Peanut Bait

[Aussie_KE70]

  On 11/27/2013 at 9:55 AM, oh what a nissan feeling! said:

reed your welcome to come over and put my wideband on it, would be a good idea to check the afrs. you will need a spare bung in your dump pipe, and a working cigarette lighter though.

 

you can also use the sensor clamp that attaches to the tail pipe, and use a generic cig lighter socket with extension wires from the battery. This is what I use to tune and check carby vehicles.

[B.L.Z.BUB]

Should maybe install an O2 sensor before we get too carried away. Just want it running first.

[oh what a nissan feeling!]

  Quote

you can also use the sensor clamp that attaches to the tail pipe, and use a generic cig lighter socket with extension wires from the battery. This is what I use to tune and check carby vehicles.

 

I am aware of this, but have no use for either contraption on my own cars, so therefore have no said contraptions.

 

Head gasket thickness can alter compression ratios a fair bit, best do your research reed.

[B.L.Z.BUB]

Good point,I actually need this one (81mm) the other is 83mm.

I think I should shell out for ARP bolts. Will put off being able to get it back on the road though.

[Aussie_KE70]

  On 11/27/2013 at 10:39 AM, oh what a nissan feeling! said:

I am aware of this, but have no use for either contraption on my own cars, so therefore have no said contraptions.

 

Head gasket thickness can alter compression ratios a fair bit, best do your research reed.

 

All I can do is give a first hand account of real world tests that I have done on my own engines. My last turbo motor I was chasing to run more boost, I had already forged bottom end and I did not want to buy new rods or pistons, so I opted for a thicker head gasket. The engines static compression was already 8.5:1 and on a wet compression test, reading were 160psi. I opted for a 3mm thicker head gasket over factory. it changed the static compression ratio to 8.4 and on a wet compression test and dropped cylinder pressures to 155psi.

 

On my current motor NA motor, it is static compression ratio is 11.5:1 and with the thinnest MLS head gasket avalible it only rose to 11.7:1, In the grand scheme of things it has done very little to the over all performance. I can not even feel the difference driving the vehicle.

 

Keeping in mind most manufactures specs for compression allow for 10 - 30 psi variance between cylinders before the engine requires a rebuild.

Edited November 28, 2013 by Aussie_KE70

[B.L.Z.BUB]

I'm tossing up selling it now. I don't know how much money I want to keep throwing at it. Its never ending. And doing 2 on 2 off at work I never drive it as my 2 weeks off is spent fixing it.

 

I'll pull the head off and inspect the damage and go from there. Hopefully the fact it has cams means the head has been off and the head bolts were upgraded and will be re-useable.

Edited November 28, 2013 by B.L.Z.BUB

[oh what a nissan feeling!]

 

A 3mm head gasket in a 4agze for example would take the compression down to approx 7.4:1.

Now if you went to 3mm thicker than factory , like you claim, then the compression ratio would be approx 7:1, the car would barely start.

 

Going from a .8 head gasket to a 1.2 would take your from approx 8.9:1, down to 8.6:1.

 

Or from .8 down to a .6 would take you from approx 8.9:1 up to 9.1:1. Seems significant to me.

 

 

 

 

[B.L.Z.BUB]

I havent been doing much research as my internet out here is shit but I think the stock is 1.2mm? I have been told a MLS gasket may be overkill unless I deck the block? Still researching gaskets. Found some TRD ones for around $150 but they are only 0.5 and 0.8.

 

While I don't mind learning this shit it is getting tedious :P And the worst bit is those 1000m of boost was the biggest tease ever.

 

Know somewhere good on the coast to get the head skimmed Matt?

[Aussie_KE70]

  On 11/28/2013 at 11:19 AM, oh what a nissan feeling! said:

A 3mm head gasket in a 4agze for example would take the compression down to approx 7.4:1.

Now if you went to 3mm thicker than factory , like you claim, then the compression ratio would be approx 7:1, the car would barely start.

 

Going from a .8 head gasket to a 1.2 would take your from approx 8.9:1, down to 8.6:1.

 

Or from .8 down to a .6 would take you from approx 8.9:1 up to 9.1:1. Seems significant to me.

 

I had a typo above it was .3mm over standard. But my original statement still stands.

 

Matt you are going away from the original question and being counter intuative, which was

 

  On 11/21/2013 at 8:00 PM, B.L.Z.BUB said:

Can anyone give me advice on what thickness head gasket I should get? Should I stick with a standard thickness or go slightly thicker with the increased boost?

 

and as I stated that the thicker headgasket would not achieve what he was wanting and it was a waste of time and it is a fawled approach. Not to drop the head gasket size down to 0.6mm uncompressed.

 

Also Reed the OEM head gasket thickness for a 4AGZE is 1.2mm compressed

Edited November 29, 2013 by Aussie_KE70

[BUZ440]

Did you get the engine mod plated?

 

Have not quite read back enough to see

[B.L.Z.BUB]

Was already plated for performance upgrade, just need to put new engine number on rego.

[B.L.Z.BUB]

So after some research I decide to buy a genuine stock Toyota head gasket. From what I was reading it should seal far better than MLS or a TRD one without decking the block. Plenty of people have run oversized pulleys on stock gaskets and been fine so hopefully I will too.

 

Its a killer being so far from home and not being able to work on it. 3 more days...

[B.L.Z.BUB]

They accidentally sent me two :)

 

 

Will pull the head off tomorrow. Need to order head bolts too but I don't get paid until Thursday.

 

Got some pins too

 

Edited December 10, 2013 by B.L.Z.BUB

[B.L.Z.BUB]

Remove all the things.

 

 

Can get this out in about 10 minutes now ;)

 

Ruh-roh. Need a linish.

 

 

Got this far before I realised none of my sockets are long enough to reach the head studs. Good excuse to stop for the day.

 

 

What a mission.

[ke70dave]

yeah also you need a skinny socket for the head bolts. I had to buy a 3/8 one (with a 1/2 to 3/8 adaptor for my 1/2 socket wrench.)

 

nice progress though!