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Which is better for highway MPGs?; Stock flywheel and clutch or G13 flywheel and clutch?
Topic Started: Jan 24 2010, 03:05 PM (1,025 Views)
starscream5000
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Got 70 MPG?

Been reading in the build up section and seen where some people are using the G13 flywheel and clutch setup in their G10s for weight savings. Will this help to improve MPGs on a G10 that mainly sees 60MPH highway miles?

There are a few hills on this road, but nothing so steep that I've had to downshift to get up and over in the past...
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Coche Blanco
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You won't see a difference.
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starscream5000
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Got 70 MPG?

Care to elaborate on why exactly?
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Coche Blanco
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Flywheels only affect RPM change, which doesn't happen (a lot) on the highway.
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starscream5000
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Got 70 MPG?

Coche Blanco
Jan 24 2010, 05:22 PM
Flywheels only affect RPM change, which doesn't happen (a lot) on the highway.
Okay, with that said then, why do people buy the SRD pulley? It's lighter, frees up some power, is attached to the crankshaft as well, and with the "free power" you should also be able to maintain a steady speed without using as much of the motor's power, thus increasing FE.

Or am I missing something? Wouldn't the lighter flywheel do the same thing?
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Alpine
1020cc G10 GOML

i think the lighter flywheel increase acceleration in lower gears and loses top speed
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Murf 59
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Our motors have a power stroke only every 120 degrees. So we need a heavier fly wheel on a day to day basis. All it does is store energy in between power strokes. I am running one on the engine for the Starr. As for mileage in day to day comuting. Not sure. I would think, that on the flat ground, it would be an improvement. But I can not prove that. And remember that your tires and wheels act as fly wheels once you are rolling. Thats why the 4x4s with the big assed tires kill transmissions. To much flywheel weight. It really exceeds the design, by a lot. If you try this let us know how well it works. It is a straight bolt in. And it runs a bigger clutch.
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Woodie
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starscream5000
Jan 24 2010, 11:21 PM
Coche Blanco
Jan 24 2010, 05:22 PM
Flywheels only affect RPM change, which doesn't happen (a lot) on the highway.
Okay, with that said then, why do people buy the SRD pulley? It's lighter, frees up some power, is attached to the crankshaft as well, and with the "free power" you should also be able to maintain a steady speed without using as much of the motor's power, thus increasing FE.

Or am I missing something? Wouldn't the lighter flywheel do the same thing?
Yes, you are missing something which Coche Blanco pointed out right there in what you quoted. The lighter weight (flywheel or pulley) only has an effect while the RPM is changing. It will rev up or slow down much faster with the clutch depressed. As you're accelerating the car, it will free up maybe 1 hp, not a lot as the rate of change isn't very fast. At a steady cruise, there will be no difference whatsoever.
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starscream5000
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Got 70 MPG?

Woodie
Jan 25 2010, 06:51 AM
Yes, you are missing something which Coche Blanco pointed out right there in what you quoted. The lighter weight (flywheel or pulley) only has an effect while the RPM is changing. It will rev up or slow down much faster with the clutch depressed. As you're accelerating the car, it will free up maybe 1 hp, not a lot as the rate of change isn't very fast. At a steady cruise, there will be no difference whatsoever.
Okay, I understand it a little better now. I may still go this route due to the larger clutch disc. It should last longer on the G10 motor, don't you think?
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Murf 59
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It will last about the same. But you can use/work it a little harder. I think our G10s are like 6'3/4", the G13s are 7.5". if your car is loaded heavy, it will help. Or if you live in a hilly area, like Frisco. It will make a big difference
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starscream5000
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Got 70 MPG?

I do have to drive over about 6 good sized hills each morning, but they're all on the highway and I've never needed to downshift to get up going 60MPH and using DWL.
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