JDM TEMS, Corona 162 - 2 & 4 door and many more jdm oddities

TTE mirror deflectors

Well I'm sceptical -
The guy who sold them told me they came off one of the WRC cars in 1989, they were supposed to improve aerodynamics as well as keep the mirrors clean, reduce glare etc


Why I'm sceptical
1)The WRC cars sedom had 2 mirrors, in the pics I've yet to see these fitted
2)In the beginning they had US type mirrors but later were fitted with only one F1 type mirror


The scary thing is they appear to have the TTE marking on them? - and no p/n

You decide?

 

Clevite 3S-FE 0.50 pistons

Next you guys will be wanting my original 1991 NZ WRC Rally, Sainz/Moya competitors entry card :naughty
I love finding unusual stuff like this and then trying to figure it out

Here's something else I've never seen before - has anyone?

That's right, when last did you see someone rebuild a 3S-FE


The theory behind buying them went like this -
Cut 3mm off the tops, Fit a 5S crank with 2.5mm more travel, The pistons would then resemble 2JZ pistons and take a hellava lot of boost. The thicker rings would last longer in a high stress situation too.

Anyway they're up for grabs - make an offer

 

So you're saying stock GTE pistons are shite? These are way thicker with thicker rings.
With a lower compression ratio (ie 8-1) you can run higher boost and have the same effect as a higher compression piston (ie 10-1) running lower boost

Granted Forged is better - in a race engine!, but the price and expansion rate put them out of reach for "normal" use.
Cast pistons have metal re-enforcing bands inside and their expansion is a lot less which is why they are fitted as stock, wheras forged pistons need looser bores and tighter temperature ranges or they chew up rings and skirts very quickly

I've run cast pistons in race motors for years and only once burned a hole in one due to my own stupidity, they don't break unless you get you get your mix wrong (or boost) or starve them of oil

I've yet to see a set of forged pistons do 200 000km?

 

Yes, but with a GE/GTE head, 5S crank and 2JZ rods

I've got some Honda pistons to do that now, so what is a Toyota/Honda hybrid? - Toyhonda?

 

The Honda pistons have scary thin rings though.

There are a lot of really good 40yr old rock bands still going, I see Kiss/Motley Crue is doing a US tour soon and Aerosmith/Van Halen have new LP's coming out.

Bruce - How much you guys charge for the custom rocker covers?
I want to do something like this with a gen2 head but make it blue with YAMAHA on it instead of TOYOTA which is facing backwards.


I don't think Frankenstein will go down well with TEMS, she thinks she's a member of Toyota royalty :colbert

 

Why pistons crack and break, excessive blow-by etc

Oops, pressure and heat are two very different things -

Anyone who has powder coated an alu scuba cylinder will tell you that Alu breaks down at around 200degC and while it appears OK, the strength is gone - you are left with a potential bomb!

Increased pressures will cause an increase in heat, something to bear in mind before reaching for the boost dial

Pistons are cooled by intake charge on top and oil splashing from underneath, while the rings are used to transmit heat into the block as well as seal & scrape the cylinder walls.

The pistons themselves (cast) can withstand pressures around 500bar, but as anyone with a HP motor will tell you (ie Mafix) the rings start to lose the plot and excessive breathing (Blow-by) becomes a major issue - It's the same in a worn motor with bad ring seal (compression)

What happens is the rings can no longer keep the combustion charge above the piston and it leaks past the rings which not only heats the piston sides but prevents the rings from transferring heat as they would normally.
What this leads to is overheated rings and ring lands and inevitably the piston cracks - the same effect happens when the mixture goes lean (ie boost bumped without added fuel).
Top fuel dragsters will sometimes grenade a motor if it runs out of fuel before the ignition is shut off - etc, etc

So in effect it doesn't matter whether your pistons were stamped or cast, when they overheat the result will be the same.

Forged piston benefits
Forged pistons are a race option, for street use one needs to be extra carefull when machining the motor and longer warmups and much strickter engine cooling are required.
The forged pistons are machined to stricker tolerances in shorter runs and most companies offer a customising service for their pistons wheras cast pistons are usually a buy-it or leave-it mass production option.
Forged pistons are also lighter and don't have casting marks or ridges inside
The stamping process of a forged piston aligns the molecules and makes it stucturally stronger, however this does not make the alu more resistant to heat.



Ring check
An easy check to see what's happening in your motor is to take the rings out and twist them -
if the ring returns to it's original shape it's still good.
An overheated ring will stay twisted and also won't have any "spring" on the cylinder wall - compress them and they won't bounce back to their original shape either.

Oil squirters
Sometimes known as "piston coolers", their job is to deliver cooled oil to the underside of the piston.
The FE/GE has squirters built into the con rods (which could account for their longevity), but the GTE and later high performance motors have dedicated squirters which deliver oil to the underside of the pistons at higher rpm's only.
The block squirters are a better option as they are aimed at the exhaust (hotter) side of the piston and don't interfere with idle oil pressure, also they don't interfere with oil delivery to the big end bearings.



Over Fuelling
Initially the motor will feel more powerfull and responsive, but the excess fuel attaches itself to the cylnder walls and causes what is known as "Cylinder wash"
Oil is "washed" from the cylinder walls which causes the rings to seize and overheat, the motor doesn't seize but scores the bores/pistons and eventually the rings break up

 

Acca juice is maturing slowly

I saw Oompa yesterday and his car is coming along nicely, it's going to be a very capable track weapon when he's finished.
One thing we noticed was that he has a totally different gearbox cooler on the early GT4

Mine (normal?)


Bruce's cooler is a monster and makes the normal type look small




Anybody else got one of these?

 

Lexus ES300 brake conversion, TTE mirror visors

I take it nobody else has seen that air duct either?

TEMS now has eyelashes




Went to the the yards today - no Celi's, so I got bored and started looking at other cars in the Toyota range.
The other day I noticed that Oompas early JDM ST165 wears ST182 disks and calipers which I thought was odd - that is till I saw this...

Stock ST162/5 disk in the front (255mm), rear is 275mm and 28mm thick, calipers are monster twin pistons

On the right is a huge single piston Camry/Windom V6 caliper, I suspect the same as those on later ST185's?

Question is what car are these brakes & disks from?
Clue - NOT ST162/5, ST182/5, ST202/5, ST206, ST215, Windom, Camry, Supra, Vista, Curren

 

Good guess but no, SW20 has different pcd and disks are small. I believe the Turbo has very similar brakes though

These come from a Lexus ES300, The Camry & Windom V6's use the same disks and pads but for some reason the Lexus is fitted with twin piston calipers which fit onto the Camry/Windom brackets and visa versa.
The bad news is they won't bolt onto our hubs as the bolt pattern is bigger, you'd need to swap the hub as well.
So this is what happens when a bunch of these cars are lined up and I'm bored.

Interestingly the 5S-FE Camry's had the same hubs/disks/calipers as our ST162's, it's only the V6's that have the bigger disks/hubs

It's given me some ideas as these calipers/pads are big enough to cover 300mm disks as found on Supras, Altezzas etc



What's confusing is that the ST185 has 2 types of brakes too, early models have ST165 brakes?, while later model disks look like these.
I measured a spare set of ST185 hubs and these calipers wont fit them either - ?
Does anyone have pics/info on the later model ST185 brakes?

 

JASMA Exhaust systems - defenition

I learned something new today.... JASMA is not a brand!

JASMA - Japanese Automotive Sports Muffler Association
It's an emission standard all exhaust makers must abide with, so if your pipe has JASMA on it, it was made in JPN


Also you cannot own a car in JPN unless your buy a parking space for it, cars under 700cc are exempt from this law. Expect Japanese cars to get a LOT smaller in the future.

 

3S-GE Stainless steel JASMA headers

This week I took delivery of an interesting set of stainless headers wearing the Jasma label.
It looks weird as it came from an MR2 but has the 4 wire O2 sensor I've been looking for

Looks similar to the Tanaka headers but is a 4-2-1 instead of a 4-1


Header tubes are bigger and more equal than those on the Gen2 GE headers, rear pipe measures 2 3/4 inches across - plan is to collect as much stainless pipe, silencers etc and build a complete new stainless system with a replacable rear section for track outings.


My other coup is a complete set of near new ST185 slotted brakes with new hubs and new EBC "Red stuff" pads, pics later when the sun comes out.