106mm pistons.

 

106mm pistons with OEM crankshaft ??? Is it too big for sleeves ??

 

http://www.fvd.de/de/en/Porsche-0/-/...__9.4%3A1.html

 

Yes , but i think it Requires diffrent Length of rods !! Not sure

 

I was meaning the distance between cylinders walls with stock pistons and 4.1.

 

I would have to confirm with Rhonda about the rods. I know you have to machine the water jackets. Also if you are doing all this work its no big deal to change the rods. I guess this a cheaper way of doing it. But the other way would be to change the crank!

 

Thats will be great , thanks for the info sir

 

You are welcome bro anytime. I'm always happy to help you guys on here. Tuning is my passion brother.

 

If 106mm pistons are available why does everyone opt for 102mm pistons. Is there an issue boosting a non stroked 4 liter engine?

 

Guys,

3.6 liter oem dimensions are;
Piston 100mm
liner outside is 106mm, the thickness of the liner are 3mm each side

3.8 liter dimensions are; (3745cc)
piston 102mm
liner outside is 106mm, wall thickness 2mm each side

3.9 liter dimensions are; (3894cc)
piston 104mm liner outside is 106mm, wall thickness 1mm each side

4.1 liter dimensions are; (4045cc)
piston 106mm liner outside is 110mm, wall thickness 2mm each side
You need to modify the water housings and also the crankcase to fit these liners and much more compilications with this setup.
I have even one engine coming even with 107mm.

All these pistons can be installed with oem crank and oem rod dimensions.

All of 3,8 - 3,9 - 4,1 liter piston liners must be steel because of less wall thickness.
This is why most tuners go with 3,8. It has the most wall thickess and easy to fit.

All of these stuff seems easy to write, but there are so many details to calculate and consider if you want to build an efficient engine;

headgasket type, headstuds, compression ratio, piston dome design, rod/stroke ratio, balance, piston-rod weights, piston oiling, piston rings etc...

We are working on several different things to get 4.6 liter out of 6 cyl. boxer engine. I will give more info very soon if we succeed.

Cheers,
Emre

 

That is why your reputation is so high in this forum. Thanks.

So you don't play with crank and rods size to increase engine size. What is the reason? Higher costs?

 

This is very good info Emre and 4.6ltr cannot wait to see.

You deserve a rep point!

 

we also play with crank and rod size
we have 3 different crank and rod size

 

+1 Great info. Thanks for sharing. That's why I stayed 3.8. Once you see everything totally apart, and then start putting in aftermarket/modified stuff, cams, pistons, studs, ring gaps, wrist pins, valve springs/lashes, you start praying that it is somehow all going to work. As Emre says, so many details and one little thing can screw you over. That why it's critical to seek out someone who really knows what they are doing. Nice work Emre. Can't wait to see the 4.6!

 

Great informations , thanks emre !!

So which setup is the best as performance , going with bigger bore (bigger pistons) or playing with crankshaft snd rods size ??? I know the 2nd option is more cost ,