BLK-TOP SR20DET headgasket !! ==>

[SR BEAST]

Guyz, my headgasket is burnt and i have to change it now !

but nissan dealers here don't have the sr20det headgasket,,they only got the gasket of the SR20DE from the bluebird ! so does it fit my car and will the compression differ ??thanx

[FTRS14.5]

While your at it, you might as well as upgrade it to a thicker one. It'll save you the hassle later.

[Onizuka]

many of our sponsers have metal head gaskets for the SR20DET:

http://www.heavythrottle.comhttp://www. ... racing.com

[Dori Dori]

While your at it, you might as well as upgrade it to a thicker one. It'll save you the hassle later.

'Upgrade' and 'thicker' should not go hand and hand.

[FTRS14.5]

'Upgrade' and 'thicker' should not go hand and hand.

Huh? What do you mean?? I might be missing something here, but isn't upgrading the headgasket to an aftermarket one normally mean putting a thicker/better material gasket? Don't mean to argue with you or anything, but I would just like to know what you mean by this.

[NeedCAforS13]

aftermarket metal headgaskets are often considered better, but you can get either thicker or skinnier than stock depending on what you want. Thinner and you will raise the compression for better response but increased risk of detonation, thicker and you will lower the compression for the ability to run higher boost more safely.

Sean

[FTRS14.5]

That's what I thought. I just didn't understand what he meant by his post. Thanks for the clarification.

[VitaminT]

Does anyone know what the stock headgasket thickness is? This will probably help if he wants to get a thicker or thinner than stock.

[Onizuka]

1.1mm

[Dori Dori]

That's what I thought. I just didn't understand what he meant by his post. Thanks for the clarification.

Lowering compression by getting a thicker head gasket is just lame to me. Why would you want to lose streetability? I'd understand if you're shooting for 400+whp...it's a good safety precaution. But to call it an upgrade is just wrong IMHO.

[f150intally]

Depends on how you look at things. It is an upgrade if you want to run a head gasket that can handle more boost. It is certainly constructed of upgraded materials.

It all depends on how you define "upgrade." Holds more boost and better materials may be considered an upgrade by many.

-Jay

[Dori Dori]

Uhh, no. You can get a metal headgasket that is the same thickness of the stock gasket...then you won't have to worry about losing compression (hence a loss of power and responsiveness as well). It would be an upgrade b/c of the reasons you stated. I was talking about thickness alone and was simply informing the poster that thicker does not equal petter performance.

[Dori Dori]

1.1mm

According to Phase2 it's .8mm

[FTRS14.5]

But by going thicker, you would be able to attain a higher boost level safely correct?? So wouldn't that be considered an "upgrade" since it's helping you get higher HP numbers, which is basically almost everyones goal? Doesn't this apply to almost every mod? Bigger exhaust piping, bigger cams, bigger turbo, bigger injectors, bigger MAF, and the list goes on. So why wouldn't a thicker (bigger) gasket be considered an upgrade if your main goal is to get higher HP? Yes, you can do it without going thicker, but a lot of people just do so they have a "safety blanket". Don't think I'm trying to flame you or anything, but this is my opinion and maybe the opinion of others.

[180fan]

The metal stuff doesn't blow as easily as the stock gasket. Next thing, if you increase thickness, you can run more boost safely, but not too much more. Disadvantage of running a metal head gasket is that if it's too thick, you run the risk of losing a bit of power unless you can fill that differnce of volume with more gas and air.

[VitaminT]

Thicker head gasket=lower compressionLower compression=less powerSlightly more boost =slightly more powerThereforethicker HG and slightly more boost=stock thickness HG and less boost

Wow, we really didn't make a whole lot of groud there. I think the guy about had it right. If you are aiming at extreme power levels and are thinking of lowering compression to 8.0 or something anyway the thicker HG is a good idea as a cheaper alternative, but for MOST people the stock thickness is okay to go.

[Onizuka]

According to Phase2 it's .8mm

Can you link me? I havent seen it on any site, and almost all aftermarket headgaskets i see for the SR20 are 1.1mm (the only other i see is the 1.2mm Grex headgasket)

[Dori Dori]

http://www.store.yahoo.com/pha....html

[Onizuka]

Ah, thanks!

[Dori Dori]

For all you people jabbering about thicker head gaskets being able to allow the engine to make more power, safely. You are right but you are wrong. It only allows the engine to make more PEAK hp, safely. What does that mean? Less responsiveness and slower spool witch equates to a smaller power band. That's not an upgrade to me...maybe a drag racer or someone who's only going for peak hp, but definitely not if drivability is an issue to you and you like doing things like auto-x and drifting. Probably more than 90% of the people on this board use their cars everyday and enjoy a little responsiveness. Why do you think everybody is looking for the fastest spooling, highest hp turbos that they can buy? It's what people want.

Now if you guys arguing against me live your lives a 1/4 mile at a time, then I understand why you would consider this an upgrade. If not then I'm confused.

[Nathan]

Also, the issue of quench area should not be left out of the picture. A thicker headgasket compromises the detonation reducing properties of the quench pads designed into the SR's combustion chambers. It's possible that by lowering the compression ratio but also reducing the effectiveness of the quench pads, you would gain minimal, if any detonation resistance.

[Onizuka]

would the fact that my headgasket is .3mm thicker than stock really effect my c.r. THAT much?

[Dori Dori]

..

[Onizuka]

Informative :P

Just cause im a mod doesnt mean i know everything, more of a post cleark than anything else (just to be totally honest)

[f150intally]

At a certain horsepower (maybe around 350rwhp), the reliability of a stock gasket is thrown out the window as are the stock head bolts. If a car has a GT25R or a T3/T4 boosting 18PSI, it is not a question whether or not to replace your stock headgasket and head bolts. It is a necessity. The 1.1 and 1.2 mm head gaskets are the most popular replacement gaskets. A by-product of putting a thicker head gasket on is obviously a lower compression ratio.

I think this whole discussion started based on one person's definition of "upgrade."

I don't care if you are a drag racer, top speed racer, road racer... if you are making 350-400 whp, you need a better head gasket. That was my only point. Not once in my post did I mention anything about compression ratios. Metal Head gaskets can handle more boost... yes or no?

If yes, would you consider it an upgrade?

- Jay

[Dori Dori]

(TO JSPEC) Haha, no I had mentioned the clearance between the piston at TDC and the quench pad but I may have been wrong so I took it down...It was in response to the previous post (notice my post was only 1 min after you).

[Nathan]

An interesting page that talks a bit about quench in relation to an SR motor: http://www.se-r.net/about/200s....htmlThe applications are different but the theories are the same between boosted and NA Oh, and it's ~.045 inches clearance for the quench pads from what I understand.

[Dori Dori]

At a certain horsepower (maybe around 350rwhp), the reliability of a stock gasket is thrown out the window as are the stock head bolts. If a car has a GT25R or a T3/T4 boosting 18PSI, it is not a question whether or not to replace your stock headgasket and head bolts. It is a necessity. The 1.1 and 1.2 mm head gaskets are the most popular replacement gaskets. A by-product of putting a thicker head gasket on is obviously a lower compression ratio.

I think this whole discussion started based on one person's definition of "upgrade."

I don't care if you are a drag racer, top speed racer, road racer... if you are making 350-400 whp, you need a better head gasket. That was my only point. Not once in my post did I mention anything about compression ratios. Metal Head gaskets can handle more boost... yes or no?

If yes, would you consider it an upgrade?

- Jay

Yes you did mention c/r ratios because a thicker gasket decreases them. If you didn't know that, now you do. That's what I was talking about, not the effectiveness of the metal gaskets themselves. And a little fyi, enjuku's car is making 550whp on stock head bolts.

[Dori Dori]

An interesting page that talks a bit about quench in relation to an SR motor: http://www.se-r.net/about/200s....htmlThe applications are different but the theories are the same between boosted and NA Oh, and it's ~.045 inches clearance for the quench pads from what I understand.

If you saw what I posted before I erased it, I was close...I said about 1mm...guess it's a little more. I have that issue at home and was trying to remember what it said...thanks for the link though!

[FTRS14.5]

That's all that I was saying too...... if a part helps get more power or whatever you are looking for, is it considered an upgrade? Of course, certain things will be sacrificed, but will that product help you get to your goals? So once again is it an upgrade? Yes, no, maybe so. All depends on the eye of the beholder.