Engine Mechanical Topics Discussion 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.

S&S HP103 as a drop in

Thread Tools
 
Search this Thread
 
  #11  
Old 02-27-2015, 08:56 AM
98hotrodfatboy's Avatar
98hotrodfatboy
98hotrodfatboy is online now
Seasoned HDF Member
Join Date: Mar 2010
Location: Poolville
Posts: 17,629
Received 4,818 Likes on 3,320 Posts
Default if you want more on top........

Originally Posted by FLS103
My bike is a light softail and I only ride one up. The mr103 and 57H look good on the low rpms but I want more up top. May just go ahead and pull the heads when I do the cams

Then do the 57, it will also be a good cam for future upgrades, ie. Heads, pistons etc etc.....likes compression......
 
  #12  
Old 02-27-2015, 01:28 PM
cdonis's Avatar
cdonis
cdonis is offline
Outstanding HDF Member
Join Date: Jul 2013
Location: Escalon ca
Posts: 3,245
Received 296 Likes on 240 Posts
Default

Pulling the heads ? Then go with the hp103, maybe mill the heads, or just a .030 gasket, with a decent head port. Winner!
 
  #13  
Old 02-27-2015, 04:43 PM
usmcbuck's Avatar
usmcbuck
usmcbuck is offline
Tourer
Join Date: Aug 2014
Location: East Texas
Posts: 331
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by pittz5
I've been thinking about pulling my woods 555 and trying the mr103. I'm just concerned about the high lift on stock springs. I know stock spring can handle it but for how long? It looks like a really good cam. Did you do heads when you did cam? Do you have any concerns about the high lift?
pittz, if you're thinking of another cam then there's something that the Woods 555 is lacking somewhere. If so ... what is it?
 
  #14  
Old 02-27-2015, 05:47 PM
qtrracer's Avatar
qtrracer
qtrracer is offline
Ultimate HDF Member
Join Date: Jan 2008
Location: SoCal
Posts: 6,533
Received 131 Likes on 104 Posts
Default

I might try the s&s 510's instead of either the mr or the hp.
 
  #15  
Old 02-27-2015, 09:20 PM
pittz5's Avatar
pittz5
pittz5 is offline
Road Warrior
Join Date: Aug 2008
Posts: 1,318
Likes: 0
Received 26 Likes on 24 Posts
Default

Originally Posted by usmcbuck
pittz, if you're thinking of another cam then there's something that the Woods 555 is lacking somewhere. If so ... what is it?
:-))). There is noting wrong with the 555 I just find myself wanting to try other cams. It's an illness.
 
  #16  
Old 02-27-2015, 09:34 PM
slyedog's Avatar
slyedog
slyedog is offline
Elite HDF Member
Join Date: Aug 2013
Location: Hawkeye state
Posts: 3,789
Received 272 Likes on 185 Posts
Default

Originally Posted by 98hotrodfatboy
Then do the 57, it will also be a good cam for future upgrades, ie. Heads, pistons etc etc.....likes compression......
I don't know where you think the 57 needs compression. A small bump with .027-.030 hea gasket is it. Cam is worthless after 10:1 and 10.25 is pushing it to the far limit. Cam is designed as a stock bolt in with the factory compression 9.6:1. If I decide to big bore later and run anything over 10:1 those cams will be replaced. This is direct from Gary @ Andrews, The King if Cubes, and Axtell when I looked at getting jugs bored to 107". Decided to get my $ out of them 1st. My .02¢ is pick a cam for your current set up or wait and get cams when doing more work and let the builder guide you to what's best for work to be performed.
 
  #17  
Old 02-28-2015, 10:08 AM
FLS103's Avatar
FLS103
FLS103 is offline
Road Warrior
Thread Starter
Join Date: May 2014
Location: Triune, TN
Posts: 1,959
Received 240 Likes on 154 Posts
Default

Originally Posted by cdonis
Pulling the heads ? Then go with the hp103, maybe mill the heads, or just a .030 gasket, with a decent head port. Winner!
Pretty late intake close on the hp103... Bet it would like a good bit of compression. Looks like a good 107" 10.5:1 cam, thats why I cant figure out why the S&S tech guy told me this cam is a drop in for a 103. A stock 103 with this cam would be a turd in low rpm's and the springs would be pushed to the limit when you hit high rpm.
 
  #18  
Old 02-28-2015, 12:52 PM
cdonis's Avatar
cdonis
cdonis is offline
Outstanding HDF Member
Join Date: Jul 2013
Location: Escalon ca
Posts: 3,245
Received 296 Likes on 240 Posts
Default

Originally Posted by FLS103
Pretty late intake close on the hp103... Bet it would like a good bit of compression. Looks like a good 107" 10.5:1 cam, thats why I cant figure out why the S&S tech guy told me this cam is a drop in for a 103. A stock 103 with this cam would be a turd in low rpm's and the springs would be pushed to the limit when you hit high rpm.
103 or 107 with 10 - 10.5 compression would be a winner. The hp 103 only has 575 lift. That is not a concern for the springs. It takes a pretty good build and some $ to have the best of both worlds,low end torque and a high end hp runner. To be honest with you i dont feel im lacking on the top end at all. All the hype about the hp # at 6000 rpm is overrated but a good solid 2500-2800 early pop on the torque that runs out 3000 rpm or a little more is where its at. The mr will easily handle more compression up to a max of 10.5 per s and s too add headwork a even better, alot like the 57, sand s 570, cyclerama 575 ect ect. Whatever you go with post your results and sheet , im interested to see how your ride turns out. Just curious .....you sticking with those pipes?
 

Last edited by cdonis; 02-28-2015 at 01:02 PM.
  #19  
Old 02-28-2015, 02:37 PM
FLS103's Avatar
FLS103
FLS103 is offline
Road Warrior
Thread Starter
Join Date: May 2014
Location: Triune, TN
Posts: 1,959
Received 240 Likes on 154 Posts
Default

Originally Posted by cdonis
103 or 107 with 10 - 10.5 compression would be a winner. The hp 103 only has 575 lift. That is not a concern for the springs. It takes a pretty good build and some $ to have the best of both worlds,low end torque and a high end hp runner. To be honest with you i dont feel im lacking on the top end at all. All the hype about the hp # at 6000 rpm is overrated but a good solid 2500-2800 early pop on the torque that runs out 3000 rpm or a little more is where its at. The mr will easily handle more compression up to a max of 10.5 per s and s too add headwork a even better, alot like the 57, sand s 570, cyclerama 575 ect ect. Whatever you go with post your results and sheet , im interested to see how your ride turns out. Just curious .....you sticking with those pipes?
My pipes are D&D's gonna see how they do. Got rid of the VH big radius a about 6 months ago
 

Last edited by FLS103; 02-28-2015 at 02:39 PM.
  #20  
Old 02-28-2015, 02:39 PM
qtrracer's Avatar
qtrracer
qtrracer is offline
Ultimate HDF Member
Join Date: Jan 2008
Location: SoCal
Posts: 6,533
Received 131 Likes on 104 Posts
Default

Originally Posted by FLS103
My pipes are D&D's gonna see how they do
Fatcat or boarzilla and which baffles are you trying?
 


Quick Reply: S&S HP103 as a drop in



All times are GMT -5. The time now is 06:09 PM.