Does anyone have an idea how far you can safely bore the block with a 12.5:1 N/A setup? Anyone think 87-90mm is possible...i have never had time to open up my project engine yet so i cant make an estimate to get some pistons made...

 

What are you talking about!!!!!!

I think you cannot bore your block any more than 83mm safely, maybe you can go to 83,5mm but I don't think you can even get there.

 

Im talking about the distance in between the cylinders...with the use of a sleeve..a small one, but i know you can have the sleeves almost right against one another (N/A only) so the cylinder walls are about 1mm apart..does anyone know how much room there is between the cylinder walls?

 

ok you know resleaving a block takes ALOT of work and can easily fail?
i wouldnt go higher that 83

 

why would you need to sleeve a beta?

 

1. The fact that some of you are talking about sleeving a solid deck block means that you probably shouldn't be talking about any of this. wtf1.gif
We don't own Honda's. Thank God.

2. Increasing the bore is the worst way to make power. Try a longer stroke. 1.8L crank and rods ring any bells?

 

Webtech says the last repair size of the BETA1 is 83mm.
The smaller walls between cylinders the more strain to the engine, weaker walls. Don't forget there are oil and coolant pipes (?) between cylinders.

It's impossible to go up to 90mm, cause you will have mono-eleptical-cylinder engine wink1.gif

 

only 1mm is the safe any more then that is a issue of reliabilty

for drag only 2,mm is ok street is 1mm

 

the 1.8 has a shorter stroke...
fact is... short stroke large pistons engines tends to make much more power in the higher rpm range then an engine of the same size with a longuer stroke smaller pistons

our 2.0 engine already have quite a long stroke, i wouldn,t stroke it more then it is exept for very specific applications

 

Yea, that did sound backwards. I meant "destroking" the 2.0 by using the 1.8L crank (85mm). You should easily get 8500rpms with it.

^^^edit
You would need custom rods as they need to be a little longer.