I used the stock springs. The S&S 475 cam does well with the stock springs and that's what the customer wanted to stick with. I was actually really happy with how it ran with that cam. Not just on the dyno but real world driving on the street too. The 124" big bore kit was just the pistons, pins, rings, head gaskets, and cylinders. The S&S part number is 910-0625. The customer also brought in a screaming eagle Harley 64mm throttle body and I provided the Fueling 6.1 g/s injectors. That was it. What i did leave out of the video is I upgraded the stock clutch with heavy duty springs. They provide 15% more force to the pressure plate. Other than that the clutch was completely stock and took the power and torque just fine although I didn't attempt any drag strip launches.
Thank you very much! Basically just what I was looking for. I'm not a drag racer, I just want more power without buying a new bike. I have the equivalent power adders he has an didn't want to spend the EXTRA 1500$ on parts i already have
Awesome build but why use such mild cam (S&S 475) for a 124 cubic inch big bore kit ... I would have used a 550 or 530 lift cam for that investment ... nonetheless great job!
Thank you for the question! So, you might have missed the first video in this series. The customer already had the S&S 475 cam and D&D exhaust on his stock 107. He wanted to keep those parts if possible. He is a touring guy and added the 124 kit for the torque to pass trucks on the highway without downshifting. He is not a racer or hot rodder in any way. I was interested in the results of the smaller cam myself as I like to experiment. A lot of the times going bigger on the cam can lose low end torque to get gains higher up in the rpm range. Too big of cam and reliability goes away. As it is the S&S 475 is about the biggest you can go with the stock valve springs. As you can see from the dyno results this engine ran very well even with the "smaller" cam and, surprisingly, pulled hard all the way to redline with no drop in power. I was impressed.
Did you end up using the stock springs? Didn't see if you changed them in the last video.. also scouting to see which S&S package he got
I used the stock springs. The S&S 475 cam does well with the stock springs and that's what the customer wanted to stick with. I was actually really happy with how it ran with that cam. Not just on the dyno but real world driving on the street too. The 124" big bore kit was just the pistons, pins, rings, head gaskets, and cylinders. The S&S part number is 910-0625. The customer also brought in a screaming eagle Harley 64mm throttle body and I provided the Fueling 6.1 g/s injectors. That was it. What i did leave out of the video is I upgraded the stock clutch with heavy duty springs. They provide 15% more force to the pressure plate. Other than that the clutch was completely stock and took the power and torque just fine although I didn't attempt any drag strip launches.
Thank you very much! Basically just what I was looking for. I'm not a drag racer, I just want more power without buying a new bike. I have the equivalent power adders he has an didn't want to spend the EXTRA 1500$ on parts i already have
Awesome build but why use such mild cam (S&S 475) for a 124 cubic inch big bore kit ... I would have used a 550 or 530 lift cam for that investment ... nonetheless great job!
Thank you for the question! So, you might have missed the first video in this series. The customer already had the S&S 475 cam and D&D exhaust on his stock 107. He wanted to keep those parts if possible. He is a touring guy and added the 124 kit for the torque to pass trucks on the highway without downshifting. He is not a racer or hot rodder in any way. I was interested in the results of the smaller cam myself as I like to experiment. A lot of the times going bigger on the cam can lose low end torque to get gains higher up in the rpm range. Too big of cam and reliability goes away. As it is the S&S 475 is about the biggest you can go with the stock valve springs. As you can see from the dyno results this engine ran very well even with the "smaller" cam and, surprisingly, pulled hard all the way to redline with no drop in power. I was impressed.