Flywheel Specifications

The AERA Technical Committee suggests referring to the following
flywheel specification chart when re-surfacing flywheels.

                    Type of 
Manufacturer        Flywheel  Specs          Comments
_________________________________________________________________

Allis Chalmers      Cup       1.437         D17,D19,190XT
                                             Tractors
AMC                 Cup       .125          2.5L (GM engine)
Alpha Romeo         Cup       .878
BMW                 Step      .013-.015     320i
Caterpillar         Cup       2.937 +/-.005 #9N2646 Cast Number
Chrysler/Mitsubishi Cup       .600-.605     2.0L DOHC, #9801
                                             Cast Number
Chrysler            Cup       1.00          3.7L engine
Cummins             Cup       2.925    
Cummins             Cup       2.937         2 piece clutch
DDC                 Flat      1.582         8.2L, Minimum
                                             thickness
Fiat, Spider        Step      .018          1600 engine
Ford, Falcon        Cup       1.00          6 Cylinder engines
Ford, Courier       Cup       .285
Ford                Cup       .310
Ford, Ranger        Cup       .003          V6 Cylinder engines
Ford Truck          Cup       1.500         534 CID Truck
Ford Truck          Flat      .965          New Thickness
Ford                Cup       1.140-1.160    Model A 
GM, OHC Brazilian   Flat      .750          New Thickness
GM                  Cup       .125          2.5L, & Vega
GM, Buick           Cup       .125          V6 Engines
GM, Spirit          Cup       .195
GM, Sprint          Cup       .1969         Chevrolet/Suzuki
Honda               Cup       .030          Small cup
Honda               Cup       .030          #K4SC16AG Cast
                                             Number
Honda               Cup       .100-.104     
Honda               Cup       .785          Long alignment pins
Honda               Cup       .900           Short alignment pins
Honda, Accord       Cup       .615          1986
Hyundai, Excel      Flat                     Mitsubishi engine
Isuzu               Cup       .010-.017     Trooper, Pup
Isuzu, Diesel       Cup       1.691-1.695   6BD1, 6BDT engines
Mack Midliner       Flat      1.260 Min.    Measure from
                                             crank/mount to disc
Mazda               Cup       .062          RX2 Rotary engines
Mazda, RX7          Cup       .310
Mazda, 2.2L, 1987   Cup       .785          Hyd. Clutch,
                                             Segmented wheel
Mazda, 2.0L         Cup       .805          Hyd. Clutch, .020
                                             max/removal
Mercedes, 240D      Cup       .885
Navistar, 404/446   Flat      .750          New thickness
Navistar, 6.9L      Flat      1.410         Minimum thickness
Navistar 9.0L       Flat      1.585         Minimum thickness
Nissan              Flat                     With groove
Nissan, Maxima      Flat                     With groove, #425
                                             Cast Number
Nissan, (Datsun)    Step      .003-.005     No groove
Nissan, 
(Sentra,Stanza)     Step      .006-.010     1.6L & 2.0L engines
Nissan, B2000       Cup       .807 new      Max stock removal
                                             .020
Nissan,(Datsun)240Z Step      .010          With groove
Renault             Step      .021          1.4L Alliance
Saab, 96            Cup       .656
Subaru              Cup       .830           Justy
Subaru              Cup       .875
Subaru              Cup       .905           4X4 Brat
Suzuki              Cup       .070
Suzuki              Cup       .197          1.0L, 3 cyl
Toyota              Step      .018-.022     Large alignment pins
Toyota, 22RE        Step      .018-.022     #627 Cast Number
Toyota              Cup       .055          Small cup
Toyota              Cup       .965-.970     Tercel, large cup
Toyota              Step      .040          Tercel, step
Toyota              Step      .020          Land Cruiser
VW                  Cup       .945          Air cooled, 6 Volt
VW                  Cup       .913-.918     210MM Clutch
VW                  Cup       .830-.835     Rabbit/Golf/Scirocco
Vanagon             Cup       .982          Water/Air cooled bus
                                             engine
VW                  Cup       .830          Air cooled engine   
VW                  Cup       .885          Air cooled engine

Specifications listed for Step type flywheels refer to the
height of the wear surface above the pressure plate mounting
surface.  Specifications for Cup type flywheels refer to the
height of the pressure plate mounting surface above the wear
surface.

                                     The AERA Technical Committee

June 1992 - TB 677R 
(Please destroy TB 677)

##END##

                         Shallow Oil Ring Groove Pistons

The following engines utilize pistons with shallow oil ring grooves of less than .175 in depth.   Several engines use pistons with semi-shallow grooves with a depth of .175-.200.
Chrysler 
                                 OE        Piston
Displacement           Bore      Year      Description    Sample Depth

1.5L (89.5 CID)75.5mm            85-89     Mitsubishi     .165
2.0L (122 CID)         85.0mm    83-87     Mitsubishi     .160
2.2L (135 CID)         87.5mm    85-89     (Semi-Shallow) .180
2.5L (153 CID)         87.5mm    86-89     (Semi-Shallow) .180
2.6L (156 CID)         91.1mm    87-88     Mitsubishi     .160
3.0L (181 CID)         91.1mm    87-89     Mitsubishi     .160

Ford
                                 OE        Piston
Displacement           Bore      Year      Description    Sample Depth

1.3L (79 CID)          71.0mm    88-89     Festiva        .140
1.6L (98 CID)          78.0mm    88-89     Tracer         .155
1.9L (116 CID)         82.0mm    85-89     Escort         .155
2.2L (133 CID)         86.0mm    89          Probe          .160
2.3L (140 CID)         96.0mm    85-89     Single & 
                                                                 dual plug      .150
2.9L (177 CID)         93.0mm    86-89     Truck     
3.0L (183 CID)         89.0mm    88-89     Taurus/Sable   .140
3.8L (232 CID)         96.8mm    88-89                          .160
5.0L (302 CID)         101.6mm   86-89                         .145

General Motors
                                 OE        Piston
Displacement           Bore      Year      Description    Sample Depth

1.0L (61 CID)          74.0mm    85-89     Sprint                  .150
1.5L (92 CID)          77.0mm    85-89     Spectrum            .145
1.6L (97.6 CID)82.0mm            84-87     Chevrolet      
                                                           (Semi-Shallow)         .185
1.6L (98 CID)          81.0mm    85-88     Nova (Toyota)       .135
1.6L (98 CID)          81.0mm    88-89     Nova DOHC 
                                                                    (Toyota)            .135
1.6L (98 CID)          79.0mm    88-89     Pontiac Le Mans          .170
1.8L (112 CID)         84.8mm    82-86     OHC (Semi-Shallow)  .180
2.0L (121 CID)         86.0mm    87-89     OHC (Semi-Shallow)  .180
2.0L (121 CID)         89.0mm    85-89     OHV Chevrolet           .170
2.2L (135 CID)         89.0mm    90        OHV Chevrolet  
2.3L (138 CID)         92.0mm    87-89     Quad 4                         .160
2.5L (151 CID)         101.6mm   81-89     Pontiac                        .170
2.8L (173 CID)         89.0mm    85-89     Chevrolet                     .170
3.1L (191 CID)         89.0mm    89         Chevrolet                       .170
3.3L (204 CID)         94.0mm    89          Buick 
                                                               (Semi-Shallow)             .180
3.8L (231 CID)         96.5mm    88-89     Buick 3800                   .170
4.1L (252 CID)         88.0mm    82-89     Cadillac HT-4100        .165
4.3L (265 CID)         95.3mm    80-81     Pontiac V8                   .165
4.3L (262 CID)         101.6mm   85-89     Chevy V6 
                                                               (Semi-Shallow)             .190
4.5L (273 CID)         92.0mm    88-89     Cadillac V8
4.9L (301 CID)         101.6mm   80-81     Pontiac V8 (Turbo)     .170
5.7L (350 CID)         101.6mm   86-89     Various GM 
                                                                   (Semi-Shallow)          .190

AERA members are cautioned to pay particular attention to the oil ring groove depth when selecting piston rings regardless of piston manufacturer.  This is particularly important when replacing rings on OE manufactured pistons.

                                                                           The AERA Technical Committee