View Full Version : Shock pistons????
What is the difference in "feel" of a drilled piston compared to a factory piston?
Will it pack more because of the sharper edges around the hole??
i am after personal experinces here, not what you think it might do, ash:p
Southwell
04-03-2008, 01:42 PM
Well if you drill out two holes to the 'standard' holes and leave one smaller you will get more pack than a std piston. I quite like my drilled ones, the car feels quicker overall, but slightly less stable over bumps imo. Im going to try some standard ones to do a back to back test as i have been running them since southport nat.
Yeah i understand that if you leave one hole smaller it will give more pack, but i have heard people say that a drilled piston feels different to a std piston with the equivelant holes:confused:
RogerM
04-03-2008, 02:34 PM
If they are talking about a square edged entry like the AE pistons they are talking out of their behinds ....... on this planet we call Earth the laws of fluid dynamics are clearly defined ..... :D
If your talking about comparing a bell mouthed entry to that of a square edged entry then there will be a difference, and what is more that difference will change as piston speeds change. The square edge piston will feel like it's gaining "pack" at lower piston speeds, this is to do with the transission between turbulent and laminar flow as the fluid goes through the holes.
Chrislong
04-03-2008, 02:52 PM
I have wonderred this too.
Roger I think you are talking about the edge of the piston, i.e. the Losi is rounded edge vs the AE is square edge, and its an interesting & relevant arguement. But what Lee asked about is regarding the profile of the hole.
I have heard a drilled piston feels nicer than its equivalent moulded piston... the question is... why?
Northy
04-03-2008, 02:53 PM
The holes on a moulded piston are tapered (have some draft angle on them) to make it possible to remove from the mould.
G
_sleigh_
04-03-2008, 03:10 PM
The holes on a moulded piston are tapered (have some draft angle on them) to make it possible to remove from the mould.
G
With that in mind, you should fit pistons the same way both sides to get the same feel/effect.. That's nice and easy on say a HB or AE piston, but not so on a Losi that doesn't have any markings.
Chrislong
04-03-2008, 03:16 PM
With that in mind, you should fit pistons the same way both sides to get the same feel/effect.. That's nice and easy on say a HB or AE piston, but not so on a Losi that doesn't have any markings.
The Losi pistons have a circle where the ejector pin has pushed it outa the mould - I have always put them in with this facing down and never really been sure if it mattered - just me being obsessive about detail, but other than this there is no markings.
Southwell
04-03-2008, 03:21 PM
Yeah i understand that if you leave one hole smaller it will give more pack, but i have heard people say that a drilled piston feels different to a std piston with the equivelant holes:confused:
Drilled ones should be more accurate size than std ones, if you drill them straight....
Danny McGee
04-03-2008, 03:29 PM
The Losi pistons have a circle where the ejector pin has pushed it outa the mould - I have always put them in with this facing down and never really been sure if it mattered - just me being obsessive about detail, but other than this there is no markings.
I do the same Chris. injection point down. plus it looks better :eh?:
You really dont want to start thinking about laminar and turb flows anyway, not much fun. You could then start to look at the heat losses etc and that is ZZZZZZZZZZZZZzzzzzzzzzzzzzzzzzzzzzzz.........
Wraggy
04-03-2008, 03:37 PM
. plus it looks better :eh?:
.
Danny you got Clear shock caps then ??? :p
RogerM
04-03-2008, 03:47 PM
The piston holes don't need to be drafted as the material shrinkage would open the holes out. Certainly don't darft IDs on our mouldings at work.
Wraggy
04-03-2008, 03:49 PM
If they are talking about a square edged entry like the AE pistons they are talking out of their behinds ....... on this planet we call Earth the laws of fluid dynamics are clearly defined ..... :D
If your talking about comparing a bell mouthed entry to that of a square edged entry then there will be a difference, and what is more that difference will change as piston speeds change. The square edge piston will feel like it's gaining "pack" at lower piston speeds, this is to do with the transission between turbulent and laminar flow as the fluid goes through the holes.
de ja vu !!!!! :confused:
RLGfx
04-03-2008, 03:50 PM
i run white pistons..... :p
Wraggy
04-03-2008, 03:54 PM
. double post
lol Roger they were an hour apart from each other !!!!
and said word for word ...
what book was that out of ??? :woot:
Danny McGee
04-03-2008, 04:09 PM
Danny you got Clear shock caps then ??? :p
No, but in my head i know it looks better and a Happy Danny = A Friendly Danny :)
RogerM
04-03-2008, 04:15 PM
lol Roger they were an hour apart from each other !!!!
and said word for word ...
what book was that out of ??? :woot:
The book of the "hung Win 2K PC"
Chris Doughty
04-03-2008, 04:17 PM
The book of the "hung Win 2K PC"
is that an engrish book?
is that an engrish book?
It sounds like some sort of chinese gay porn:o
RogerM
04-03-2008, 04:53 PM
It sounds like some sort of chinese gay porn:o
LOL .... does a little.
I meant I am running a Windows 2000 OS and Internet Explorer 6.x combination that sometimes, only really on this site, hangs a page and won't be shut down without resorting to the task manager.
It's only normally a problem with PMs, which always hang the machine and force me to end all IE sessions and restart after sending a PM.
In this case it hung, I copied the post out to notepad and then restarted my oople session and posted ..... obviously the hung pack didn't end properly and finally made it to posting!!!
markwilliamson2001
04-03-2008, 07:38 PM
Why don't you just upgrade to IE7?
RogerM
04-03-2008, 09:15 PM
Why don't you just upgrade to IE7?
I tried that but it's hugely unstable on the win 2k platform.
Before anybody suggests upgrading the OS the only XP disc I have is a cut down version supplied with my laptop ..... seriously unstable if used with any other board.
With Vista not being compatable with any software I use I'm stuck till I can afford to do a full system upgrade .... which at this rate will be about 2028 .....
markwilliamson2001
04-03-2008, 09:22 PM
Aye, I wouldn't touch vista with a bargepole yet....
Its just fatter and heavier than XP, with no real improvements in technology, just a glossier front end that requires better hardware.
Just a thought, but have you tried alternatives such as Firefox, Opera etc etc. Firefox 2 is extremely stable, and has tabbed browsing! Rock on!
Mark
Southwell
04-03-2008, 09:23 PM
http://www.mozilla.com/en-US/ is your friend....IE7 memory leaks like a mofo anyway so an old machine will die with it on....
burgie
04-03-2008, 09:25 PM
linux.....
RogerM
04-03-2008, 09:32 PM
Thanks for the ideas guys .... it's only PMs on oople that kills it so I'll live ..... it's not like I have any friends who will want to PM me any way
:cry:
RogerM
04-03-2008, 09:36 PM
How OT are we now ... LOL
Ok, so i am struggling to source some imperial drills to drill out some pistons, but the #54 drill that i am after is equivelant to 1.40mm the equivelant to a black hole is 1.09mm, but the nearest drill i can get is 1,10mm, am i really going to notice 0.01mm??? afterall im going to be using a dremel anyway:)
Richard Lowe
10-03-2008, 12:12 AM
I tried that but it's hugely unstable on the win 2k platform.
IE7 Won't install on Windows 2000, only XP or later.
Before anybody suggests upgrading the OS the only XP disc I have is a cut down version supplied with my laptop ..... seriously unstable if used with any other board.
No such thing as a 'cut down version' of XP, a OEM versions are the same it's just the product key that dictates what hardware you can activate it on. (EG, a VLK licensed to brand x will only activate online on the origonal hardware, otherwise you have to use the phone method).
But I digress, back to shock pistons... :p
Ok, so i am struggling to source some imperial drills to drill out some pistons,
afterall im going to be using a dremel anyway:)
No! Do it by hand!
Alfonzo
10-03-2008, 09:09 AM
Ok, so i am struggling to source some imperial drills to drill out some pistons, but the #54 drill that i am after is equivelant to 1.40mm the equivelant to a black hole is 1.09mm, but the nearest drill i can get is 1,10mm, am i really going to notice 0.01mm??? afterall im going to be using a dremel anyway:)
No! :)
No! Do it by hand!
Cheers elvo, i didnt know how easy it would be:)
I didnt think i would feel it but you never know:D
Chris Doughty
10-03-2008, 09:43 AM
I would definately buy the correct imperial drill bits, they are called #56 #57 and so on.
don't buy the metric equiv if you plan to 'copy' peoples setups and referance other companies pistons like Losi.
Northy
10-03-2008, 09:47 AM
Lee, I'll get you some today :thumbsup:
Another thing i am thinking about, just thought i would add it onto this thread.
I am having some blank pistons made up for the aero, if i go for a slightly thicker piston will it provide more pack for the same hole size:confused:
It might not but my head thinks it might:lol:
vBulletin® v3.8.7, Copyright ©2000-2025, vBulletin Solutions, Inc.