1hz turbo camshaft

[roscoFJ73]

well, Rosco... i crossed the part numbers between the 1HZ, the HDT and the 1HZT and the pistons for the 1HZT is a unique part number...

It was already revealed it was in the EPC in another thread,tell me something new. Notice it lists a 1HZT but no 1HD T.
A search on Google reveals there are dozens of HDB50 Coasters so why isnt the 1HD T powered coaster not showing up in the epc?


Answer Because someone has mistakenly put a 1HZ T into the EPC.

And another question. Why doesnt the 1HZT Coaster have its own alpha numerical designation insted of using the same one as a 1HZ powered coaster?
Every other Toyota on the planet that has a turbo displays it in its alpha numerical code.

Toyota Australia are calling it BS too by the way

 

[crushers]

but rosco, if it was in fact a HDT then it would have the same piston number as the HDT for the same year...and it doesn't. there are 3 basic different piston part numbers, the 1HZ, the HDT and this new missing link the HZ-T.

why would it have it's own part number if it was actually a HDT

 

[roscoFJ73]

but rosco, if it was in fact a HDT then it would have the same piston number as the HDT for the same year...and it doesn't. there are 3 basic different piston part numbers, the 1HZ, the HDT and this new missing link the HZ-T.

why would it have it's own part number if it was actually a HDT

Well why doesnt it show up in any Google searches. I just looked at a list of several hundred used Coasters and they were all HZB** N/A or HDB** with 1HD T with engine bay pics.
None of them were 1HZ T
In fact you cannot ,unless someone can show me different,find any reference to a factory built 1HZ T anywhere(except here of course)

I did find a few HB 31/32 ,12HT powered coasters

 

[crushers]

so Rosco, i know you are not easily convinced, can you explain WHY there is 3 different basic piston numbers then?
i can not so that leads me to believe there might actually be this mysterious engine somewhere...

 

[hdj105]

so Rosco, i know you are not easily convinced, can you explain WHY there is 3 different basic piston numbers then?
i can not so that leads me to believe there might actually be this mysterious engine somewhere...

It's a major conspiracy theory, which originates from the Toyota parts catalogue people, aimed at those 1HZ owners who have never experienced the power and economy of a direct injected version 1HD...

 

[roscoFJ73]

so Rosco, i know you are not easily convinced, can you explain WHY there is 3 different basic piston numbers then?
i can not so that leads me to believe there might actually be this mysterious engine somewhere...

I dont have an EPC but I believe it contains superceded part numbers. Its possible pistons and other parts have been upgraded so the one part can have 2 or more numbers.
Or its an error that was never wiped off the program . Thats not uncommon in many computer games and programs

Toyota already had a stable full of turbo ready engines so why would they make another,especially as the 1HD T is turbo ready?
Its hard to fathom why they would make 2 turbo engines side by side of the same block and cubic capacity and fit them into the same vehicle.
I can see no valid reason why a 1HZ T would be any cheaper to build than a 1HD T.

Im not easily convinced because I see no real proof the engine exists,except for an obscure reference in an EPC.

Try a dealer through your contacts in Japan and see if the pistons are actually available and are the same specs as stated in the EPC.

I tried,and Toyota Australia dont sell them.They have the part number but its blank.

 

[crushers]

good point Rosco,
i will give that a try righ tnow...

if it is a blank then you could very well be correct...

 

[crushers]

so i checked with Toytoa Japan and those are valid part numbers...for export only...maybe why they only are rumored to be in Oz???

 

[Dougal]

Or its an error that was never wiped off the program . Thats not uncommon in many computer games and programs

Easily possible. But it doesn't explain the sticker.

 

[roscoFJ73]

Easily possible. But it doesn't explain the sticker.

Well it doesnt look like it was taken from a photograph of the real thing


There is already a 1HZ sticker and a 1HD T sticker.
It wouldnt take much imagination for someone who believed he/she was on the right track by joining the stickers together.


And if Cheekboy can get some of these pistons,why do they have to come from England where any 1HZ is rare and Coasters are not sold?


British owners can barely get anything off their dealers who largely know little or nothing about 1HZ,HDT 1KZ T diesel engine let alone some mythical 1HZ T piston.

 

[denis]

The engine FSM (at least mine) also has references to the 1HZ-T IIRC.
Unfortunately its on a long-term lease right now

 

[cheeckyboy31]

the 1hz-t pistons i am buying do not come from england but from engine australia, tax return is done so i should have them in my hands in the next month, i will post pix and part numbers from the actual units.

got my turbo cam from deane tighe last week, took about 0.25mm off the base circle to get the optimal grind for turbo application (better than 1hd-t). was a bit hurried at the time. after i get the shimming done for the head i will take it back to run up a lobe chart and get a reference number so others can obtain one.

still trying to get a better price on the total seal rings, about $250 for six 2nd top rings atm.

 

[Dougal]

got my turbo cam from deane tighe last week, took about 0.25mm off the base circle to get the optimal grind for turbo application (better than 1hd-t). was a bit hurried at the time. after i get the shimming done for the head i will take it back to run up a lobe chart and get a reference number so others can obtain one.

Did you measure up the original cam before the work?
I'm really curious to see what the main differences are.

 

[cheeckyboy31]

i have the cam chart they made on the cam doctor before they ground it. from discussion he said it had a wider lobe centre, less inlet lift, earlier exhaust opening to pulse the turbo better. desired result was a broader power spread, less peak power but more under the curve, quicker spool up, more overun past peak power. the grind he has offered is supposed to give this. he said to try it with standard timing first and then maybe advance it 4 deg with an offset key. i will get it on the cam doctor to produce a chart before it goes into service. a dyno pull will be in order when i get it ready.

the turbo has a very small (1 15/16") outlet, i want to open this out to 2 1/4"but i will run up the head/cam first so i can evaluate what effect that will have on its own.

 

[cheeckyboy31]

here is the cam charts, before and after.. lobe centre is actually closer, overlap is reduced as is lift. exhaust starts earlier.

 

[Buds]

1HZ cam

HI cheekyboy

just wandering how that engine rebuild is going?
Who and where did you get that cam from, and what did it cost for the regrind?

 

[mark2583]

Well I've got a head being forged up bigger valves every thing ported out bigger water gunel through front of the heat camed also forged blue print an balanced 40tho over sizes forged pistons forged con rods blue print an balanced as well an also gone with forged crank blue print an balanced going to get 12mm pump just trying to figure out who makes best pump out an thinking of upgrading turbo as well was running 14psi originally before I stripped it down