Richmrf Posted March 21, 2013 Report Share Posted March 21, 2013 Sent from my iPad using Tapatalk HD Quote Link to comment Share on other sites More sharing options...
m671054 Posted March 21, 2013 Report Share Posted March 21, 2013 Why? Quote Link to comment Share on other sites More sharing options...
Nightmare Posted March 21, 2013 Report Share Posted March 21, 2013 Huh Sent from my SGH-T679 using Tapatalk 2 Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted March 21, 2013 Report Share Posted March 21, 2013 You would need to first say what your current compression is? And then what else is done to the cylinders? Quote Link to comment Share on other sites More sharing options...
Richmrf Posted March 22, 2013 Author Report Share Posted March 22, 2013 My bad and I apologize. I have no idea what the compression is. I just figured someone would have a close estimate on how much compression milling the head down 50 thousandths would add. Then after that, match that increase in compression, to how much compression the different size domes would increase it. The work done to the cylinders would play no factor in this equation. They are a constant. I'm only changing the head. Cylinders will be staying the same. For example if I had a stock head, that wasn't milled down at all, I would use 22cc domes to keep the same compression. The fact that it is ported and polished has the same effect as the extended A arms,. Right? I'm sure someone out there has an idea how many cc domes is damn near the same as a head milled 50 thousandths. Sent from my iPad using Tapatalk HD Sent from my iPad using Tapatalk HD Quote Link to comment Share on other sites More sharing options...
Richmrf Posted March 22, 2013 Author Report Share Posted March 22, 2013 Why? I would like to switch to my coolhead, and I can barely run pump gas as it is. If anything, I would like to lose a little compression. Sent from my iPad using Tapatalk HD Quote Link to comment Share on other sites More sharing options...
Jereme6655 Posted March 22, 2013 Report Share Posted March 22, 2013 actually porting a motor DOES have an effect on the compression. When the cylinders are ported, the port timings are adjusted according to what type of port job is done to your motor.....which will actually drop your compression. So say taking a stock bike and putting say 22cc domes in a cool head may get you "x" compression.....but after a port job your compression would be less..... So to help with what your asking.....we would need some of the following info: Is it ported (and what kind of port by who) what your current setup is what your elevation is (as compression decreases with elevation) and what your current compression is along with what your trying to achieve (as in making it safer to run on straight pump fuel) Quote Link to comment Share on other sites More sharing options...
sprinklerman Posted March 22, 2013 Report Share Posted March 22, 2013 Just love it when people ask questions but already know more than the people answering them. haha. People will help you if you provide the info requested. Quote Link to comment Share on other sites More sharing options...
m671054 Posted March 22, 2013 Report Share Posted March 22, 2013 Also learn how to word your question better. sounds like your not milling shit. sounds like you have a head milled .050 and want to switch to a coolhead but dont know what domes to buy. i rec you cc what you have and get back to us. how do you know you dont jave a cut and rechambered head Quote Link to comment Share on other sites More sharing options...
Richmrf Posted March 22, 2013 Author Report Share Posted March 22, 2013 Also learn how to word your question better. sounds like your not milling shit. sounds like you have a head milled .050 and want to switch to a coolhead but dont know what domes to buy. i rec you cc what you have and get back to us. how do you know you dont jave a cut and rechambered head Your right, I'm not milling. The milling has been done by Sam Co in SD CA. I have a milled head and want to buy the correct domes for a coolhead. I just want to take the head that has been milled 50 thousandths and swap to the coolhead and keep the same compression. The cylinders have been Dune ported and polished. Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted March 22, 2013 Report Share Posted March 22, 2013 So, with as little saracasm as possible..... Why would you ask a question, then when someone asks you the info needed to determine the answer you make it clear you are more then knowledgable in the situation? When clearly your response is really just an uneducated regurgitation of bits and pieces of knowledge you have picked up here and there. You should also note your elevation as well, or is that another one of those constants? Quote Link to comment Share on other sites More sharing options...
possum Posted March 22, 2013 Report Share Posted March 22, 2013 toss in 17cc domes and run it. Quote Link to comment Share on other sites More sharing options...
Richmrf Posted March 22, 2013 Author Report Share Posted March 22, 2013 actually porting a motor DOES have an effect on the compression. When the cylinders are ported, the port timings are adjusted according to what type of port job is done to your motor.....which will actually drop your compression. So say taking a stock bike and putting say 22cc domes in a cool head may get you "x" compression.....but after a port job your compression would be less..... So to help with what your asking.....we would need some of the following info: Is it ported (and what kind of port by who) what your current setup is what your elevation is (as compression decreases with elevation) and what your current compression is along with what your trying to achieve (as in making it safer to run on straight pump fuel) I really am sorry guys. I know that everything changes my compression, But when I take the milled head off and put on the coolhead with ??cc domes. The compression will be the same. Nothing has been done to the head that is on there except that it was milled 50. A head milled 50thousandths = a NOSS coolhead with ??cc domes. If it helps, lets just say the bike is stock with just a milled head. What size domes should I buy for my coolhead that is sitting on my work bench? M671054 Quote Link to comment Share on other sites More sharing options...
Richmrf Posted March 22, 2013 Author Report Share Posted March 22, 2013 toss in 17cc domes and run it. Thanks Quote Link to comment Share on other sites More sharing options...
Richmrf Posted March 22, 2013 Author Report Share Posted March 22, 2013 A stock head milled 50 thousandths = NOSS cool head with ??cc domes Quote Link to comment Share on other sites More sharing options...
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