This thread talks a little about how a smaller intake manifold opening (compared to port entry) may be a good thing.
Minimize intake charge reversion.
Stronger intake charge.
Better throttle response.
Too big of a lip is bad and will mess up flow.
Possibly loosing some upper RPM power, for better low end torque and throttle response by not porting the adapter
http://www.clubcobra.com/forums/sma...-manifold-ports-smaller-than-whats-heads.html
---------- Post added at 10:13 AM ---------- Previous post was at 10:05 AM ----------
Manifold Kit, 390 Carb to GX200, 6.5 Chinese OHV, & 212 Predator, 2 pc Adjustable (0/15)
Manifold Kit, 390 Carb to GX200, 6.5 Chinese OHV, & 212 Predator, 2 pc Adjustable (0/15)
Part #: NR-CC390B
Our Price: $27.99
Stock Status: In Stock
Description
Designed to mount GX390 Type Carbs to GX200, 6.5s, and 212 Predators.
2 pc Design can be used on both flat and 15 degree mounts.
Typically requires a 108 Main Jet for std bore Gas GX390 carbs and 110 for Gas Bored Carbs. Methanol carbs will need a 150 to 160 Main or larger.
Pulse Fitting can be installed for operating fuel pumps, otherwise plug can be used to seal opening. NOTE: PULSE FITTING FACES UP Note: On some Long Duration (radical) cams, the intake vacuum signal is too weak to operate the fuel pump, esp when using methanol. In this case, you will need to pulse from the valve cover or block.
Instructions: Mount the 15 degree adapter (the thicker one) to Engine. Mount Flat Plate adapter to the 15 degree adapter. Use a small amount of gasket sealer between the two. Install the carb studs in appropriate holes, mount carb using enclosed gasket, and go racing.
---------- Post added at 10:15 AM ---------- Previous post was at 10:13 AM ----------
Was looking if I needed a second gasket between the two parts of the zero degree adapter. It says use some gasket sealer.
