Does anyone know of a company making metal head gaskets to lower the compression on the Z . please let me know.

 

Nope. But most places can custom make them if you have a gasket for them to look at and some technical specs on the motor.

 

Ohh, you mean a cheater gasket... Try takakaira.com or it might be takakaira.co.jp

 

Why are you strongly against using a gasket to accomplish a lower compression? I know a handful of people who have used gaskets to lower their compression and had great success. Ok, besides the point of it being cheap, so what.... I’d just like to hear your 2 cents.

 

he didnt say cheap he said cheat

 

I never said it was cheap, it's just the cheater method . It works, but when you tare the heads off this beast minus well just replace the pistons and rods while your there

 

If i could remove the head and just pop out the pistons i would but it take rebalancing the system( bottom end) but I have had much success with the HKS headgaskets when turbocharging acuras.

 

the ones we had done are all ready for production now - I'll try to find out the compression offerings we will have this coming week for you guys

 

Awesome, what kind of pricing are you guys offering with your head gaskets?

 

Just so you know, it's "might as well" and not "minus well". I bet you've spent countless hours of your life trying to figure out why a "minus well" would mean what you think it meant. =)

 

I would not go this route just to lower compression to raise boost. Not a good idea!!

 

How thick of a head gasket do you need to lower compression from 10.3 to 9.3?

 

Elaborate, please. Any specific reasons, data, calculations, or is this a gut feel?

Thanks,
D'oh!

 

i was under the impression that a headgasket could only lower your compression by a few .1 so it would make me feel more comfortable at low boost but i would not rely on that to crank up the boost safely.

 

If you could get the engine info... Bore, stroke, combustion chamber volume, deck height, valve relief volume we could figure that out. I've never seen any specs on that kind of info though.

 

Haha, I have no clue where I could find that info either. Maybe I should bug Jeff or Jason@Performance.

 

Generally the reason why lowering compression on a modern street engine via a "thicker head gasket" is not recommended is that it negatively alters the "squish volume ". Increasing the squish volume can reduce the Combustion chambers tolerance to detonation (even if the CR is lowered slightly). Lowering CR via properly designed dished pistons is the recommended method.
If you want to know what "squish volume " means look in the thread about forged internal and lower CR or consult one of the Corky Bell boost books.

 

also lowering the compression on our cars does not fix the weakest link in the block (i.e. the rods). So wether you run the boost to 450rwhp or lower the compression for more boost. I would still not go much past 450rwhp. You will get the same result. 450rwhp is about as far as you want to go on stock internals, so why spend the extra money. when as people can see were already 450 with the 10.3 compression. My plan is to run new rods and pistons but only lower the compression to 9.5 and run 12 to 15 psi boost. much better and safer. just my .02

 

gut feel mainly and the two reasons posted above

 

Thanks guys,

Saw the info on squich volume just moments ago. Cool stuff.

-D'oh!