JonathanEngr
Member
Hi, all! I haven't been on for a bit... I've been having too much fun playing with (my kid's) kart! I really appreciate all of the tips and info that was provided to me at the beginning... it made this quite a pleasure. I also recently (finally!) learned to weld, so you can imagine the add-ons this kart now has... LOL!
The kart runs great. It has a 6.5 HP electric start engine I purchased from Carroll Stream Motor Co., and it still cranks on the first rotation every time. However, when going uphill slightly, the kart doesn't seem to have enough power to wind out the torque converter. Thus, it is MUCH slower going up even slight hills.
I don't want a 50 mph screamer.... not at all. But is there something I can do to increase the power slightly that might help it engage the variable gearing on the TC going uphill? I've heard that changing out the exhaust sometimes will give you another HP or so. I read the appropriately named "Exhaustive Guide to Exhaust", and I'm more concerned with making it perform worse. I *do* want to change out the exhaust regardless, as the exhaust on the CS engine doesn't allow me to place the battery in the battery tray frame (the exhaust comes out right at it, which concerns me). How would I go about choosing the right exhaust tube size and muffler? From what I could see, there were no general guides in the stickied forum other than "You don't want the pipe to be too big, as it slows the exhaust velocity too much. At the same time, a larger pipe eliminates backpressure, which is a good thing."
I'm a practicing Civil Engineer, and one of the things I design frequently is pressure pipe systems. I'm completely understand the relationship between velocity and pressure, and of course, in water systems, a bigger pipe is always better to keep velocity low to keep friction losses down. Thus, keeping the exhaust pipe large to eliminate backpressure makes perfect sense, but the velocity has me a bit confused. It seems it would be more of a volumetric situation to me (I'll explain my thoughts in detail if someone is curious). Anyway... any recommendations on exhaust modifications, and would it help? I see all types of exhaust headers to connect to the block, and all types of mufflers to go with the header. Also--I don't want to make the exhaust any louder...
Other than exhaust, what are some other ways to get another HP or two out of the engine? I would prefer to do no internal mods as the engine runs great as it is. But... if it's the only way to do it I'll gladly listen to any suggestions. Thanks!
The kart runs great. It has a 6.5 HP electric start engine I purchased from Carroll Stream Motor Co., and it still cranks on the first rotation every time. However, when going uphill slightly, the kart doesn't seem to have enough power to wind out the torque converter. Thus, it is MUCH slower going up even slight hills.
I don't want a 50 mph screamer.... not at all. But is there something I can do to increase the power slightly that might help it engage the variable gearing on the TC going uphill? I've heard that changing out the exhaust sometimes will give you another HP or so. I read the appropriately named "Exhaustive Guide to Exhaust", and I'm more concerned with making it perform worse. I *do* want to change out the exhaust regardless, as the exhaust on the CS engine doesn't allow me to place the battery in the battery tray frame (the exhaust comes out right at it, which concerns me). How would I go about choosing the right exhaust tube size and muffler? From what I could see, there were no general guides in the stickied forum other than "You don't want the pipe to be too big, as it slows the exhaust velocity too much. At the same time, a larger pipe eliminates backpressure, which is a good thing."
I'm a practicing Civil Engineer, and one of the things I design frequently is pressure pipe systems. I'm completely understand the relationship between velocity and pressure, and of course, in water systems, a bigger pipe is always better to keep velocity low to keep friction losses down. Thus, keeping the exhaust pipe large to eliminate backpressure makes perfect sense, but the velocity has me a bit confused. It seems it would be more of a volumetric situation to me (I'll explain my thoughts in detail if someone is curious). Anyway... any recommendations on exhaust modifications, and would it help? I see all types of exhaust headers to connect to the block, and all types of mufflers to go with the header. Also--I don't want to make the exhaust any louder...
Other than exhaust, what are some other ways to get another HP or two out of the engine? I would prefer to do no internal mods as the engine runs great as it is. But... if it's the only way to do it I'll gladly listen to any suggestions. Thanks!
), you can bore it out if you have a set of precision drills or buy a larger one, your choice...
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