Valve seat materials

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12-09-2016 | 10:49 PM

#61

gnorthga

Registered

Joined: Oct 2007

Posts: 764

Likes: 0

From: Chattanooga, Tn

Quote:

Originally Posted by MILD THUNDER

What kind of valve guide clearance are you running? What cylinder head?

1075 sci merc motors

12-09-2016 | 11:21 PM

#62

getrdunn

Registered

Joined: Feb 2009

Posts: 8,356

Likes: 1,515

From: NW Michigan

Quote:

Originally Posted by SB

Reminds me off the smell of my 2 stroke race engine builder's place.

This guy was so good !

https://www.youtube.com/watch?v=bT1nRq-cM7M

Some funny chit

12-10-2016 | 12:38 AM

#63

Diamond Dave

Registered

Joined: Sep 2014

Posts: 866

Likes: 254

From: Portland, OR

Quote:

Originally Posted by Black Baja

Usually Pennzoil. Cause it's cheap. If I can't get my hands on two stroke oil. I'll dump transmission fluid in instead at 100:1 mix.

Any issue with EFI doing this?

12-10-2016 | 06:07 AM

#64

Black Baja

Registered

Joined: Aug 2011

Posts: 2,733

Likes: 8

From: bel air, md

Quote:

Originally Posted by Diamond Dave

Any issue with EFI doing this?

No. Mercury recommends it in all their high horsepower stuff.

12-28-2016 | 11:47 PM

#65

DRAG

Platinum Member

Joined: Jul 2015

Posts: 482

Likes: 400

From: Danville, IN

Quote:

Originally Posted by MILD THUNDER

Id imagine cutting a basic iron seat is prob alot easier than the harder seats? The cutter speed prob also needs to be compensated too i would think? Im sure they average machine shop doing a set of heads for a weekend camaro , would rather work with an iron seat when doing valve jobs

The hard seats can definitely be harder to cut. I can blast through them on my old Serdi reasonably but I'm now using a Newen contour BB (which I love) and the hard seats can play hell on those cutters. Half of what I cut is copper and the other half is hard powder

Quote:

Originally Posted by dunnitagain

I know how the low seat deal can be a *****! We use a Newen Epoc CNC single point seat cutter. We made a pair of valves with .500 diameter tooling balls sunken in them . Put them in the seats , and measure down with a depth mike . Lowest seat gets cut first . The rest follow suit.

What cutters are you using on your Newen? I'm cutting some hard exhaust seats and getting 40-48 seats cut before I change the cutter. I'd love to double that.