So in my Advanced Theory of High Performance Heads class we have one final project; to write a small review about a forum discussion that has to do with increasing the performance of the head(s) of the engine. We were originally told we could only use SpeedTalk but since I'm the only person in my class who likes anything other than small block chevrolets my instructor said that I could use you guys here at SupraMania. I also figured this information could benefit me in the future when I start my 7M-GTE build. So here's my question for you guys:
With many heads that use 4 valve combustion chambers a popular modification is a Polyquad set up. This is when you oversize one of the intake valves and the exhaust valve diagonally across from it. The purpose is to allow increased flow of air through the intake valve and better removal of exhaust gases in the combustion chamber. They also help to increase the "swirl" effect in the air flow for the intake side. The reason you only do one of each is to help with any clearance issues so none of the valves can hit each other and cause damage to each other.
Some people say it is better to just simply increase the intake valves and leave the exhaust valves alone. Or is it possible to increase all 4 of the valves without causing damage to the head by hitting the water jacket or having valves contact each other?
What would be the best option for the 7M-GTE head? What are some of your personal experiences with anything like this? Has anyone ever put the heads on a dry flow bench to find what CFM they flow with each of these set ups?
Any and all answers would be greatly appreciated.
With many heads that use 4 valve combustion chambers a popular modification is a Polyquad set up. This is when you oversize one of the intake valves and the exhaust valve diagonally across from it. The purpose is to allow increased flow of air through the intake valve and better removal of exhaust gases in the combustion chamber. They also help to increase the "swirl" effect in the air flow for the intake side. The reason you only do one of each is to help with any clearance issues so none of the valves can hit each other and cause damage to each other.
Some people say it is better to just simply increase the intake valves and leave the exhaust valves alone. Or is it possible to increase all 4 of the valves without causing damage to the head by hitting the water jacket or having valves contact each other?
What would be the best option for the 7M-GTE head? What are some of your personal experiences with anything like this? Has anyone ever put the heads on a dry flow bench to find what CFM they flow with each of these set ups?
Any and all answers would be greatly appreciated.
That's the one thing I'm extremely curious about with these heads. But other than that it has some great info that I can use. Thanks!
