Grinding Wheels for Flywheel Grinders – 6” Flared Cup
| Flywheel Metallurgy | Part No. | Description of Wheel |
|---|---|---|
| Cast/Steel | 11A2 | CBN |
| Cast Iron | 800000 | Softer than 801116 (narrower back) |
| 801112 | Italian OE spec's Best all round wheel | |
| 801112A | Kinik similar to Italian 801112 | |
| 801116 | Harder than 801112/FGW57 | |
| 801119 | KG Ceramic grain, excellent for very hard material | |
| FGW 57 | USA spec's similar to 801112 | |
| Cast Steel | FGW 54 | Softer than 801112/FGW57 |
| 800125S | Straught sided 5 | |
| Billet Steel | Bv259977 | Flaired Cup White |
| 801119 | KG Ceramic grain, excellent for very hard material | |
| 100mm cup wheel | BV203939 | Recessed flywheels |
| 100mm cup wheel | 81814 | Recessed flywheels Pink |
| 150mm cup wheel | BV259977 | Recessed flywheels |
Match the stone to the materialMost flywheels are cast iron (soft) but there is an increasing number of cast steel; (medium) many trucks, bus’s and agricultural :billet steel (hard) many new European models including VW & late V8 GM vehicles.
How to test a flywheel for Hardness
For good results, softer flywheels need to be ground with harder stones. Harder flywheels need softer stones. To determine flywheel hardness; spark test a flywheel before grinding. Using whatever grinding wheel is on the machine, briefly touch it to the flywheel and watch the sparks fly.
Cast Iron:
(soft) flywheels make a deep red-orange spark that travels only a short distance before burning out.
Cast Steel:
(medium) flywheels make a light orange to golden spark that travel further than cast.
Billet Steel:
(very hard) flywheels make a bright yellow-white spark that travels a long distance.
Coolant:
It is absolutely critical that a good quality coolant is used, SAE 187 is an excellent product but should not be used in a greater percentage mixture than 3%.