My head gasket only leaked oil under high boost. What if the busted head gasket pressurizes the cooling system and pushes water out the break.

I stick by my earlier comment. Weakened head gasket let loose. Pull the head, and verify for all of us!

Sister car at 500+ wheel HP.

Head lifted, see water splash at end of video.

We are from little NZ, only 3 of us pushing the BP this far in the country.

I have since found the reason for it and rectified it.

We will sort the issue on this one too, but thank you all for the questioning.

No dyno queens here, the red 2WD has run 10.79@136 and is also been used for circuit racing too.

So at idle and low boost the head gasket is fine, not leaking, not pressurizing the cooling system etc

when we feed it high boost the head lifts and its pressurizing the cooling system

I expect when i pull the head I will see the leak between a cylinder and water jacket

Bp05 JRCozy?

Edit, saw the vvt. What was the fix?

This thread car AL4SPN is a BP26
JRCOZY is a BP6D

AL4SPN will soon be a BP4W

Not keen to share the fix due to condescending attitude Chris has received on here, all he was after was shared experiences.

But yes what the above says needs to be done, gaskets long gone from the lift, needs skim/new gasket and the mods I did to mine in the head.

Cylinder pressure from e85 and added timing (at lower boost) has lifted the head, is this not the point of using e85?
Cylinder pressure on pump, 30psi and the set timing made 300KW and no gasket/lift issues.

In our defense. 100+ teenage fucks come in yearly asking very similar questions, without any background, or credibility, and receive the same treatment. It's kinda the mtg.net way.
.that said, I challenge you to find a better forum for a shared knowledge base, especially one this deep and diverse.

More people have joined this forum because of the forthcoming attitude, others willingness to spare no detail, all in the name of fun.

So, again, I inquire. What particular mods have you done to the head to make it last at the elevated power levels?

Don't confuse condescension with incredulity. He came in blaming his problems on an assumed issue that virtually nobody in this community has ever encountered. We responded with the appropriate level of skepticism.

Its not an assumed issue, we know what the issue is, just because you haven't had the issue doesn't mean no one does, this isn't a back yard job, issue came up on a dyno at a well known and very good shop, and confirmed by the tuner

I was only asking if any one had experience with it and if any one had a fix

Disabuse yourself of the assumptions you've made regarding my perception of you, your car, your tuner, your setup, etc. They're all incorrect. I took the limited information you provided, called on my knowledge of similar setups, and gave the best advice I was able to give.

I've been playing with boosted BPs for the better part of a decade. I'm not new to this community or this engine. If I haven't personally encountered an issue or known someone who has encountered an issue, I can confidently say that it's not a common issue. I've seen multiple 450+whp cars on stock MLS gaskets that don't lift cylinder heads, so when you tell me with 100% confidence that you lifted your head at 400whp, what am I supposed to think?

If you really have lifted the head, and your friend has encountered the same issue and has a fix, and you came here looking to see if anyone else has the problem, your question has been answered. It's not common, and you and your friend are the only two people I've personally encountered that have had this issue. Instead of assuming that we're insulting you by being justifiably skeptical of the problem you're having, it would be awesome if you would share the fix for the issue so we can all learn something from your car and setup.

Ive been playing with BPs for 10 years too.
I love the thing, that's why I stuck with it, but threw the gearbox in the rubbish about 8 years ago now.

I have done something similar to this:
The great ARP Head Stud Washer debate
I read this thread which lead to an investigation which shocked me.
I then created a fix.

To be fair my first engine I only torqued to 60ftlb due to the many "miata fourm" threads I read about the head crushing, where as ARP said 70-80ftlb?
To compare people building 4G63 engines in NZ are using L19 ARP studs at over 100ftlb. This is for 500WHP+ street cars.

I had a friend with a RB26 Skyline GT-R that only pressurized the radiator into the overflow at high boost. It was a blown headgasket that didn't leak at other times except high boost.

I live 12 miles from the guy with the 633whp drag Miata with a BP05 who hasn't lifted the head. Can you honestly blame a guy for being skeptical that it isn't simply a HG problem? It's just not something we've ever seen.

I got the same disbelief when I told people I had dropped an oil sprayer, so I posted pics. People here are fair. If they call bullshit, just answer their questions and they'll come around.

So basically, wider washers, eh?

Oh shut up. I posted my 398hp dyno sheet. From when i was running a little gt3071 which is btw an excellent hairdryer for prepubescent females and illegal immigrants. That was at 21psi, sea level.

Yes, being the living embodiment of God's hatred of the BP, I repeatedly ran 44psi peak boost. I also sprayed the liquid volume of lake erie in meth into the motor at the same time. So that means my cylinder pressures were omgg soooo high cus i was burning alcohol and alcohol burns when I swab my eurethra therefore fuck you, no, cylinder pressure = hp so for a given amount of hp you have the same damn pressures, assuming the same motor. This asanine proposition entirely deserves the previous run on sentence.

Fyi your car is really cool but OP you and your mad skilz tun3r r ignoring r&d and the measured results. My car is full of hate but I ran a stock Mazda HG w/ arp regular not oversized studs. By the way.. Regarding cyl pressures my motor has indeed seen its share of detonation because Fuck You and still had no Olympic Lift HG.

This is just on data point but the current highest hp miata that actually functions like a car vs garage ornament is Soviets <tagg-] and he has a stock hg too. I think you fucked up w the copper Condom hg buddy

That or you are just too damn nice to the car. Come on. Treat it like a woman.

I'll widen yr washer bae

It's good to see that Fae has recovered his account from whoever hijacked it recently and used it to post nice things. :D

And I'll make your head lift.

:rofl:

one time i didnt torque my head down well and blew out a brand new head gasket.

100% head lifted.