Unorthodox Pullies 4 banger

[ccordex00]

I've done some research but so far there's no concrete answers about the gains and problems when using the underdrive set from UR on a 4 banger. Some people say it's ok for a v6 since they don't mess with the balance of the crank but how about 4 bangers? anyone have any experience using this set??..if properly installed are there any chances of messing up engine components?

 

[FallenAngelHIM]

i have the aem tru-power pulley pack. in the course of my research about pulleys, i find that it's best not to mess with the crank pulley unless you work in a mechanic shop that can repair it. the aem pulley set is just the alternator and powersteering, i think. there is a UR pulley kit that is without the crank pulley. its safe to use underdrive, its safe to use lightweight, but i wouldn't use a crank pulley since it will affect the cylinders and rods.

 

[BlkCurrantKord]

There's been no documented evidence of a lightened crank pulley damaging an engine. If there was damage, it was from install error. Fluidampr makes the best "pulley" out there for the H/F engine. However it requires losing P/S.

 

[Crono139]

There's been no documented evidence of a lightened crank pulley damaging an engine.

Exactly. No problems have been blamed solely on a lightened crank pulley.

As a side note, UR has two types of pulley kits available. One is an underdrive kit, while the other has stock diameter pulleys.

 

[zitro_pr]

Aem tru-power pulley

i have the aem tru-power pulley pack. in the course of my research about pulleys, i find that it's best not to mess with the crank pulley unless you work in a mechanic shop that can repair it. the aem pulley set is just the alternator and powersteering, i think. there is a UR pulley kit that is without the crank pulley. its safe to use underdrive, its safe to use lightweight, but i wouldn't use a crank pulley since it will affect the cylinders and rods.

I am looking information about Aem tru-power pulley because I am interested in use on my accord 4cyl. do you Feel enough difference using this product?Need opinion and suggestion !!!

 

[nyknick1015]

yes i am curious too... they say 10-15hp increase but what mod doesnt say that... can some1 answer with sucessful numbers

 

[S-spec]

The OEM crank pully has a rubber dampener in it that helps absorb vibrations and crank flex. Using after market crank pulleys which lack the dampener has been correlated to premature oil pump failure.

I have tried to find hard evidence of this, and it does somewhat make sense, but even then, I suppose its still a gamble!

 

[pyaarawala]

Exactly. No problems have been blamed solely on a lightened crank pulley.

As a side note, UR has two types of pulley kits available. One is an underdrive kit, while the other has stock diameter pulleys.

What's the point of using a stock diameter pulley?

 

[BlkCurrantKord]

UR pullies use the stock diameter, just lighter weight.

AEM uses larger diameter pullies.

 

[Crono139]

UR pullies use the stock diameter, just lighter weight.

Correct.


"What are Unorthodox Racing Ultra/Tuner Series pulleys?"

Our pulleys are available in three (3) types:

FIRST - Accessory pulleys (Ultra A) for air pumps, alternators, idlers, power steerings & water pumps. These pulleys are the same diameter as the OEM (original) pulley/s, in most cases, they are replacing but they are much lighter. The accessory pulleys are included in our pulley sets, these sets also include the crank pulley. Even if you buy a crank pulley first the accessory pulleys for most models are available separately. So you are never locked out of the full set and the maximum potential HP gains.

SECOND - Crank pulleys, which are available in three (3) versions. First Version: underdrive crank pulleys in standard belt layout (Ultra S). They drive all the accessories that your came with from the factory. This version is up to 20% smaller in diameter and they are 60-90% lighter than the stock pulleys they replace. This is why we do all of the underdriving at the crank pulley, to maximize the reduction in weight on the crank. Second Version: stock diameter crank pulleys, also in standard belt layout (Ultra Sc & Tuner S), designed to maintain alternator output at stock levels for car owners with big stereos (over 600 watts) or for audio competitions where system voltage must maintain specified levels (see your sanctioning body's rules). For cars with superchargers it maintains the original level of boost from the aftermarket supercharger kit. Third Version: underdrive single belt conversion (Ultra R) that drives only the alternator. It is used for engine swaps or for the racer where only the alternator is being used. The same percentage of underdriving as the Ultra S version but is 90-95% lighter than the OEM pulley it replaces.

THIRD - Pulley sets, which are available in two (2) versions. First Version: is the underdrive sets in standard belt layout (Ultra SS). These sets include the underdrive crank pulley (Ultra S) and the accessory pulleys (Ultra A) for the air pump, alternator, idler, power steering and water pump, depending on your application. There is no additional underdrive with these sets, they are the same amount as with our crank pulleys (Ultra S). The a/c is still driven from the crank pulley in this version so don't think it has to be removed or can't be used. Second Version: stock diameter standrad belt layout sets (Ultra SSc). They include the stock diameter crank pulley and the accessory pulleys (Ultra A) for the air pump, alternator, idler, power steering and water pump pulleys depending on your application. This version is designed to maintain alternator output at stock levels for car owners with big stereos (over 600 watts) or for audio competitions where system voltage must maintain specified levels (see your sanctioning body's rules). For cars with superchargers it maintains the original level of boost from the aftermarket supercharger kit.