how much boost and hp CAN a stock hg take anyway
- Thread starter JDM 1JZ
- Start date
JDM 1JZ said:
#1, the TSRM doesn't state to do it. #2, would you want to glue both sides of a headgasket made of glorified cardboard to items that will be moving in different directions? That's a recipe for disaster.
well i dont like reason number one to be honest because just cause something says its not to be done doesnt mean anything i was looking for a littl extra i thought it would help better since its used on the metals and what not, but ur number 2 reasoning is good, howcome people do it on the metals though?
N
NDBoost
Guest
NDBoost said:Because metal HG's dont rip like paper:naughty:
then thats settled, well actually one last bothering question i promise haha. the composites stick anyway so why wouldnt they rip up over time, i mean if they didnt stick like glue there wouldnt be so much clean up needed, or is that just plain stupid sense haha i promise that was it
I coated my new toyota headgasket with the copper spray (permatex) when I rebuilt my last engine 3 yrs ago. I recently pulled the engine again and pulled the head off and the head gasket was still in great shape. I plan on coating my new one on this rebuild as well. It may help, and it may not, but from my experience, and from others that have actually DONE it, it doesn't hurt anything.
oldskool-nick said:
Well, I guess congrats. But why would you feel the need to coat it? If you can't get a seal with a composite headgasket, something major is wrong.
i was just lookign for extra security i figured everything could be strengthened up a little but using a real sticky spray and since its cardboard it would act as glue, and ontop of the fact that the composites stick and u put the spray there acting as glue it would act as bullet proof as u can make the composite gaskets
how much power are you making nick? turbo upgrade boost ur running and such?
how much power are you making nick? turbo upgrade boost ur running and such?
N
NDBoost
Guest
very good point it does not hurt to have an extra layer of protection. Just like it technically isnt required to use permatex or copper spray on a MHG install. but its not a bad idea.JDM 1JZ said:
If it doesn't hurt the head gasket use it. Its only another $100 for the HG anyways if it breaks
i think bishop ran 20+ for who knows how long (i know it was over a year, i think) on the toyota gasket
I'll throw some info into the mix here.
I was running 20+ PSI on a composite Toyota head gasket and blew it up. Detonation was the cause of my problems, blew the gasket out into the water jackets. I don't know exactly what power levels this started to be a problem, who knows how long before I turned it up to 20psi it actually started to detonate, and for that matter, I've never been on a dyno so I don't know what power levels I am running.
The spray that I like to use on gaskets is Permatex Brake Quiet - it comes in a spray can and is blue. I've used it on both composite and metal head gaskets.
My personal opinion is that the stock head gasket should be fine to at least 700rwhp - as long as the tuning is done correctly. A MHG is just extra insurance that lets you run lean enough to detonate for a little longer than a composite one, and DSMs run a 2L 4 cylinder turbocharged engine with stock headgaskets to well over 500hp at the wheels with no problems. Add another 50% displacement and we should be capable of over 700. The DSM crew also has easy methods of tuning to avoid detonation, which we have no access to, so that may play a factor.
As for head bolts / studs, stock bolts are fine to 72 foot pounds, and can theoretically be reused as even at 72 foot pounds they are still not torque to yield OR in the plastic region for their alloy. That said, ARP hardware is NEVER a bad idea, especially as it only costs marginally more than OEM parts from Toyota and is almost an order of magnitude stronger.
I was running 20+ PSI on a composite Toyota head gasket and blew it up. Detonation was the cause of my problems, blew the gasket out into the water jackets. I don't know exactly what power levels this started to be a problem, who knows how long before I turned it up to 20psi it actually started to detonate, and for that matter, I've never been on a dyno so I don't know what power levels I am running.
The spray that I like to use on gaskets is Permatex Brake Quiet - it comes in a spray can and is blue. I've used it on both composite and metal head gaskets.
My personal opinion is that the stock head gasket should be fine to at least 700rwhp - as long as the tuning is done correctly. A MHG is just extra insurance that lets you run lean enough to detonate for a little longer than a composite one, and DSMs run a 2L 4 cylinder turbocharged engine with stock headgaskets to well over 500hp at the wheels with no problems. Add another 50% displacement and we should be capable of over 700. The DSM crew also has easy methods of tuning to avoid detonation, which we have no access to, so that may play a factor.
As for head bolts / studs, stock bolts are fine to 72 foot pounds, and can theoretically be reused as even at 72 foot pounds they are still not torque to yield OR in the plastic region for their alloy. That said, ARP hardware is NEVER a bad idea, especially as it only costs marginally more than OEM parts from Toyota and is almost an order of magnitude stronger.
well said grim, and thanks for the feed back from everyone. i myself am a dsm and your reasons are exactly what made me wonder about composite gaskets on the supra, how long did u last on high boost before u obviously relized u detonated for whatever period of time
its still a good idea to get the head decked right? since its not even on the car?
its still a good idea to get the head decked right? since its not even on the car?
It's well worth it to get the head checked, and if it's out, get it decked.
I ran mine on high boost for over 6 months. However, I totally destroyed 2 pistons as well as the head gasket - blew the ringland away for at least 35% of the circumference of the piston on the bad one.
I ran mine on high boost for over 6 months. However, I totally destroyed 2 pistons as well as the head gasket - blew the ringland away for at least 35% of the circumference of the piston on the bad one.
Just so everyone else knows.
I too am running on a replaced OEM HG, with toyota bolts, torqued to 74 ft/lbs.
AFR's are closely monitored, and I have never detonated.
20+psi for YEARS on a 60-trim CT.
Hasn't blown yet.
I too am running on a replaced OEM HG, with toyota bolts, torqued to 74 ft/lbs.
AFR's are closely monitored, and I have never detonated.
20+psi for YEARS on a 60-trim CT.
Hasn't blown yet.