Cam decisions?
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Stage IV
Joined: Oct 2010
Posts: 4
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From: North Carolina
Cam decisions?
I am about to have my 88 ci motor upgraded to a 95 ci. I have the SE high performance heads (vaulve lift is .575"). CR is 10.1:1. I am going with an Andrews gear driven cam. I am looking for recommendations as to which cam to go with. I have looked at the following:
55G
67G
Has anyone had any experience with the 32G?
55G
67G
Has anyone had any experience with the 32G?
HDF Community Team
Joined: Jun 2006
Posts: 12,774
Likes: 2,606
From: san antonio
I have run the 32G in a 107", nice cam, quiet running but more of a mid and upper range cam, could be a bit soft on the bottom in a 95" IMHO. Cams get "smaller" as displacement increases and visa versa. If you have the early SE Performance heads, a great combo is those heads, SE cast flat top pistons, a .030" head gasket and the S&S 570G cams; a consistent 100/100 build with great rideability and dependability. You may have heard of the "Hippo" build, named after the guy that came up with this combination of parts. I don't think S&S makes that grind in anything but a gear drive set, so if you aren't inclined to convert to gears that combo won't work for ya.
The 55 and 67 are definitely mid and upper end cams and you won't start feeling them until near 3000rpms. The 37 is a great 95" cam but may tend to ping with those heads; smallish chambers, like 76cc IIRC; they have been decked about .050". Take a look at the 31, the lower lift version of the 32 and at the 54, also a good choice IMHO; later intake closes and cranking CR will be in the 180psi range.
Those heads are good out of the box but get a tad better with a little cleanup work, bowl blending and a good multi angle valve job.
The 55 and 67 are definitely mid and upper end cams and you won't start feeling them until near 3000rpms. The 37 is a great 95" cam but may tend to ping with those heads; smallish chambers, like 76cc IIRC; they have been decked about .050". Take a look at the 31, the lower lift version of the 32 and at the 54, also a good choice IMHO; later intake closes and cranking CR will be in the 180psi range.
Those heads are good out of the box but get a tad better with a little cleanup work, bowl blending and a good multi angle valve job.
Road Captain
Joined: Jul 2009
Posts: 617
Likes: 4
From: central ny
I am about to have my 88 ci motor upgraded to a 95 ci. I have the SE high performance heads (vaulve lift is .575"). CR is 10.1:1. I am going with an Andrews gear driven cam. I am looking for recommendations as to which cam to go with. I have looked at the following:
55G
67G
Has anyone had any experience with the 32G?
55G
67G
Has anyone had any experience with the 32G?
HDF Community Team
Joined: Jun 2006
Posts: 12,774
Likes: 2,606
From: san antonio
A footnote to #2 and sort of an answer to Big Pete's post.
kwag245 says static CR is 10:1; calculator at 0.00" deck height shows 10.25 but he won't know what it is until he knows the chamber volume and his head gasket thickness. As I pointed out, the SE Performance heads have smallish chambers, 76cc IIRC so nothing but flat tops will work with those heads. Furthermore, the static isn't the controlling factor, corrected and cranking compression based on the intake valve closing will determine what cam will work with this piston/head combination.
kwag245 says static CR is 10:1; calculator at 0.00" deck height shows 10.25 but he won't know what it is until he knows the chamber volume and his head gasket thickness. As I pointed out, the SE Performance heads have smallish chambers, 76cc IIRC so nothing but flat tops will work with those heads. Furthermore, the static isn't the controlling factor, corrected and cranking compression based on the intake valve closing will determine what cam will work with this piston/head combination.
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Stage IV
Joined: Oct 2010
Posts: 4
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From: North Carolina
The heads have a part number 16933-99B. from what I have learned about these heads, they take a certain piston part number 22439-00A. I have these heads and pistons for this upgrade and just wanted some advise as to which cams would work better with this set up. Also, can anyone tell me if my stock carb. will work with this upgrade? My bike is a 2005 Road King 88ci.
HDF Community Team
Joined: Jun 2006
Posts: 12,774
Likes: 2,606
From: san antonio
The heads have a part number 16933-99B. from what I have learned about these heads, they take a certain piston part number 22439-00A. I have these heads and pistons for this upgrade and just wanted some advise as to which cams would work better with this set up. Also, can anyone tell me if my stock carb. will work with this upgrade? My bike is a 2005 Road King 88ci.
If I might be so bold as to suggest that you sell the HTCC heads and port your stockers to run with a set of flat tops all built around the cam of your choice. I think you will be much happier with the results as they are predictable and a good running 95" build is straight forward.
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Ultimate HDF Member
Joined: Feb 2007
Posts: 7,663
Likes: 7
From: Northeast Ohio
I have built a couple of the HTCC setups and they can be difficult to get the quench right, as well as sometimes difficult to tune. I belive that the HTCC pistons are no longer available from HD. I ran the Woods TW5-G in one build and it was a fun ride, producing great torque, and the other was a science project that the customer absolutlely wanted, and he was disappointed.
Sell the HTCC stuff and go with stock heads reworked by a quality shop such as Headquarters or Hillside.
Sell the HTCC stuff and go with stock heads reworked by a quality shop such as Headquarters or Hillside.
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