ECUTune Stage III twin screw supercharger sign up - Page 20

longassname · #**286** 10-21-2005, 09:15 PM

There's a lot that goes into machining a pulley. It's a lot of work.

Quote:

Originally Posted by SVXRide

Just too many toys!

-Bill
p.s. have you thought about setting up a rig to do your own line of pulleys and crank dampers (stock and underdriven)? Seems to me all you need is a good local plating shop

lhopp77 · #**287** 10-21-2005, 10:24 PM

To bad that I don't still manage the machine shop. Those pulleys would be a piece of cake on a CNC machine. After programmed could pop them out in couple minutes each. Actually we never machined much aluminum--mostly stainless, hard steel (8620) and monell.

Lee

longassname · #**288** 10-21-2005, 11:15 PM

Ya, I'm actually very unhappy with the manual mill. I'm going to stick with a manual lathe but my plans for the mill are to go all the way up to a 5 axis cnc set up that we can use for making plastic molds as well as metal parts. I don't know about minutes though on the pulleys. You'd save a lot of time with not having to do measurements but there is still a lot of material to remove and a lot of the cuts are very aggressive by nature and can't be duplicated with smaller tools even at controlled angles.

Quote:

Originally Posted by lhopp77

To bad that I don't still manage the machine shop. Those pulleys would be a piece of cake on a CNC machine. After programmed could pop them out in couple minutes each. Actually we never machined much aluminum--mostly stainless, hard steel (8620) and monell.

Lee

longassname · #**289** 10-29-2005, 07:57 PM

I've been convinced to go ahead and step up the belt for the supercharger and power steering to 6 ribs on the base system as well as the high boost sytem. This means I'll have to machine power steering pulleys too. I made the first crank pulley for the standard systems today and took some pictures of it next to the factory crank pulley.

SVXRide · #**290** 10-30-2005, 01:18 AM

Michael,
Looks nice! What's your tolerance on the balancing (vs the level to which the stock piece is balanced)?
-Bill

longassname · #**291** 10-30-2005, 09:28 AM

It's machined from a solid piece of aluminum and every surface is turned on the lathe; It should be balanced. As I was mentioning earlier there is a whole lot of machining that goes into this pulley. I'd hate to guess how many passes it takes to make one. The blank starts out weighing as much as the factory crank pulley ( 4 lbs 12 oz) and ends up weighing half as much ( 2 lbs 6 oz). With all the machining done on the lathe the whole thing should be concentric and therefore ballanced.

Quote:

Originally Posted by SVXRide

Michael,
Looks nice! What's your tolerance on the balancing (vs the level to which the stock piece is balanced)?
-Bill

longassname · #**292** 10-30-2005, 09:45 AM

I think what you may be thinking of isn't so much ballancing of the piece but why they are often called harmonic ballancers. My understanding of this is that the function of the piece is generally missunderstood. If my understanding is correct then the harmanics they are worried about ballancing are not engine harmonics but harmonics that can occur with more than one accessory being driven on the same belt. Hence back in the days of half a dozen v belts they were called crank pulleys and when they switched to ribbed belts driving multiple accories they became harmonic ballancers. OEMs go to great lengths and expense in their accessory drive design process to ensure that no resonances occur at any operating rpm.

SVXRide · #**293** 10-30-2005, 07:16 PM

Michael,
Probably a little of both....there are going to be tolerances inherent to your lathe just like their are tolerances inherent to the set up that Subaru's supplier had to produce the stock harmonic balancer...just curious as to what you believe your lathe will provide (ie. concentric to within .001?). I'm also curious - and this has been a discussion topic for a while on this site - what you think about the long term effects of having a solid crank pully versus the stock "damper" that has a rubber collar built in.
-Bill

longassname · #**294** 10-30-2005, 07:23 PM

Geezus Bill, this isn't the space shuttle. I don't have qualification systems here.

Quote:

Originally Posted by SVXRide

Michael,
Probably a little of both....there are going to be tolerances inherent to your lathe just like their are tolerances inherent to the set up that Subaru's supplier had to produce the stock harmonic balancer...just curious as to what you believe your lathe will provide (ie. concentric to within .001?). I'm also curious - and this has been a discussion topic for a while on this site - what you think about the long term effects of having a solid crank pully versus the stock "damper" that has a rubber collar built in.
-Bill

SVXRide · #**295** 10-30-2005, 07:48 PM

Quote:

Originally Posted by longassname

Geezus Bill, this isn't the space shuttle. I don't have qualification systems here.

What? No in-house metrology set up?

-Bill
p.s. anyway I can order the 2v5 chip now without waiting for your web site to come back up?

NikFu S. · #**296** 10-30-2005, 09:53 PM

Well it looks pretty damn circular to me.

longassname · #**297** 10-30-2005, 10:16 PM

Quote:

Originally Posted by SVXRide

What? No in-house metrology set up?

-Bill
p.s. anyway I can order the 2v5 chip now without waiting for your web site to come back up?

I haven't made it yet so just hold up. Who knows maybe power will be back by then.

longassname · #**298** 11-03-2005, 04:57 PM

We have power back at the office now so the webserver is back online. I'm working on the rest of the crank pulleys now. I have the blanks cut, faced, turned, and the grooves for the vribs cut in.

SVXRide · #**299** 11-03-2005, 05:47 PM

Michael,
Nice! Three questions:

1. Have you thought of offering a s/c kit in which the s/c bolts to the top of the intake (yes, I realize this would require a modified hood, but then we've already got a stock FG hood available, so I don't think it would be a big deal to have it modified ala the Stillen 350z hood)?

2. When should I wait until to order the 2v5 chip? (Please say I'll be able to get it before the 20th of this month!)

3. Just how much FaSTar will the 2v5 chip be than the 2v4? (you reading this, J-man

)

-Bill

longassname · #**300** 11-03-2005, 06:18 PM

1) no
2) I'll get to it soon. I don't have an exact date for you.
3) it won't be any different except for at idle

Quote:

Originally Posted by SVXRide

Michael,
Nice! Three questions:

1. Have you thought of offering a s/c kit in which the s/c bolts to the top of the intake (yes, I realize this would require a modified hood, but then we've already got a stock FG hood available, so I don't think it would be a big deal to have it modified ala the Stillen 350z hood)?

2. When should I wait until to order the 2v5 chip? (Please say I'll be able to get it before the 20th of this month!)

3. Just how much FaSTar will the 2v5 chip be than the 2v4? (you reading this, J-man

)

-Bill