I’ve read on here many times about recommended pumping pressures and that raised my curiosity about what is normal erectile pressure in a penis. You could generate this pressure either by lowering the pressure of the air around the penis with a pump, or by squeezing blood into the penis by jelqing.
My common sense told me that erectile pressure would have to be less than the normal systolic blood pressure so if you assume 120mm/80mm Hg that would result in a maximal pressure of about 5” Hg.
Tonight I decided to research this a little and I came up with the following info.
Based on several studies, the average erectile pressure is on the order of 100 mm or 4” Hg.
However it can exceed that level. The article here describes Phase 4 of an erection as:
Phase 4 is the rigid erection phase. The intracavernous
pressure rises above the systolic pressure as a result of
contraction of the ischiocavernous muscle (surrounding
the corpus cavernosa). There is no flow through the
cavernous artery at this stage.
Interestingly the erectile pressure can exceed the systolic bp although the article does not specify by how much (probably not by too much), but this would give an erectile pressure of 6” or possibly 7”. I also found it very interesting that no blood would be flowing through the cavernous artery at this time.
I’m not sure, but I think that the pressure would be additive in pumping, such that if you had an erection with 4” Hg pressure and you pumped at the same time with 4” Hg then you would have a pressure differential of 8” Hg.
It seems to me that in order to enlarge the penis through pumping or jelqing that one would need to exceed the average pressures present during an erection. I leave it to those more knowledgeable than me to speculate on how much.
The link that I gave above has a lot of interesting info on erection mechanisms.
This study is fairly typical of several that I found that discuss modeling the mechanisms of erections. Note that almost all the models of erection ignore the CS and only deal with the CC.