there is only 1 still being produced that I know of.... I'm sorry if I led you astray.... you were asking about flow rates... so I assumed you were asking if it was a problem.
Jamie/Martys at superxparts. Jamie has verified with his own eyes multiple times it drops oil temps 40 degrees... and it has to have a fan (included).
I don't know who Pat Ryan is..... but I'm old.... he may or may not still be involved with the X community. ...
Frank Cottone (sp?) built/designed/sold one that I believe is the same as the NFP (not for profit) oil cooler, that quite a few X's are running. It is fan assist also. It had a temp sensor that would turn on the fan as needed. I don't believe Frank is involved with X community anymore.... I haven't seen him post for quite a while... And I'm pretty sure no one is making them any more, but it wouldn't surprise me if one were to show up on ebay occasionally.
Ive heard the term east coast coolers but I don't know which one it refered to...
the 3rd is the OEM cooler.... at least that I know about... there are some that appear on Ebay time to time. it was .... well lets just say it was ineffective as used/designed.
The fan assisted oil coolers were one of the biggest leaps for longivity of our Xs... In the early days 99-2001, they were finding Xs running temps 285 farenheit at the crank and heads. After the oil coolers and the new tunes were developed, the temps are now in oil operating temps of 235..... To be honest here.... oil cooler is important, but if you are still running the OEM tune.... it'll still run hotter than it should.
within the community, there have been arguments on which design is the better.
I run superxparts cooler. I got way too many questions on what it was, when it was naked. So I built a bikini shroud for it. No one asks anymore. I think I'm the only one with the shroud, most X owners don't mind....
Jackie Hale is now the owner of a blue X that she purchased from an Owner that built a crash bar, that is actually the Oil cooler. I do not know how affective it is, but it sounds very unique. And possibly affective. Before that owner sold that X to Jackie, we got the ostrich hide corbin seat off of it, at a great price.
the OEM was designed to be placed hi on the down bars of the frame. It cooled but nothing near what we needed. Its black and I believe it a B and M automotive tranny by design... no matter....
You need to understand that some of my information about history, maybe vague. Things were happening east of the mississippi that us here on the flat lands never heard/knew about. Also things happened up in Minnesota.... Lots of developement type things, ideas, etc. that I have sometimes only heard bits and pieces.
there are also general differences of opinion on some issues. For example, ethanol fuel. Some parts of the country, that is all that is available. We have had major issues with ethanol eating out the OEM liners.... But there are owners that use nothing but ethanol, with no problems. The stand of the conversations are real on both sides. I personally won't use it, unless I know I'm going to burn it up. I won't park it any amount of time with ethanol in the tank.
When it came down to actual history of the 99-00 X.... the late Sir William was the guy to ask. He knew everything about everything dealing with X's
sorry long winded tonight...
Bruce