"Smiley"

iTrader: (171)

I like the feel of more holes/smaller holes when there is more grip. If it was bumpy but still high grip, i would still prefer a 3 hole over a 2 hole on the B6. But again, thats just my personal preference. The 3 hole just seems to make the car more stable in my opinion.

Cain

iTrader: (294)

Cool that is what I am looking for as right now it feels like I am over sprung. Basically getting kicked around a bit more than I think i should.

BK24

iTrader: (10)

This is a newbie question, but why or in what situations would one choose a tapered piston over a flat piston? What are the characteristics/advantages of one over the other?

STLNLST

iTrader: (32)

2hole 1.6 V2 working pretty good in the D216. Thanks again for a great product. Figuring out the car in 17.5 spec class all alone has been challenging with all the heavy hitters locally. One more day of qualifying tomorrow so there's time to improve.

icecyc1

That is a good question and one that led me to build a shock dyno to help me answer. Hearing a lot of different things about different types of pistons, and not finding any actual engineering data to back up those claims was enough for me to try and find the answers.

Short answer to your question: There is no difference or advantages between a flat or tapered piston. I have never seen in any of my data, not low speed, not high speed, not pack, not reversing them, not anything that suggests there is anything special about a tapered piston.

You can achieve the same results between them though choosing oil viscosity. The only difference is that given the same hole # and diameter (i.e. 5H 1.3mm) piston with the same viscosity oil, a tapered piston will move with less resistance. This is due to the thinner piston. You can achieve this same effect with lower viscosity oil with a standard flat piston.

Much talk is spread about how a tapered piston will slip through the oil faster in one direction than another (faster rebound if taper side is down), but this is again nonsense. I've flipped pistons several times, and never once seen a difference in rebound vs compression values. I think most people's opinions are based either on placebo effect, or that they are getting less overall damping due to the thinner piston, but attributing it to a "faster rebound".

Take a look at my shock dyno results. The link is in my signature.

"Smiley"

iTrader: (171)

Typically a tapered piston works better on tracks that are not smooth. If you have a bumpy track, sometimes tapered pistons work a bit better due to having less pack. By having less pack, this allows them to go through the bumpy sections a bit better.

joncmack

iTrader: (31)

"Smiley", have you all experimented with running the V2 pistons flipped to allow faster compression rather than rebound on bumpy tracks? (just like you mentioned above with tapered pistons)

"Smiley"

iTrader: (171)

We personally have not, but have heard from a few people that they do work. We just have never had the need to flip them.

"Smiley"

iTrader: (171)

We are offering a FREE Lightweight B6 (Laydown) Motor Plate with any order of $30 or more (Has to include B6 Pistons/Parts)!

Cain

iTrader: (294)

do you have the part # on the plate in question?

Also, does this have to be a direct purchase from you or can I order from amain and then provide the info with the total?

"Smiley"

iTrader: (171)

It has to be from our site, visionracingproducts.com

You dont have to add it to your order or anything, we just add it to your order!

Cain

iTrader: (294)

cool how long does the deal last and what is the model number of it?

"Smiley"

iTrader: (171)

Part Number is: 1227

At least a week or two. No real ending date yet. Lol

Cain

iTrader: (294)

cool. Looking at stuff for the b6 and the hot bodies d413 Am I correct your piston holes are just straight drilled holes?

"Smiley"

iTrader: (171)

Correct