Is it possible to get a good power and flow between the heads, motor and exhaust while being restricted to a 1 1/2" exhaust system on a 2110? I would like to include heater boxes on my build. Are the heater boxes going to restrict the flow and rob enough power to make a difference?
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That engine size is kind of between sizes. Generally, if you drive around under 5500 RPM, a 1 1/2 header will work well and have slightly better torque too, if you're shooting for higher revs and more top end power, a 1 5/8 header is about right.
Any non-stock heater box is just a j-tube internally. No different than running without heater boxes so there isn't any extra flow restrictions. Most non-stock heater boxes don't have any fins between the j-tube and outer case though so the heat output is reduced from stock.
As Justin mentioned, a 1.5" is near the limit on a healthy 2110 engine. With my original 2110 build I went with a custom built 1 5/8" merged header and heater boxes. At the time no one sold 1 5/8" heater boxes, so I had them custom made (big $$$$), but they are now available through a number of venders, so if in doubt go with the 1 5/8s.
Mine, like all the aftermarket big heater boxes, is hollow, so the heat is warm, but not hot. It's enough to keep the cabin temperatures tolerable, with the top up, in near freezing temperatures. Good enough for me.
Ron
