jkirkwood

iTrader: (8)

A drilled 55 piston vs a molded 55 piston.

The drilled piston will have more pack as the holes in the pistons are sharper at their edges which promotes turbulent flow of the fluid than the molded pistons would. The molded pistons have rounded edges which promotes laminar flow of the fluid.

In fluid dynamics turbulent flow occurs at high Reynolds numbers (greater than 3000) and lamiar flow occurs when Reynolds numbers are below low (less than 2100). The sharper edges of the piston hole edges simply help promote the high Reynolds numbers.

SlobbaTech

Everyone runs drilled 54 pistons in the front of the 8ight and 8ight-T cars. If they run 55's in the rear in buggy they run drilled pistons, if they run 56's in the rear of buggy it's a stock/molded piston, if they run 55's in the back of truggy I'm not sure if they run stock or molded pistons. A drilled piston will have slightly smaller holes (more pack/stiffer) than a stock/molded piston. To make a drilled 54 piston you need to take a piston with smaller holes (55 or 56) and use a #54 drill bit to drill all 6 holes to a 54 size. To make a drilled 55 piston you need a 56 piston, then drill it's holes out with a #56 bit to get a drilled 55 piston.

R40Victim

iTrader: (1)

What are the direct effects of the Reynolds numbers on the performance of the shock's rebound?

Dale.0

iTrader: (2)

So Slobba Tech, when on the Drake set up it says #54/40, what they are really running is drilled #54/37.5? And in the rear #55/32.5 but they really run drilled #55/30?

Kave

iTrader: (17)

Is there an oil thats preatty much standard also?

SlobbaTech

Dale...yes. Reynolds number...I wouldn't try to get that precise with fluids, fluid stuff is very hard to figure out and you'll probably end up spending tons of time figuring it out just to get a ballpark figure. On the standard oil...no there isn't one viscosity shock oil that works the best in the front and rear of the 8ight/t cars. For the front of both cars you need 37.5-40wt, for the rear you need 25-32.5wt oil.

gtsum

Yep - I run 40 wt front with 54 pistons and 32.5 wt rear with 55 pistons and it works a lot better (for me) then the stock wt and pistons

Hrdluck13

iTrader: (8)

Guys,
I just started driving an 8.
I had a Jammin and a Sp2 and most recently the Mugen truck..
I like the losi allot and am glad I changed..
The only problem I am having is
A. I run a Vspec and for some reason using the stock motor mount and clutch set up the screw that retains the clutch bell is "drilling" a hole into my gas tank.. Anyone having an issue with this?
B. I cant seem to get the rear end tame... I am running the Truhe set-up.. Any suggestions??


Thanks for all the good info on this thread.. It has helped allot..

Brian Miskolczi

iTrader: (162)

Slobbatech- So if i drill out the pistons, will i still be running 40wt front 32.5 wt rear. Or do I change the fluid also to 37.5 front and 30 rear once the pistoms are drilled? LMK thanks.

sport10

Use either Adam Drake's "the Dirt" or Mike Truhe's posted setup. I like "the Dirt" setup but with 30 weight oil instead of 32.5 weight oil. I am also running 3-5-1 diff fluid setup and like it.

losi8ight

iTrader: (1)

Yeah like sport said above 3-5-1 is a great diff setup I am running that also. The only thing is with running 1 diff oil you have to maintain it a little bit more so that means you have to check on it a little bit more frequetley so the oil does not get cooked into the diff case it self.

Dale.0

iTrader: (2)

Slobba, thanks. Any other little tricks we should know about?

Are you coming to the mod nats warm up race?

trebor

iTrader: (6)

Does anyone have any extra drilled pistons they would like to share? My LHS doesnt carry them. Ill even pay.Help. I am trying to get the right set-up so it will be nice.

*Topher*

iTrader: (2)

Where is Adam Drake's "The Dirt" setup posted?

micrors4guy

iTrader: (50)

trebor- you dont NEED the drilled pistions to have a good setup.