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Valve rotators

General engine tech -- Drag Racing to Circle Track

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travis
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Valve rotators

Post by travis » Thu Oct 31, 2019 5:44 pm

I’ve got a set of heads with intake and exhaust rotators. For a very mild under 5000 rpm build where longevity is more important than outright power, are the rotators a bad idea? Spring pressure will be a bit higher than stock but nothing crazy (hft application). Do the rotators still work properly with a little more spring pressure?

Also...are the valve locks different with the rotators?

jed
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Re: Valve rotators

Post by jed » Thu Oct 31, 2019 6:49 pm

Most cam company's say don't use them with performance cams. However I have seen them used with
mild performance cam with no apparent problems. I would not use them.
Valve locks are the same

PRH
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Re: Valve rotators

Post by PRH » Fri Nov 01, 2019 10:03 am

The story I heard is...... not needed with unleaded fuel.

True or not? No idea.

But...... I have seen way more failed rotators than retainers....... and none of the common modern gas powered stuff seems to use them anymore.

I usually get rid of them myself.
Somewhat handy with a die grinder.

Dan Timberlake
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Re: Valve rotators

Post by Dan Timberlake » Fri Nov 01, 2019 12:47 pm

what heads ? what valve seats?

Cubic_Cleveland
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Re: Valve rotators

Post by Cubic_Cleveland » Sat Nov 02, 2019 4:30 pm

What are you guys using when getting rid of exhaust rotators on SBC heads which have a corresponding taller spring installed height?

Walter R. Malik
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Re: Valve rotators

Post by Walter R. Malik » Sat Nov 02, 2019 5:42 pm

Cubic_Cleveland wrote:
Sat Nov 02, 2019 4:30 pm
What are you guys using when getting rid of exhaust rotators on SBC heads which have a corresponding taller spring installed height?
Lots of companies offer a .100" taller free height 1.260" O.D. valve spring.
Although, some Chevy heads use a shorter spring on the exhaust side when using the rotator.
http://www.rmcompetition.com
Specialty engine building at its finest.

Cubic_Cleveland
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Re: Valve rotators

Post by Cubic_Cleveland » Sat Nov 02, 2019 6:43 pm

Walter R. Malik wrote:
Sat Nov 02, 2019 5:42 pm
Cubic_Cleveland wrote:
Sat Nov 02, 2019 4:30 pm
What are you guys using when getting rid of exhaust rotators on SBC heads which have a corresponding taller spring installed height?
Lots of companies offer a .100" taller free height 1.260" O.D. valve spring.
Although, some Chevy heads use a shorter spring on the exhaust side when using the rotator.
Thanks Walter

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