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Old 04-10-2012, 07:44 AM
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External to internal flywheel

Hi,
does anybody balance 1 piece RMS flywheel(external) to neutral 0?
want to buy
http://www.summitracing.com/parts/HAY-20-530/
but not sure is it possible at all. Maybe someone know how do they make counterweight on it? casting like this
http://www.carcraft.com/techarticles.../photo_06.html
or already drilled holes?

thanks

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Old 04-11-2012, 04:53 PM
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Quote:
Originally Posted by solidmetalbro
Hi,
does anybody balance 1 piece RMS flywheel(external) to neutral 0?
want to buy
http://www.summitracing.com/parts/HAY-20-530/
but not sure is it possible at all. Maybe someone know how do they make counterweight on it? casting like this
http://www.carcraft.com/techarticles.../photo_06.html
or already drilled holes?

thanks
The 1-Piece RMS Cranks don't have room for the extra weight at the rear end. That's why the weight is added to the Flywheel/Flexplate. The Harmonic Damper on front remains Neutral balance, called half & half balance or partial external balanced crank by most shops using a Neutral balance 1-piece RMS Crank. Scats' 935050L 383 1-Pc. RMS Crank is an example.
The Flywheel in the CarCraft mag is custom balanced for the Rotating Assembly. Instead of adding weight they removed weight on the opposite side. You would need to have your Rotating Assy. rebalanced if your using non-stock weight parts = Pistons & Rods.
The Hays #20-530 Flywheel above is for a 1-Pc. RMS neutral/internal balance Crank which uses a Neutral balance Harmonic Damper and standard weighted External balance Flywheel.
It says External balance but, when you look at the applications, these are clearly Internal balance 1-Pc RMS engines using the Partial external balance Crank >> http://www.summitracing.com/parts/HA...n/?prefilter=1

Last edited by SSedan64; 04-11-2012 at 05:01 PM.
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Old 04-11-2012, 05:47 PM
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The aluminum flywheel probably has a weight bolted to the back side. The weight could be removed and then balanced to neutral. TO balance the engine with stock weight components and a neutral flywheel will require mallory metal to be added to the crank at about $150 per piece. Expect 2 to 3 pieces.
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Old 04-11-2012, 11:26 PM
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Quote:
Originally Posted by SSedan64
The 1-Piece RMS Cranks don't have room for the extra weight at the rear end. That's why the weight is added to the Flywheel/Flexplate. The Harmonic Damper on front remains Neutral balance, called half & half balance or partial external balanced crank by most shops using a Neutral balance 1-piece RMS Crank. Scats' 935050L 383 1-Pc. RMS Crank is an example.
The Flywheel in the CarCraft mag is custom balanced for the Rotating Assembly. Instead of adding weight they removed weight on the opposite side. You would need to have your Rotating Assy. rebalanced if your using non-stock weight parts = Pistons & Rods.
The Hays #20-530 Flywheel above is for a 1-Pc. RMS neutral/internal balance Crank which uses a Neutral balance Harmonic Damper and standard weighted External balance Flywheel.
It says External balance but, when you look at the applications, these are clearly Internal balance 1-Pc RMS engines using the Partial external balance Crank >> http://www.summitracing.com/parts/HA...n/?prefilter=1
Thanks for reply
Actually I want to buy balanced rotating assembly
http://www.summitracing.com/parts/ESP-B13055L030/
which is Internal balanced/neutral and as I understand right need to use internal/neutral balanced Flywheel and internal/neutral balanced balancer.
at the same time I could buy External balanced Rotating assembly
http://www.summitracing.com/parts/ESP-B13005E030/
which is external balanced and includes balancer and flexplate
Also summitracing selling External and Internal balance crankshafts,
so Hays 20-530 is for stock type 1-piece RMS external balance crank
that means it must have counterweight as I understand right it is not neutral balanced at all

Quote:
Originally Posted by lmsport
The aluminum flywheel probably has a weight bolted to the back side. The weight could be removed and then balanced to neutral. TO balance the engine with stock weight components and a neutral flywheel will require mallory metal to be added to the crank at about $150 per piece. Expect 2 to 3 pieces.
I wish the counterweight is bolted to it
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