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**Siliespiriulk** · 03-24-2008, 05:09 PM

Been quite a while since I've seen those heads - IIRC, the main problem was getting a durable seal for the combustion pressures - would be great if they were sorted - ceramics, perhaps.
You may wish to have a search for, IIRC, the "POLO" engine which was made primarily of plastics - very light and showed a lot of promise in the early '90s in motorsport.
Have a look for "sleeve valve' and "rotary valve" engines, as well.

03-24-2008, 05:09 PM	#11
Siliespiriulk Join Date Oct 2005 Posts 660 Senior Member	Been quite a while since I've seen those heads - IIRC, the main problem was getting a durable seal for the combustion pressures - would be great if they were sorted - ceramics, perhaps. You may wish to have a search for, IIRC, the "POLO" engine which was made primarily of plastics - very light and showed a lot of promise in the early '90s in motorsport. Have a look for "sleeve valve' and "rotary valve" engines, as well.
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