stock head gasket thickness?

16bit · Postby **16bit** » Fri Apr 04, 2008 9:43 am

just wondering what the stock head gasket thickness is? and if I was to change it to a 0.8mm one would the compression ratio go to in a nb8a 9.5comp motor?

AJ · Postby AJ » Fri Apr 04, 2008 4:55 pm

won't make a bees fart in a cyclone difference to your compression ratio.

mazlot · Postby **mazlot** » Fri Apr 04, 2008 4:58 pm

won't make a bees fart in a cyclone difference to your compression ratio.

Depends how many are in there now :mrgreen:

AJ · Postby AJ » Fri Apr 04, 2008 5:04 pm

mazlot wrote:
won't make a bees fart in a cyclone difference to your compression ratio.

Depends how many are in there now

true.......we once tried decompressing a holden 6 we'd turboed by using 3 repco gaskets.........that ended in spectacular fashion..........LOL :lol:

Steampunk · Postby **Steampunk** » Fri Apr 04, 2008 5:05 pm

how large is the bee and how small is the cyclone?
[sorry, I'm bored again]

AJ · Postby AJ » Fri Apr 04, 2008 5:07 pm

1red5 wrote:how large is the bee and how small is the cyclone?
[sorry, I'm bored again]

you go & check your tax bill again

irwin83r · Postby **irwin83r** » Tue Apr 08, 2008 7:44 am

the mazda factory gasket i was given (got from mazda spares) looks like its about 1mm thick. so your only going .02 of a mm which is .00078\" i hear a 0.020\" head shave makes a .5 comp increase so yeah.. not going to be huge gains. ill get a Micrometer from work and measure the standard one properly tonight if i remember.

cheers

16bit · Postby **16bit** » Tue Apr 08, 2008 9:40 am

thanks mate - was only wanting to bring it up to 10:1 anyway.

Sean · Postby **Sean** » Thu Apr 10, 2008 11:54 pm

It's popular to lower comp through using decompression plates and or thick gaslets, but I've never heard of trying a thin gasket to increase comp.

I'd be a bit owrried about the quality of seal in a gasket thin enough to make a difference.

16bit · Postby **16bit** » Fri Apr 11, 2008 9:55 am

its toda part so i'm not worried about quality. doing it to get a bit more power from a supercharged application. I have not decided to do it yet but just checking out the details.

Benny · Postby **Benny** » Fri Apr 11, 2008 4:35 pm

Why not turf the gasket all together and get the head and block O ringed?
You can then run high boost and not worry about blowing head gaskets.

In my nefarious youth, I had a turbocharged Commodore that kept blowing head gaskets because I wanted to run high boost (21 lbs), and not so low compression.
Got the head and block O ringed, and never had a problem with it ever again.

Mind you, my transmission expert and me were unable to make any Turbo-Hydramatic 400 box last more than a few months, but that's another story.