unusual white smoke

[shishani_racing]

dear all
i have the white smoke problem and i did read many of your posts about the same problem .
and this is what happining to my car :
when the rev is 4k or more ( at the 5th gear) and i remove my foot from the pedal when the rev reaches between 3k and 2k , when put my foot at pedal again i see alot of white smoke .
i did compression test for the engine and all did 8.5
i did change 6 turbos
i did change the pcv
what could be the problem ?

 

[dac69er]

if your compression is 8.5 bar then that's about 125 psi. sounds like you have a worn engine.

as they are equal I would say you just need a set of new rings and hone and you should be fine.

 

[shishani_racing]

if your compression is 8.5 bar then that's about 125 psi. sounds like you have a worn engine.

as they are equal I would say you just need a set of new rings and hone and you should be fine.

but i know the standard compression is 8.5 , is that right /?

 

[AdamB]

Standard compression is 11.7 bar/170 psi roughly.

Did you do the test with the throttle wide open?

 

[shishani_racing]

Standard compression is 11.7 bar/170 psi roughly.

Did you do the test with the throttle wide open?

11.7 ????? its 4efte and like i said i think the standard is 8.5

 

[AdamB]

Yes that's right, its around 170psi, which is 11.7 bar.

 

[dac69er]

Yes that's right, its around 170psi, which is 11.7 bar.

your generally ok anywhere down to about 150psi as long as they are all pretty equal. past that your looking at stripping the engine down as there is excessive wear or damage.

with your description of your problem and the compression reading I would say its rebuild engine time.

 

[AdamB]

Yep I agree.
I wonder how much Low comp pistons change the pressure reading? If at all.

 

[shishani_racing]

Yes that's right, its around 170psi, which is 11.7 bar.

4E-FTE[edit source]
The first generation 4E-FE was the basis of the 4E-FTE in 1989, which was a turbocharged engine producing 133 hp (99 kW) at 6,400 rpm with 116 lb·ft (157 N·m) of torque at 4,800 rpm. The 4E-FTE was the most powerful of the E series engines ever produced. It was produced exclusively for the Toyota Starlet GT Turbo (Japan Only) and its replacement, the Toyota Glanza V (Japan only). However the 4E-FTE was a very popular conversion engine by enthusiasts for many small Toyota cars such as the Corolla, Tercel, Paseo and Sera which it fitted into with standard Toyota parts. The 4E-FTE differed internally from the 4E-FE only by its stronger connecting rods, and low compression pistons (reduced compression to 8.5:1) the cylinder head and valve train was identical to the 4E-FE the crankshaft was also stronger than the 4E-FE, you can tell which crank you have because the turbo will have 4ET stamped onto it, instead of 4E. It also featured a harmonic damper instead of a normal crankshaft pulley. The turbocharger fitted to the 4E-FTE was Toyota's own CT9 model, which featured an internal waste gate and had 2 modes: low (0.4 bar/40 kPa) and high (0.65 bar/65 kPa) boost. The low boost mode was electronically controlled by a solenoid valve and the ECU and the high boost was controlled by an actuator connected to the turbocharger. The 4E-FTE also had a top mounted, air cooled intercooler. The 4E-FTE was mated to the Toyota C52 transmission (for the EP82 Starlet GT) and the C56 transmission (for the EP91 Glanza V).
Specs:
74 mm Bore
77.4 mm Stroke
8.5:1 Compression Ratio

http://en.wikipedia.org/wiki/Toyota_E_engine

 

[shishani_racing]

Yes that's right, its around 170psi, which is 11.7 bar.

http://www.tercelreference.com/tercel_info/engine_info/engine_info.html

 

[dac69er]

you cannot calculate compression via the compression ration. you can estimate the range it should be in. read this:

http://en.wikipedia.org/wiki/Compression_ratio

trust me, a standard healthy 4efte will give about 170psi on a compression test. anything down to about 150 psi will be fine. anything under that means you have wear or damage.

obviously a car built to have lower compression will be different, but your figures seem a bit too low for the car to run well.

 

[AdamB]

The compression ratio and compression pressure is two different things.

 

[shishani_racing]

The compression ratio and compression pressure is two different things.

so maybe the test i did was compression pressure test
and this is the way i did ( remove one spark plug , put pressure gauge , crank the engine ) and all pistons give me the same reading 8.5 +- 0.1

 

[dac69er]

you need to remove all spark plugs, and make sure the throttle is fully open while cranking

 

[Skalabala]

Compression sounds ok to me with the way he did it.
What is your engine spec? Is everything 100% factory standard? Mileage? Has the engine been opened before? What turbos did you fit? And why 6 times?
Worn pistons will smoke all the time. Sounds like turbo/valve seals.

 

[shishani_racing]

Compression sounds ok to me with the way he did it.
What is your engine spec? Is everything 100% factory standard? Mileage? Has the engine been opened before? What turbos did you fit? And why 6 times?
Worn pistons will smoke all the time. Sounds like turbo/valve seals.

you have good start ..... i know if i have worn engine it will smoke all the time and the engine dont
the turbo i changed like i said 6 times and with the all 6 turbos the same problem at same rev exists .
im running standard engine , standard ecu , running 0.8 bar , ct9 to ct12 hybrid turbo , hks actuator , custom made exhaust mani with screamer down pipe , hks spark plugs

 

[wildchild]

good valve seals? else could be worn out valve guides.

 

[shishani_racing]

good valve seals? else could be worn out valve guides.

thanks ....
how can i know if the problem from the valve seal or valve guides ?

 

[Skalabala]

thanks ....
how can i know if the problem from the valve seal or valve guides ?

Remove the exhaust manifold from the head and have a look if the valve stems/heads are wet or "gunked" with oil.
Its best to do a light engine overhaul. You can take a chance to replace the seals but they can leak within a short time again.
If you remove the head to do the guides then you might as well overhaul. Its a small engine so the rebuild is quick
What were the condition of the turbochargers? Were they properly rebuilt and balanced?

 

[wildchild]

thanks ....
how can i know if the problem from the valve seal or valve guides ?

you have to take out the cylinder head to inspect the valve guides. same for the seals as you have to remove the camshaft and valve springs to get to the seals.