new member w/ questions
#1
#2
#3
Welcome to the forum from the sunny (but not today)) Okanagan.
I have zero knowledge on pistons,,,, but here's a little light reading for you on cams:
Fuel Moto M8 Cam Tests
https://www.hdforums.com/forum/milwa...m-testing.html
$tonecold and Steve Cole Cam Testing
https://www.hdforums.com/forum/milwa...m-testing.html
I have zero knowledge on pistons,,,, but here's a little light reading for you on cams:
Fuel Moto M8 Cam Tests
https://www.hdforums.com/forum/milwa...m-testing.html
$tonecold and Steve Cole Cam Testing
https://www.hdforums.com/forum/milwa...m-testing.html
#4
#5
There is some concern with cylinder pressures when using the 11.1:1 compression ratio. The thing I look at is the factory is putting 10.5:1 compression pistons in with the stock cam which closes the intake valves at 1 degree ABDC. This calculates to a CCP of 227 psi. If you go with 11.1:1 and use a cam that closes the intakes at 15 degrees ABDC you're looking at cylinder pressures in the 238 psi range. Can the M8 handle it, possibly. Reducing the compression to 10.75 with a cam that closes the intakes at 15 degrees ABDC gets the cylinder pressures back down to 229 psi which even the factory thinks is fine. So you have quite a few cams to choose from if you go either way. With the 10.75:1 you could use the RS468, CR460, TTS150, WM8 22X to name a few. If you go with the 11.1:1 the S&S 475, WM8 222, WM8 999, WM8 408, TTS200 would all work well. With all but the S&S 475 & WM8 222 you would need to change to high lift valve springs. There are other cams out there that produce decent power. If you're willing to take a chance you could use the cams that close at 15 degrees or close to it with the higher compression ratio. This motor may well handle it just fine. Until someone tries it and get some miles on it without problems we won't know for sure.
The following users liked this post:
jsrracing (09-23-2018)
#6
I have done a bit of reading and using the stock bore is out just not enough there to spec right . Im going to have the seats in the heads replaced the oil pump and cam plate and go with the 117 from fuel moto with the 777 cam and 10.8 :1 they were very helpful in helping me figure out what i wanted for my riding style . thanks for all that responded .
#7
I have done a bit of reading and using the stock bore is out just not enough there to spec right . Im going to have the seats in the heads replaced the oil pump and cam plate and go with the 117 from fuel moto with the 777 cam and 10.8 :1 they were very helpful in helping me figure out what i wanted for my riding style . thanks for all that responded .
It comes on much quicker with a 2-1 exhaust, but so would my bike. I don't know how much riding you do at above 5000 rpm, but I would consider the 22x cam if you like low end power or bump the compression to 11.1:1 and go with the WM8 408 cam. It's not as soft as the 777 down low and it looks like it has a flatter torque curve so it carries the power out. It also looks like it will make more power all the way around than the 777. The 408 requires valve springs for a higher lift, but if you're doing the heads anyway the valve springs aren't much more. The S&S springs are about $300, I think Wood springs are about the same. Going with the high lift springs will give you many more options for cams. Just my thoughts.
The following users liked this post:
jsrracing (09-23-2018)
Trending Topics
#8
Thread
Thread Starter
Forum
Replies
Last Post
LA_Dog
Softail Models
30
04-11-2020 10:07 PM
blksoftail
Exhaust System Topics
7
07-15-2011 11:30 AM