Upping compression?
Sponsor
Joined: Dec 2007
Posts: 12,084
Likes: 829
However this shakes out, a good tune, not an auto-tune, will pull it all togather.
Those canned maps also are like me trying to wear your shoes, and you trying to wear my pants........just don't fit right, and won't get better with time.
Scott
Those canned maps also are like me trying to wear your shoes, and you trying to wear my pants........just don't fit right, and won't get better with time.
Scott
Stage I
Joined: Oct 2025
Posts: 1
Likes: 0
From: Victoria Canada
583 cams & compression
Hello all, new to the hd forums although I've learned quite a bit already I had some questions regarding compression on my 13 dyna fld. Just recently put in a set of S&s 583 easy starts and a powervision tuner but the bike acts like a turd. I have tried like 4 different tunes and she just needs more. My question is there any way to jack compression up to 10.5:1 with a bolt on kit? I don't want to do any machining on it. Before can swap I was hitting around 37-40 mpg and now I'm lucky to get 26. It ran good when we were up north but really lacked on the power side, and we came home to oklahoma with the 103 degree weather and she falls even harder. Not to mention the ping I get down here that I wasn't getting up there. Thanks in advance and I hope to hear all insight, constructive or not all is appreciated.
Propipe (quiet baffles for a little extra torque) and SE high flow air intake, Feuling lifters and Comp adjustable pushrods. I need to drill out the small 12mm bungs and weld-in 18mm bungs to achieve a wide-band tune, which will be done over the winter.
The bike has tons of torque but drops off at 4500 rpm, consistent with the specs on the cam.
I’m thinking of swapping for some Suburban Heads to increase the flow from the stock 215
ish cfm to the 260 they claim as a way to get a bit more umph from the set-up.
I would look to the tune as the culprit as my set up is very responsive in the low to mid range.
if anyone has a comment on adding the Suburban Stage 1 heads let me know…
I may end-up changing the cam to a Woods555
But definitely a new tune in the spring will be in order once the bungs are sorted out.
Last edited by jimmy-t12; Oct 2, 2025 at 09:35 AM.
Road Warrior
Joined: May 2011
Posts: 1,956
Likes: 439
From: florida
I recently added the S&S 583 cams on my 2016 Street glide 103 HO motor. All the research that I’ve done and conversations with experienced bike builders says this cam does not like compression higher than 10:1 because of the early intake close. I had a pretty good tune put into the bike with the Power Vision tuner I bought, complimented by the Vance and Hines 2 into 1
Propipe (quiet baffles for a little extra torque) and SE high flow air intake, Feuling lifters and Comp adjustable pushrods. I need to drill out the small 12mm bungs and weld-in 18mm bungs to achieve a wide-band tune, which will be done over the winter.
The bike has tons of torque but drops off at 4500 rpm, consistent with the specs on the cam.
I’m thinking of swapping for some Suburban Heads to increase the flow from the stock 215
ish cfm to the 260 they claim as a way to get a bit more umph from the set-up.
I would look to the tune as the culprit as my set up is very responsive in the low to mid range.
if anyone has a comment on adding the Suburban Stage 1 heads let me know…
I may end-up changing the cam to a Woods555
But definitely a new tune in the spring will be in order once the bungs are sorted out.
Propipe (quiet baffles for a little extra torque) and SE high flow air intake, Feuling lifters and Comp adjustable pushrods. I need to drill out the small 12mm bungs and weld-in 18mm bungs to achieve a wide-band tune, which will be done over the winter.
The bike has tons of torque but drops off at 4500 rpm, consistent with the specs on the cam.
I’m thinking of swapping for some Suburban Heads to increase the flow from the stock 215
ish cfm to the 260 they claim as a way to get a bit more umph from the set-up.
I would look to the tune as the culprit as my set up is very responsive in the low to mid range.
if anyone has a comment on adding the Suburban Stage 1 heads let me know…
I may end-up changing the cam to a Woods555
But definitely a new tune in the spring will be in order once the bungs are sorted out.
Why do little changes that won’t amount to much. Wout bottom end hassle, verify run out is good then select a nice 107” combo with heads. You can set compression around the cams you like and have power everywhere. Cam only is for M8’s not TC’s. I hate to disagree w Lonewolf but im just thinking of your longer term happiness.
Stellar HDF Member
Joined: Sep 2007
Posts: 2,471
Likes: 681
From: Vancouver Island B.C.
Why do little changes that won’t amount to much. Wout bottom end hassle, verify run out is good then select a nice 107” combo with heads. You can set compression around the cams you like and have power everywhere. Cam only is for M8’s not TC’s. I hate to disagree w Lonewolf but im just thinking of your longer term happiness.
I was trying to keep it low budget. A bigger bore, head work and good cam is way more fun.
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,168
Likes: 7,676
From: Poolville
The 583 cam really is pretty lame in a 103 more suited for a 96"er... The 103 has 9.6:1 static compression and I have experience with the Woods TW5-6 in the 103 and it carries out to 5500 without any issues at all.. It's one of the most underrated cams for stock bolt in cam.. You'd be surprised.. However, if you want real power then there's no replacement for displacement.. 107" or even 110" at 10.8:1 will open a lot of doors for a good cam selection.. How much do you want to spend...
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