BritBike Forum logo
BritBike Sponsor BritBike Sponsor BritBike Sponsor
BritBike Sponsor

BritBike Sponsor

BritBike Sponsor
BritBike Sponsor BritBike Sponsor BritBike Sponsor
  JWood Auction  
Home | Sponsors, Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons, "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Photo posting tutorial

Member Spotlight
58a10
58a10
texas
Posts: 252
Joined: March 2006
Show All Member Profiles 
Shout Box
Search eBay for motorcycle parts in following countries
Australia, Canada, France, Holland, Italy, United Kingdom, USA
Random Gallery photo
Who's Online Now
220 registered members (57nortonmodel77), 1,642 guests, and 555 spiders.
Key: Admin, Global Mod, Mod
Newest Members
revans, Gilly, XTINCT, Bruce Roberts, Brian Ellery
9959 Registered Users
Top Posters(30 Days)
btour 191
koan58 99
Stuart 86
NickL 73
Popular Topics(Views)
439,034 mail-order LSR
Forum Statistics
Forums33
Topics65,292
Posts632,463
Members9,959
Most Online3,995
Feb 13th, 2017
Like BritBike.com on Facebook

Previous Thread
Next Thread
Print Thread
Rate This Thread
#147698 - 08/30/08 2:34 pm 3-angle valve job question  
Joined: Apr 2004
Posts: 89
John M Offline
BritBike Forum member
John M  Offline
BritBike Forum member

Joined: Apr 2004
Posts: 89
Front Royal, VA
I originally posted this at the end of another thread, but it occurred to me that I would get more answers if I started a new topic. Here is my original post:

John (Healy),

Regarding a three-angle valve job: In my limited experience, it seems impossible to *really* do this for the simple reason that on a Triumph, the valve seat and the valve guide bore are nowhere near Concentric. You can cut a 45* angle, but any 60* angle you try to cut will go maybe half way around the seat before you start cutting into your contact area. And if you tried to cut a 30* angle, you would cut into the aluminum because of the way the factory cut the seats to begin with. Unless you consider the angle between the seat and the chamber as the third angle, of course.

Anyway, I've long been confused as to what people mean by a three-angle valve job on a Triumph, and if there's anyone who knows, it would be you! Please enlighten.

Thanks,

John


latin81@comcast.net
Support Your #1 BritBike Forum!
Membership Type! Free
Member
Premium
Member
Premium Life
Member
Vendor
Member
Site
Sponsor
Recognition No Premium Member Premium Life member (5 years) Vendor Member Site Sponsor Membership
Post commercial threads No No No Yes Yes
Custom title No Yes Yes Yes Yes
Upload avatar & photos No Yes Yes Yes Yes
Link avatar & photos Yes Yes Yes Yes Yes
Private Message Storage: 10 100 100 100 100
Length of signatures 255 600 600 600 600
Removes this very advert island between post 1&2 No Yes Yes Yes Yes
Price Free $12.90/year $105.00 No End
$55.00/5 years
$210.00/year
($17.50/month)
Email
Click on button >>
  Premium Member Premium Life member Vendor Member Site Sponsor Membership
#147699 - 08/30/08 3:25 pm Re: 3-angle valve job question  
Joined: Jan 2004
Posts: 3,517
DMadigan Online content
BritBike Forum member
DMadigan  Online Content
BritBike Forum member

Joined: Jan 2004
Posts: 3,517
ca, us
A three angle (30-45-60) valve grind works if you put the guides in right - with a puller that sits in the seat. If you just pound them in they will likely be off and you will have problems cutting the seat. Since the seats were cast into the head they are likely to be off a bit, some worse than others. You can always cut the head for a new seat that is Concentric with the guide bore.

#147700 - 08/30/08 11:20 pm Re: 3-angle valve job question  
Joined: Jan 2007
Posts: 89
Ton Up Les Offline
BritBike Forum
Ton Up Les  Offline
BritBike Forum

Joined: Jan 2007
Posts: 89
Houston,TX
Using the puller is in fact the best way. I've done many three angle jobs and yes, you do cut the aluminum sometimes. The fifteen deg. cutter helps with this. If you use a Neway cut the 45 first and then lap the valves, even though they say you don't have to, to see where the valve is seating. The you can determine how far you want it from the valves edge (30 deg.) and how much you can open her up (60 deg.)


Life's too short.HAUL ***!!
#147701 - 08/31/08 12:55 am Re: 3-angle valve job question  
Joined: Apr 2004
Posts: 89
John M Offline
BritBike Forum member
John M  Offline
BritBike Forum member

Joined: Apr 2004
Posts: 89
Front Royal, VA
Hi,

On the heads that I have done, I have used a puller with a device that sits in the seat. The problem is that it puts the new guide in exactly the same position as the old guide. I only have to remove a few thousandths to recut the seat, but it's way off center just like the old cut.

I have seen some seats that were 3/16" thick on one side and 1/16" thick on the other, by the way. You couldn't possibly cut a 60* cut without obliterating the seat on the narrow side, unless you want to angle the guide so the valve sits on aluminum. And although most seats aren't that bad, they are all somewhat off. I love my Triumph, but it's easy for me to see how the Japanese came in and ate Britain's lunch.

John


latin81@comcast.net
#147702 - 08/31/08 3:43 am Re: 3-angle valve job question  
Joined: Jan 2004
Posts: 3,517
DMadigan Online content
BritBike Forum member
DMadigan  Online Content
BritBike Forum member

Joined: Jan 2004
Posts: 3,517
ca, us
When you buy your lathe, make a plug with a 45 degree champher that sits in the vavle seat, thread a 1/4-20 rod in, long enough to go through the guide and another 1-1/2 times the guide length. Get a coupling nut (~1" long) and a washer to push the new guide into the head.


Moderated by  John Healy 


Home | Sponsors | Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons | "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.153s Queries: 14 (0.043s) Memory: 0.8174 MB (Peak: 0.9619 MB) Zlib disabled. Server Time: 2017-11-23 16:47:03 UTC