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Engine Pulley Ratio Table

The following table provides the crankshaft pulley to accessory pulley ratios. The crankshaft diameter is provided in millimeters and the ratios are already calculated for the accessory pulley. The crankshaft ratio will be entered a "1" in the PicoDiagnostic software followed by the ratio of the accessory.

Alternatively, the pulley diameters can be manually measured and entered as is. The PicoDiagnostic software will determine the ratios based on the diameter input.

The oil pump ratios are determined by the pulley diameter multiplied by the number of vanes in the oil pump. The water pump ratios are determined in the same way where the vane count is known.

Engine  Families  Model Year  Crankshaft Diameter (mm) 
Enter as 1 in Software		 Ratios 
  Clockwise From Crankshaft (Rear Plane First)   Clockwise From Crankshaft (Rear Plane First)  
Alternator  MGU  AC Compressor  Water Pump  Power Steering  Tensioner 1  Tensioner 2  Tensioner 3  Fan  Idler 1  Idler 2  Oil Pump (Not Belt Driven) 
1.4L Fire NA FF 2012- 135 2.62   1.34     2.03            
1.4L Fire Turbo PF, Abarth 2012- 135 2.62   1.22     2.03            
2.2/2.0L Fiat Diesel KL, MP, JL All 165 2.95   1.37     2.49       2.58    
2.0L GMET4 GA, GU 2016- 144.39 2.7   1.32 1.7   2.23       2.23    
2.0L GMET4 JL, KL, K8 2017- 144.39 2.7   1.32 1.7   2.23       2.23    
2.0L GMET4 eTorque JL 2019- 144.39   2.38 1.19 1.7   2.04/2.04 2.23          
2.0L GMET4 PHEV JL, WL 2020- 144.39   2.38   1.7   2.04/2.05            
2.0L GMET4 PHEV K8 2019- 144.39       1.7                
2.4L Tigershark PF, UF, KL 2013- 144.39 2.66   1.2 1.08   2.18       2.03    
2.4L Tigershark VM 2015- 144.39 2.66   1.3 1.08 1.12 2.18       2.03 2.18  
2.4L Tigershark MP 2017- 144.39 2.66                      
2.4L World Eng. MK, JS, JC 2009- 144.39 2.66   1.2 1.08 1.12 2.18       2.03 20.3  
2.8L VM RT 2005- 170.89 3.14   1.54   1.29 2.38       2.39    
2.8L VM JK 2012- 170.89 3.16   1.42   1.2 2.38     1.43 2.19 2.38  
3.0L VM DS 2013- 170.89 3.15   1.25 1.59 1.59 2.65       2.38 2.61  
3.0L VM WK, JL, JT All 170.89 3.15   1.25 1.59 1.59 2.65       2.61    
3.0L GMET6 SO WS 2023-   2.67   1.33 9.52   2.17       2.17   7.35
3.0L GMET6 HO WS 2023-   2.67   1.33 9.52   2.17       2.17   8.4
3.2L Pentastar KL 2014- 148.03 2.72   1.22 1.34   2.32       2.41 2.26 7
3.6L Pentastar JK 2012- 148.03 2.72   1.23 1.34   2.23       2.23 2.23 7
3.6L Pentastar DS, L-Bodies 2014- 148.03 2.72   1.23 1.34   2.08       2.26   7
3.6L Pentastar RT, JS, JC 2011- 148.03 2.71   1.22 1.34   2.08       2.25   7
3.6L Pentastar UF 2015- 148.03 2.72   1.22 1.34     2.32       2.41 2.26 7
3.6L Pentastar VF 2014- 148.03 2.72   1.22 1.34 1.25 2.08       2.26 2.23 7
3.6L Pentastar WK, WD 2011- 148.03 2.72   1.22 1.34   2.08       2.26   7
3.6L Upgrade JL, JT 2018- 148.03 2.73   1.22 1.34   2.24       2.24 2.24 8.05
3.6L Upgrade RU 2017- 148.03 2.72   1.22 1.34   2.32       2.41 2.26 8.05
3.6L Upgrade WK, WD, WL 2016- 148.03 2.73   1.23 1.34   2.08       2.27   8.05
3.6L Upgrade L-Bodies, DS, DT 2018- 148.03 2.72   1.23 1.34   2.08       2.26   8.05
3.6L Upgrade eTorque DT, JL 2019- 148.03   2.45 1.23 1.34   2.11 2.08 2.08   2.08   8.05
3.6L Pentastar PHEV RU 2016- 148.03       1.34   2.32       2.26   8.05
4.7L V8 DS 2013   2.75   1.26 1.30   2.26     1.3 2.32 2.51  
5.7L Hemi DD, DJ, DP, D2 2011- 158.81 2.75   1.26 11.7 1.3 2.23     1.3 2.23   10
5.7L Hemi DS, DT 2013- 158.81 2.77   1.26 11.7   2.23     1.3 2.23   10
5.7L Hemi LX, LA, LC, LD 2011- 158.81 2.8   1.26 13.5   2.23       2.23 2.43 10
5.7L Hemi WK, WD 2011 - 2014 158.81 2.8   1.31 13.5 1.3 2.23     1.3 2.23   10
5.7L Hemi WK, WD 2015- 158.81 2.8   1.31 13.5   2.23     1.3 2.23 2.43 10
5.7L Hemi eTorque DT 2019- 181.51 / 158.81   3.00 1.33 11.7   2.55 2.41         10
6.4L BGE DD, DJ, DP, D2 2014- 158.81 2.91   1.26 11.7 1.3 2.23     1.3 2.23   10
6.4L BGE (Dual Alt) DD, DJ, DP, D2 2014- 158.81 2.75 / 2.76   1.26 11.7 1.3 2.23     1.3 2.23   10
6.4L Apache     158.81 2.8   1.32 11.79   2.26       2.26    
6.4L Apache (EPS)     158.81 2.8   1.32 11.79   2.26       2.26    
6.2L Hellcat LA, LD 2015-2017 159.9 2.8   1.32 11.79 1.29 2.26       2.26    
6.2L Hellcat (EPS) LA, LD, WK, WD 2018- 159.9 2.8   1.32 11.79   2.26       2.26    
6.2L Hellcat Redeye LA, LD 2018- 159.9 2.8   1.32 11.79   2.26       2.26    
6.7L Cummins DD, DJ, DP, D2 2013-2019 201.5 3.24   1.67 2.39 2.39 2.61     1.24 1.67    
6.7L Cummins Upgrade DD, DJ, DP, D2 2019- 201.5 3.26   1.67 2.4 2.4 2.64     1.24 1.67    
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