baloga41

i have the ls6 64 cc pp heads it is 10.5 how much should i mill to reach 11.2 or 11.0??



thanx in advance

baloga41

and what would be the differnce in hp and tq ?is it worth it ?

baloga41

making 441 rwhp and 410 tq now w/o milling what do y'll think i'll get after milling?

JakeFusion

iTrader: (7)

Generally .006-.008 shaved will give you 1cc off the combustion chamber (depending on the shape, size, etc.), so if you want 11:1, I need to know your current gasket and whether this is a stock 346, or stroker.

Assuming you are using the stock GM gasket .054, and piston out of the hole .008" on a stock shortblock, I get 10.71:1 CR as it stands (10.5 would take .005" out of the hole and .060" gasket). To get to 11.2:1 would take a 60cc chamber, or .024" shave. That'd give you 11.27:1 with the first set of conditions, or right at 11.0:1 if you are using the second.

So, mill it .024" and you'll be in your range. It will bump compression a good half a point.

JakeFusion

iTrader: (7)

G5X3? More compression will help with drivability and throttle response for one thing. A half point of compression will increase torque everywhere by as much as 5%. Meaning, you'll probably pick up 10-12rwhp while improving drivability.

MKS

Make sure you check PVC with a G5X3

PREDATOR-Z

I think you mean PTVC (piston to valve clearance)

baloga41

yeah i allready did the notiching will post some pictures soon

Phil'sC5vette

iTrader: (4)

http://www.rbracing-rsr.com/compstaticcalc.html

baloga41

so gains of increasing the comp. by 0.5 will be around 10-12 hp and 20-30 tq???
does anybody have dyno of b4 and after milling only?

PREDATOR-Z

On Average It Will Be 2% From Base Before Increase.

silverTA2002

iTrader: (1)

I doubt you'd gain that much from just milling, but if the added compression doesn't cost any extra $$ and won't hurt anything, why not?

Personally, I didn't mill, but went with a thinner gasket, a .040 cometic. Higher compression without milling and better quench.

lilbuddy1587

iTrader: (1)

I think he will gain quite a bit seeing as how the overlap in the x3 bleeds off some compression.

baloga41

should i do it?

FiveSevenEagle

detonation will kill u , especially when u are in the middle east and u want to spray 150 shot !!
am i right guys ??

1FSTBRD

iTrader: (1)

let me know how this pans out i was wondering about bumping my compresion when I do my heads and cam over the winter my big question is if I am going to mill them should go to 10.8 or 11.0 let me know thaqnks jay, 98 t/a a4 bolt ons and free mods

PREDATOR-Z

Hi five seven,
I spray up to 200 dry in Dubai. It is all in the tuning and we have 98 Octane gas. also I run 11:1 Compression with TR6 NGK gapped .035

baloga41

did you hear that Dr. 57eagle ? it is all about tuning

FiveSevenEagle

hi predator ,
useful comments , so the others ,
BALOGA , he said 98 octane 98 OCTANE did it ring in ur head .. not 93 octane .. ok ok dont tell me that we will add torqo .. wagd ganna use the car everyday !

it is not that dangrous to go with this compression + or - juice , am saying what would be the difference .. 10 , 15 lbz of torque why not to be in the safe side and add some juice .. 250 for instance .. since he already has the F2 and the 255 pump ?

anyways either he is going to mill it or not i dont disagree with u ,
u r right

MKS

Yup