Power size pulleys

[airstuff]

When does one need a powersize pulley,how good or bad are they for driving on the street?(engine overheating etc...)

Do I need a power pulley If my engine is revving past 7000 rpm?

[airstuff]

Who's running berg power size in the street?

[181]

you´ll be fine with the stock size. Smaller pulley means your fan will turn slower and this is something you don´t want. Maybe you can compensate the power pulley with using a Porsche 356 generator upper pulley (smaller then VW) to keep the ratio, but I didn´t do a math for this.

[ian c]

i think the ratio is right with a 356 upper , but due to slip it doessnt matter 

[Bruce]

When does one need a powersize pulley....

When the weather is cool enough to allow it.

[ian c]

When does one need a powersize pulley....

When the weather is cool enough to allow it.

or when one wants to get in the "kaboom , bits falling off" thread 

[Jim Ratto]

I run one throughout the winter months, unless we have 85+F like we are now.
As long as my oil temperature stays under 200F under hard, continuous driving, I haven't seen any ill effects, and I look for them.
Kind of a odd hop up thing, as they really, on a big engine, only give a fractional boost in hp. I notice a little difference in the lower gears up over 4500. What's nice is that it's easy enough to swap if it does get hot out. Maybe 30 minutes?

[JS]

I am very happy with switching to power pulley size. My oil temp would never go past 65-70 degrees celcius(150-160F), but on a really warm day in Norway(32c,90F) I got it up to about 100c(210F) after switching to the power pulley. We don't have California weather over here unfortunately... 
The only drawback is that my 6v generator won't give much charge when the engine idles with the power pulley. I have to check out the 356 pulley, never thought they were smaller.

[nicolas]

What's nice is that it's easy enough to swap if it does get hot out. Maybe 30 minutes?

how about the whole crank, flywheel, rods,... balance? i think it will effect the overall balance, especially if the engine revs over 5000 rpms that must have an influence on the bearings and case.

[stealth67vw]

I have run a power pulley year round for 3 years of daily driving from 15F to 115F and have no discernible problems. It does get a little warm when it's 115 out, oil gets to 205 and heads get to 300 on the freeway. I live in a very mountainous area with lots of grades too. The engine is a sweep the floor 1641cc with ratio rockers, stock heads, 8:1 compression, stock cam, 1 5/8 Berg header and dual Solex PBICs and a POS Empi 36hp shroud.

[benssp]

I ran a power pulley on my 1776 - FK10, 1.54 Rockers, 9.5:1 compression, was fine in traffic, went to power pulley as standard size liked to flip the belt at 6.5K

[Bruce]

.... I have to check out the 356 pulley, never thought they were smaller.

Stop!  Using a 356 pulley with a power pulley is dumb.  It gets you the same fan speed as you'd get with all stock VW pulleys.

... went to power pulley as standard size liked to flip the belt at 6.5K ....

Cheap belts do that.  Get Gates.

[drgouk]

Whats the Dia of a 356 pulley? I was thinking of using one with a dry sump pulley, So I can use an autocraft pump.   

[rick m]

DrGouk,

I ran an autocraft pump on my off-road car with the Powerpulley and a 356 alternator pulley.  It worked great. It was a 2110cc motor with a blow through turbo set up on it.  It ran cool and I never had overheating issues...even here in Arizona.  Take it from those who have done it.

Don Bulitta saw my car and took a ride in it. It was a legitimate high 12 second motor. My 67 bug would run 13.90's and the off road car would kick its behind.

Rick Mortensen

[drgouk]

DrGouk,

I ran an autocraft pump on my off-road car with the Powerpulley and a 356 alternator pulley.  It worked great. It was a 2110cc motor with a blow through turbo set up on it.  It ran cool and I never had overheating issues...even here in Arizona.  Take it from those who have done it.

Don Bulitta saw my car and took a ride in it. It was a legitimate high 12 second motor. My 67 bug would run 13.90's and the off road car would kick its behind.

Rick Mortensen

Thanks for the seat of the pants info Rick.

David Gouk