Bigger valves also have more area to absorb heat. I don't think that works out on favor of larger valves. Also stem area remains the same. That works out in favor of smaller valves. You can also take care in grinding seats to increase heat transfer area. On Jul 4, 2015 6:04 PM, "Mike Stirewalt via KRnet" <krnet at list.krnet.org> wrote:
> > > "Big valves serve no purpose in this application" > > Actually they do, particularly the exhaust valve. The majority of the > heat absorbed by the valve is transmitted to the head through contact > with the seat. The larger that surface the better the heat transfer. > What heat doesn't get transferred through the seat interface migrates up > the stem, cokes the oil that lubricates the stem in the guides, causes > sticking and an eventual burned valve. Anything that helps keep cylinder > temps low is going to contribute to a more reliable and longer-lived > engine. Whether with oversized valves or OE valves, taking great care to > optimize the valve and valve seat interface is one of several factors > that differentiates between a well-done valve job and a buggyshop valve > job. Mark's documentation of this process with the Corvair is essential > reading. > > ____________________________________________________________ > Old School Yearbook Pics > View Class Yearbooks Online Free. Search by School & Year. Look Now! > http://thirdpartyoffers.juno.com/TGL3141/5598664fbe229664f18a3st04vuc > > _______________________________________________ > Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. > To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org > please see other KRnet info at http://www.krnet.org/info.html > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options >
