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54 Posts
Many thanks to oldopelguy for tip about that Italian carb seller. Now I'm assured I need dual carbs.
My engine plans have changed a bit also. I'll probably have a chance to buy a ported 1.9l head which has been used for racing purposes. However, valves are still normal 42/37 and porting is not extreme. Well, I'll see that tomorrow, but with that price I guess I want at least try it. With a well chosen camshaft street driving should be quite far from impossible... I hope.
But about dual carbs. My primary concern is the room needed for installation. I really wouldn't like to cut and weld the car to have them fit. (Well, there is also another reason. I couldn't do it by myself and I'd have to find someone to do it.)
Are downdrafts dual carbs easier to fit than sidedrafts? Are sidedrafts possible at all without cutting metal? I made some measurements and came to conclusion the downdraft carbs would probably fit if the hood opener bar would be cut (like in http://www.fortunecity.com/silverstone/healey/116/motor-2.html ). Or maybe carbs would fit even with that on, but not air cleaners.
Making intake manifold would probably not be a problem. I could have them custom made. The minimum lenght of sidedraft manifold would be about 4 cm because shorter transition from the circle of carb end to the head port would be very difficult to do with a "wire cutter".. I'm not sure that is the right word for that machine.
Anyway, I guess 4 cm would maybe not be the optimal choice from the viewpoint of torque. Right?
I also thought about putting carbs into different angle than 180 or 90 degrees but that sounds quite stupid because it would probably make the room problem only worse.
Good pictures about dual carb setups, tips about "designing" intake manifold, experiences about fitting duals, etc. are welcome!
Lasse H.
My engine plans have changed a bit also. I'll probably have a chance to buy a ported 1.9l head which has been used for racing purposes. However, valves are still normal 42/37 and porting is not extreme. Well, I'll see that tomorrow, but with that price I guess I want at least try it. With a well chosen camshaft street driving should be quite far from impossible... I hope.
But about dual carbs. My primary concern is the room needed for installation. I really wouldn't like to cut and weld the car to have them fit. (Well, there is also another reason. I couldn't do it by myself and I'd have to find someone to do it.)
Are downdrafts dual carbs easier to fit than sidedrafts? Are sidedrafts possible at all without cutting metal? I made some measurements and came to conclusion the downdraft carbs would probably fit if the hood opener bar would be cut (like in http://www.fortunecity.com/silverstone/healey/116/motor-2.html ). Or maybe carbs would fit even with that on, but not air cleaners.
Making intake manifold would probably not be a problem. I could have them custom made. The minimum lenght of sidedraft manifold would be about 4 cm because shorter transition from the circle of carb end to the head port would be very difficult to do with a "wire cutter".. I'm not sure that is the right word for that machine.
Anyway, I guess 4 cm would maybe not be the optimal choice from the viewpoint of torque. Right?
I also thought about putting carbs into different angle than 180 or 90 degrees but that sounds quite stupid because it would probably make the room problem only worse.
Good pictures about dual carb setups, tips about "designing" intake manifold, experiences about fitting duals, etc. are welcome!
Lasse H.