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Need to decide on head work for boosted motor
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<blockquote data-quote="RPM4DAZ" data-source="post: 13242169" data-attributes="member: 54154"><p>I don't know how strict emissions testing is in Mass. But, here in Cal. it is the strictest in the states. There are cam profiles out there that easily go through emissions testing if installed correctly. Aftermarket cams are far better than the factory slow motion ramps. As to your main question. Anytime cylinder head efficiency has been raised it will benefit the assembly. Whether it is normally aspirated or force inducted. When force inducted though, the need to get every little amount of cfm is really not "needed". The pressurized air helps to cover up some inefficiencies in port design/shape. Doesn't cure them, but does help. I myself, am a big valve guy. I believe in running the biggest valves I can and open the bowl areas first. Then if the need arises the rest of the port can be opened to match. In the design of our heads the bowl and the valves are our biggest concerns. Are you planning on using the stock exhaust manifolds? Stock factory cats? What can you get away with as far as cats in Mass? Those are probably your biggest chocking points... My suggestion is to have a good known head porter work the heads as stated above and get a good mild set of cams leaning towards letting the exhaust side breathe. Something say in the 215' @ .050" mark on the intake and about another 10 degrees of duration on the exhaust installed on a 112' l/sep +0'. It would run really nice, idle smooth @ 750-800rpm and the sniffer wouldn't even know... Also, the benefit of above would allow better engine breathing thus allowing a person to spin the blower slower. You have less heat in the air and greater efficiency. You can only spin the blower so fast... Oh, I almost forgot, run your compression around the stock 9.8:1 level. It won't hurt any. In fact it will help keep part throttle torque up and help with the emissions. Not to mention that it will respond more to small amounts of manifold pressure better!!!</p></blockquote><p></p>
[QUOTE="RPM4DAZ, post: 13242169, member: 54154"] I don't know how strict emissions testing is in Mass. But, here in Cal. it is the strictest in the states. There are cam profiles out there that easily go through emissions testing if installed correctly. Aftermarket cams are far better than the factory slow motion ramps. As to your main question. Anytime cylinder head efficiency has been raised it will benefit the assembly. Whether it is normally aspirated or force inducted. When force inducted though, the need to get every little amount of cfm is really not "needed". The pressurized air helps to cover up some inefficiencies in port design/shape. Doesn't cure them, but does help. I myself, am a big valve guy. I believe in running the biggest valves I can and open the bowl areas first. Then if the need arises the rest of the port can be opened to match. In the design of our heads the bowl and the valves are our biggest concerns. Are you planning on using the stock exhaust manifolds? Stock factory cats? What can you get away with as far as cats in Mass? Those are probably your biggest chocking points... My suggestion is to have a good known head porter work the heads as stated above and get a good mild set of cams leaning towards letting the exhaust side breathe. Something say in the 215' @ .050" mark on the intake and about another 10 degrees of duration on the exhaust installed on a 112' l/sep +0'. It would run really nice, idle smooth @ 750-800rpm and the sniffer wouldn't even know... Also, the benefit of above would allow better engine breathing thus allowing a person to spin the blower slower. You have less heat in the air and greater efficiency. You can only spin the blower so fast... Oh, I almost forgot, run your compression around the stock 9.8:1 level. It won't hurt any. In fact it will help keep part throttle torque up and help with the emissions. Not to mention that it will respond more to small amounts of manifold pressure better!!! [/QUOTE]
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Need to decide on head work for boosted motor
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