Muffler port does not match?
- Thread starter Dice1
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Al.Fisherman
Active Member
Are you sure you are trying to mount the muffler to the exhaust port and not the intake port. Both studs have different measurements? I'm assuming you are talking about a Chinese in frame engine. Have you taken the cylinder off and installed it backwards? Installed the intake port points directly aft and the exhaust points at a 11:00 position while sitting on the bike.
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Yep its the right port. Just the flange on the exhaust is round and the head is like a ovaled rectangle like on big block chevys. It runs fine just thinking that like a regular car the ports make a big difference in the smooth flow of the air.
motorpsycho
Active Member
that's just the way they're made, but you can port the exhaust and gasket match the port.
by the way, not all big block chevy engines had rectangular exhaust ports.
the high performance and marine heads have rectangular exhaust ports, and the truck, standard passenger big blocks had oval exhaust ports ports.
the oval port heads were more for low end torque, and the rectangular port heads were more for top end rpm's.
the rectaungular port heads flowed more than the oval port heads.
by the way, not all big block chevy engines had rectangular exhaust ports.
the high performance and marine heads have rectangular exhaust ports, and the truck, standard passenger big blocks had oval exhaust ports ports.
the oval port heads were more for low end torque, and the rectangular port heads were more for top end rpm's.
the rectaungular port heads flowed more than the oval port heads.
HeadSmess
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cus theyre cheap and well, what do you expect? high precision fits on each and every component? look at the flange! its a piece of punched plate barely tack welded to a pipe... and the pipe is narrower than the port!
the ports horrible, anyway. really needs filling in til it actually is round, 18mm or so diameter. if you really want to go chasing horsepower, without affecting exhaust port timing...
the ports horrible, anyway. really needs filling in til it actually is round, 18mm or so diameter. if you really want to go chasing horsepower, without affecting exhaust port timing...
so is it possible to with a decent manifold and pipe match the port? (say18/19mm)cloud_2901
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Saw some really cool laser-cut inlet manifolds for sale on a thread on this site, but that was late 2010, I'm actually interested if they are still around too. . .
Pipe-wise, get a dremel and someone with a steady hand?
Pipe-wise, get a dremel and someone with a steady hand?
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