Exhaust spacer

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JChilders

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I bought a new exhaust for my baja 5b. It came with a spacer and there was a spacer with the old exhaust, but the spacer pushed the exhaust out too far. Can I leave the spacer off or does it have some other purpose?
 
Well the point is the surrounding area is a lower temperature making it harder for the heated gasses to come back into the cylinder while keeping air and fuel into the chamber however the aluminum spacer heats up too quickly and becomes useless after 2 mins.
Ya I don't buy that , its not a air curtain like at a fast food place ! plus the velocities are way to high to act that way , again the Dirt bike MFG have 0 spacers , Kart motors 0 spacers , GP old bikes 2 stroke 0 spacers , point me to a paper or something that makes a case for this effect please .

years ago we looked at dry ice cooling intake air but determined that it was only really good for drag racing because it did not last long enough , also you almost had to use screen in the air flow to distribute the cold so ?? .
 
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Ya I don't buy that , its not a air curtain like at a fast food place ! plus the velocities are way to high to act that way , again the Dirt bike MFG have 0 spacers , Kart motors 0 spacers , GP old bikes 2 stroke 0 spacers , point me to a paper or something that makes a case for this effect please .

years ago we looked at dry ice cooling intake air but determined that it was only really good for drag racing because it did not last long enough , also you almost had to use screen in the air flow to distribute the cold so ?? .
This isn't a theory its science. A proven one at that. There is a reason why raceboats do it
 
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