Exhaust port spacing/size: 1.6 vs 1.8
07-19-2010, 05:34 PM
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Exhaust port spacing/size: 1.6 vs 1.8
I found this info regarding exhaust port spacing, and want to verify that it's correct.
Link to source.
I also found the 1.6 port measurements here, but so far nothing concrete for the 1.8.
Ultimately, what I'm wanting to do is have the option to cut the flange off a 1.6 tubular manifold and weld on a 1.8 flange if I end up with a 1.8 motor. I have a Mitsu flanged turbo and have found a cheap 1.6 mani for it, but not a 1.8, and was hoping they are close enough that this will work. I know I can buy a Garrett flanged mani for a 1.8 and an adapter plate, but that's still more expensive than doing it as described above if it's at all possible. I have yet to go to the Mazda dealer and overlay the manifold gaskets, but will do that if ultimately I can't find the answer. I figure somebody here will tell me it's not gonna happen though lol.
I also realize I can just swap the turbo flange on a 1.8 Garrett flanged mani, but the cheap 1.6 mani is a really compact log-style.
The intake manifold, exhaust manifold, motor mount brackets and camshafts do not interchange because of the bore spacing differences.
I also found the 1.6 port measurements here, but so far nothing concrete for the 1.8.
Ultimately, what I'm wanting to do is have the option to cut the flange off a 1.6 tubular manifold and weld on a 1.8 flange if I end up with a 1.8 motor. I have a Mitsu flanged turbo and have found a cheap 1.6 mani for it, but not a 1.8, and was hoping they are close enough that this will work. I know I can buy a Garrett flanged mani for a 1.8 and an adapter plate, but that's still more expensive than doing it as described above if it's at all possible. I have yet to go to the Mazda dealer and overlay the manifold gaskets, but will do that if ultimately I can't find the answer. I figure somebody here will tell me it's not gonna happen though lol.
I also realize I can just swap the turbo flange on a 1.8 Garrett flanged mani, but the cheap 1.6 mani is a really compact log-style.
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07-19-2010, 10:58 PM
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Ultimately, what I'm wanting to do is have the option to cut the flange off a 1.6 tubular manifold and weld on a 1.8 flange if I end up with a 1.8 motor. I have a Mitsu flanged turbo and have found a cheap 1.6 mani for it, but not a 1.8, and was hoping they are close enough that this will work. I know I can buy a Garrett flanged mani for a 1.8 and an adapter plate, but that's still more expensive than doing it as described above if it's at all possible. I have yet to go to the Mazda dealer and overlay the manifold gaskets, but will do that if ultimately I can't find the answer. I figure somebody here will tell me it's not gonna happen though lol.
I also realize I can just swap the turbo flange on a 1.8 Garrett flanged mani, but the cheap 1.6 mani is a really compact log-style.
I also realize I can just swap the turbo flange on a 1.8 Garrett flanged mani, but the cheap 1.6 mani is a really compact log-style.
edit:::
Here you can see the gab distance there is.
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my bad!
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