10CC flywheel?

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PoolGuy
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10CC flywheel?

Postby PoolGuy » Tue Dec 03, 2019 11:40 am

Does this look like a 10CC flywheel?
54EEF6A1-D8EF-436C-A724-A6968506F035.jpeg
54EEF6A1-D8EF-436C-A724-A6968506F035.jpeg (471.39 KiB) Viewed 140 times
And any ideas what these letters mean?
Looks like IRB. or possibly LRB.
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philthehill
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Re: 10CC flywheel?

Postby philthehill » Tue Dec 03, 2019 12:43 pm

The standard 1098cc flywheel has a centre hole of 1 3/4"

The 10CC flywheel mounting bolt PCD is also larger than the standard 1098cc flywheel which has a PCD of 2.5". So if the PCD (diagonal) is larger than 2.5" and the flywheel centre hole is larger than 1 3/4" it can be safely assumed to be a 10CC unit.

Here is link about 'A' Series Sprite/Midget flywheels:-

http://www.spriteparts.com.au/tech/flywheels.html

See also:-

http://www.spritespot.com/phpBB3/viewto ... =14&t=5948

If looks as if the flywheel has been PCD re-drilled and the centre machined to fit the 10CC crankshaft.

See also:-

viewtopic.php?t=56808


PoolGuy
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Re: 10CC flywheel?

Postby PoolGuy » Tue Dec 03, 2019 1:52 pm

PCD is 2.75 and there’s no evidence of any redrilling.
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geoberni
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Re: 10CC flywheel?

Postby geoberni » Tue Dec 03, 2019 2:08 pm

I don't mind displaying my ignorance of such things...... A what flywheel?
10CC?
As opposed to what?
I thought flywheels were 803, 948, 1098 cc etc :o
Basil the 1955 series II

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PoolGuy
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Re: 10CC flywheel?

Postby PoolGuy » Tue Dec 03, 2019 2:15 pm

Sorry Geo, some Midgets had a ‘stronger’ 1098 engine, the crank had 2” mains rather than 1.75”
, it’s known as a 10CC rather than 10CG.

philthehill
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Re: 10CC flywheel?

Postby philthehill » Tue Dec 03, 2019 3:15 pm

Poolguy

Thanks for posting the photos with rule - I can now add those dimensions to my data base.

Phil


geoberni
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Re: 10CC flywheel?

Postby geoberni » Tue Dec 03, 2019 3:22 pm

PoolGuy wrote:
Tue Dec 03, 2019 2:15 pm
Sorry Geo, some Midgets had a ‘stronger’ 1098 engine, the crank had 2” mains rather than 1.75”
, it’s known as a 10CC rather than 10CG.
Thanks, it makes sense for the 'sportier' motor. :)
All these different numbers, depending on whether 'original' or reconditioned Silver Seal/Gold Seal........
Basil the 1955 series II

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PoolGuy
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Re: 10CC flywheel?

Postby PoolGuy » Tue Dec 03, 2019 3:27 pm

philthehill wrote:
Tue Dec 03, 2019 3:15 pm
Poolguy

Thanks for posting the photos with rule - I can now add those dimensions to my data base.

Phil
Do
You think it’s safe to say it’s a 10CC flywheel? I only ask because I was mistakenly sold it as suitable for my 1098 rebuild, I don’t want to pass it off on ebay as something it isn’t. And I still need a 1098 Minor flywheel :evil:

philthehill
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Re: 10CC flywheel?

Postby philthehill » Tue Dec 03, 2019 3:34 pm

A bit of additional information about the 10CC engine - To comply with the requirements of the Formula Junior regulations BMC had to produce a certain number of production blocks - so the 10CC engine was not really produced to be a sportier engine but the basis of a racing engine acceptable for inclusion in the Formula Junior racing series.

Below is one of the derivative 'A' Series made for the Formula Junior race series
XSP Sprite engine.jpg
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XSP Sprite engine 2.jpg
XSP Sprite engine 2.jpg (381.95 KiB) Viewed 67 times
Last edited by philthehill on Tue Dec 03, 2019 5:21 pm, edited 2 times in total.


philthehill
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Re: 10CC flywheel?

Postby philthehill » Tue Dec 03, 2019 3:39 pm

Poolguy
I am certain as far as I can be that the flywheel in question is from a 10CC engine.

10CC engine flywheels fetch a very good prices because they are rare and sought after.

Anyone who is after a 10CC engine flywheel will know his/her onions and will be able to determine its originality.

I think that you are quite in order to advertise it as a !0CC engine flywheel. Include the dimensions that you have shown in the above photos.

Here is a genuine 10CC flywheel on 'e' bay for comparison. You can use the various datum points to compare.
Note the price - when they do come up for sale they are all offered around the £90 - £110 plus and they do sell at that price.

https://www.ebay.co.uk/itm/MG-MIDGET-FI ... SwXetZQlzY

Phil


PoolGuy
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Re: 10CC flywheel?

Postby PoolGuy » Tue Dec 03, 2019 4:06 pm

Cheers Phil. Hopefully I can offset some of the hassle. I really didn't think it'd be difficult to get a 1098 flywheel. First one was never sent by the seller on Ebay. Then this one isn't the right one :(


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