New replacement/aftermarket valves ?!

[DamirGTI 327]

Gents ,

 

Any idea which aftermarket valve brand is best/worth buying quality wise ? 

 

- Osvalt

- TRW

- AE (Federal Mogul)

- BGA

- Freccia

 

.... haven't bought any for quite a while , thus unsure of the nowadays quality with regards to the aftermarket valves .

 

It's LPG converted 1.8 Nissan QG18DE , two exhaust valves are pretty badly pitted and one just started "burning" on the valve margin corner .

[SRDT 148]

LPG isn't good for valves and seats, you should check if QG18DEN valves or seats are special.

[DamirGTI 327]

Surprisingly , It's just these two exhaust valves on which the seats are severely damaged (and one of those "started" burning) , all the rest inlet/exhaust are fine and cleaned up easily/quickly with fine grade grinding paste .

 

These two , i tried to lap/resurface but the pitting is way too deep , and obviously the more i grind them the deeper they fall down the combustion chamber thus decided to give up on them .. especially when i spotted burning mark on one .

 

All the valve seats in the head are good , including the ones in which the two bad exhaust valves where in .

 

It has "valve saver kit" (Flashlube) installed , but was driven without the fluid in the tank for god knows how long ! ... unsure if that made them valves go bad or something might be wrong with the LPG injector on that cylinder No. 4 .. or could be something else (typically for "QG" Nissan engines was burning a lot of oil cause of worn/caked up oil control rings , i'm currently doing full engine rebuild) .

 

D

 

 

[petert 554]

Wow. My TB42E Nissan Patrol has done about 300000Km on LPG and I've never touched it. If the metallurgy of the seats, valves and guides is good, there isn't a problem.

[DamirGTI 327]

Y60 is an proper old school robust Japanese engine , this new Nissan-Renault QG's are kinda like sewing machine toys for baby girls !

 

Anyhow , still unsure if it's LPG which caused this (but kinda think it did..).. complete list of the previous owners of the subject vehicle is unknown , all i know the last/current owner is a type of a driver who goes by the "till the wheels tear us apart" maintenance .

 

Interestingly i've had PSA XU's also on LPG and never had single valve looking like the above ...

People/garages who does LPG conversions often say Japanese cars/engines tend to be tricky for LPG , on some they even refuse to do the LPG conversion cause of the fear of valve train problem ?!

 

D

[DamirGTI 327]

So .....

 

Anybody bought any of the aftermarket valves recent years ?!

 

If not in this day and age , i'd go with TRW as they used to be very good ... but nowadays , TRW valves seems to be of dubious metallurgy and inconsistent quality .

 

Anyhow , few phone calls and chit-chat with the machine shops , they recommend - "Intervalves" , apparently Swiss made and often OE supplier for various EU car brands .

Really can't wait for the OE Nissan parts due to the +/- 15days till they arrive , as there's none in stock in this rabbit hole country ..

 

 

What's the catch with the BGA brand , says "Made in UK" on the boxes ? are BGA parts really UK made ?

(used a fair few their timing chain kits , and "touch wood" , they're proven good no complains ..)

 

D