This particular subject has probably been flogged to death but I can't find the threads. Short of taking my Gray bike apart I can't remember what I did with seat angles. It took me two hours just to find my my blue box of Neway cutters, reams and mandrels! As soon as I called a friend of mine and accused him of stealing them (not returning 'em, actually) he tells me where I had put 'em when he brought them back! :? I'm starting to dislike the under 30 crowd! 
Short of taking the head off of my gray bike (I'm just refurbishing a low mileage one I've got on the shelf) to see, I can't remember what I use to do. I think the setup that worked for me (longivity etc.) was to cut the exhaust at 45 degrees - centered on seat of valve and undercut with a 60 degree cutter to achieve: a. a Seating width approx. 1/3 the valve seat width b. As close to center as possible. The part that's bugging me is I THINK I use to do 3 angle on the intake seat using the old standard 30/46/60 degree cutters. There is just too many automobile engines and dead brain cells between then and now for me to remember. Nor do I know what is the latest "accepted norm". The only info I found so far indicates 45 degree on intake and exhaust. I do seem to remember that I had trouble concerning the 46/45 degree "self-seating" set-up on the exhaust seats with heat transfer and burning but I'm not even friggin' sure it was Nortons that I'm thinking about!
Also, I seem to remember machining a groove in the valve guide to accept an automotive application seal (Pinto?) that had a spring (can't remember proper name) to help hold seal in the groove you cut. Anybody heard of that or am I just making it up? Didn't we have a problem with the valve stem yanking the seal off the guide or something?!? Jeez...nuttin but fog!
:shock:
If there is anything else you guys can think of that I may need to know or remember (cylinder head only for now), pa-leease clue me in. The last time I built a Norton engine was 1985 and I have the dreaded CRS (Can't Remember Squat) desease. Remembering the nuts and bolts seem to be like riding a bicycle but with mods and specs - not so much! I'm trying to avoid those "oh, yea" moments that one has after the fact, when you go "I coulda, shoulda, woulda". I try hard not to should on myself.
Please note that I'm not after a "hobot hopped up hotrod" just effenciency and longivity. :lol:
Thought you guys my like my "fancy" diaphram compressor. Best use of Slowzookie parts I've found!
Mike
"A wise man learns from other's mistakes, a fool learns from his own!"
Short of taking the head off of my gray bike (I'm just refurbishing a low mileage one I've got on the shelf) to see, I can't remember what I use to do. I think the setup that worked for me (longivity etc.) was to cut the exhaust at 45 degrees - centered on seat of valve and undercut with a 60 degree cutter to achieve: a. a Seating width approx. 1/3 the valve seat width b. As close to center as possible. The part that's bugging me is I THINK I use to do 3 angle on the intake seat using the old standard 30/46/60 degree cutters. There is just too many automobile engines and dead brain cells between then and now for me to remember. Nor do I know what is the latest "accepted norm". The only info I found so far indicates 45 degree on intake and exhaust. I do seem to remember that I had trouble concerning the 46/45 degree "self-seating" set-up on the exhaust seats with heat transfer and burning but I'm not even friggin' sure it was Nortons that I'm thinking about!
Also, I seem to remember machining a groove in the valve guide to accept an automotive application seal (Pinto?) that had a spring (can't remember proper name) to help hold seal in the groove you cut. Anybody heard of that or am I just making it up? Didn't we have a problem with the valve stem yanking the seal off the guide or something?!? Jeez...nuttin but fog!
:shock: If there is anything else you guys can think of that I may need to know or remember (cylinder head only for now), pa-leease clue me in. The last time I built a Norton engine was 1985 and I have the dreaded CRS (Can't Remember Squat) desease. Remembering the nuts and bolts seem to be like riding a bicycle but with mods and specs - not so much! I'm trying to avoid those "oh, yea" moments that one has after the fact, when you go "I coulda, shoulda, woulda". I try hard not to should on myself.
Please note that I'm not after a "hobot hopped up hotrod" just effenciency and longivity. :lol:
Thought you guys my like my "fancy" diaphram compressor. Best use of Slowzookie parts I've found!
Mike
"A wise man learns from other's mistakes, a fool learns from his own!"
