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tadd's Avatar
 
Join Date: Dec 2005
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neway seat cutter questions

I have read a few mentions of people using these tools and they seem to be great.

Can anyone comment on what sizes I would need for the 2.2-2.7 valve sizes? Amazon actually lists the buggers, but I have no clue as to how a standard size would match to metric. Is there a better place to buy these? I found the company easy enough but not an online reseller (other than amazon).

I also noticed they make a product (the gizmo) for doing the valves. Is it worth purchasing, or can I just touch up the valves on a lathe? I will be using new valves, I just want to make sure that they are concentric before installing them. I am still toying with a backcut.

Thanks for any help,

tadd
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Old 03-09-2006, 09:54 AM
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you can use neways by hand if you're careful, but they really work best with the neway machine setup. by hand, they tend to leave chatter marks. i worked at a shop eons ago that used them exclusively, by hand, and you developed a feel for them after a while, and they worked fairly well.
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Old 03-09-2006, 10:41 AM
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Yea, I can see that... just like putting a chamfer on a hole. Lite cuts are easy by hand. Chucking the countersink in the tail stock or in the quill makes for much nicer results if it needs to be a deep cut.

tadd
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Building molecues or building cars... you do get more of first in every batch. A mol of porsches anyone?
Old 03-09-2006, 11:49 AM
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I used the 642 and the 272 on 2.7 and 3.2 heads, I dont know what size 2.2 are but I was at the limit on the 2.7 heads, could not go any smaller. The cutters are adjustable for size to a limit, and they sell any size pilot you want even expandable. Call the company and they can send you out a nice product line, I ordered mine direct from them.
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Last edited by cgarr; 03-09-2006 at 12:17 PM..
Old 03-09-2006, 12:13 PM
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Thanks!

cgar:

That is what I needed to know!

The 2.2-2.7s all have the same size valves, so I would assume the seats are all the same size too. Only the port size was changed IIRC.

tadd
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Building molecues or building cars... you do get more of first in every batch. A mol of porsches anyone?
Old 03-09-2006, 12:21 PM
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I see they do have them on Amazon, the 642 is 227.00 you can order it direct from neway for 163.00 unless there is some discount I dont see on Amazon

EDIT: never mind, I see they are drop shipped from Goodson, that explains it
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Last edited by cgarr; 03-09-2006 at 12:45 PM..
Old 03-09-2006, 12:41 PM
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Just to be sure...

Cgarr:
Just CYA here, but I would assume since you list only two cutters that one of them gets 'flipped over' and that one would be the 30/70 degree jobbie?

tadd
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Building molecues or building cars... you do get more of first in every batch. A mol of porsches anyone?
Old 03-09-2006, 05:19 PM
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the 642 does the 46/31 and the 272 is the 75
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Old 03-09-2006, 05:52 PM
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Excellent!

Thank you for your help!

I'll be on the phone tomorrow.

tadd
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Building molecues or building cars... you do get more of first in every batch. A mol of porsches anyone?
Old 03-09-2006, 07:58 PM
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Hey Cgarr.... can you tell me why the book specs the seats cut at 30 and 45 degrees but the cutters are 31 and 46 degrees...
Thanks
Tony
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Old 11-18-2007, 11:38 AM
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To help reduce carbon build up, there is an interference angle (usually 1 degree) between the valve and seat. If I am using old valves that I have to grind then the valves can be ground at 44 degrees and the seats left at 45 degrees but most of the time new valves are used.

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Old 11-18-2007, 12:59 PM
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ahhhh ....Thanks for the explanation and the pictures are really helpfull as I understand better with visuals....If you dont mind me asking where the pics came from as I ahve been researching the internet and ahve not found a good source for this info as of yet.... except yours of course....
Thanks again
Tony
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Old 11-18-2007, 01:37 PM
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