Mario_GSXR Posted June 8, 2019 Share Posted June 8, 2019 Hi , Fellas! I have SRAD750carb. Exhaust is stock 4\2\1 + empty end. I think about two ideas. 1. Delete connecting pipe between 2&3 pipes....As i know its mission is delete some range of noise for free(without extra weight an exhaust). But i am sure this is not for free about the power. 2. SOmetimes .. i want to produce new exhaust collector . 4 individual pipes without mixing . and 4 tiny long alu pipes instead the one. In a book about 4stroke nascar\drag cars authors say- they get best result with 4-1-1. even bigger than 1short pipe per 1cyl. Why 4-1-1 is better than system where any cyl works as individual machine. one carb, one exhaust. Quote Link to comment
Mario_GSXR Posted June 8, 2019 Author Share Posted June 8, 2019 And i know about that -4-2-1 is better for whole range , and 4-1-1 gets bonus only at high revs but still something in a middle...... and i like low\middle range on 750carb. Specially when screws sets on minus 3.5-4... Quote Link to comment
markfoggy Posted June 9, 2019 Share Posted June 9, 2019 Collectors usually have benefits from harmonics. The back pressure wave from the closing of another exhaust valve is timed to give a reduction in pressure that helps scavenge exhaust gases at the exhaust outlet and valve. Single pipes can do this, is why megaphones usually have a cone on the end, but if built as a collector, the pipes can be much shorter and you save weight. Quote Link to comment
Mario_GSXR Posted June 12, 2019 Author Share Posted June 12, 2019 On 6/9/2019 at 12:26 PM, markfoggy said: Ok, thanks. DO you mean, i can lost some power if i build 4 single long pipes? with a diameter as standart collector (about 4sm), without megaphones. partly from alu, that dont increase the weight more then little bit. What you think, how will change the character of engine if i just switch stock exhaust onto my own design? Quote Link to comment
dupersunc Posted June 12, 2019 Share Posted June 12, 2019 1 hour ago, Mario_GSXR said: It will run like a bag of shit and loose power through out the rev range. Aluminium exhausts tend to get a bit soft and melt. 2 Quote Link to comment
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