Not true for all big dogs. My 08 117 only has springs rated to .585 lift.
585 change
- Thread starter myanoch
- Start date
myanoch
Active Member
If you use the stock springs you will be doing the heads over when the springs bind and maybe some new valves also
S&S released a new bhieve spring that will work with a .600 cam
I believe your wasting your time without cutting the jugs you need to move up compression to cover overlap of .600 cam
it's all about combinations
Bigger cams don't work with out doing the whole combination
Use magnets to to hold lifters up
you can check end play by measuring shims and cam and compare to new cam
S&S released a new bhieve spring that will work with a .600 cam
I believe your wasting your time without cutting the jugs you need to move up compression to cover overlap of .600 cam
it's all about combinations
Bigger cams don't work with out doing the whole combination
Use magnets to to hold lifters up
you can check end play by measuring shims and cam and compare to new cam
Attachments
V
Guru
http://www.bigdogbiker.com/forums/motor/24206-new-valve-spring-s-s.html
The new beehive from S&S is a .650 spring.
The current beehive that are in the bikes now (mine is a 08) is the .585 beehive spring, these set ups also do not have the roller tip rockers.
But also as mentioned there is clearance for the .600 cam. Just the stock spring is not rated for this.
I know of .640 cams being run with the proper spring and there is not a clearance issue. I think there are quite a few bikes here with the .640 or greater cams
The roller tip rockers are expensive ($450 a set) but are worth it if you figure the total cost out over your build (but thats just my opinion)
Make corrections as required :lol: V
The new beehive from S&S is a .650 spring.
The current beehive that are in the bikes now (mine is a 08) is the .585 beehive spring, these set ups also do not have the roller tip rockers.
But also as mentioned there is clearance for the .600 cam. Just the stock spring is not rated for this.
I know of .640 cams being run with the proper spring and there is not a clearance issue. I think there are quite a few bikes here with the .640 or greater cams
The roller tip rockers are expensive ($450 a set) but are worth it if you figure the total cost out over your build (but thats just my opinion)
Make corrections as required :lol: V
myanoch
Active Member
I agree with you V 100%
I need to get roller rockers even with the 585 cam
it has less side load on the valve and guide
I spent money on the open belt drive so now i am out of cash
I am also looking at cutting jugs
wondering if it is a problem with pump gas and raising compression to 10.2 or what ever .30 deck cutting makes it
the new springs you said is for .650 cam
they will work on .600 cam installed seat pressure did not look that much higher
I need to get roller rockers even with the 585 cam
it has less side load on the valve and guide
I spent money on the open belt drive so now i am out of cash
I am also looking at cutting jugs
wondering if it is a problem with pump gas and raising compression to 10.2 or what ever .30 deck cutting makes it
the new springs you said is for .650 cam
they will work on .600 cam installed seat pressure did not look that much higher
troppushcet
Member
Yes you can change your cam to a 600 cam without having to change your heads or jugs. I have done this on 06, 07 ,08, 09 and 10s. So your 08 can be done. I found that when your told this from a shop...they just want your money!!! Where the cost really is and you want more performance. you change your nose cone to one that will allow you to add a sensor plate. Eliminating the crank trigger and ignition module and adding a Hi Crane 4 system with a 600 cam will give you what your wanting.
myanoch
Active Member
I disagree you don't need to do anything to your heads or jugs but it won't run well and springs will fail in time
S&S will tell you that
Just to say you have a .600 cam in it
It's not going to make more horse power
The cam overlap will kill it with the low compression and non roller rockers and springs not made for .600 lift cause problems
Most shops know this because they checked for coil bind with those small springs
Its not magic just good maching operiations
Call the people that built the engine S&S won't tell you to put a .600 lift cam in that epa set up
Besides why would you put a cam in too big for the engine combo
Think its going to run better????
S&S will tell you that
Just to say you have a .600 cam in it
It's not going to make more horse power
The cam overlap will kill it with the low compression and non roller rockers and springs not made for .600 lift cause problems
Most shops know this because they checked for coil bind with those small springs
Its not magic just good maching operiations
Call the people that built the engine S&S won't tell you to put a .600 lift cam in that epa set up
Besides why would you put a cam in too big for the engine combo
Think its going to run better????
john sachs
Well-Known Member
IMO,
You're a gambiling man. Changing to the bigger cams,without changing valve springs,is like pissing in the wind. :loony:
It's not a money thing in my shop....It's common sense. :2thumbs:
This is what can happen when you DON'T use sound building practices. :angry:
John
Attachments
john sachs
Well-Known Member
That's a sound building practice...I find many like that. Today you need to check everything.Make up a build sheet,,and work from that. :up:
John
troppushcet
Member
Makes me wonder then the bikes I done this to...which has been many Big Dogs from different states. Have 20,000 miles and more on them. With no problems!! Customers have been very happy with the performance. I do know S&S motors, been building them for years. Like I said before shops just want your money.
V
Guru
Never looked at that. Bad decision on my part (assumsion) figured they used the same tappet block on the 124 as the 117. But as looking thru a 2011 S&S catalog it seems like there is a diff. part number for every pc just about. Good call there :2thumbs:
Ok If you have been following what I did. I put the 585 in my bike.
I just finished painting and putting my tins back on.
I fired it up and adjusted the carb.
I took it for a spin around the block...
It is 40* here and there is snow on the ground but the streets are clear.
I don't know if its because the tire and ground is cold but,it just spins the wheel when you twist the throttle....
It never did that before!!!!
So far I am a happy guy. I will try to fine tune it better when the weather clears. Then I will get it dyno tuned to make sure I am getting the most of the upgrade.
It really was an easy job.
Now maybe I can use a roofing torch to melt this snow.......
I just finished painting and putting my tins back on.
I fired it up and adjusted the carb.
I took it for a spin around the block...
It is 40* here and there is snow on the ground but the streets are clear.
I don't know if its because the tire and ground is cold but,it just spins the wheel when you twist the throttle....
It never did that before!!!!
So far I am a happy guy. I will try to fine tune it better when the weather clears. Then I will get it dyno tuned to make sure I am getting the most of the upgrade.
It really was an easy job.
Now maybe I can use a roofing torch to melt this snow.......
francoblay1
The Spaniard
Brew
Troop Supporter
Contact Mcgroom, he can get you what ya need. He got me all the stuff I needed for my cam change out. I also ordered up some quickie push rods so I don't have to break into my rocker covers in the future in order to change out my push rod cover seals. He'll hook ya up!