4x4

hi all.

as the head has to come of for some work i need to change the head gasket.

why would one choose a certain thickness to use over others?

engine in question is SR20DET, if spec is needed to help answer what thickness i should go for just ask

theres a few thickness's, 1.1mm, 1.6mm, 1.9mm, 2.0mm and have no idea what pro's and con's all these sizes have if any.

any help and info would be appriciated

AlexF

skylineowners.com

Toe Knee

iTrader: (2)

one main reason would be to compensate for skimming of the head to re cover lost height bit using a bigger gasket, another would be to change the comp ratio etc

rsnissan

iTrader: (9)

whats the rest of the spec? 1.2mm should be ok if not too wild

coleman

I thought the sr20det was the Pulsar/sx engine and the skyline was RB26?

Chip

iTrader: (3)

Err, they use the RB series of engines mate

Chip

iTrader: (3)

Thinner = higher compression
Thicker = lower compression

There are some other mild effects, such as squish band changes etc, but they arent likely to effect you in any way that matters.

Ask the person mapping the car what CR they want it to be for the spec of your other parts, and go for the gasket that gives the closest to that.

Or if its a standard engine on an off the shelf chip intended for standard compression, go for the one that gives nearest to standard compression.


So essentially, I cant actually recomend a particular one im afraid and I dont really see how anyone else can without you giving a LOT more information!

4x4

thanx for replies lads... except for the skyline one, lol

chip the car is not getting tunes, only the head has to come off to get snapped ex manifold studs drilled out, also one has been cross threaded

failry basic spec, turbo elbow, 3"ex pipe, tubular manifold, boost controller, 1.0bar boost!

4x4

makes sense,

AlexF

same basic arciteture and LOTS of knowleadge nissan people/tuners on there...

unlike on passionford

Chip

iTrader: (3)

If its not getting tuned/mapped then just fit a standard thickness gasket.

Christian and Beccy

iTrader: (14)

Seriously, if you're not skimming the head and not planning more than 350bhp, fit a STANDARD gasket.

4x4

but will i not be able to run higher boost with a thicker gasket?

sound like a bit of a chav saying that but would love to be holding over 1 bar of boost, avcr is set to 1.2bar but cant even peak 1bar! probably something else to address in regards to the not holding boost situation.

4x4

naa, tech posts dont get answered on sxoc serious

Chip

iTrader: (3)

No a thicker headgasket wont allow you to run more boost on the standard map

Christian and Beccy

iTrader: (14)

Standard T28 doesn't love much more than 1 bar. 1.2 bar will help it on its way to 'game over'.

4x4

ahh! so what turbo for more boost? then we're looking at injectors too yes?

4x4

thanx

Christian and Beccy

iTrader: (14)

GT28R or GT28RS, 300bhp and 320bhp respectively. (roughly, depends on rest of spec).

What power do you want? For any of the turbo's mentioned so far, I'd still fit a standard head gasket.

xrsi

iTrader: (1)

if you are unsure then use a vernier to measure the one thats come off....

then just order the same, but as its been said if its not going for big power just order a std one.

Christian and Beccy

iTrader: (14)

It's not that hard to be honest.

If it's got a Nissan logo, then it's a standard gasket. If it hasn't then it's most probably got a logo of whatever make it is and a part number.

My opinion is still as above, regardless of whats in it now, fit a standard gasket for sub 350bhp.