MED INLINE 7.5 LIGHTWEIGHT STEEL FLYWHEEL
Description
The MED inline flywheel is CNC machined from billet EN8 steel to suit 1275 Sprite/Midget applications. This flywheel is suitable for all performance road and competition engines, weighing just 3.9kg.
The design suits a 7.5-inch heavy-duty clutch cover and organic bonded clutch plate. Complete with original inertia-style ring gear to suit either the high-torque starter motor or slimline starter motor.
Please note - this flywheel will not fit the 1275 Marina crankshaft without modification. Please contact us for more information.
This is also available as a complete 7.5-inch steel clutch assembly.
Frequently Asked Questions
What's the performance advantage of using a lightweight flywheel?
Weight loss helps acceleration, and reducing weight from the rotating assembly of the engine has an even greater effect here than the weight loss alone. Installing a lightweight flywheel will considerably improve the car's acceleration compared to the standard heavy setup, and is a must for any performance-oriented A-Series engine.
Is this a direct replacement for the standard Sprite/Midget flywheel?
Yes, but only 1275cc models, and it must be used alongside our 7.5" clutch plate and cover, plus roller release bearing conversion. It will not fit small-bore engines or standard clutch covers.
Can I lighten the standard flywheel instead?
You can, but the MED flywheel is CNC machined from EN8 steel, so we can safely make these far lighter than the standard cast iron flywheel. Only very mild lightening of the standard flywheel is recommended, as there is a real risk of catastrophic failure. This design also upgrades the clutch cover and plate to handle more torque, while the EN8 steel gives better durability on the friction face.
Does a lightweight flywheel increase engine power?
Lightening the flywheel makes no difference to the power output of the A-Series engine, but the lighter overall rotating assembly will sap less energy under acceleration. Therefore, the available power can be used more efficiently, making the car faster off the line. This is especially useful in a lightweight classic car with more modest power outputs.
Will this suit a 1275 Morris Marina crankshaft?
As supplied, no, but a competent machine shop will be able to adapt the flywheel to suit. The Marina crankshaft has a larger diameter flywheel mounting face, so you will need to enlarge the centre bore of the flywheel to suit. It is approximately 0.040" larger in diameter.
Which starter motor do I need to use?
Either the standard original type, or one of our high-torque upgrades, part number MED-5220-HTII. Alternatively, for those on a weight-saving mission, we also have the micro starter motor - part number MED-5255-MSI.
Do I need anything else to fit the flywheel?
We would recommend a set of ARP flywheel bolts, part number MED-3502-QB, to secure the flywheel to the crankshaft. Don't forget you will need the Ford-style cover, 7.5" plate and roller bearing.
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