Is s&s 585 a good cam for a103 ultra hows the torque at 2500 rpm thanks for all info!

 

That cam is fantastic, but not the best for low RPM torque.

 

I have read mixed views on that cam. I have a stock S&S V107T which came with it and it runs fine. The bike will run and pull away from well below 2,500rpm, so I wouldn't say it gives poor low torque. My bike has only 9.5:1 CR, which some 'experts' have claimed it won't work with, so perhaps with higher CRs it moves the performance range further up the rev range. Anyway, my engine was built and sold as a touring engine and that cam works very well in that role.

 

I've used both s&s 570 and 585 cam in twin cams and was absolutely loved the way they performed, but again will say they are not the best for low end torque with everything equal. If low end torque is the goal and sticking with just s&s products, other s&s cams will perform better at lower rpms, such as the MR103 and the 551 cams. Again, I love the s&s 585 but dont mind running a little higher rpm's. Per the s&s website, the 585 effective rpm range is 3500 to 6000 for 88 - 103 engines.

 

If your looking for tq at 2500 rpm's , you might want to take a look at a Cyclerama Cam.

 

the S&S 585 cam is a great grind & one we use a lot,but it is a higher RPM cam (3000-6000) and will want 10.5-1-10.8-1 compression,the 570 would more fit your bill as it will make power from 2200-5500 (set it at 10.0-1).wood 6 or Andrews 54 cams would also fit

 

ok that what i was afraid of i ride 2 up alot ! Thanks for everyone info so greatley appreciated.

 

I ride my S&S V107T with 585 cam mostly 2-up, plus full bags and tourpak and it pulls like a freight train! We have two conflicting views here, but I have been riding mine for over 8 years now. It will happily run on a light throttle in top gear at 1,500rpm. The 585 cams are also used in the S&S T111 and low CR T124s, all built for use in touring bikes, with relatively low CRs. Take a look at the S&S website.

 

What compression is your 107" ?

 

I've read your posts on this before. In my last 107 set at 10.5 the 585 cam came on just a tad under 3,000 rpm.

​​​​​​Thats my personal experience with one bike with the 585 cam but I also take the word of reputable engine builders here who have experience with such cams on hundreds of bikes.

With a lower compression like oem, they would and should be very soft down low. Low compression and a late closing cam results in low cylinder pressure down low, smaller combustion explosion and less forces. That's no subjective opinion but fact.

​Perhaps your cam is a 583, you have higher compression than you think or your perception on good performance down low is different than others. Whatever makes you happy although cruising at highway speed in top gear at 1,500 rpm isn't good.