H-D "PB" cams
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Cruiser
Joined: Oct 2008
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H-D "PB" cams
This is probably a question for someone like "Pinionhead", up until 1971 Sportsters came with what they called "P" cams in them. One of the things that was done to make them go faster was to put in the H-D "PB" cams. Does anyone have any information such as timing/lift specs, etc on these two?
I "have heard" that the Andrews PB+ cams are "the same as" the original HD PB cams. It seems to me that i also have heard that there is a minor improvement, hence the + on the end of the tag. You could check the Andrews web site for specs for the PB+.
http://www.andrewsproducts.com/
http://www.andrewsproducts.com/
Stellar HDF Member
Joined: Feb 2006
Posts: 3,035
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From: Houston Texas
for someone like "Pinionhead"
I think I resent that! Ha-Ha..... probably a fair description though.
Let's shorten it to simply 'pinhead'
Regarding the cam question.......... Yes the P cams were standard issue for a number of years. I do not have the info on the PB cam lift or duration, so I cannot say anything about them except this......
I remember the cams coming out and they were no power increase over the P cams. If they had been you can bet I would have had two sets of them........ one in the engine and the other set as a spare sitting in the toolbox.
My recollection was they were made to operate better in a lower rpm range but that did not convey more power. Just an old man's recollection.
If you can find the lift and duration of the P and the PB it will tell you the difference and which is the better choice for the kind of riding you do........... pg
I think I resent that! Ha-Ha..... probably a fair description though.
Let's shorten it to simply 'pinhead'
Regarding the cam question.......... Yes the P cams were standard issue for a number of years. I do not have the info on the PB cam lift or duration, so I cannot say anything about them except this......
I remember the cams coming out and they were no power increase over the P cams. If they had been you can bet I would have had two sets of them........ one in the engine and the other set as a spare sitting in the toolbox.
My recollection was they were made to operate better in a lower rpm range but that did not convey more power. Just an old man's recollection.
If you can find the lift and duration of the P and the PB it will tell you the difference and which is the better choice for the kind of riding you do........... pg
Road Master
Joined: Aug 2006
Posts: 751
Likes: 6
From: 500 miles south from Artic Circle
Andrews has a spec for these cams:
http://www.andrewsproducts.com/motor...SC_Cams_IH.htm
HD Stock Q (76-85) 10/32 35/7 lift 0.40 0.40
HD Power P (71-85) 30/40 40/30 lift 0.40 0.40
Andrews PB+ 34/40 43/31 lift 0.40 0.41
So PB+ has little agressive timing and in exhaust lift than P but not so much.
http://www.andrewsproducts.com/motor...SC_Cams_IH.htm
HD Stock Q (76-85) 10/32 35/7 lift 0.40 0.40
HD Power P (71-85) 30/40 40/30 lift 0.40 0.40
Andrews PB+ 34/40 43/31 lift 0.40 0.41
So PB+ has little agressive timing and in exhaust lift than P but not so much.
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