FrontEngineDragsters.Org Forum

Technical => Matt Shaff's Engine Shop => Topic started by: msundstrom on February 10, 2015, 10:43:08 AM

Title: Intake valve stem seals or not
Post by: msundstrom on February 10, 2015, 10:43:08 AM

Intake valve stem seals or not on a NA iron head application. Have run with them both ways and have not seen any advantage or disadvantage as long as VS clearance is good. Experiences, observations?
Thanks
Mark S

Title: Re: Intake valve stem seals or not
Post by: masracingtd1167 on February 10, 2015, 02:42:01 PM

I would say yes to using valve seals because it will help keep oil out of the combustion chamber that can cause detonation .

Title: Re: Intake valve stem seals or not
Post by: wideopen231 on February 17, 2015, 09:05:18 AM

Have never ran seals on race engine. Probably not worst idea just never have.

Title: Re: Intake valve stem seals or not
Post by: Frontenginedragsters on February 17, 2015, 05:43:11 PM

Naturally Aspirated engines have vacuum on the intake side and will want to suck oil down the valve stem.
The exhaust side has lots of heat and pressure pushing the oil up and out of the valve guide.
I would put seals on the intake side and question seals on the exhaust side.

Matt