question for - 103 and oil cooler owners
#23
05-29-2011 | 05:44 AM
Road Master
Joined: Aug 2010
Posts: 1,152
Likes: 3
From: Central Ohio
Just want to know if any of the 103 owners that have oil coolers installed are having the starting problems when their bikes are hot. Seems that some 103 owners have problems starting their bikes when hot, and current attention is either higher torque starters or compression release. So to better understand what is happening....it would be helpful to measure if this is a problem with 103 owners that have oil coolers installed. a bike with an oil cooler does not get as hot as a non oil cooler bike. I noticed easier starts when hot on my bike. Thanks for your comments.
mikebaby
Last edited by mikebaby; 05-29-2011 at 05:44 AM. Reason: typo
#25
05-29-2011 | 10:46 AM
Grand HDF Member
Joined: Sep 2009
Posts: 3,757
Likes: 247
From: Green Country Oklahoma
#26
05-29-2011 | 10:56 AM
Outstanding HDF Member
Joined: Nov 2008
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Likes: 127
#27
05-29-2011 | 11:50 AM
Well it appears that the '10 103's have 9.7:1 cpr & '11 103's have 9.6:1 cpr compared to the 96ci's 9.2:1 cpr. This computes to about a 193 psi in cold cranking compression with stock cams. If you install 255's your ccc will rise to 197 psi. These figures are at sea level. As your altitude increases your ccc will decrease. That being said there are other things that can cause hard starts. Does your ignition fire on the first compressing stroke or does it allow your engine to cycle once? Are you at sea level or higher elevation? Is your cpu putting too much fuel in for hot starts? This is something the PC III guys are avoiding by not waiting for the fuel pump to cycle. Some controllers like the T-Max allow you to adjust this. What I can tell you is I have a 107ci with 195psi CCC and an oil cooler and I don't have hard starts when hot w/o the compression releases. I am at 1240 feet above sea level. If I go to San Diego my CCC will rise to 202 psi. At that point I may be glad that I had the compression releases installed.
#28
05-29-2011 | 06:36 PM
Outstanding HDF Member
Joined: Nov 2008
Posts: 2,034
Likes: 127
Well it appears that the '10 103's have 9.7:1 cpr & '11 103's have 9.6:1 cpr compared to the 96ci's 9.2:1 cpr. This computes to about a 193 psi in cold cranking compression with stock cams. These figures are at sea level. As your altitude increases your ccc will decrease. That being said there are other things that can cause hard starts. Does your ignition fire on the first compressing stroke or does it allow your engine to cycle once? Are you at sea level or higher elevation? Is your cpu putting too much fuel in for hot starts? This is something the PC III guys are avoiding by not waiting for the fuel pump to cycle. Some controllers like the T-Max allow you to adjust this. What I can tell you is I have a 107ci with 195psi CCC and an oil cooler and I don't have hard starts when hot w/o the compression releases. I am at 1240 feet above sea level. If I go to San Diego my CCC will rise to 202 psi. At that point I may be glad that I had the compression releases installed.
#30
05-29-2011 | 10:44 PM
Road Warrior
Joined: Aug 2010
Posts: 1,268
Likes: 8
From: Detroit, the asshole of America
It's determined by the intake valve closing point, primarily. Advancing or retarding any cam, including the stock cam, will also move ccp around.