Thread: Pulleys on a VE...Is it safe?

I have been reading about the effect of lightweight pullys on the VE.
Some say dont use them because the VE has a 4cw crank.
Should I worry about the life of the engine if I use them?
Is it worth the gains,or Is it gonna hurt my engines life?


I am about to move my VE to a new shell,and was gonna add pullies while it was out.

Thanks for your input
Jay

^^ if i correct (and chim in if i'm wrong), mayb u can use a 8cw crank for more stability at higher rpm as the ve could spin...

my furture motor (god willing):
sr20ve <(from gspec)
16ve n1 cams ,(from gspec)
16ve flywheel
stage 1 clutch
springs & retainers <(from gspec)
inatke
ssac headers
exhaust <( ??? clueless on GOOD one)

^chim in if sopmething else is needed to fit and properly work in b13 se r chasis

bro, ask the all wise miko !!!

Run Gspec pullies

http://www.sr20-forum.com/vvl/11253-there-life-after-7200rpm.html
^check in this thread^

I dont like Pullies on a VE that has a 4 CWC. I feel it will shorten the life of the motor alot if the car is reved high alot. Please dont mistake making power as far as putting them on and how long the bearings will last. If you bring the pullies I install them.

This is my opinion.

Even Nissan made the change back to the 8 CWC in the newer motors.

Here is a look at SR20 motor that dont rev past 7000 RPMs, they all have 4 CWC

SR20VE P11
SR20DE Roller Rocker B15, P11 and U14

Here is a look at SR20 motors that rev above 7000 PRMs, they all have 8 CWC
SR20VE 20V P12
SR20DE B13, B14, P10
SR20DET RNN14, U12, U13, W10, W11


Lets take a look at SR16VE motors

The early ones come 4 CWC. After the first 2 years Nissan changed back to the 8 CWC, makes you wonder why.

The only thing the 4 CWC has on the 8 CWC is weight. The 4 CWC is about 7 pounds lighter which is alot of weight. So that being said a 4 CWC should rev up way faster than an 8 CWC. This is a major advatage.

my question is whats the difference in wieght with the stock crank pully and the after market crank pully?

Interesting.

The weight is not why they make more HP. Its the loss in Diameter size of the pulley where the power is made. You in effect slowing down the PSP, WP, and ALT. This can also be done in reverse by going to a larger pully on the PSP, WP and ALT, which will slow them down also.

I do not know the diffrence in weight but the aftermarket aluminum crank pulleys are lighter. I will throw out a figure of 2-3 pounds lighter. Now every bit of weight lost from the rotating mass is a plus as far as rev speed. Which can be translated into hp on a dyno from the point of the amount of time a motor takes to get from lets say 3000 RPMs to 8000 RPMs. Generally the quicker the motor does the more power the motor is making.

Would a 8 CWC knife edged and lightened to the same weight as the 4 CWC be safer than the 4 CWC at high rpm and would it be safe to use a lightweight crank pulley with a lightened 8 CWC?

^^ i dont think it would be wise to lighten up a 8 counter to accomodate for that much of a difference( 7 pounds) i have a nicely done knifeedged 8 counter weight crank, and it is about 4-5 pounds lighter than it was stock, and there was a fair amount taken of the counters.
also this depends on who does the work on balancing the crank when done with the knifedging process., as i these cranks are well balanced from factory.
in all honesty i think it would negate the purpose of the 8 counter in its original form.
i have you tried crankscrapers?