank Pulleys

Rusty · 08-11-2017, 10:45 AM

Hate to break the news to you. I broke a forged crankshaft on a 1970 Chevy LT1 with a four bolt main. 2 months after I installed a lightweight pulley years ago. It broke right behind the first main. You are right about quicker response of the motor. I have installed the ATI dampener on my Z. It's smoother then stock. Motor responses about the same as stock. With the way the oil pump is on the Z. I don't want to take a chance on it failing from high rpm use, like on the track.

jmroy6 · 08-11-2017, 11:43 AM

i agree with Rusty 100%, a lightweight crank pulley is a bad idea on these motors. if anything get the ATI dampener! your motor is not worth the few extra ponies imo.

See post #5 on this thread. GTM Performance Engineering stage 2 600hp supercharger kits line-up press release

SouthArk370Z · 08-11-2017, 11:55 AM

Quote:

Originally Posted by Rusty

... I broke a forged crankshaft on a 1970 Chevy LT1 with a four bolt main. ...

Engines have changed a bit since 1970 - better materials, tighter clearances, more attention paid to balancing, etc. Almost an apples-to-oranges comparison.

That said, I wouldn't run a 370Z (or any other car) without a damper. Just not worth it for the (very) few extra ponies gained, IMNSHO. Maybe for a track car but not a DD.

Rusty · 08-11-2017, 02:18 PM

Quote:

Originally Posted by SouthArk370Z

Engines have changed a bit since 1970 - better materials, tighter clearances, more attention paid to balancing, etc. Almost an apples-to-oranges comparison.

That said, I wouldn't run a 370Z (or any other car) without a damper. Just not worth it for the (very) few extra ponies gained, IMNSHO. Maybe for a track car but not a DD.

I know things have changed. But that was $$$$$ that time. And I don't want to go through that again. Lightweight pulleys are just motor bling. A solution looking for a problem.

Jhill · 08-11-2017, 04:26 PM

I'll put it simple. The oem always try to save what ever dollar they can and in the past there have been engines shipped with non damped stamped steel pulleys (which were very light) and as said on the nicer models would get a harmonic damper. Today people will not tolerate a rougher engine so I can't even think of a car that doesn't come with a damper anymore or else you could bet they wouldn't ship it with one if they could get away with it. The example of the Nissan techs not saying anything really isn't a good example, you would be quiet surprised what you find at dealers these days and if you know anything about what is going on in the industry you would find most of the master techs and upper level techs are leaving the industry and dealers are hiring low wage and under qualified techs (trying to fill the shop with any bodies they can find). Go to that same dealer 6-12 months from now and walk the shop I'll bet you'll see about a 35-40% turnover, dealer anr a revolving door right now and thanks to flat rate of course they'll be willing to sell you whatever work you want especially CP work.

Rusty · 08-11-2017, 07:24 PM

Quote:

Originally Posted by Jhill

I'll put it simple. The oem always try to save what ever dollar they can and in the past there have been engines shipped with non damped stamped steel pulleys (which were very light) and as said on the nicer models would get a harmonic damper. Today people will not tolerate a rougher engine so I can't even think of a car that doesn't come with a damper anymore or else you could bet they wouldn't ship it with one if they could get away with it. The example of the Nissan techs not saying anything really isn't a good example, you would be quiet surprised what you find at dealers these days and if you know anything about what is going on in the industry you would find most of the master techs and upper level techs are leaving the industry and dealers are hiring low wage and under qualified techs (trying to fill the shop with any bodies they can find). Go to that same dealer 6-12 months from now and walk the shop I'll bet you'll see about a 35-40% turnover, dealer anr a revolving door right now and thanks to flat rate of course they'll be willing to sell you whatever work you want especially CP work.

I was an ASE Master Tech at one time years ago. I left the industry because of flat rate, and low pay, and could use my skills making A LOT MORE money in power generation.

Think Trips said it best. Ticking time bomb. Your money, your car. Hopefully nothing happens. But you've been warned.

08-11-2017, 10:45 AM	#1 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 69 Posts: 35,521 Drives: 2011 Nismo GM 6M Rep Power: 2684439	Hate to break the news to you. I broke a forged crankshaft on a 1970 Chevy LT1 with a four bolt main. 2 months after I installed a lightweight pulley years ago. It broke right behind the first main. You are right about quicker response of the motor. I have installed the ATI dampener on my Z. It's smoother then stock. Motor responses about the same as stock. With the way the oil pump is on the Z. I don't want to take a chance on it failing from high rpm use, like on the track. CJBinder likes this. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

08-11-2017, 11:43 AM	#2 (permalink)
jmroy6 Base Member Join Date: Sep 2015 Location: CT Posts: 179 Drives: Spirited Rep Power: 235	i agree with Rusty 100%, a lightweight crank pulley is a bad idea on these motors. if anything get the ATI dampener! your motor is not worth the few extra ponies imo. See post #5 on this thread. GTM Performance Engineering stage 2 600hp supercharger kits line-up press release CJBinder likes this. __________________ 2012 370z GTM SC

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08-11-2017, 04:26 PM	#5 (permalink)
Jhill Track Member Join Date: Mar 2016 Location: San jose Posts: 854 Drives: 2013 370z sport Rep Power: 3385	I'll put it simple. The oem always try to save what ever dollar they can and in the past there have been engines shipped with non damped stamped steel pulleys (which were very light) and as said on the nicer models would get a harmonic damper. Today people will not tolerate a rougher engine so I can't even think of a car that doesn't come with a damper anymore or else you could bet they wouldn't ship it with one if they could get away with it. The example of the Nissan techs not saying anything really isn't a good example, you would be quiet surprised what you find at dealers these days and if you know anything about what is going on in the industry you would find most of the master techs and upper level techs are leaving the industry and dealers are hiring low wage and under qualified techs (trying to fill the shop with any bodies they can find). Go to that same dealer 6-12 months from now and walk the shop I'll bet you'll see about a 35-40% turnover, dealer anr a revolving door right now and thanks to flat rate of course they'll be willing to sell you whatever work you want especially CP work.