Short Belt Length

ThreeHonks302 · March 21st, 2008, 07:34 PM

I am removing both my A/C and Smog Pump. I will be using the a/c eliminator kit from Ford Racing that relocates the power steering pump to where the a/c compressor was. I will also be using my stock pullies. What is the correct belt length that I need. I have seen the diagram that suggests a 70.5" belt for car with underdrive pullies, but what length will I need since I am using my stock pullies?

ThreeHonks302 · March 22nd, 2008, 09:22 PM

Help??

dag545 · March 22nd, 2008, 09:33 PM

Originally Posted by ThreeHonks302

I am removing both my A/C and Smog Pump. I will be using the a/c eliminator kit from Ford Racing that relocates the power steering pump to where the a/c compressor was. I will also be using my stock pullies. What is the correct belt length that I need. I have seen the diagram that suggests a 70.5" belt for car with underdrive pullies, but what length will I need since I am using my stock pullies?

Tie a string around the pulleys as if a belt was going around it. Then mark the string, that will give you the correct length that your belt needs to be. Then take it up to the auto parts store.

91cobra5.0 · March 22nd, 2008, 09:52 PM

its prbly going to be around 85, but if it suggests a 70 then........ try the 70

Black Five 0h · March 22nd, 2008, 10:12 PM

it doesnt suggest a 70 for his car he was saying with ud pullies but i thought ud pullies were bigger making accesories spin less meaning less power taken from accesories

HMUSN · March 22nd, 2008, 10:13 PM

no UD pulleys are smaller than reg pulleys.
makes for quicker revs.

Black Five 0h · March 23rd, 2008, 02:40 AM

thats what i thought in the first place but then i heard someone say the opposite

ThreeHonks302 · March 23rd, 2008, 10:17 AM

yea the underdrives are smaller, but I will be running the stock pullies... so i know that the 70.5" belt will be slightly short, I know it will be at least 71" but I want to get it right the first time... I'll have to measure it with a string though...

jrh_1980 · March 23rd, 2008, 12:19 PM

I have the same thing and the belt i got was 72.5 inches

sniperrider · March 23rd, 2008, 08:22 PM

i have ac and smog delete and reloated p/s pump on march underdrive pulleys and i run a 68 1/2 belt

ThreeHonks302 · March 23rd, 2008, 09:00 PM

thanks everyone... by the measurement seen so far it looks like they vary a bit. It looks like i'll be best off to just measure it with a string. How do i know if the belt is too short otr long though, i want to do this right the first time

sniperrider · March 23rd, 2008, 09:55 PM

take the string in with you and hope you got close....otherwise take the belt back and swap it, thats what i did.....its good all you have to do is pull the tensioner...makes things like this easy.....just double check your pattern your running while measuring

91cobra5.0 · March 24th, 2008, 12:15 AM

u guys sure about the pullys being smaller? i started a topic about it were i was told otherwise

underdrive pullys?

Iwannagofast · March 24th, 2008, 01:53 AM

if they are smaller then they will have a smaller circumference which means it will take a less length of belt to turn the accessory one turn therefore it will turn more turns with less belt

Rustbelt · March 24th, 2008, 04:29 AM

found this:

hope it helps

91cobra5.0 · March 24th, 2008, 11:30 AM

can i run that red 84.5 config on the bottom right with a 85 belt?

Iwannagofast · March 24th, 2008, 05:38 PM

the red one is 70.5"

91cobra5.0 · March 24th, 2008, 05:46 PM

Oh

Iwannagofast · March 24th, 2008, 06:10 PM

and if your wanting to do one of those setups then i would use/or at least try first the length that is listed......and youll know the length is right if the tensioner is in the operating range

ThreeHonks302 · March 24th, 2008, 07:49 PM

I found that same belt diagram, but i found the origional; one and it said that it is for underdrive pullies (which are smaller) so I figure my belt needs to be at least 71" (since I will be running stock pullies)

March 21st, 2008, 07:34 PM	#1
ThreeHonks302 Regular Trans Am WS6 Join Date: Jan 2008 Location: Michigan Posts: 288 iTrader: 0 reviews	Short Belt Length I am removing both my A/C and Smog Pump. I will be using the a/c eliminator kit from Ford Racing that relocates the power steering pump to where the a/c compressor was. I will also be using my stock pullies. What is the correct belt length that I need. I have seen the diagram that suggests a 70.5" belt for car with underdrive pullies, but what length will I need since I am using my stock pullies?

March 22nd, 2008, 09:52 PM	#4
91cobra5.0 Hardcore Enthusiast 94 GT Join Date: Jan 2008 Location: Bay Area, Ca Posts: 2,055 iTrader: 0 reviews	its prbly going to be around 85, but if it suggests a 70 then........ try the 70 __________________ 94 GT - Deep Forest Green Off road X, flowmaster single chambers, typhoon intake, hurst short throw, CAI, eibach sportlines, 315s, foxbody short block

March 22nd, 2008, 10:12 PM	#5
Black Five 0h Enthusiast 02 Mustang GT Cant wait to find out Join Date: Mar 2007 Location: Connecticut Posts: 567 iTrader: 1 reviews	it doesnt suggest a 70 for his car he was saying with ud pullies but i thought ud pullies were bigger making accesories spin less meaning less power taken from accesories __________________ 02 Mustang GT "We build it up, run it hard, we know whats breaking and we enjoy it breaking, we dump money into it, we re-build it stronger, run it harder in anticipation of it breaking again. We are sick individuals." Last edited by Black Five 0h; March 22nd, 2008 at 10:12 PM. Reason: therefor bigger than a 70

March 22nd, 2008, 10:13 PM	#6
HMUSN Doc 1986 SVO Join Date: Nov 2006 Posts: 36,836 iTrader: 9 reviews	no UD pulleys are smaller than reg pulleys. makes for quicker revs. __________________

March 23rd, 2008, 02:40 AM	#7
Black Five 0h Enthusiast 02 Mustang GT Cant wait to find out Join Date: Mar 2007 Location: Connecticut Posts: 567 iTrader: 1 reviews	thats what i thought in the first place but then i heard someone say the opposite __________________ 02 Mustang GT "We build it up, run it hard, we know whats breaking and we enjoy it breaking, we dump money into it, we re-build it stronger, run it harder in anticipation of it breaking again. We are sick individuals."

March 22nd, 2008, 09:22 PM	#2
ThreeHonks302 Regular Trans Am WS6 Join Date: Jan 2008 Location: Michigan Posts: 288 iTrader: 0 reviews	Help??

March 23rd, 2008, 10:17 AM	#8
ThreeHonks302 Regular Trans Am WS6 Join Date: Jan 2008 Location: Michigan Posts: 288 iTrader: 0 reviews	yea the underdrives are smaller, but I will be running the stock pullies... so i know that the 70.5" belt will be slightly short, I know it will be at least 71" but I want to get it right the first time... I'll have to measure it with a string though...

March 23rd, 2008, 12:19 PM	#9
jrh_1980 Regular 89 Mustang LX 7.90@90mph 8th Join Date: Feb 2008 Location: Macomb, Illinois Posts: 151 iTrader: 1 reviews	I have the same thing and the belt i got was 72.5 inches

March 23rd, 2008, 08:22 PM	#10
sniperrider Regular Join Date: Apr 2007 Location: olympia washington Posts: 396 iTrader: 0 reviews	i have ac and smog delete and reloated p/s pump on march underdrive pulleys and i run a 68 1/2 belt __________________ 90 lx hatch

March 23rd, 2008, 09:00 PM	#11
ThreeHonks302 Regular Trans Am WS6 Join Date: Jan 2008 Location: Michigan Posts: 288 iTrader: 0 reviews	thanks everyone... by the measurement seen so far it looks like they vary a bit. It looks like i'll be best off to just measure it with a string. How do i know if the belt is too short otr long though, i want to do this right the first time

March 23rd, 2008, 09:55 PM	#12
sniperrider Regular Join Date: Apr 2007 Location: olympia washington Posts: 396 iTrader: 0 reviews	take the string in with you and hope you got close....otherwise take the belt back and swap it, thats what i did.....its good all you have to do is pull the tensioner...makes things like this easy.....just double check your pattern your running while measuring __________________ 90 lx hatch

March 24th, 2008, 12:15 AM	#13
91cobra5.0 Hardcore Enthusiast 94 GT Join Date: Jan 2008 Location: Bay Area, Ca Posts: 2,055 iTrader: 0 reviews	u guys sure about the pullys being smaller? i started a topic about it were i was told otherwise underdrive pullys? __________________ 94 GT - Deep Forest Green Off road X, flowmaster single chambers, typhoon intake, hurst short throw, CAI, eibach sportlines, 315s, foxbody short block

March 24th, 2008, 04:29 AM	#15
Rustbelt Regular Join Date: Mar 2007 Posts: 245 iTrader: 0 reviews	found this: hope it helps

March 24th, 2008, 11:30 AM	#16
91cobra5.0 Hardcore Enthusiast 94 GT Join Date: Jan 2008 Location: Bay Area, Ca Posts: 2,055 iTrader: 0 reviews	can i run that red 84.5 config on the bottom right with a 85 belt? __________________ 94 GT - Deep Forest Green Off road X, flowmaster single chambers, typhoon intake, hurst short throw, CAI, eibach sportlines, 315s, foxbody short block

March 24th, 2008, 05:46 PM	#18
91cobra5.0 Hardcore Enthusiast 94 GT Join Date: Jan 2008 Location: Bay Area, Ca Posts: 2,055 iTrader: 0 reviews	Oh __________________ 94 GT - Deep Forest Green Off road X, flowmaster single chambers, typhoon intake, hurst short throw, CAI, eibach sportlines, 315s, foxbody short block

March 24th, 2008, 07:49 PM	#20
ThreeHonks302 Regular Trans Am WS6 Join Date: Jan 2008 Location: Michigan Posts: 288 iTrader: 0 reviews	I found that same belt diagram, but i found the origional; one and it said that it is for underdrive pullies (which are smaller) so I figure my belt needs to be at least 71" (since I will be running stock pullies)

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