Toyspeed.org.nz Message Board

by **blitza** » Fri Jul 02, 2004 1:46 pm

so yeah, any of you chaps got a headgasket out that you can measure the thickness of??

I'm getting a copper job made, but I need to know the thickness of the factory one, also if anyone can take a picture as well, ta

by **MrBob** » Fri Jul 02, 2004 2:13 pm

can measure for you 2night. why dont you just buy an st205 one. Is metal, and identical to trd one. same part #. Only cost about $80 or less. Or are you O-ringing it, hence the copper...?

by **fivebob** » Fri Jul 02, 2004 2:50 pm

Don't O-Ring your block or use a copper gasket unless you want it to blow, the Alloy head & cast iron block move too much in relation to each other and the copper gasket will work harden and leak.

Use the stock gasket it's good enough for 30+psi and doesn't require any block/head mods like O-Rings. Far cheaper in the long run.

by **Malcolm** » Fri Jul 02, 2004 8:24 pm

FWIW stock thickness is supposedly 1mm

by **blitza** » Sat Jul 03, 2004 11:07 pm

ta all, was hoping for your input bob of five, umm there was damage to the head so had been planed 15 thou, so was going to do the copper thing to make up the difference, but then learned of the need to o ring, was going to machine o ring relief in both the head and the block, but was still concerned aboot work hardening, (and the cost)
am happy to live with the extra compression, as the new pistions should take care of that. the only thing would be cam timing, (unless I use a shim) pros n cons anyone?

by **fivebob** » Sun Jul 04, 2004 3:14 am

.015" = 0.38mm not going to effect your cam timing enough to worry about, by my rough calculations < 0.8° advance, and at some point in time you'll probably want to go to adjustable cam sprockets and aftermarket cams anyway.

Blitz & HK$ make 1.6mm headgaskets not exactly cheap @ 18,000 & 27,000 Yen respectively. TTE used to make them in 1.0,1.2 & 1.4mm but they may no longer be available

With the stock pistons & gaskets that will give you an CR of 9.1, with your pistons I don't know but figure on an increase of approx 0.1. A 1.6mm gasket (assuming 1.0mm stock) would give you approx 0.05 decrease.

by **TWSTD** » Sun Jul 04, 2004 10:13 am

what pistons did ya get Blitza?

by **blitza** » Sun Jul 04, 2004 3:57 pm

got wiseco pistons, haven't got the numbers on me, but there is a drop in compression which I don't really want. Eagle rods should be here this week, but then there's the three week wait on the oil pump from japan.

by **TWSTD** » Sun Jul 04, 2004 7:13 pm

How come the compression drop? You can get 9:1 comp ratio forged pisons can you not? Are these pistons maybe from an earlier generation 3sgte? If you could let me knwo the part no's that would be good :-)

thanks\

AL

by **blitza** » Mon Jul 05, 2004 11:18 am

hey horse, I got hte pistons as
kit #k552m865,
Pistons #6552m865,
bore size 3.4055

I may have been a bit off with my compression height thing, but they are dished a fair bit more than std (! why dont I take a pic!)

by **blitza** » Mon Jul 05, 2004 2:47 pm

by **fivebob** » Mon Jul 05, 2004 3:05 pm

Judging from the last photo the piston top to pin is the same height, so they will be lower CR, what's the depth and diameter of the dish? I can work out an approx CR from that if you don't already know it.

by **blitza** » Mon Jul 05, 2004 3:06 pm

this post is no longer relevent

by **fivebob** » Mon Jul 05, 2004 3:09 pm

blitza wrote:bah!?

Try this

by **blitza** » Mon Jul 05, 2004 4:46 pm

3.6 deep, 68 dia, and yes the pin is at the same height. (whats the code for posting a pic)

by **fivebob** » Mon Jul 05, 2004 5:00 pm

blitza wrote:3.6 deep, 68 dia, and yes the pin is at the same height. (whats the code for posting a pic)

Even allowing for the valve pockets on the std piston that's about 7.8:1, so with your planed head I'd estimate 8:1, should be able to run megaboost.

Code for the pics is the [img] tag, it's just that you need to know the name of the image, not the webpage which is what you posted. To find the name of the image right click on it and select properties (if you're using IE)

by **blitza** » Mon Jul 05, 2004 7:41 pm

MMmmmmm, I suppose ya cant complain too much aboot a bit of a safety margin, althou decompression is something I don't really believe in, we can't really get consistent good fuel in nz, so what can you do? should make a good tow car........

Thanks for your help, is that a ferrari on your avatar?

Website · by Al » Mon Jul 05, 2004 7:59 pm

avgas is the answer :wink:

by **blitza** » Mon Jul 05, 2004 8:17 pm

hrmmmm, Licenced Aircraft engineer+Limited company+bp fuel card+room for barrel storage, hrmmmmmmmmm

Website · by Al » Mon Jul 05, 2004 8:22 pm

Just make sure you get a lead friendly oxy sensor if you have to use one

Toyspeed.org.nz Message Board

3sgte head gasket thickness

3sgte head gasket thickness

Who is online