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Air Cylinder bottoming/topping out ?s

1.4K views 15 replies 7 participants last post by  416impala  
#1 ·
Ok I just got 4 Parker air cylinders installed and the ride is truly great and a lot better than what I thought...its ran with 1/2 inch line to the cylinders with 1/4 lines to the valves from the Ts...my problem is that the front cylinders like to bottom or top out if i dont ride with at least 140 psi in them....the guy who installed them said that there is more play in these cylinders to allw for a softer ride as opposed to a stiff ride which would have less play in the cylinder....apparently with not enough air in the cylinder the shaft inside the cylinder is topping out on the interior of the can

So my question is is this right and should they be doing this at like say 120 psi which they tend to do and also corners cause the knocking sound or bottoming sound too...will this do damage to the cylinders or is it something that you just have to deal with having cylinders becuz i would like to be able to drive at a lowered height still even on air and not have to drive up and then just lowere it when i park..any help would be appreciated if anyone has had these problems ...from what Ive read these PArker cylinders and supposed to be good cylinders and they do ride great so Im suprised they would be bottoming out

thanks
 
#3 ·
it may not be the cylinders ..the cylinders are adjustable in lower fork as to how high or low you want to set them and we checked em earlier and looked at the top of the cv axle and it didnt look like the bottom of the cylinder shaft was hitting but maybe thats whait is ..I dotn know..I dont get why they would would let you mount them like that if they were gonna hit the cv axle...but like i said we did look at that and it didnt look like it was hitting but maybe someone has experienced this before any ideas
 
#5 ·
thats normal you cant drive it too low or too high if not ill bottom out or top out , sucks it gets rough if you ride with no air. you get used to have it set perfect after a while
 
#7 ·
you should be able to ride in the middle right?
maybe theres a problem with the "t"'s letting too much air back to the tank when you hit a bump? I bet if you put the valves directly over the cylinder it would help. You'd have to buy 4 more valves though. It would also ride a bit rougher. Just a quess.
 
#8 ·
thanks for the input guys...i guess im just used to regualr bags and this isnt as uncommon as i thought..this is the first time ive had cylinders so i thought that they would be like bags and I could ride low or high but yeah if i find the right height they dont knock that much but if not it they knock quite a bit ...another question is if i were to add accumulators to the setup would it make the ride stiffer and would the cylinders bottom out less becuz right now the ride is actually pretty good except for the bottoming

thanks
 
#9 ·
Originally posted by tripdadj@Mar 14 2006, 12:31 PM~5046321
thanks for the input guys...i guess im just used to regualr bags and this isnt as uncommon as i thought..this is the first time ive had cylinders so i thought that they would be like bags and I could ride low or high but yeah if i find the right height they dont knock that much but if not it they knock quite a bit ...another question is if i were to add accumulators to the setup would it make the ride stiffer and would the cylinders bottom out less becuz right now the ride is actually pretty good except for the bottoming

thanks
nope, they would soften the ride.
 
#11 ·
Originally posted by tripdadj@Mar 14 2006, 12:48 PM~5046430
so if accumulators soften the ride even more would it get too floaty but mostly would it help with the bottoming out thats my number one concern over ride quality

thanks
probably. The way that accumulators work is that they try to soften the air being pushed back from the impact.
 
#13 ·
Originally posted by demasiado@Mar 14 2006, 05:55 PM~5048568
wouldn't that give them more travel and bottom out more?
I'mma do a diagram for you. I'm bored plus it might help explain it better for you and me. :biggrin:

Dammit!! I just confused myself again. :angry:
 
#14 ·
"Stolen from another forum"

If you are worried about ride more than quickness I also recommend getting two 1/4 gallon tanks and putting them between the rear cylinders and the fill valve as accumulators. It will keep the back from flying up every time you hit a bump. (I also use 1/4 inch line between the accumulators and the cylinders — it almost works as a shock -- The back of the car actually rides smoother than stock, even super low)
 
#15 ·
mine used to botom out in bumps just go to home depot get a plug for the bottom of the whole of the cylinders and head over to autozone buy the smalles bit you can find, drill a little whole trough the plug and it should be fixed trust me