Scott @ Hillsidecycle
Banned
Joined: Sep 2009
Posts: 3,569
Likes: 624
From: deland,florida
compaired to the same motor with 10.5-1 it is.im not going to get in a pissing match with you,we build ALOT of motors & use ALOT of S&S 585 cams,now maybe by some voodoo crap,they work different in a evo than a TC (never put one in a evo),but they don't like compression under 10.5-1,bigger displacement motors can get away with lower compression(around 10.2-1 or 10.3-1),but not 9.5-1.(don't really care if it came from S&S like that or not)and if its a TUV motor,it is a EPA motor (not USA,but your EPA,whatever that may be)
Last edited by prodrag1320; Jan 5, 2017 at 10:21 AM.
Outstanding HDF Member
Joined: May 2014
Posts: 2,400
Likes: 284
From: Fort Worth, TX
Graham, I am not saying you are wrong (I completely value your opinion on this forum) about the 585 in your EVO, but in a small displacement Twin Cam I agree with Kirby that they will be flat on the bottom without compression. I currently have them in my 95" build in my bagger set to 10.5:1 and they really don't shine until I am up over 3k rpm (3300rmp to be more exact). From there to the redline the bike is a rocket. I am actually going 98", changing the heads and installing some CR575's (will set to 10:1) this winter to move the power significantly to the left. I will gladly sacrifice the HP up top to gain TQ down low...
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,092
Likes: 7,614
From: Poolville
Graham, I am not saying you are wrong (I completely value your opinion on this forum) about the 585 in your EVO, but in a small displacement Twin Cam I agree with Kirby that they will be flat on the bottom without compression. I currently have them in my 95" build in my bagger set to 10.5:1 and they really don't shine until I am up over 3k rpm (3300rmp to be more exact). From there to the redline the bike is a rocket. I am actually going 98", changing the heads and installing some CR575's (will set to 10:1) this winter to move the power significantly to the left. I will gladly sacrifice the HP up top to gain TQ down low...
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
Graham, I am not saying you are wrong (I completely value your opinion on this forum) about the 585 in your EVO, but in a small displacement Twin Cam I agree with Kirby that they will be flat on the bottom without compression. I currently have them in my 95" build in my bagger set to 10.5:1 and they really don't shine until I am up over 3k rpm (3300rmp to be more exact). From there to the redline the bike is a rocket. I am actually going 98", changing the heads and installing some CR575's (will set to 10:1) this winter to move the power significantly to the left. I will gladly sacrifice the HP up top to gain TQ down low...
Banned
Joined: Sep 2009
Posts: 3,569
Likes: 624
From: deland,florida
Im not "arguing" either,just stating where the 585's like to be set as far as compression goes.fact,not just my opinion.if you think your motor.set @9.5-1 isnt flat on the bottom,ide advise you find one set at 10.5-1,im thinking your assessment of your motors power will change
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
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Seasoned HDF Member
Joined: Mar 2010
Posts: 21,092
Likes: 7,614
From: Poolville
Obviously the 585 is a very versatile cam... Good for motors from 88" through 124". Cams will also react differently based on cubic inches. Graham i would love to see a Dyno sheet on a lower compression build..... When i decreased the compression on my Evo and went to a longer stroke, I ended up with a lot more than i thought would get...
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
Obviously the 585 is a very versatile cam... Good for motors from 88" through 124". Cams will also react differently based on cubic inches. Graham i would love to see a Dyno sheet on a lower compression build..... When i decreased the compression on my Evo and went to a longer stroke, I ended up with a lot more than i thought would get...
