Belt Length Calculator

To determine the number of teeth on the belt required you will have to know four bits of information:

  1. Number of teeth on the vacuum pump pulley.
  2. Number of teeth on the crankshaft/drive pulley.
  3. The center distance between the vacuum pump shaft and the crankshaft with the pump slid or rotated as close to the crankshaft/drive shaft center as the slot will allow.
  4. The center distance between the vacuum pump shaft and the crankshaft with the pump slid or rotated as far away from the crankshaft/drive shaft center as the slot will allow.

Once you have these bits of information and entered them in the calculator there will be 3 outputs:

  1. The minimum number of teeth on the belt.
  2. The maximum number of teeth on the belt.
  3. The Center of Adjustment. Which is the average of these two numbers.

The Center of Adjustment should place the pump in a position where the belt can be tensioned or removed without bottoming out the bolts in the bracket slots. Use the number of teeth displayed in the Center of Adjustment to search for a matching belt. There are a limited number of belt lengths/teeth available. The number of teeth in the Center of Adjustment may not be available, in this case you will have to go up or down one tooth to fined the belt available.

Input





(in inches)


(in inches)

Output




Belt Manufacturers

Below are links to our recommended belt manufacturers.

Beidler's Belts http://www.biedlers-belts.com/synchronous-belts/powergrip-timing-belt/3-8-pitch-0-375-l-1-2-wide.html?limit=50
Graingers
McMaster Carr
Motion Industries
MSC Direct
Stock Drive / Sterling Products https://www.sdp-si.com/

Documents

Name Description
BELTS AVAILABLE FROM STOCK DRIVE/STERLING LIST OF BELT LENGTHS AVAILABLE
INTAKE + EXHAUST TANK INSTRUCTIONS INTAKE + EXHAUST TANK INSTRUCTIONS
MOUNTAIN MOTOR PUMP INSTRUCTIONS MOUNTAIN MOTOR PUMP INSTRUCTIONS
STANDARD PULLEY RATIOS STANDARD PULLEY RATIOS
STANDARD PUMP INSTRUCTIONS STANDARD PUMP INSTRUCTIONS
STR.04.01.004 Sportsman Vacuum Pump Mounting Bracket STR.04.01.004 Sportsman Vacuum Pump Mounting Bracket
STR.04.03.000 SPORTSMAN PUMP SPORTSMAN PUMP INSTRUCTIONS
STR.04.07.000 MANDREL INSTRUCTIONS STR.04.07.000 MANDREL INSTRUCTIONS
STR.05.01.004 Sportsman Vacuum Pump Mounting Bracket STR.05.01.004 Sportsman Vacuum Pump Mounting Bracket
STR.06.11.001 BAFFLE INSTRUCTIONS STR.06.11.001 BAFFLE INSTRUCTIONS
VACUUM REGULATOR ADJUSTMENT VACUUM REGULATOR ADJUSTMENT
VANE INSTALLATION VANE INSTALLATION

3D Models

Below are the 3D models of our products. We provide several formats for each model to suit your needs. To download, click the download link next to the desired model. You will be asked to fill out a brief form telling us a little bit about yourself before you will be given the link.

Part File Format File Size Download
-12 AN Female Regulator (AN fitting not included) STEP 3.16 MB Download
-12 AN Female Regulator (AN fitting not included) IGES 5.76 MB Download
-12 AN Female Regulator (AN fitting not included) PKG 0.45 MB Download
-12 AN Male Regulator PKG 0.18 MB Download
24 Tooth Composite Pump Pulley IGES 2.24 MB Download
24 Tooth Composite Pump Pulley STEP 0.65 MB Download
24 Tooth Composite Pump Pulley PKG 0.28 MB Download
36 Tooth Aluminum Pump Pulley PKG 0.7 MB Download
36 Tooth Aluminum Pump Pulley IGES 4.66 MB Download
36 Tooth Composite Pump Pulley STEP 0.95 MB Download
36 Tooth Composite Pump Pulley IGES 0.95 MB Download
36 Tooth Composite Pump Pulley PKG 0.42 MB Download
40 Tooth Composite Pump Pulley STEP 0.87 MB Download
40 Tooth Composite Pump Pulley IGES 3.07 MB Download
40 Tooth Composite Pump Pulley PKG 0.39 MB Download
Accessory Drive Mandrel With 5.2 PKG 0.8 MB Download
Accessory Drive Mandrel With 5.2 IGES 4.49 MB Download
Accessory Drive Mandrel With 5.2 STEP 1.42 MB Download
Intake + Exhaust Tank with -12AN Fittings STEP 0.6 MB Download
Intake + Exhaust Tank with -12AN Fittings IGES 1.69 MB Download
Intake + Exhaust Tank with -12AN Fittings PKG 0.44 MB Download
Mini Vacuum Pump PKG 0.9 MB Download
Mini Vacuum Pump IGES 2.25 MB Download
Mini Vacuum Pump STEP 1.15 MB Download
Mountain Motor Vacuum Pump PKG 0.99 MB Download
Mountain Motor Vacuum Pump STEP 0.61 MB Download
Mountain Motor Vacuum Pump IGES 1.69 MB Download
Standard Vacuum Pump PKG 1.75 MB Download
Standard Vacuum Pump STEP 2.51 MB Download
Standard Vacuum Pump IGES 5.44 MB Download