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I say let the cylinder head exhaust port determine primary size. For my riding lawn mower it's got 590cc engine and it has 1 inch OD header. For some reason the 459cc on my stump grinder engine has a 1.25 inch pipe.
Not sure why the smaller engine has a bigger pipe. Both engines run at about the same top speed. They make around 30hp per liter but only at 3,600rpm.
My 1L per cylinder suburban got 1.62 inch headers, it makes about 60hp per L but it also spins a good bit faster than a lawn mower engine, not double the speed but close.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
Last edited by oil pan 4; 10-22-2022 at 02:18 PM..
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