Can someone tell me the reason I shouldnt boost an NA ?

yeah even with a metal gasket you can still run into problems with combustion dynamics and a poor flame front

 

would a 2mm be safe?

If changing the pistons was the chosen option how much of the engine needs to be removed to get the pistons off.

 

All of it. The piston/rod assemblies are inserted and removed from the top of the block, with the rods unbolted from the crank.

 

yeah thats right, and at that stage yo may aswell put in TT pistons and oil squirters and that anyway

 

now see here

10.4:1 engine with a 9PSI supercharger kit from CAPA. http://www.capa.com.au/kits_holden_ve_v8.htm
So why not on a Nissan engine. I would safely bet the Nissan engines are built better than those American tonks.

 

the compression is not the problem. i have seen escort cosworths in the uk running 11.5 compression and 2 bar of boost. detonation is the problem associated with high compression that all depends on piston and combustion chamber design.

Some Jaguar V12's ran 12.5 to 1 compression and could still take 22 deg of static advance.

 

can you elaborate?

I thought detonation was a result of the compression being higher than the fuel can take and the mere compression is enough to self com bust the fuel(detonation). Can you differentiate between high compression issues with boost and detonation with boost?

Also if detonation is the problem what is the solution?

 

No I just went and spent 25K extra and about 1000 hours rebuilding a car .

Wish i had of, as I would be much richer :bash:

 

The solution is:

Higher octane fuel
Water/methanol injection
Colder plugs

Anything that removes heat from the combustion.

 

Try to get insurance with water injection on your car. You are correct however. Water injection fixes the main issues.

 

Just paint it black and write Nissan on it and say it was a factory option

 

detonation is the occurs when the combustion mixtures explodes or burns quickly rather than forming a nice slow flame. sometimes mulitple flame fronts form and collide with eachother this will also cause the flame to terminate before the piston reaches the end of its stroke. so combustion chamber design, piston design and spark plug location all effect the flame formation in its early stages.

detonation can be offset by reducing combustion temperature and/or combustion pressure. Higher octane fuel burns slower than lower octane fuel. water/meth injection reduces charge temperatures .