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Old 02-05-2017, 02:38 PM   #1 (permalink)
oil pan 4
EV convert
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Primary tube length for 305cc engine

Exactly like this : but for a different generator.
Engine is a single cylinder 420cc Briggs and Stratton OHV engine, with 3.54 inch bore and 2.6 inch stroke that runs at 3,600rpm on my Home made solar inverter generator hybrid - EcoRenovator
The exhaust system on my 7kw generator is shaking it's self apart and in the thin air here it struggles to power a reasonable 20 amp load. It's also loud.
I would like to put on a longer exhaust pipe to optimize power, a bigger muffler to quiet it down a little since this generator's engine doesn't run unloaded much.
What would be the ideal length and diameter to maximize power?

One calculator is saying 30 inched for a 3/4 inch pipe.
Another is saying the ideal tube diameter is 1/2 inch. For practicality I'm think I am going to try to stick with 3/4 inch.

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; 02-09-2017 at 04:47 PM.. Reason: Put the correct engine size
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