Page 1 of 1
What is the difference between a 6v and a 12v flywheel?
Posted: Thu Feb 05, 2004 3:16 pm
by ck85abc
As titled.
Thanks
Posted: Thu Feb 05, 2004 3:19 pm
by Honda's Killer
12v has a 200m cluch area
The 6v only is 180m
There might be a depth difference as well
Posted: Thu Feb 05, 2004 3:31 pm
by 1969dragbug
count the teeth, they are different. I think 6volt has 5 less then 12volt
Posted: Thu Feb 05, 2004 4:05 pm
by Marc
Guys, if you don't know the answer don't confuse the guy.
6v flywheels have 109 teeth. They come in both 180mm and 200mm versions.
12V flywheels have 130 induction-hardened teeth (note the blue color) and also come in both clutch sizes, although the 180 was only used on 1200 and 1300 engines, and the US got only 1500 and 1600 motors in 12V so they're rare in this country. The 130-tooth 'wheel is approximately 1/8" larger in outer diameter and won't fit into a 6V bellhousing unless the latter is clearanced slightly.
In mid-`66 the method of sealing the flywheel to the crank was changed from a gasket to an O-ring. The end of the crank was machined further to make room for the O-ring to live (you can put a gasket flywheel on an O-ring crank but not vise-versa). MOST 69 stroke cranks are O-ring, but if they're from an early `66 or a bus they could be gasket. Most 6V flywheels are gasket, but late `66 was O-ring. All 12V flywheels are O-ring.
So, there are:
109-tooth, gasket, 180mm clutch
109-tooth, gasket, 200mm clutch
109-tooth, O-ring, 180mm clutch
109-tooth, O-ring, 200mm clutch
130-tooth, O-ring, 180mm clutch
130-tooth, O-ring, 200mm clutch
36HP and older engines had a smaller diameter crankshaft and the flywheels were different at the center - although they too are 109-tooth, gasket, 180mm clutch.
Posted: Thu Feb 05, 2004 4:31 pm
by 1969dragbug
I knew there were less teeth, just not sure of how many. very nicely explained, just hope the guy can ingest the info.
Posted: Thu Feb 05, 2004 5:29 pm
by Honda's Killer
Someday I hope to be a expert.
Posted: Fri Feb 06, 2004 8:52 am
by ck85abc
1969dragbug wrote:I knew there were less teeth, just not sure of how many. very nicely explained, just hope the guy can ingest the info.
Info ingested, Thanks again mark.
Expert
Posted: Fri Feb 06, 2004 9:00 am
by Santa Clarita Len
To Honda's Killer:
Remember, an expert is just a little drip with pressure behind it.
200mm conversion
Posted: Thu Dec 15, 2022 9:04 am
by QtrVW
Marc wrote: ↑Thu Feb 05, 2004 4:05 pm
Guys, if you don't know the answer don't confuse the guy.
6v flywheels have 109 teeth. They come in both 180mm and 200mm versions.
12V flywheels have 130 induction-hardened teeth (note the blue color) and also come in both clutch sizes, although the 180 was only used on 1200 and 1300 engines, and the US got only 1500 and 1600 motors in 12V so they're rare in this country. The 130-tooth 'wheel is approximately 1/8" larger in outer diameter and won't fit into a 6V bellhousing unless the latter is clearanced slightly.
In mid-`66 the method of sealing the flywheel to the crank was changed from a gasket to an O-ring. The end of the crank was machined further to make room for the O-ring to live (you can put a gasket flywheel on an O-ring crank but not vise-versa). MOST 69 stroke cranks are O-ring, but if they're from an early `66 or a bus they could be gasket. Most 6V flywheels are gasket, but late `66 was O-ring. All 12V flywheels are O-ring.
So, there are:
109-tooth, gasket, 180mm clutch
109-tooth, gasket, 200mm clutch
109-tooth, O-ring, 180mm clutch
109-tooth, O-ring, 200mm clutch
130-tooth, O-ring, 180mm clutch
130-tooth, O-ring, 200mm clutch
36HP and older engines had a smaller diameter crankshaft and the flywheels were different at the center - although they too are 109-tooth, gasket, 180mm clutch.
Re: thanks for the great info, i have a 1966 6v with a 180mm flywheel, if the method of sealing on my car is gasket what modification would i need to do to covert it to a 200mm 12v ?
Re: 200mm conversion
Posted: Mon Jan 13, 2025 3:33 pm
by Phil T. Sanchez
A simple lathe operation on the O-ring "lip" is what's needed: if your 1966 6v crankshaft is std diameter (2.165"), turn the 200mm 12v O-ring flywheel lip ID to 2.1655" - 2.1660".
[/quote]
Re: thanks for the great info, i have a 1966 6v with a 180mm flywheel, if the method of sealing on my car is gasket what modification would i need to do to covert it to a 200mm 12v ?
[/quote]