KH Valves

Production K Models

Re: KH Valves

Postby Mayday53 » Mon Feb 05, 2018 2:28 am

Thanks. I actually cannot recall whether we use 30 or 45° angle on those. What is the impact difference if stroke and everything else remains the same? Again, as you’ve seen my past posts, I am new to this and still trying to figure it out while trying to get my beautiful machine running.
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Re: KH Valves

Postby EKHKHK56 » Mon Feb 05, 2018 3:37 pm

45° is stock and 30° race. You would know as the 30 is much harder to fit with 45 stock jugs. It will run just fine @45°. Racers are always looking for that tiny extra bit of power and in that respect the 30° angle just flows a bit better due to the shallower angle the gases take after intake stroke starts, and during reversion. More helpful with larger engine, or high revving KR 45" than a stock K.
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Re: KH Valves

Postby xlh59 » Thu Feb 15, 2018 6:06 am

Hi All,

let me join this discussion with similar questions. I have a set of cylinders that also use 1 7/8 intakes and 1 5/8 exhaust valves. The seats are 45° although I thought they are 30° in the beginning. It turned out, that the seats are very small and there is rather a 15° cut only on the exhaust valves to give more room for exhaust gases. From what I understood so far the 45° seats should be kept as converting to 30° is not easy. I think especially if the seats are sunk you dont want to loose that extra material for the 30° seats as the edge between intake and exhaust is already very small with the "big" valves.

Now another question on the valve seats: how much "sunk" is to much "sunk" :) -- can we give a depth of the "wall" next to the valve that is too much? My "wall" is around 0.1" high on the intakes, the exhausts have the 15° angle but I assume its about the same depth.

This is how my seats look like (roughly):
Valve Seats.jpg
Valve Seats.jpg (66.58 KiB) Viewed 7102 times


Is enfield racing the best source for the vaves?

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Re: KH Valves

Postby xlh59 » Thu Apr 12, 2018 4:54 am

Some additional Info on the valve seats from Erik -- THX!
20180406_155039.jpg
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20180406_155114.jpg
20180406_155114.jpg (232.35 KiB) Viewed 6924 times
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