Care to clarify why you say that the 2000+ sr20's shouldn't use the UR crank pulley? Saw your post in the mailing list and was wondering if you could clarify your statement.

"For all you SR20DE 2000-01, SR16VE and SR20VE owners, do not, I repeat, do
not put any type of aftermarket pullies on your crank. These motors have a 4
counter weight crank shaft that is prone to vibrations in the higher RPMs.
If you put a aftermarket pully that does not have a dampener in it like the
UR pullies you will have premature bearing wear in your motors and also you
can have problems with your clutch bolts or flywheel bolts coming loose. Be
my guest and fuck up your motors."

:(

-01

Originally posted by CleanB15
Care to clarify why you say that the 2000+ sr20's shouldn't use the UR crank pulley? Saw your post in the mailing list and was wondering if you could clarify your statement.

"For all you SR20DE 2000-01, SR16VE and SR20VE owners, do not, I repeat, do
not put any type of aftermarket pullies on your crank. These motors have a 4
counter weight crank shaft that is prone to vibrations in the higher RPMs.
If you put a aftermarket pully that does not have a dampener in it like the
UR pullies you will have premature bearing wear in your motors and also you
can have problems with your clutch bolts or flywheel bolts coming loose. Be
my guest and fuck up your motors."

:(

-01

The you mostly answered the question in your post. The DE has a 8 counter weight crank the 2000+ has a 4 counter weight crank. THe 4 is not internally balanced and needs the dampner that is on the OEM crank pulley to stay in balance as it spins.

Odd - that's the first I've heard of that. But I would definately take his advice.

I'm not sure if I recall correctly but didn't Mike K. say something the exact opposite in an issue of NPM? I just need to get the info straight so I can either remove the pulley or keep it on. I'd really hate to lose the performance increase.

-01

Originally posted by CleanB15
I'm not sure if I recall correctly but didn't Mike K. say something the exact opposite in an issue of NPM? I just need to get the info straight so I can either remove the pulley or keep it on. I'd really hate to lose the performance increase.

-01

Are you sure he wasn't referring to the B13-B14 cars. You will screw up your engine. Maybe not today or tomorrow but it will happen. Think about it, that 4 counter wieght crank is NOT balanced. The 8 counterweight crank is much better. I don't think that UR even recommends them for your car. Even if they do who is going to replace the engine when it gets damaged. Not UR trust me.

here the quote from "Kojima's Garage" on the RR sr20's regarding the pullies...

"Underdrive Pulleys

The Unorthodox Racing Underdrive pulley set from the earlier SE-R models will fit and deliver similar results. Unorthodox has changed there product listings to include the 2000 and later SE."

It doesn't say either way about the positive or negative effects.

Originally posted by CleanB15
"These motors have a 4
counter weight crank shaft that is prone to vibrations in the higher RPMs."


How high is high?

Originally posted by jacen99SE


How high is high?

can't be too friggen high the sr16ve revs near 7800 rpms for its power.. probably more.. im not sure on the exact redline..

The 2000-01 4 counter weight crank is balanced but these cranks are prone to vibrate at higher RPMs. All I am saying is if you get rid of the stock dampner you will shorten your engine life from premature bearing wear.

What you guys need to ask yourselves is why would Nissan and all the other car manufactures put dampened pullies on cars for, what is their reasons behind this. Also if you look at all the American cars that have aftermarket pullies made for them like Mustangs, why do they always make the HP pullies with dampners in them.

What you guys need to do is make a study on guys who have pullies vs guys who don't and see if there is a higher percentage of engine failure for the guys who do.

Lastly the older 8 counterweight crank is less likly to suffer from premature bearing wear because on a hole it is a much better internaly balanced crank.

what is the interchangeability of the 4weight and 8weight cranks? I mean mathematically they should be equally balanced as long as the engineers did their math right, but due to their distance apart being greater, I can see some more vibrations to occur. I would really like a more specific explanation, though, since I might be involved with this,
Thanks,
JCC

The benifits of the lighter crank far outweigh the minimal gains a UR pulley provides. I'd rather have a 2000 crank w/ stock pulley vs. an 8 weight crank w/UR pulley.

As a side note, I own a 323 gtx, and most gtx owners DO NOT use UR pulleys, as they tend to cause vibrations which breaks the water pump pulleys and/or the crank pulleys off. This applies to all Mazda B series motors.

thanks smcser, good explanation and back up,
JCC