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High RPM and V-belts #2958983 08/30/21 11:51 AM 08/30/21 11:51 AM
Joined: Jun 2016 Posts: 903 Washington H hemienvy OP super stock
hemienvy OP super stock H Joined: Jun 2016 Posts: 903 Washington	Big block application, just driving alternator and water pump. Street driven car, I want to keep the alternator and W/P belt driven. Engine will have 7000~~7200 RPM capability. At the moment I have a simple OE V-belt setup. I'm just looking ahead to any potential problems, like maybe some belts are better than others ? Or some different pulley system ? Curious about using all Gilmer belts / pulleys. If the pulleys are in good alignment, is that all I really need to be concerned with ?

Re: High RPM and V-belts [Re: hemienvy] #2959029 08/30/21 01:54 PM 08/30/21 01:54 PM
Joined: Sep 2003 Posts: 19,307 north of coder moparx "Butt Crack Bob"
moparx "Butt Crack Bob" Joined: Sep 2003 Posts: 19,307 north of coder	if you are staying with v belts, maybe a simple belt "retainer" made from 1/2" round stock with some flat stock welded to the end, then bolted to the alternator and water pump approximately 1/8" above the pulley may help retain the belts when they stretch at high rpm. i have seen this simple idea on several applications. it seems to do the job, so i have stored this idea if i ever need to use it.

Re: High RPM and V-belts [Re: moparx] #2959059 08/30/21 03:21 PM 08/30/21 03:21 PM
Joined: Jun 2006 Posts: 5,159 CT GTX MATT master
GTX MATT master Joined: Jun 2006 Posts: 5,159 CT	Run the shortest, skinniest belt you can. Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street

Re: High RPM and V-belts [Re: GTX MATT] #2959067 08/30/21 03:35 PM 08/30/21 03:35 PM
Joined: Jun 2008 Posts: 3,916 usa L lewtot184 master
lewtot184 master L Joined: Jun 2008 Posts: 3,916 usa	i've used this idea for decades.

Re: High RPM and V-belts [Re: lewtot184] #2959082 08/30/21 04:37 PM 08/30/21 04:37 PM
Joined: May 2005 Posts: 1,030 ohio 6 67mprfan super stock
67mprfan super stock 6 Joined: May 2005 Posts: 1,030 ohio	Following this topic because I'm actually having a issue with mine flying off, 71 demon stock stroke 440/indy ez-1 running 10.10 @ 132.14 mph in the 1/4 and 6.36 @ 107.46 mph in the 1/8 not in the same weekend but It did it then I sold it. 67 Belvedere that worked it's way in the 10's

Re: High RPM and V-belts [Re: hemienvy] #2959085 08/30/21 04:58 PM 08/30/21 04:58 PM
Joined: Feb 2005 Posts: 4,310 Prospect, PA BSB67 master
BSB67 master Joined: Feb 2005 Posts: 4,310 Prospect, PA	I've not had any problems with the factory pulleys and local part store replacement belts staying on at 7000.

Re: High RPM and V-belts [Re: BSB67] #2959094 08/30/21 05:36 PM 08/30/21 05:36 PM
Joined: Feb 2015 Posts: 162 Chicago-area Illinois 4mopower member
4mopower member Joined: Feb 2015 Posts: 162 Chicago-area Illinois	I just talked to Powermaster the other day about this for my own project, he said make sure it's straight and tight.

Re: High RPM and V-belts [Re: 4mopower] #2959101 08/30/21 05:48 PM 08/30/21 05:48 PM
Joined: Mar 2009 Posts: 2,457 Sydney,Australia tex013 top fuel
tex013 top fuel Joined: Mar 2009 Posts: 2,457 Sydney,Australia	i use March pulleys . Similar to Lew i have idler pulleys on the upper belt run , no drag and keep a slight tension as it helps wrap a little more on the alt/waterpump pulleys Tex New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive

Re: High RPM and V-belts [Re: tex013] #2959110 08/30/21 06:07 PM 08/30/21 06:07 PM
Joined: Mar 2003 Posts: 9,096 Rogue River, OR Jeremiah master
Jeremiah master Joined: Mar 2003 Posts: 9,096 Rogue River, OR	That is one thing that has never given me trouble. Running a quality alternator and water pump helps with bearing longevity because they do need to be a little on the toghter side. I have had good luck with Tuff Stuff and Powermaster alternators. Milodon used to be my go to water pump however the last batch I ordered were GMB inside of a Milodon box. I find it annoying that you cannot source a high quality as-cast water pump. It is almost easier to run an electric water pump. I look at the mechanical fan as a safety issue when working on an engine.

Re: High RPM and V-belts [Re: Jeremiah] #2959123 08/30/21 06:39 PM 08/30/21 06:39 PM
Joined: Jun 2016 Posts: 903 Washington H hemienvy OP super stock
hemienvy OP super stock H Joined: Jun 2016 Posts: 903 Washington	Jeremiah, what do you like for a water pump ? What RPM do you shift at ?

Re: High RPM and V-belts [Re: hemienvy] #2959134 08/30/21 06:55 PM 08/30/21 06:55 PM
Joined: Jan 2003 Posts: 30,989 Oregon A AndyF I Win
AndyF I Win A Joined: Jan 2003 Posts: 30,989 Oregon	If you have an electric fuel pump then you can go with a low mount alternator kit. The low mount kit drops the alternator down a few inches so the belt is much shorter. http://arengineering.com/products/low-mount-60a-kit-bb/

Re: High RPM and V-belts [Re: hemienvy] #2959135 08/30/21 06:57 PM 08/30/21 06:57 PM
Joined: Mar 2003 Posts: 9,096 Rogue River, OR Jeremiah master
Jeremiah master Joined: Mar 2003 Posts: 9,096 Rogue River, OR	I have stuff that shifts from 5800 to 7200. I use CVR 55 gpm electric pumps for a stock style replacement however my preference is an AR Engineering motor plate/water pimp adapters and a remote pump.

Re: High RPM and V-belts [Re: hemienvy] #2959208 08/30/21 09:36 PM 08/30/21 09:36 PM
Joined: Oct 2007 Posts: 472 Minnesota, USA humpty mopar
humpty mopar Joined: Oct 2007 Posts: 472 Minnesota, USA	V belts on my alternator and vacuum pump spinning to 8400 with no issues. Make sure the pulleys are aligned and the belts are tight and you should be good.

Re: High RPM and V-belts [Re: AndyF] #2959240 08/30/21 10:27 PM 08/30/21 10:27 PM
Joined: May 2005 Posts: 1,030 ohio 6 67mprfan super stock
67mprfan super stock 6 Joined: May 2005 Posts: 1,030 ohio	Originally Posted by AndyF If you have an electric fuel pump then you can go with a low mount alternator kit. The low mount kit drops the alternator down a few inches so the belt is much shorter. http://arengineering.com/products/low-mount-60a-kit-bb/ Andy I have that kit but still having issues with belt coming off. But I'm running the stock alternator 71 demon stock stroke 440/indy ez-1 running 10.10 @ 132.14 mph in the 1/4 and 6.36 @ 107.46 mph in the 1/8 not in the same weekend but It did it then I sold it. 67 Belvedere that worked it's way in the 10's

Re: High RPM and V-belts [Re: 4mopower] #2959322 08/31/21 08:42 AM 08/31/21 08:42 AM
Joined: Oct 2003 Posts: 11,684 W. Kentucky justinp61 I Live Here
justinp61 I Live Here Joined: Oct 2003 Posts: 11,684 W. Kentucky	Originally Posted by 4mopower I just talked to Powermaster the other day about this for my own project, he said make sure it's straight and tight. ^^This^^ My small block has a 5" pulley on the crank and has a Powermaster GM CS121 alternator. I've turned it 7800 and didn't throw the belt. I took a lot of time to ensure everything lined up well when I made the spacer for the crank pulley and the alternator brackets.

Re: High RPM and V-belts [Re: 67mprfan] #2959325 08/31/21 08:42 AM 08/31/21 08:42 AM
Joined: Jan 2003 Posts: 13,351 Marion, South Carolina [><] an8sec70cuda I Live Here
an8sec70cuda I Live Here Joined: Jan 2003 Posts: 13,351 Marion, South Carolina [><]	I've run a few different configurations w/ V belts consisting of stock size pulleys and smaller underdrive pulleys. All over 7k rpm and never had any issues w/ belts coming off. I think the biggest issue is making sure it's all aligned properly. CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax

Re: High RPM and V-belts [Re: lewtot184] #2959337 08/31/21 09:21 AM 08/31/21 09:21 AM
Joined: Jan 2003 Posts: 1,020 Andrews,In. U.S.of A. 6 67_Satellite super stock
67_Satellite super stock 6 Joined: Jan 2003 Posts: 1,020 Andrews,In. U.S.of A.	Originally Posted by lewtot184 i've used this idea for decades. Made one of these for the Satellite. I lowered the alt. 10'' for packaging reasons, and this stopped the belt throwing. Quick. cheap& reliable. Saw an episode of Graveyard Cars where they had an underhood go-pro camera mounted, and even the factory system showed lots of "whip" in the belts. Last edited by 67_Satellite; 08/31/21 09:23 AM.

Re: High RPM and V-belts [Re: 67_Satellite] #2959486 08/31/21 01:22 PM 08/31/21 01:22 PM
Joined: Jan 2003 Posts: 19,355 Las Vegas Al_Alguire I Live Here
Al_Alguire I Live Here Joined: Jan 2003 Posts: 19,355 Las Vegas	Keep the belt as short as possible and as stuff as you can and you wont have any issues. Low mount kits are great for that. The only belt i ever have an issue with the is AC belt on my Camaro but it is a MILE long and dont like anything over 7400 "I am not ashamed to confess I am ignorant of what I do not know." "It's never wrong to do the right thing"

Re: High RPM and V-belts [Re: 67_Satellite] #2959518 08/31/21 02:25 PM 08/31/21 02:25 PM
Joined: Jun 2008 Posts: 3,916 usa L lewtot184 master
lewtot184 master L Joined: Jun 2008 Posts: 3,916 usa	Originally Posted by 67_Satellite Originally Posted by lewtot184 i've used this idea for decades. Made one of these for the Satellite. I lowered the alt. 10'' for packaging reasons, and this stopped the belt throwing. Quick. cheap& reliable. Saw an episode of Graveyard Cars where they had an underhood go-pro camera mounted, and even the factory system showed lots of "whip" in the belts. i had an old drag racer show me that "gadget" about 1969. i ran a 4spd car and it would be unreliable belt wise approaching 6000rpm. been using them since. there's a reason the super stock wedges and hemis had deep groove pulleys.

Re: High RPM and V-belts [Re: lewtot184] #2959875 09/01/21 12:22 PM 09/01/21 12:22 PM
Joined: Sep 2003 Posts: 19,307 north of coder moparx "Butt Crack Bob"
moparx "Butt Crack Bob" Joined: Sep 2003 Posts: 19,307 north of coder	Originally Posted by lewtot184 Originally Posted by 67_Satellite Originally Posted by lewtot184 i've used this idea for decades. Made one of these for the Satellite. I lowered the alt. 10'' for packaging reasons, and this stopped the belt throwing. Quick. cheap& reliable. Saw an episode of Graveyard Cars where they had an underhood go-pro camera mounted, and even the factory system showed lots of "whip" in the belts. i had an old drag racer show me that "gadget" about 1969. i ran a 4spd car and it would be unreliable belt wise approaching 6000rpm. been using them since. there's a reason the super stock wedges and hemis had deep groove pulleys. that was exactly the idea i tried to explain. thanks for posting that picture Lew !

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