Fly wheels : MGB & GT Forum : The MG Experience

Fly wheels #1
Blacksheep william smith winchester, TN, USA Sign in to contact 1979 MG MGB MkI "Green Hornet"	Topic Creator (OP) Oct 19, 2014 04:42 PM Joined 10 years ago 478 Posts

Hi Guys: Well I am switching the parts off the 79 model engine to the 76 model and find that the fly wheels are different in this regard -The fly wheel on the 79 model has only 1 guide pin and the 76 model has 2 pins.I am using the 76 model engine and wanted to use the 79 fly wheel as it is in a lot nicer shape surface wise. Question is can I drill a hole for the out pin and use the 79 fly wheel on the 76.They look the same except for the extra pin on the 76 model.Thanks,Bill

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Re: Fly wheels #2
dickmoritz Dick Moritz Philly 'burbs, PA, USA Sign in to contact	Oct 19, 2014 04:59 PM Top Contributor Joined 14 years ago 26,263 Posts

Your friendly local machine shop guy will have a special tool for removing dowel pins. Takes about a minute. Bribe him with a beer to snatch one out for you... winking smiley

Dick

Errabundi Saepe, Semper Certi
(Often wrong, but always certain)

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Re: Fly wheels #3
Blacksheep william smith winchester, TN, USA Sign in to contact 1979 MG MGB MkI "Green Hornet"	Topic Creator (OP) Oct 19, 2014 05:44 PM Joined 10 years ago 478 Posts

Dick I sent you a pm,thanks,Bill

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Re: Fly wheels #4
ohlord Rob C A tiny Island off the coast of Washington State, N.W., USA Sign in to contact 1957 Land Rover Series I "EYEYIYI" 1957 Land Rover Series I "OVRLND" 1971 MG MGB 1971 MG MGB "Bedouin 2" & more	Oct 19, 2014 08:19 PM Top Contributor Joined 12 years ago 28,877 Posts

Remove pin and have it resurfaced and lightened about 6 lbs and balanced,replace all clutch parts from disc TR7 5speed disc smiling smiley

to TO bearing. You and the engine will enjoy the new found peppiness

LNDRVR4X4.COM
Home of Project "INCARN8'

1957 Series 1 Land Rover electric VEHICLE CONVERSION

FIXITUPCHAP.COM
FIXITUPCHAP INCORPORATED

RD3 Radar/ Electronic Warfare Technician
VIETNAM 1969-1972

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Re: Fly wheels #5
fast-MG.com Dave Headley Cortez, 4 corners, Colorado, USA Sign in to contact	Oct 19, 2014 09:00 PM Top Contributor Joined 15 years ago 9,605 Posts

You may be able to remove the extra dowel with a vice grip and pry bar. Twist the dowel while prying.

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Re: Fly wheels #6
spikemichael Michael Caputo Canton, IL, USA Sign in to contact 1973 MG MGB "Freebie" 1973 MG MGB 1974 MG MGB "Spike" 1976 MG MGB "Cecil" & more	Oct 19, 2014 09:51 PM Top Contributor Joined 14 years ago 19,079 Posts

never been a fan of the lightened flywheel theory. sure the engine spins up faster but it spins down faster too.

Michael J. Caputo
'79, '77, '76, '74.5 (rubber dual SU), and '73 owner. Extensive experience in 12v Audio System design and installation. Vendor of Regalia and Promotional Products since 1993. Supplier of Accessories to MOSS. Forum Member since 2009; with a warped sense of humor since birth. Publisher of the annual MGB & GT Calendar, mailed worldwide.

2024 MGB & GT Calendar www.mgbcalendar.com

Please send photos for next year's calendar to photos25@mgbcalendar.com. If you need help with your Weber downdraft carburetor, feel free to call me at 978-249-5760, USA, Central Time!

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Re: Fly wheels #7
ohlord Rob C A tiny Island off the coast of Washington State, N.W., USA Sign in to contact 1957 Land Rover Series I "EYEYIYI" 1957 Land Rover Series I "OVRLND" 1971 MG MGB 1971 MG MGB "Bedouin 2" & more	Oct 19, 2014 10:21 PM Top Contributor Joined 12 years ago 28,877 Posts

try one

,spinning up faster allows crisper shifts and lower rotational mass. 16lbs is a sweet spot.that really lets the engine wind without affecting anything to determent.
The 21-22 lb stock FW has always been a shortfall especially on the later LC cars.

LNDRVR4X4.COM
Home of Project "INCARN8'

1957 Series 1 Land Rover electric VEHICLE CONVERSION

FIXITUPCHAP.COM
FIXITUPCHAP INCORPORATED

RD3 Radar/ Electronic Warfare Technician
VIETNAM 1969-1972

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Re: Fly wheels #8
spikemichael Michael Caputo Canton, IL, USA Sign in to contact 1973 MG MGB "Freebie" 1973 MG MGB 1974 MG MGB "Spike" 1976 MG MGB "Cecil" & more	Oct 19, 2014 11:23 PM Top Contributor Joined 14 years ago 19,079 Posts

So the six fewer flywheel pounds would net an apparent 5 additional HP in first gear but have no gain of top end speed or 'at speed' horsepower.

I find first gear nearly useless anyway as I want to be in second before I am across the intersection.

Michael J. Caputo
'79, '77, '76, '74.5 (rubber dual SU), and '73 owner. Extensive experience in 12v Audio System design and installation. Vendor of Regalia and Promotional Products since 1993. Supplier of Accessories to MOSS. Forum Member since 2009; with a warped sense of humor since birth. Publisher of the annual MGB & GT Calendar, mailed worldwide.

2024 MGB & GT Calendar www.mgbcalendar.com

Please send photos for next year's calendar to photos25@mgbcalendar.com. If you need help with your Weber downdraft carburetor, feel free to call me at 978-249-5760, USA, Central Time!

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Re: Fly wheels #9
ohlord Rob C A tiny Island off the coast of Washington State, N.W., USA Sign in to contact 1957 Land Rover Series I "EYEYIYI" 1957 Land Rover Series I "OVRLND" 1971 MG MGB 1971 MG MGB "Bedouin 2" & more	Oct 20, 2014 05:27 AM Top Contributor Joined 12 years ago 28,877 Posts

The lower rotational mass allows the engine to spin up faster ,accelerate quicker, allows faster gear changes.If you putt around in your MGB the way you drive, and have no need for a quicker revving ,peppier accelerating, faster shifting MGB then you apparently have no need for a lightened flywheel smileys with beer

it and the suggestion of replacing all clutch parts whenever pulling an engine were directed to the OP'
Maybe he is a fan of a proven way to liven up an MGB engine

LNDRVR4X4.COM
Home of Project "INCARN8'

1957 Series 1 Land Rover electric VEHICLE CONVERSION

FIXITUPCHAP.COM
FIXITUPCHAP INCORPORATED

RD3 Radar/ Electronic Warfare Technician
VIETNAM 1969-1972

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Re: Fly wheels #10
Blacksheep william smith winchester, TN, USA Sign in to contact 1979 MG MGB MkI "Green Hornet"	Topic Creator (OP) Oct 20, 2014 08:42 AM Joined 10 years ago 478 Posts

Hi Guys: Many Thanks for all the information! I will try to remove the pin first from the crankshaft end and if that don't work will go for drilling a hole for the pin.
I don't think I will go for the lightening of the wheel.Seems to me(I am probably wrong)the weight of the fly wheel gives the engine more tourque as a spinning 10 lib weight is hard to stop than a 5 lb weighted one.Back to work now!! Bill

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Re: Fly wheels #11
bills Bill Spohn W. Vancouver, , BC, Canada Sign in to contact 1956 MG MGA 1958 MG MGA Twin-Cam 1962 MG MGA MkII Coupe 1965 Jensen CV8 & more	Oct 20, 2014 10:19 AM Top Contributor Joined 19 years ago 17,977 Posts

I like a lightened flywheel but never go overboard for the street.

If you think the MGAs are bad (they use essentially the same wheel as the 3 main MGB but it isn't hollowed out at all - very heavy), I rebuilt an Austin Healey 100 engine once - the flywheel weighed in the low 40 lb. range! Frickin' lorry engine! I must say it did have a smooth idle though......

Bill Spohn www.rhodo.citymax.com/carstuff.html
Current: 1958 MGA Twincam (race car (170 bhp)),1962 MGA Deluxe Coupe (98 bhp)
1957 Jamaican MGA (200 bhp)1965 1971 Jensen Interceptor (350 bhp)
2009 Pontiac Solstice GXP Coupe (375 bhp)
2007 BMW Z4M coupe (340 bhp)
Recent: 1969 MGC roadster (175 bhp),Jensen CV8 (375 bhp),
1969 Lamborghini Islero S (350 bhp), 1988 Fiero GT turbo (300 bhp)
North Vancouver BC

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Re: Fly wheels #12
ohlord Rob C A tiny Island off the coast of Washington State, N.W., USA Sign in to contact 1957 Land Rover Series I "EYEYIYI" 1957 Land Rover Series I "OVRLND" 1971 MG MGB 1971 MG MGB "Bedouin 2" & more	Oct 20, 2014 01:20 PM Top Contributor Joined 12 years ago 28,877 Posts

9 pound flywheels work on street B's aluminum. A 16 pound lightened factory FW is between the two extremes. Idles smoothly and revs,accelerates quicker.

Want a quicker more enjoyable MGB lighten the flywheel it won't be detrimental to Torque or idle quality,it will make it quicker accelerating and snappier shifts.

LNDRVR4X4.COM
Home of Project "INCARN8'

1957 Series 1 Land Rover electric VEHICLE CONVERSION

FIXITUPCHAP.COM
FIXITUPCHAP INCORPORATED

RD3 Radar/ Electronic Warfare Technician
VIETNAM 1969-1972

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Re: Fly wheels #13
Blacksheep william smith winchester, TN, USA Sign in to contact 1979 MG MGB MkI "Green Hornet"	Topic Creator (OP) Oct 20, 2014 03:49 PM Joined 10 years ago 478 Posts

Hi Guys: Well I tried to get the pin out but decided best to drill a new hole which I did and it fit perfect!
As far as lightening the fly wheel I am sure that will work however all I want to do is have a nice clean car that is pleasure to drive.I am almost 80 so I won't be doing much speed shifting.Ha Thanks for all the help. Bill

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Re: Fly wheels #14
ohlord Rob C A tiny Island off the coast of Washington State, N.W., USA Sign in to contact 1957 Land Rover Series I "EYEYIYI" 1957 Land Rover Series I "OVRLND" 1971 MG MGB 1971 MG MGB "Bedouin 2" & more	Oct 20, 2014 05:23 PM Top Contributor Joined 12 years ago 28,877 Posts

Eighty is the new sixty thumbs up

We have a 93 year old member in our MGCC that till recently drove both his MGB and XKE with GUSTO

LNDRVR4X4.COM
Home of Project "INCARN8'

1957 Series 1 Land Rover electric VEHICLE CONVERSION

FIXITUPCHAP.COM
FIXITUPCHAP INCORPORATED

RD3 Radar/ Electronic Warfare Technician
VIETNAM 1969-1972

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