Compresion - pistons!?

[fuel]

If going over 1bar I would be inclined to use the MLS gasket. Just eliminates one more weakness.

My car is basically factory standard, motor refreshed approx 10,000miles ago with factory 7.8:1 pistons, new rings, bearings and MLS head gasket. I run approx 15psi of boost through the factory turbo now running a 20G comp wheel/housing and 7deg cut exhaust wheel. If I were the build the engine again, I would have gone with later model Evo pistons with a higher compression ratio to improve off-boost (and on-boost) performance.

 

how many mm MLS head gasket you use-1.29mm , or bigger?
what do you mean whit /to improve off-boost (and on-boost) performance/.?....

 

[GSX_TC]

What he means by off boost is when the boost gauge is at zero when you drive around, using your motors compression to get around. On boost meaning anything above zero on the boost gauge, higher compression would naturally decrease spool up time

 

Another qestion...
Will there be a problem if I put turbo pistons from 2 generation Eclipse 1997 year with a 7 bolt engine in to my 6 bolt 4g63 engine??....

 

[GSX_TC]

No that would not be a problem, in fact they would be better than the stock VR4 pistons because of their higher 8-5-1 compression. I'm running 2g pistons in my motor right now and it's nice.

 

/GSX_TC/-what head gasket you use in combination with 8.5.1 pistons? ...how meny milimeters?
That kind of pistons you use click

 

[GSX_TC]

I use the factory composite OEM head gasket with my 1grods/2g piston 6bolt setup. 15 pounds on an EVOIII 16G

 

[fuel]

if using 7-bolt pistons (ie from 2G or Evo) then you'll need to machine the small ends on the rods to accept the larger 22mm wrist pin. Otherwise buy some aftermarket forged rods which suit the 6-bolt crank and the 7-bolt pistons. Do NOT use 7 bolt rods on a 6-bolt crank.

Also I don't know why you keep asking about the thickness of head gaskets - ideally you DON'T want to change the thickness of the head gasket over stock size. Just stick with either OEM composite or a MLS of the same thickness. You want to control the compression ratio with the pistons rather than the head gasket.

 

I ask these questions because I'm not very familiar with the technical stuff .It is nice to learn from experienced people like you guys... thank you for this...
Now I understand that if I put 8.5 pistons/2G/is appropriate not change the thickness of the head gasket,and i can stay with the factory thickness...
And i DO NoT have to use 7 bolt rods on a 6 bolt crank .I will use my 6 bolts rods whit the pistons from /2G/ ...

 

[GSX_TC]

Never re-use any head gasket either

 

Yes...i will take new head gasket....but I do not know what head gasket....
The question is if i use 8.5.1 compression pistons...what exsacly head gasket should I use?? ...How thick must be? ...

 

[GSX_TC]

just use an OEM composite headgasket man, here's a few links to ones for a good price click and here click