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Lightened Flywheel #612063
11/01/20 11:02 AM
11/01/20 11:02 AM
Joined: Nov 2018
Posts: 1,534
Northants, UK
TBM Online NoMood OP
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Joined: Nov 2018
Posts: 1,534
Northants, UK
The rear core plug has gone on my crossflow, so I'm going have to get it into my local garage to get it (and the others) replaced.

While it's out, I'll get the clutch checked and replaced if necessary. I've also been toying with the idea of sticking in a lightened flywheel.

Any thoughts/tips/hints experience with flywheels? It's the 1600GT.

Cheers

Phil

Last edited by TBM; 11/01/20 11:56 AM.

1972 4/4 4 seater
Too many ratty motorbikes
Re: Lightened Flywheel [Re: TBM] #612077
11/01/20 01:32 PM
11/01/20 01:32 PM
Joined: Apr 2017
Posts: 1,098
Staffordshire
IvorMog Offline
Has a lot to Say!
IvorMog  Offline
Has a lot to Say!

Joined: Apr 2017
Posts: 1,098
Staffordshire
Have a chat with Burton Power

Burton Power Flywheel


Bob

1999 4/4 2 litre Zetec
Re: Lightened Flywheel [Re: TBM] #612078
11/01/20 01:45 PM
11/01/20 01:45 PM
Joined: Nov 2018
Posts: 1,534
Northants, UK
TBM Online NoMood OP
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Joined: Nov 2018
Posts: 1,534
Northants, UK
Yep was planning to give them a call Monday, but I was after some personal experience if possible.

I've read some stuff online (not Morgan) - a mild lightened steel flywheel will give quicker revs, and better engine braking allegedly, but I'm seeing some contrary information about mpg - some are saying better mpg due to lack of weight, others are saying worse due to lack of inertia of heavier wheel..


1972 4/4 4 seater
Too many ratty motorbikes
Re: Lightened Flywheel [Re: TBM] #612085
11/01/20 02:30 PM
11/01/20 02:30 PM
Joined: Jul 2011
Posts: 1,934
Kent & Dorset, UK
twotribes Offline
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Kent & Dorset, UK
Originally Posted by TBM
The rear core plug has gone on my crossflow, so I'm going have to get it into my local garage to get it (and the others) replaced.

While it's out, I'll get the clutch checked and replaced if necessary. I've also been toying with the idea of sticking in a lightened flywheel.

Any thoughts/tips/hints experience with flywheels? It's the 1600GT.

Cheers

Phil



On a road car? My initial thought is don't do it unless the current flywheel is so over-specified that it is preventing quick gear shifts.

Yes, lightening the flywheel will feel like the engine wants to rev more readily which will be of most benefit if the power delivery is all at the top end of the rev range, but it's not without downsides:

Typically, an uprated clutch is matched to a lightened flywheel (due to the reduction in rotational inertia, more throttle must be used to prevent stalling or clutch slip especially on downshifts). Clutches do take more of a beating, unless...
You develop the habit of using the heel of your right foot to brush the throttle whilst downshifting under braking. If you're not in the habit of doing this (I couldn't think of a bigger PITA on a road car) then you will quickly realise what job your original flywheel was doing.
If you are like my Dad (who was taught to drive this way to match revs and blip the throttle on downshifts) then you'll disregard my comments and think that heavy flywheels are just there to protect engines from bad drivers!


Stuart
"There's no skill substitute like cubic inches."
Re: Lightened Flywheel [Re: TBM] #612092
11/01/20 02:59 PM
11/01/20 02:59 PM
Joined: Nov 2018
Posts: 1,534
Northants, UK
TBM Online NoMood OP
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TBM  Online NoMood OP
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Posts: 1,534
Northants, UK
Thank you,

Just found this on Burtons Website:

Unless the flywheel is abnormally heavy we do not recommend flywheel lightening for road stages of tune. The slight loss of low speed torque and flexibility resulting from the tuning modifications carried out, can be greatly exacerbated by a lightweight flywheel.


1972 4/4 4 seater
Too many ratty motorbikes
Re: Lightened Flywheel [Re: TBM] #612095
11/01/20 03:41 PM
11/01/20 03:41 PM
Joined: Dec 2011
Posts: 1,943
Seattle, USA
B
Button Offline
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B

Joined: Dec 2011
Posts: 1,943
Seattle, USA
On My ZETEC powered 1961 DHC I had an aluminum flywheel. I did not like it in town and noticed no difference on the Interstate. Removed the light flywheel and installed the original iron. Much easier in Town. No difference in MPG that I could ascertain but I was not focused on mileage.


Button
Re: Lightened Flywheel [Re: Button] #612096
11/01/20 03:43 PM
11/01/20 03:43 PM
Joined: Dec 2011
Posts: 1,943
Seattle, USA
B
Button Offline
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Button  Offline
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Joined: Dec 2011
Posts: 1,943
Seattle, USA
Originally Posted by Button
On My ZETEC powered 1961 DHC I had an aluminum flywheel. I did not like it in town and noticed no difference on the Interstate. Removed the light flywheel and installed the original iron. Much easier in Town. No difference in MPG that I could ascertain but I was not focused on mileage.


I should add Seattle has rather steep hills.


Button
Re: Lightened Flywheel [Re: TBM] #612103
11/01/20 04:55 PM
11/01/20 04:55 PM
Joined: Jul 2019
Posts: 981
L
Luddite Offline
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Luddite  Offline
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L

Joined: Jul 2019
Posts: 981
Phil, I have no experience with lightened flywheels though might add to the list of those who suggest to leave it standard as many a tuning effort ends up a disappointment as the initial balance of the engine can be upset.

I do have some experience of replacing a core plug on that block, though in a Lotus Elan and at the side of the road, it was a long time ago. I used a coin of the realm, I had a ball peen hammer in my tool kit and dished the coin a little bit, also used a smear of Araldite round the edge of the coin, which if I remember correctly was a 2p.. (-: Put the coin in the block with the now raised side facing out and tapped it to make it expand into the block for to tighten the fit.... worked a treat.. (-:

Re: Lightened Flywheel [Re: Luddite] #612105
11/01/20 05:14 PM
11/01/20 05:14 PM
Joined: Nov 2018
Posts: 1,534
Northants, UK
TBM Online NoMood OP
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Posts: 1,534
Northants, UK
Originally Posted by Luddite
Phil, I have no experience with lightened flywheels though might add to the list of those who suggest to leave it standard as many a tuning effort ends up a disappointment as the initial balance of the engine can be upset.

I do have some experience of replacing a core plug on that block, though in a Lotus Elan and at the side of the road, it was a long time ago. I used a coin of the realm, I had a ball peen hammer in my tool kit and dished the coin a little bit, also used a smear of Araldite round the edge of the coin, which if I remember correctly was a 2p.. (-: Put the coin in the block with the now raised side facing out and tapped it to make it expand into the block for to tighten the fit.... worked a treat.. (-:


It's very frustrating that of the 4 plugs, it's the one that's most difficult to get to! Reckon it's going to be several hundreds to fix for a 50p part...


1972 4/4 4 seater
Too many ratty motorbikes
Re: Lightened Flywheel [Re: TBM] #612109
11/01/20 06:00 PM
11/01/20 06:00 PM
Joined: May 2015
Posts: 221
North Yorks
John07 Offline
L - Learner Plates On
John07  Offline
L - Learner Plates On

Joined: May 2015
Posts: 221
North Yorks
Phil,
Just for your interest the book "Tuning Escorts and Capris" by David Vizard it states that the 1600GT flywheel is 18.5 lbs and that the standard 1600 is 26lbs.
I agree with the others in that you don't want the flywheel too light.
Cheers
john

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