I think it is probably related to this...
But don't do anything till someone who has done it posts a reply.
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| Hif44 dampers whats the difference https://www.ausmini.com/forums/viewtopic.php?f=2&t=71033 |
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| Author: | kiwiinwgtn [ Wed Jun 01, 2011 8:56 pm ] |
| Post subject: | Hif44 dampers whats the difference |
I have been wondering what the difference is between a LZX2085 and LZX1505 carb damper The LZX2085 is the one to use for modified Mini's so they say Trying to figure out why Ta Kiwiinwgtn |
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| Author: | Morris 1100 [ Wed Jun 01, 2011 9:01 pm ] |
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The difference is the speed of the piston drop down. The LZX2085 fixes the flat spot on the upchange. |
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| Author: | kiwiinwgtn [ Wed Jun 01, 2011 9:09 pm ] |
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What did they change on the LZX2085 |
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| Author: | Morris 1100 [ Wed Jun 01, 2011 9:20 pm ] |
| Post subject: | |
I think it is probably related to this...
But don't do anything till someone who has done it posts a reply. |
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| Author: | kiwiinwgtn [ Thu Jun 02, 2011 6:52 pm ] |
| Post subject: | |
Thanks Morris 1100 Thats what I am after Hopefully some one has both dampers and we can do a measure up I cannot find anyone with a LZX2085 damper close to home Interesting BMC kept it secret If am brave enough to go outside (its zero degrees) I will measure mine Ta Kiwiinwgtn |
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| Author: | Morris 1100 [ Thu Jun 02, 2011 6:53 pm ] |
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Is is not a secret, we know about it. 
I have heard of people modify them by trail and error, just shortening them a little at a time till they run right. I have also heard of people making them longer by adding a washer. |
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| Author: | kiwiinwgtn [ Tue Jun 28, 2011 8:57 pm ] |
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There must be a LZx2085 damper out there
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| Author: | rathcoole [ Wed Jun 29, 2011 10:54 am ] |
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I have both, I will try to remember to do a measure on the weekend... cheers Kevin |
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| Author: | kiwiinwgtn [ Wed Jun 29, 2011 5:42 pm ] |
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Thanks Kevin That would be great Ta Kiwiinwgtn |
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| Author: | lmbm [ Mon Jul 04, 2011 7:17 am ] |
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Hi, i was comparing both LZX1505 and LZX2085 dampers, actually both have same piston length ( 3/8" ) but the LZX2085 has two grooves in the lower part of the piston, each has about 0.020" large x 0.020"deep allowing somehow more oil to flow in the bore. not sure how easy to cut these grooves, probably shortening the piston as suggested before will achieve the same. Cheers Luis |
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| Author: | 1310/71 [ Mon Jul 04, 2011 7:50 am ] |
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Interesting then that they knew about it in 1959, but didn't do anything about it for the HIF44 until well into it's life presumably? |
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| Author: | kiwiinwgtn [ Mon Jul 04, 2011 4:27 pm ] |
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Interesting Any chance of a picture of them side by side Cheers Kiwiinwgtn |
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| Author: | rathcoole [ Mon Jul 04, 2011 7:57 pm ] |
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Just taken some pics and some measurements, gimme a sec and I'll post it all up. Essentially, they are identical apart from 1 bit... BRB Kevin |
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| Author: | rathcoole [ Mon Jul 04, 2011 9:53 pm ] |
| Post subject: | |
OK, The difference is in the bevel diameter and height (or thickness, see the first image for reference as to which bits I'm talking about), and the 2 grooves machined into the outer circumference of the piston. Everything else is as near as identical as measured with a pair or verynears.  By making the diameter of the bevel at the top of the shaft smaller, more oil can move from above to below the damper piston as the suction chamber piston falls but as the suction chamber piston tries to rise, the piston seals against the bevel and works the same as a std damper. The grooves in the damper piston appear to hold oil so it moves with the suction chamber over the short distance it can move more effectively than the standard damper would be my guess? The bevel itself is also thicker with a more pronounced radius.
LZX2085 Fast Drop Damper Shaft Bevel Height (thickness measured from the flat to the base of the bevel) 3.52mm Shaft Bevel Top Diameter 7.9mm Shaft Inner Diameter 3.97mm Piston Outer Diameter 8.58mm Piston Inner Diameter 5.34mm Piston Length 9.6mm LZX1505 Standard Damper Shaft Bevel Height (thickness measured from the flat to the base of the bevel) 3.38mm Shaft Bevel Top Diameter 8.5mm Shaft Inner Diameter 3.97mm Piston Outer Diameter 8.54mm Piston Inner Diameter 5.33mm Piston Length 9.6mm Length from bottom of shaft top bevel to E clip is the same on both. I didn't write the figure down. For reference, so we all know what bits I am referring to - 
LZX2085 fast drop on the left, LZX1505 Std on the right in all the photos - 
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| Author: | rathcoole [ Mon Jul 04, 2011 10:51 pm ] |
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Oh and just for reference, the 2085 did make a big difference to the flat spot I had with the std damper. cheers Kevin |
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