Put in stiffer springs in and you automagically accelerate the valve seat and valve back wear ... it slams into it harder right.
It also will run hotter because valves lose heat by dissipating it into the head at point of contact. That usually happens 3 cycles out of 4. @ 6000 rpm, you're spinning 100 revs a second, aka 50 cycles, and it spends approximately .75 second sitting @ the seat. It takes in heat worth 50 cyles and spends .75 seconds losing it @ steady state. If you  were to make it run 200 revs a second, you would still spend .75 second sitting but take in a 100 cycles worth of heat. Agreed its not linear ... but still it will take in more heat.
Stiffer springs will turn the valve into a tulip if you make it stiff enough to run 20K rpm. Lighter valves are a must, so is springs and so is valves that shed heat better ... dunno the answer man, just saying it gotta shed heat, retain shape under very high seat pressures and be overall in possible to make and use unless you're a formula 1 team.
Cool.
Buddha.

Quote from: machg on April 13, 2009, 06:24:09 PM
I have put a provisional patent in for an engine design based on the mighty GS500 engine. The design runs as a two-stroke on 1 cylinder only, with the other cylinder supplying compressed air for scavenging duties.

Sounds pretty similar to the Scuderi Split Cycle engine: http://en.wikipedia.org/wiki/Scuderi_Engine

Is your built yet?  Or just a design so far?

Quote from: VSG on May 05, 2009, 01:51:32 PM

Quote from: machg on April 13, 2009, 06:24:09 PM
I have put a provisional patent in for an engine design based on the mighty GS500 engine. The design runs as a two-stroke on 1 cylinder only, with the other cylinder supplying compressed air for scavenging duties.

Sounds pretty similar to the Scuderi Split Cycle engine: http://en.wikipedia.org/wiki/Scuderi_Engine

Is your built yet?  Or just a design so far?

Yeah, it looks very similar to the Scuderi  engine, but this is based on an existing engine design. I have done design and provisional patent only at this stage. An attempt at building will require the sourcing of a cheap engine, hence my membership and posting on here. Pnuematic valves would be the ultimate answer to high rpm reliability, but way too costly and complex. To help with heat dissipation of the active cylinder head I was thinking of using a SACS type system as fitted to early GSXRs (using an oil bath around the head, a RGV radiator as an oil radiator {or cooler}, and an upgraded or additional oil pump). In any case; heat might be less of a problem as I would only be running intake valves, all the exhaust heat would be leaving via exhaust ports low in the cylinder wall. Initial build would ignore issues such as valve bounce etc. just getting it running would be a challenge. If I could get it running, performance extraction would be the next priority.

So would you have a larger, higher compression cylinder feeding the power cylinder?