New pistons from Matrix Garage

As the title says 🙂 Also, I got two Cometic MLS headgasket to choose from.

The box assistant was with me at the unboxing. Weirdly enough, her food comes in a box that is similar in size to this box. Wonder if she was actually looking for food? I know she has good memory.

One of the pistons. Designed by Yoshi at Matrix Garage, manufactured by Traum Pistons. These are MG’s shelf pistons, 81.5 oversize and with stock 1.2mm headgasket CR should be 10.5:1.

I’m going to use a 0.76mm headgasket. CR should be somewhere around 10.9:1 with that.

Some deburring is still needed. I’m going to get the same coatings on these pistons what I got for the previous ones.

4A-G headgaskets

Some of the headgaskets available, both 16V and 20V. Cometic hgs are available in every color of the rainbow and I didnt list them all.

Edit: added Toda. I didnt know they had HGs 🙂

Edit 2: the information below can be outdated or wrong.


Toyota 11115-16070 ?? 1.2mm (original)

Supertech HG-T4GE-83-1T 83mm 1mm 
Supertech HG-T4GE-83-1.3T 83mm 1.3mm

Je gasket TY1001-039 81mm 1mm

HKS Stopper 2302-RT001 82mm 0.6mm
HKS Stopper 2302-RT002 82mm 1mm
HKS Stopper 2302-RT003 82mm 2mm

HKS Bead 2301-RT008 82mm 0.7mm
HKS Bead 2301-RT009 82mm 1mm
HKS Bead 2301-RT024 82mm 1.6mm
HKS Bead 2301-RT010 82mm 2.0mm

TRD 11115-AE814 82.5mm 0.8mm metal
TRD 11115-AE802 82.5mm 1.1mm carbon
TRD 11115-AE824 82.5mm 0.5mm metal

Cometic C4166-040 83mm 1mm MLS
Cometic C4166-045 83mm 1.14mm MLS
Cometic C4166-051 83mm 1.3mm MLS
Cometic C4166-080 83mm 2mm MLS
Cometic C4166-120 83mm 3mm MLS <-seriously?

Cometic C4170-040 81mm 1mm MLS
Cometic C4170-045 81mm 1.14mm MLS
Cometic C4170-051 81mm 1.3mm MLS
Cometic C4170-080 81mm 2mm MLS
Cometic C4170-120 81mm 3mm MLS <-seriously? 

Power Enterp … 82.5mm 0.7mm bead

Toda 12251-4AG-006 82.5mm 0.6mm stopper
Toda 12251-4AG-008 82.5mm 0.8mm stopper 
Toda 12251-4AG-010 82.5mm 1.0mm stopper 

TRD 11115-ae001 82.5mm 0.8mm

Cometic H1090SP3040S 81.5mm 1mm ??

Cometic C4605-040 83mm 1mm 
Cometic C4605-051 83mm 1.3mm 
Cometic C4605-060 83mm 1.5mm

Cometic C4604-040 81mm 1mm 
Cometic C4604-051 81mm 1.3mm

HKS Stopper 2301-RT038 82.5mm 0.6mm

Parts from coating

Got some parts back from coating!

Cylinder head has some white crud all over it. No idea what it is and how to get it off.

Valves and everything (I mean everything, even the plugs) were coated in heat resistant stuff. Outside, cylinder head got a coat of stuff that helps heat to radiate away from it.

This is a Ferrari F360 flywheel if I remember correctly. Widric found it from our stash. 🙂

Pistons got three different coatings on them. Top of the piston was coated with heat resistant, skirts with friction stuff and the underside with that same stuff as cylinder head that will radiate heat away.

Some bits are now sandblasted and powdercoated. I will have to find some nice paint(s) to do the letters.

Not pictured here are the new camshafts, all the bearings and the block. Camshafts and bearings got a coat of that friction reducing stuff, while the cylinders were rubber with tungsten powder to… well.. reduce friction 🙂

I will get my exhaust manifold and turbo coated as well.

Piston rings + crank girdle

Checking pistons and rings:

Gap on fourth cylinder is 0.35mm.

Pistons seem to fit into block. That is a good thing.

A package from Manon Racing Products arrived, containing Toda timing belt and oil pump gears, N2 style additional timing belt tensioner (or guide) and a crank girdle.

Timing belt tensioner. Fitment is very good.

And the crank girdle. A serious piece of hardware. I needed only some stiffening but now the engine will be bombproof.

Veeery nice 🙂