No im not just looking for numbers,My bike is not a CVO but when the crank went south in 2005 EG, I decided to buy the SE CVO 103 kit.From what read they seem to run pretty.It looks like Zippers 575 is a direct bolt in know no clearance problems.I would appreciate any input on this build.Im going to do the timken bearings the bike already has PC 111.Weld the new crank,Do these 103 run hot?
Thanks
A stock 103 (lean) runs hot, but that is to be expected with an air cooled inline V-twin as you increase displacement but not cooling capacity. Thus the decision by H-D way back when to make the oil cooler part of the package, along with synthetic oil. Once you get it tuned properly the temps aren't an issue other than when stuck in traffic. I shut it down when sitting waiting on a long train or for other delays, otherwise you may broil some of your more delicate parts, but I haven't seen any of the issues that heat has created with the 110's. In other words, the heat factor is a non-issue when deciding to do the 103 conversion.
While you're doing this conversion, you need to also upgrade the cam drive and oil pump to the latest type. You definitely need to get rid of the pre-'07 chain tensioners and replace them with the new cam plate,hydraulic tensioners and roller chain. There are two ways to do this, one using '07 model parts and the other using a special kit from H-D designed to utilize the '06 and earlier cams. The choice will affect which cams you order, since '07 cams won't fit the inner cam bearings of the older cases. Most cam companies have what they call conversion cams, which are set up for the new style roller chain drive but have the old style inner bearing journal sizes.
The CVO103 heads have sufficient valve travel to easily handle the .575 lift, so that won't be an issue. You may have to do some minor relieving of the bosses in the case to clear the cam lobes, I believe the instructions with the cams give you the locations and desired clearances.
Of the various choices, my personal opinion is that you are on the right track. The 103 has proven to be a good engine with good performance potential, and most importantly has not had the issues we've all seen with the 110's. I think you will be very happy with your choice.
Jerry
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Topic: CVO 103 (Read 3705 times)