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Engine Mechanical TopicsDiscussion for motor builds, cams, head work, stripped bolts and other engine related issues. The good and the bad. If it goes round and around or up and down, post it here.
My bike:
2003 FXWD (stock) 88
V&H long shots exhaust
K&N High flow air cleaner
Changing the cams to gain low to mid end torque. My current thoughts are one of the following cams: Andrews TW21, S&S 509, S&S 510, SE 204.
I don't plan to do any other work to the bike moving forward. Any thoughts on which one would be the better choice? I'm leaning towards the S&S 509.
FYI, the 21 is not included but the 25 +4 should be pretty close the what the 21 would look like since the profiles are very similar. The biggest difference is that the 21 intake closes at 30* and the 26 closes at 35*. The numbers might help with the OPs decision. One thing the numbers make pretty clear is that the 510 and the 37 probably shouldn't be on the list.
Looking at that djl the 509s would be the way to go. I don't see the Andrews 21s on there, but suspect they are in line with the 509. Would either of these be/feel that much different from each other? If those two cams are that close I would think price would be the determining factor then.
Stock 88" engines were ~8.8:1 compression-adding smaller cams will feel snappier. The best way to improve low/mid torque is a displacement bump. Cast 95" flat tops and a bore job is cheap, and combine a displacement bump with a compression bump, both help with torque.
Last edited by rigidthumper; Aug 8, 2019 at 12:21 PM.
Looking at that djl the 509s would be the way to go. I don't see the Andrews 21s on there, but suspect they are in line with the 509. Would either of these be/feel that much different from each other? If those two cams are that close I would think price would be the determining factor then.
Read the post and look at the 26 +4 results. Rigidthumper is right about a displacement increase. Just going to 98" with say 9.6-9.8 static will feel like a different ride. Add a bolt in cam and another jump in power.
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Cam Help
Rigidthumper is right about a displacement increase. Just going to 98" with say 9.6-9.8 static will feel like a different ride. Add a bolt in cam and another jump in power.