Print Page - Valve Lapping

Title: Valve Lapping
Post by: NAVRIG on October 20, 2015, 05:03:09 AM

Hello all

Just started having a go at lapping in valves.My question is. When i see examples on you tube etc. it shows a nice circle on the seat and the valve that looks like a grey matte finish. Mine are coming out shiny as though they have been polished. Any thoughts.

Thanks

Title: Re: Valve Lapping
Post by: oldktmdude on October 20, 2015, 06:53:53 AM

They will look polished because that's exactly what you're doing.

Title: Re: Valve Lapping
Post by: NAVRIG on October 20, 2015, 01:44:56 PM

Thanks for your response

I understand that is what I am doing I was just wondering why I am not getting the same look as all the others I have seen . As mentioned before a nice circle that looks grey and a matte looking finish not shiny .

Thanks again

Title: Re: Valve Lapping
Post by: racerrad8 on October 20, 2015, 01:47:18 PM

There is several different grits of lapping compound.

The valve and seat material might polish instead of grind,

As long as you have a nice concentric pattern on the seat and valve you are good to go.

Randy - RPM

Title: Re: Valve Lapping
Post by: NAVRIG on October 20, 2015, 02:11:34 PM

Thanks so much just wanted to be sure

FJowners.com

General Category => Maintenance => Topic started by: NAVRIG on October 20, 2015, 05:03:09 AM