Camshafts oil tolerance

[Wolf_Tm250]

Hello all,

how much camshafts' oil tolerance do you use to have in your modded engines?

TIA...

[RedMist]

What the goat flucker is oil tolerance? Are you talking about rocker or bucket clearances? if so what engine?

[Wolf_Tm250]

Buah haah ha ha ha!!
My car is in signature
So engine is a 3sgte 3rd gen... no rocker then...

I intended camshafts to head supports oil tolerance...

Bye!

[Akane]

Please elighten us, what's oil tolerance?

[Wolf_Tm250]

Ehm...

tolerance between camshaft and head's supports...
where the camshaft turns on the head...

[fivebob]

Please elighten us, what's oil tolerance?

The clearance for the oil in the camshaft bearings.
In this case .0025-.0062mm (0.001"-0.0025")

[Wolf_Tm250]

Hi fivebob!
I put off my cams after 1000 miles of job to adjust the valves clearance, and i found them to be quite... awful...
Not ruined... but they have darker shadows where they turns in the supports...
So i supposed too little oil clearance...

[fivebob]

Hi fivebob!
I put off my cams after 1000 miles of job to adjust the valves clearance, and i found them to be quite... awful...
Not ruined... but they have darker shadows where they turns in the supports...
So i supposed too little oil clearance...

Got a photo of them?

Doesn't sound like to little clearance, that should cause the bearing to "pick up" and you'd have a ruined bearing. I suppose if it was just slightly to tight it could cause the oil to overheat, carbonise and leave a mark, but without seeing them it's impossible to say if there's actually anything wrong.

[Wolf_Tm250]

Got a photo of them?

Doesn't sound like to little clearance, that should cause the bearing to "pick up" and you'd have a ruined bearing. I suppose if it was just slightly to tight it could cause the oil to overheat, carbonise and leave a mark, but without seeing them it's impossible to say if there's actually anything wrong.

Pics? Not yet... here now is night, and with the light it makes so much reflection you'd not understand...

Imagine a new camshaft...with its shiny pins...
now, after 1000 miles, pins have some darker zones, yet shiny, but darker.

the pins are not deeply digged as if some dirt passed with oil...
at the most they seem like they were nearly to seize !

Poor oil pressure ?

It made only a track session... only 6 laps because I cracked a weld in the ext wg feed pipe.
In those 6 laps oil reached 120 deg C., not more, but oil pressure wasn't so high... 1 bar at idle AND 2.5 bar at 4000 rpm.

That's why I stopped it, put off the stock oil pump, and bought the $$$ WRC-TTE oil pump... ( even because my oil squirters are TTE - open at 3.7 bar ).

In the meanwhile I checked the valves' clearance and found the cams to be in this way...

[Wolf_Tm250]

Hey mate,

we found an error in Toyota manual, call them !!!

journal oil clearance 0.001"-0.0025" = 0.025mm-0.062mm

[fivebob]

Hey mate,

we found an error in Toyota manual, call them !!!

journal oil clearance 0.001"-0.0025" = 0.025mm-0.062mm

Indeed it is wrong, strange that the imperial measurement is correct, even though it's made in a country that uses the metric system.

At 0.0025mm clearance it wouldn't last very long before destroying the bearings

[Wolf_Tm250]

Hey mate,

we found an error in Toyota manual, call them !!!

journal oil clearance 0.001"-0.0025" = 0.025mm-0.062mm

Indeed it is wrong, strange that the imperial measurement is correct, even though it's made in a country that uses the metric system.

At 0.0025mm clearance it wouldn't last very long before destroying the bearings

Agree mate !

Let me make a little OT...
I mounted a 2nd egt sensor and the Motec AmpliTCK...
please give me a little little advice on a little fuel compensation map for too high egts

[Akane]

Oh i see, but I didn't know there are bearings in the camshaft journal too, I thought it goes straight to the journal.

[fivebob]

Oh i see, but I didn't know there are bearings in the camshaft journal too, I thought it goes straight to the journal.

The journal is the bearing. A bearing doesn't need to be a seperate item, it's simply the surface on which the shaft runs.

[Wolf_Tm250]

In fact there are not cams' bearings in 3sgte, btw there is an oil clearance between the cam and its journal...

[fivebob]

Let me make a little OT...
I mounted a 2nd egt sensor and the Motec AmpliTCK...
please give me a little little advice on a little fuel compensation map for too high egts

Don't know how much you'd need to add, EGT's are depenent on where the sensor is placed so it's almost impossible to recommend an amount of fuel to add.

Anyway I'd add water, not fuel

[Wolf_Tm250]

Interesting...

The egt sensor is just before turbine flange, where the 4 runners end in 1...
Thank you fivebob!
Bye...