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Everything Dirt Bike
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Yamaha
In honor of a fallen friend
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<blockquote data-quote="PSJBrock" data-source="post: 128033" data-attributes="member: 1050"><p>I have always wondered what it meant when the pro's said, "these are custom made pipes for our race team from brand X". This always peaked my interest because what made them custom? Materials? Dimensions? Well after doing some research I found the formula used to figure out exhaust header diameter and length. Then I realized that the custom made pipes are custom to each bike and rider. They very from track to track and so on and so forth. </p><p> </p><p>The idea is to figure out what RPM's the motor is going to live at on a certain track or in certain conditions. Then you build the exhaust to make that motor as efficient as you possibly can in that RPM range in which it is operating. Most aftermarket pipes are built to please the masses. So they are designed to work right in the meat of the power band. They make good power on the bottom, more power in the middle and a little power up top. Which for most people that is perfect.</p><p> </p><p>But take this next race we are going to. The Silver State 300 is 370 miles this year. It is mostly wide open two track, so it is a very high speed race. The bike is going to be in the upper RPM range at this race. There is no aftermarket exhaust company that offers a pipe for this type of ridding. WHY, because if you tune the exhaust to help the motor run really efficient on the top it will run like crap on the bottom. Most people would not want that trade off. For us though we will take that. The only time the bike is going to see first and second gear is coming in and leaving the pits. </p><p> </p><p>Take this video for example. This is Robby bell at the San Felipe 250 this weekend. Listen to the bike as it leaves the pits. It sounds like a dog. I know that have really tall gearing on the bike so that is contributing to it to, but listen to it when it is up in the top RPM's you can tell it is still pulling and making power. That is because FMF made them special baja pipes. Like they do for all their teams.</p><p> </p><p>[media=youtube]_KVE65J8e_o[/media]</p><p> </p><p>Here is a picture that I snagged from THR facebook page that confirms my theory. Check out the diameter of the pipe and the hole in the silencer. It is huge. Which is what is needed when the bike is going to live at 8000 + RPM's.</p><p> </p><p>[ATTACH=full]13765[/ATTACH]</p><p> </p><p>I hope I didn't bore you with this long post but just thought I would share with you what I thought.</p></blockquote><p></p>
[QUOTE="PSJBrock, post: 128033, member: 1050"] I have always wondered what it meant when the pro's said, "these are custom made pipes for our race team from brand X". This always peaked my interest because what made them custom? Materials? Dimensions? Well after doing some research I found the formula used to figure out exhaust header diameter and length. Then I realized that the custom made pipes are custom to each bike and rider. They very from track to track and so on and so forth. The idea is to figure out what RPM's the motor is going to live at on a certain track or in certain conditions. Then you build the exhaust to make that motor as efficient as you possibly can in that RPM range in which it is operating. Most aftermarket pipes are built to please the masses. So they are designed to work right in the meat of the power band. They make good power on the bottom, more power in the middle and a little power up top. Which for most people that is perfect. But take this next race we are going to. The Silver State 300 is 370 miles this year. It is mostly wide open two track, so it is a very high speed race. The bike is going to be in the upper RPM range at this race. There is no aftermarket exhaust company that offers a pipe for this type of ridding. WHY, because if you tune the exhaust to help the motor run really efficient on the top it will run like crap on the bottom. Most people would not want that trade off. For us though we will take that. The only time the bike is going to see first and second gear is coming in and leaving the pits. Take this video for example. This is Robby bell at the San Felipe 250 this weekend. Listen to the bike as it leaves the pits. It sounds like a dog. I know that have really tall gearing on the bike so that is contributing to it to, but listen to it when it is up in the top RPM's you can tell it is still pulling and making power. That is because FMF made them special baja pipes. Like they do for all their teams. [media=youtube]_KVE65J8e_o[/media] Here is a picture that I snagged from THR facebook page that confirms my theory. Check out the diameter of the pipe and the hole in the silencer. It is huge. Which is what is needed when the bike is going to live at 8000 + RPM's. [ATTACH=full]13765[/ATTACH] I hope I didn't bore you with this long post but just thought I would share with you what I thought. [/QUOTE]
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In honor of a fallen friend
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