Toyota MR2 AW11
That white, powdery stuff there is aluminium oxide. And it’s baaaaad.
While being washed for those technical coatings, something happened and insides of the cylinderheads got exposed to washing agent. Aluminium reacted with washing agent and end result was aluminium oxide.
Aluminium oxide is that same stuff that is glued to paper to make sandpaper. Wonder what it would do inside my engine if left there…?
Nah, I’m taking it back to the coating company 🙂
This is what I came up with Wisecos calculator. Why o why is the calculator using both imperial and metric??
ok, anyhow, my guesstimates were between 10.5:1 and 11.9:1. With stock values I got 11.1:1, which sounds just perfect.
Slightly related, I just read about an aquaintance of mine who had used 135mm long conrods instead of stock 122mm in his 4A-GE. Wonder what kind of pistons he used…?
(they were custom made by Wiseco + longer conrods from auto verdi)
Oh! Edit 7.9.2017 – where did I get these numbers
Bore diameter: 81,5mm
Engine stroke: 77mm
Head volume: 36cc (stock)
Gasket bore dia: 82mm (HKS)
Compressed gasket thickness: 1mm (HKS)
Deck clearance: 0.7mm (about)
Dome volume: -5.9cc, compared to stock (Wiseco)
Here are some of the manufacturers I considered for my project:
Pistons: (CR numbers not exact)
Conrods:
Crank:
Head gasket: (havent yet ordered)
Better put this info up for later
ATM I can’t recall where I found the numbers, but with these I made my order to Auto Verdi and everything fits.
So, the stock 4A-GZE conrod measures:
Wrist pin diameter: 20mm Pin end width: 21.825mm Center to center length: 122mm Big end diameter: 45mm Big end width: 21.825mm
Widric found this! Pretty sure that I will install this into my car.
The 20 valve silvertop in pieces.
Got this about a year ago, but later found out it was missing all the lifter cups. Found a set of lifters from ebay this summer.
I was thinking that this will be my evolution version whenever I start to building one 🙂
Hmm, what else…?
Update 27.8.2017:
Critical things missing – copied from earlier post
Ok, this thing had bothered me some time. One of the intake pipes had been spraying oily mist around the engine bay. Being lazy, this took me some time to fix.
There is a second problem too. Every time I floor the car for a longer time, the whole car smells like belts were slipping, but it goes away pretty quick. No idea what that is.
Meh. A mess and I spent a whole day cleaning and sweeping.
First peek into my custom intake plenum! Parts are from a different prototype, but they were good to get some needed measures.
Pile of bits and parts. Trying to keep everything in order.
Widric the dwarf viking came to garage to check some wheel options.
His stock 16″ wheels from the older Impreza didnt fit over the 4/2 brakes, so we tested the Advan Sienas as well.
Advans were spot on. Except the bolt pattern.
Widric has a set of 5×100 -> 5×114.3 spacers, but alas, the wheel poked out too much. You can see the frustration on his face 😀
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.