what is the smallest 8 rib pulley you have used without slipping? - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 29 Old 11-27-2012, 04:35 PM Thread Starter
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what is the smallest 8 rib pulley you have used without slipping?

what is the smallest 8 rib pulley you have used without slipping? what tricks did you use t o help?

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post #2 of 29 Old 11-27-2012, 06:29 PM
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I will be using a 2.75" 8 rib soon,going to get it coated in a carbinite type textured coating to help eliminate slip.

Would have preferred an 8" crank pulley tbh,but difficult/costly for a 94-95.


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post #3 of 29 Old 11-27-2012, 06:30 PM
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On a s-trim a 2.95 , on a t-trim a 3.12. That was the smallest I have tried on either.

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post #4 of 29 Old 11-27-2012, 11:13 PM Thread Starter
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anybody go under 2.80 with success?
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post #5 of 29 Old 11-28-2012, 12:12 AM
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anything under a 2.95 and an 8 rib is gonna slip no way around it.If at all possible its
best to go with a larger crank pulley and stay with a larger blower pulley.

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post #6 of 29 Old 11-28-2012, 09:25 AM
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I've used a 2.75 with an 8" lower on my YSI. Get a Kurgan brace if you're going to try it, belt needs to be beyond tight!

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post #7 of 29 Old 11-28-2012, 01:07 PM
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Quote:
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what is the smallest 8 rib pulley you have used without slipping? what tricks did you use t o help?
ALL serpentine belts have some slip. Obviously the larger the crank pulley(8") & the greater amount of ribs(10)the less slip U have. I've ran 2.50 SC pulley, 8" crank w/10 ribs and had good success!! Doesn't get ANY better than that IMHO, unless Cogs..
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post #8 of 29 Old 11-28-2012, 03:54 PM Thread Starter
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what does the kurgan brace do exactly? does it help keep the belt super tight? it looks like it really hard to adjust as it is squeezed in there? how do you adjust it?
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post #9 of 29 Old 11-28-2012, 03:55 PM Thread Starter
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i laso heard that 10 rib belts are harder to find than 8 rib and that the options are not as good- is this true?
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post #10 of 29 Old 11-28-2012, 06:19 PM
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Kurgans brace lets you get the belt as tight as you want without flewing the blower. Itr probibly takes some pressure off of the crank also. It connects the upper pulley to the lower pulley with a bar basically.


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post #11 of 29 Old 11-29-2012, 07:07 AM
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this is an open ended question... the reason is the bigger blowers, like the ysi etc, require more HP to turn at higher RPM... that being said, more tension or a larger pulley is required... also, it depends on your tensioning system! You can get away with a much smaller pulley on a foxbody then a mod motor because the mod motor uses the factory tensioner with a spring... if you give more details, i can give you my experience..

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post #12 of 29 Old 11-29-2012, 09:02 AM
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Quote:
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Kurgans brace lets you get the belt as tight as you want without flewing the blower. Itr probibly takes some pressure off of the crank also. It connects the upper pulley to the lower pulley with a bar basically.
Any link to see/purchase this brace? I tried to find it on the Kurgan site but could not.

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post #13 of 29 Old 11-29-2012, 09:47 AM
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Any link to see/purchase this brace? I tried to find it on the Kurgan site but could not.

Scott
https://forums.corral.net/forums/supe...wer-brace.html

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post #14 of 29 Old 11-29-2012, 10:56 AM
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8/2.75 seeing 20+ psi with a ysi KMS tuned.......seems to hold pretty steady with what i can see but like others have said, tighten the snot out of it.

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post #15 of 29 Old 11-29-2012, 01:33 PM Thread Starter
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Bob- set up is a 89 lx with a si trim. 8 inch lower presently.
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post #16 of 29 Old 11-29-2012, 03:24 PM
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not to hijack but i was planning on running the stock 6.75 crank pulley with a 2.75 blower pulley on my s-trim-is it going to slip bad?
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post #17 of 29 Old 11-29-2012, 04:13 PM Thread Starter
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i would go to 8 inch crank to start
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post #18 of 29 Old 12-03-2012, 12:42 AM
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2.85" Traction improved pulley, and the largest crank damper you can fit. 7.50" (15% OD). You can fit this fairly easy with minimal grinding of the crank trigger boss. You can also still use your regular water pump pullley.

7.75" (18% OD) will require an electric water pump, and serious modification to the timing cover.

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post #19 of 29 Old 12-10-2012, 12:45 PM
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Ran all the way down to a 2.5 pulley. Ran the gatorback 8 rib on all. Below 2.75 will slip. 2.95 pulley had same boost as 2.5 and 2.75 pulley I assume it just slips. Had plenty of belt wrap and cranked extremely tight.

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post #20 of 29 Old 12-25-2013, 05:16 PM
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I have done 2.80" and 7.00" with a S-trim with no problems but that was a 10 rib setup and no brace on a Foxbody, now I have a 95 with a 8 rib 6.87" crank pulley, I know a 2.95" blower pulley will work without slipping but could I use a 2.80" or 2.85" without a brace and no slipping?

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post #21 of 29 Old 12-28-2013, 08:43 PM
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I have done 2.80" and 7.00" with a S-trim with no problems but that was a 10 rib setup and no brace on a Foxbody, now I have a 95 with a 8 rib 6.87" crank pulley, I know a 2.95" blower pulley will work without slipping but could I use a 2.80" or 2.85" without a brace and no slipping?
Anybody?

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post #22 of 29 Old 12-28-2013, 09:53 PM
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Anybody?
you're always gonna get some slip. No reason not to try it. Read my earlier post.
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post #23 of 29 Old 12-28-2013, 11:10 PM
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The first Vortech supercharged car/ first supercharged car I ever worked on or tuned, had a pulley that I measured at 2.48". It would shred belts, a belt would only last about three passes, before it broke. After two passes you could see daylight through the belt. After a lot of experimenting, making a blower brace, then finally adding a idler pulley. The idler pulley fixed the problem, no more belt slippage. The car was pretty wicked once the belt problem was fixed.

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post #24 of 29 Old 05-26-2019, 11:18 AM
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I'd like to revive this thread lol I wonder if there has been any new ideas and experiences ?
I am just moving from my T Trim to a YSI hoping for 750whp on E85 , E98 barrel fuel backed off so it's super clear and clean
I have a 10% overdrive Crank an underdrive Alternator and underdrive water pump pulley. I ran a 2.95 on my T Trim with honestly no belt slip. Some say the YSi need more energy /torque to spin the unit ? Any more feed back or results running a 2.75 or 2.8 blower pulley with a 10% crank with their ysi ?
Belt sizes ? And brand ....
Thanks in advance
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post #25 of 29 Old 05-26-2019, 02:07 PM
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Not a ysi, but I run a 2.75 on my whipple - it's got heavy rotors. In my experience, the tensioner is more important for dealing with belt slip than the pulley. With a manual tensioner, I had to run more than twice as much belt tension as I do with my custom-built spring loaded tensioner. Two other things: the fleetrunner (green) and newer blue blower belts are the only way to go (forget gatorback - they're like rubber bands; and much less robust), and most pulley treatments (cross grooves are what I've tried) don't do much for slippage and just wear belts out faster.


It's all in the tensioner.

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post #26 of 29 Old 05-26-2019, 02:21 PM
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Quote:
Originally Posted by AlexLTDLX View Post
Not a ysi, but I run a 2.75 on my whipple - it's got heavy rotors. In my experience, the tensioner is more important for dealing with belt slip than the pulley. With a manual tensioner, I had to run more than twice as much belt tension as I do with my custom-built spring loaded tensioner. Two other things: the fleetrunner (green) and newer blue blower belts are the only way to go (forget gatorback - they're like rubber bands; and much less robust), and most pulley treatments (cross grooves are what I've tried) don't do much for slippage and just wear belts out faster.


It's all in the tensioner.
Dude, I love the stuff you come up with. Seriously, anything you post, I’m reading. Just had to say...

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post #27 of 29 Old 05-26-2019, 02:46 PM
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Wow, thanks. I'm honored. But I do make TERRIBLE life choices. Car stuff, not so much...

BTW, I'm not really going nuts posting stuff on the Corral (or any forum for that matter) any more. The Corral and Yellowbullet both hosed my threads with pictures - they no longer "trust" outside FTP servers for hosting images. I'm putting stuff up on my youtube channel instead. In fact, I'm making a new video today.

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post #28 of 29 Old 05-26-2019, 02:55 PM
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Thanks for the advice on belts and the tensioner. I swapped my timing cover and vortech mounting bracket out to accept the 3 bolt THUMP RRR Tensioner when I did my 8 rib upgrade. and that did away with slippage I had years ago with the 2.95 6 ribbed . Dyno visits are costly from where I live as are belts and pullies shipped to Canada, so I am just trying to make some decisions before I hit the rollers. Thanks guys
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post #29 of 29 Old 06-14-2019, 09:12 AM
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Alright corral forum friends. I have the Ysi bolted up on my 99 timing cover with the Thump RRR Racing tensioner. Man that tensioner is stiff &#x1f609; I ditched the 2.95 8 rib for.a 2.7. I installed the Metco Overdrive alternator pulley (really large) and with the 10% Innovators west crank pulley I was able to walk the KO81145 belt on that I was using with factory alternator pulley and the 2.95. But now the belt is just a bit tighter &#x1f642; but the tensioner still looks in good range gear for added tension on the belt. I am due to hit the rollers a week from today and I will keep you all posted with updates .
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