Those look like they could be a cool mod. What I like about them is that they are lighter then stock, but are the same size so no underdive which might affect power to the rest of the car or screw up cam timing.

 

I wonder how much faster the Rpm's will rise with this thing in. I doubt if you will free up more than 1 or 2 hp. But you should feel the difference with this piece

 

uuuuhhh.......whats that?

 

Lightweight Crank Pulley.

 

whats the price on that bad boy

 

$134.99. Here's the link: http://store1.vividracing.com/catalo..._1844_675_2037

 

How the hell would a crank pully mess up cam timing? .Go back to school! It only drives the belts.

 

my question is will this be compatable with the echo as well ?

 

It should be, the cars share the same engine.

 

You're right about that

 

"Go back to school?" Well, never been there for auto mechanics, but I did spend a good deal of time with the XB service manual regarding the installation of this pulley. Check out a section called "ENGINE MECHANICAL- Chain Sub-Assembly". It's true the cam gears are on the chain and the cam pulley is on the belt. However, when doing any replacement/service to these components it seems essential that timing markers not just on the cam gears, but also on the crank pulley "damper" be all aligned at the same time. This would lead me to believe that there could possibly be timing issues if the pulley was reduced in size. Perhaps this is just part of the nature of our VVT-i engines or perhaps I'm wrong. Anyways, seems like a reasonable concern and since the Perrin pulley is the same size as stock we don't have anything to worry about.

 

Well just ask the people who crushed their valves improperly installing an underdrive crank pulley in Ford's new 2.3l Duratec/PZEV motor. Here is a portion of the installation for the 2.3l underdrive pulley:

There is a small threaded boss behind the stock damper. It can be found around the 6 o'clock position. The boss has a 6 mm fine thread hole in it. Before you try to loosen the crank bolt, there must be a bolt installed through the damper into the boss. Without the bolt to positively hold everything in position, the balancer or crankshaft will turn as the bolt loosens. If this happens, you lose valvetrain alignment as well as crank sensor synchronization on the crank trigger. Because the 2.3 Duratec/PZEV uses no crank key way, everything is held in place by the torque of the bolt, and can move out of position without it.


He was not incorrect in his concern over screwing up timing. Essentially if the crank is out of sync with the cams, your pistons will kiss the open valves and you'll have an expensive mess on your hands. ;)


I couldn't tell you if this would be the case with the Toyota motor. It is something important to look out for though.

 

That looks sweet. Now all you need is a light weight fly wheel & the engine should be real rev happy.

 

And/or stall happy.

 

its not gonna stall your engine I have the lightened flywheel on my car and it does help you out with the revving :D

 

I guess being a BMW tech for years gives me little tollerance for people who speak mech tech,with out tech knowledge.Maybe that is a fault I should work on.But regaurding the timing marks on the underdrive pully,I feel that anyone who would go through the trouble to make/machine/mass produce,and then market such a pully would take the few extra steps to ensure correct timing mark placement.Assuming the liability in selling something that if not correct could damage someones engine,I would make sure,plus Im sure they did product testing,ALL OF THIS IS A ASSUMED!!!As for the people that messed up their little fords,they messed up when they bought it!!!!!! Now on to my next concern,realisticly,how much power do you expect to get out of the 1.5?are you gonna race,street race,blow the doors off an all motor civic wich is readilly availibe by any kid out there,NO,Face it,the only thing you will outrun maybe is other scions and maybe a school bus or two.......................... I think the focus needs to be future motor swap possibilities.I have comfirmed that the block in the scion is the same as the Celica gts,not that would be a nice way to channel money,into a swap,and custom mounts ect....not on some aluminum pully to replace your perfectly good stock one. :twisted: Ok im done,I could go on for hours! :twisted:

 

I was just thinking that with the lightened flywheel, it won't have as much rotational mass, so when you....oh never mind, I'm retarded. :?

 

It's really tough talking about actual motor tech as I'd say 90% of the people on this forum are the "bling bling" crowd and really have no practical knowledge of how engines and their accessories actually work.

 

I do apoligize has another view point was made to me on why this is good to be posted here and agree with those points.