SC Belts

2112 said:

Yes you did but you mentioned possibly making those sweet fuel rails available to the rest of us.

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Oh sure, just call Shawn Fischer. He has everything saved in CAD. He can make as many as needed. www.fischermotorsports.com

2112 said:

Mark did you fabricate these to accommodate higher flow and bigger injectors?

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Yes and no... we had already installed 1000cc injectors on the car with the original fuel rails. The OEM rails are basically hollow, so they have tremendous flow capabilities but I doubt they would handle much more pressure than the stock ECU targets. They are constructed strangely... basically a thin flat piece of metal that is bent to form a box and then it looked like they were spot welded together. Shawn's guess was that they were made to absorb some of the back-pressure vibration associated with injectors opening and closing. When we went to add a return line for our new fuel system, the OEM fuel did not respond well to the heat associated with the TIG welder. The OEM rails were weakened enough that we saw pinhole leaks the first time we pressure tested. After that we looked for a good replacement option and nothing seemed to fit the bill so we made these.

BTW - I have a set of GT fuel rails that would work great with a turbo system for sale (cheap). The SC gets in the way of the return line with these.

OzGT said:

My tuner has on a couple of occasions tried to cut down the 12 ribs Gates belts to emulate the job Whipple does with them. He even made a special tool to do it with however on both occasions the belts have not held up and ended up fraying, so we're back to sourcing the Whipple versions.

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Did you guys use the Green Stripe or the HD belt? Did it come apart quickly or did it take a few hundred miles. Shawn said he has used a local company to cut down belts on several occasions without a problem. I believe he said they were using the belts for timing tho so this may require more strength. I don't know. At any rate, the Gates HD version of my belt was about $50-$60 and the shop charged around $10... with shipping I was all in for less than $100. Longevity is a critical component tho. I'll report back if I have problems.

I am happy to report that the Gates HD (heavy duty) belts, that we had cut down locally seem to be holding up very well. The one I installed has about 2500 miles on it so far. I have given it several close inspections and it does not appear to have any issues with the cut. The HD version is not to stiff, no squeaks or problems making the turns. The belts is wearing smoothly on both sides, as expected. If anyone would like me to have this shop cut down some more, just let me know. I think it can be done on a per/belt basis for around $80-90 total cost (purchase+cut+shipping+1 cigar commission) depending on where I needed to ship it from here.

It saves about $100 over the Whipple belt, but I wasn't trying to cut them out of the action. In fact i felt kind of bad but the boys at Whipple didn't seem the least bit offended. I think they'd rather sell meat grinders, than rubber bands. I cant say enough about their customer support and service after the sale. I really just wanted to try the HD version and Whipple doesn't offer it. I have been told by several local guys that he "green" belt sticks better and lasts longer. It also looks kind of cool (something different anyway). That is all, carry on.

How many do you want?

DeMopuar said:

Fubar,

Can you help me get a couple of HD belts cut down to the proper width? I have a 3.5" pulley on a 4.0L Whipple. What's the easiest way to get this done for me?

Thanks, Mark

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Is that the 19lbs pulley? If so, I have one in my garage. If your in a hurry I can send it out tomorrow. If not, I will orders couple for you tomorrow, it should take about two week to get em, cut em and ship em.

I hate to make things complicated but I want to make sure I get you the correct belt length. Whipple lists this for the 3.4 SC:
SCP-GT400 4.00" W200ax SC pulley/15psi
SCP-GT375 3.75" W200ax SC pulley/17psi
SCP-GT350 3.50" W200ax SC pulley/19psi
SCP-GT325 3.25" W200ax SC pulley/21psi
SCP-GT300 3.00" W200ax SC pulley/23psi

Basically you can bump up the psi one notch for the 4.0l. In theory, like this:
SCP-GT400 4.00" W210ax SC pulley/17psi
SCP-GT375 3.75" W210ax SC pulley/19psi
SCP-GT350 3.50" W210ax SC pulley/21psi
SCP-GT325 3.25" W210ax SC pulley/23psi
SCP-GT300 3.00" W210ax SC pulley/25psi

This is how I believe it was explained to me. I just want to double check that you have the 3.75" / 19 lbs pulley. You may have the 3.5" pulley but I think you would be making more boost. Whipple said the belt sizes are still constant from the 3.4 to the 4.0

If anyone has better information, feel free to correct my statements. I can be wrong from tie to time... just ask my wife.

I'm adding this just to make future research on the topic easier:
Whipple Part#......Actual length...........Pulley Size (3.4 or 4.0)
WB-B2210-10.......2210mm/87"..........(2.70, 2.87 pulley)
WB-B2260-10.......2260mm/89"..........(3.00, 3.25 pulley)
WB-B2300-10.......2300mm/90.5".......(3.50, 3.75 pulley)
WB-B2310-10.......2310mm/91"..........(3.75, 4.00 pulley)
WB-B2345-10.......2345mm/92.3".......(4.00, 4.25 pulley)

Gates parts #........length.................
K12-0864-HD........86 7/8"....2208mm
K12-0866-HD........87 1/4"....2215mm
K12-0870-HD........87 5/8"....2225mm
K12-0872-HD........87 3/4"....2230mm
K12-0878-HD........88 3/8"....2245mm
K12-0891-HD........89 5/8"....2278mm
K12-0895-HD........90 1/8"....2289mm
K12-0901-HD........90 5/8"....2301mm
K12-0903-HD........90 7/8"....2308mm (Fubar/3.75")
K12-0910-HD........91 5/8"....2326mm

I ordered a few based on 19lbs pulley. Should have them here in a few days. Cutting wont take long and them I'll shoot 'em out to you.

btw, you should be able to shine a light thru the back glass and see the pulley size inscribed on the pulley.

Okay, I get whatever size whipple recommends.

Okay, I laid out the different sizes that Whipple recommends and also the lengths that Gates actually manufactures. I have to admit that I'm a little frustrated that none of the belt sizes are a perfect match, even tho Whipple says they use the Gates belts? This leaves you with a decision, do you get a belt that is a little bigger or a little smaller? I used the 90 7/8" belt on my 3.75" pulley. Originally thought it was a tad to long due to that fact that the first time I started the motor I noticed a little pulley chirp that turned into something awful as the motor warmed up. It sounded like a slipping belt but I couldn't tighten it down any more. SO, I loosened it. Oddly enough, that fixed the initial chirp and subsequent squealing.

In short, I would recommend going on the long side. As such, I ordered the 91 5/8" for you Mark.

See this post for the data I collected:
http://www.fordgtforum.com/forums/showthread.php?20951-SC-Belts&p=271098&viewfull=1#post271098