I in no way meant to question your knowledge. I was pointing out that plastics have been used for years to lower weight and cost. Ford used plastic oil pans in some F-150 V6 engines. There are examples of plastics used internally.Check your info Jeff...
Quote me to me....I said "keep your plastic parts out of my engines." I'm not sure of your mechanical knowledge or abilities, so I'll ask you a question. Where is the the intake manifold? Follow up question: Go anywhere you wish on the internet. Show me one piece of plastic INSIDE a 3800?
Timing gears have used composite teeth on cam sprockets. I have seen these on Chevrolet and Ford engines.
In the mid-1980s, Ford engineers developed a 2.3-liter engine that featured a plastic block, rods and piston skirts. Although the experimental engine was never mass-produced, the Polimotor project proved that plastic could be used as a lightweight alternative to aluminum, cast-iron and steel.
Plastic automotive engine