Posted by Mike1972chev on February 15, 2012 at 03:22:57 from (75.149.81.173):
In Reply to: fire crater or step head posted by Roger Tomfohrde on February 14, 2012 at 16:27:33:
I agree with all below statements,
In our drag motors,we have always strived to use the flattest topped piston we can get away with.
What has been stated already,the only reason for a domed piston is to increase compression.In some of the newest Pro Stock engines I have got to be around,The dome is getting almost un noticable,compared to that big LUMP that used to be on them 30 yrs ago !!!!! There is kind of an art to getting a good,effecient combustion chamber.If you raise compression VIA a piston dome,you start having issues with flame travel,scavenging,ect.If you start raising compression VIA reduction of combustion chamber around the valves,you start diminishing the flow characteristics of the heads from "shrouding "the valves.Let alone cam profiles,valve diameter,ect. WAY too much details to post on here,and this is WAY long winded answer,probably alot irrelevant! lol
I know we are talking about older,lower RPM tractor engines here,but the same applies.
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