after the 1 half tank on techron,u no longer feel the car smoother is it?.

Ok i'm listening to both and i hope you guys can help me - im driving a 1.8 sentra (15 years old) - how do i improve my engine performance ? i do feel like im driving a 1.3 nowadays...very sluggish. Any recommendations are welcomed.

3M - rm40 per bottle
not yet finish the first tank so i dont have the answer yet...

if engine was never maintained properly, nothing can be done, wear and tear has set in and cannot be reversed magically

yes of course get it wrong and there'll be hell. But competent mechanic can do this correctly.

But as others had said, GDI engines are very prone to carbon buildup due to the design of the engine.

If you're worried about the walnut getting into the cylinder, the valves are either close, or open. No in between half close/open so unless the mechanic is dumb and forgetful as f, chances of getting this wrong is pretty low to be honest.

Also if few bits of are accidentally missed out during the cleaning, it won't really do much harm to the engine (from what i've seen).

from where i read somewhere in bimmer forums, BMW in USA is apparently offering this service for their customers with GDI engines.


Omg why so salty you had tried this with any of your car and got screwed over is it? if yes, please do share the details so that we can avoid the workshop.

This post has been edited by axtray: Mar 20 2019, 04:21 PM

For fuel additives, either Caltex Techron or Redline SI-1.

The main reason why use walnut shells as medium :
1) a gentle enough medium that can abrade the carbon away without scouring the metallic components
2) it is cheap and easy to procure, facial parlours use this as exfoliant
3) even if some shell flakes flew into the combustion chamber, it is easily turns to ashes when the combustion cycle starts.

I'm not so stupid to try this thing that bring no benefit and here all the bangla buggers doing the work

don't misunderstand , walnut cleaning has been around as surface treatment as long as the invention of the car, but it always is done with parts removed and then put into giant washer to remove any residue.

if you want to try please go ahead man , it's not. my engine not my money , personally I would never ever use these guys even if gdi as long it has no running problem

because the easiest person to fool is yourself

forum always Damn easy to say , you find the right mechanic la, do this do that , but never anyone can give real good one

the thing is, it is called preventive maintenance. Why would you want to wait until the bigger symtoms such as misfirings, jerking etc to finally go and fix it? In the long run, it may be potentially more expensive repair.

if it's not broken don't jerk around with it

perfect running engine can be ruined with one simple mistake

preventive is using good oil, change good filters in time .

not introduce risky damaging procedures for zero gain

when it work no benefit , when it goes wrong totally destroyed.

The no benefit part is where you are not correct. 😂 Let me ask you this: if a GDi engine already has around 2cm build up of carbon on top if the valves, is it good to be able to clean it completely?

again apply.the rule

is the engine suffering check engine lights?
is the engine struggling to run properly ?

if both of these are a no , don't friggin touch it . Engines are so complex on monitoring themselves they will tell you when stuff is broken

again the question of what you want to risk vs benefit.

so okay you removed the 2cm , but engine feels the same, runs fine as before so what did it do ? nothing

but make that mistake and you are happy to say , yeah I buggered one cylinder but my other 3 valves are clean eh, eh ,eh, I'm smart like a fox

And consider this other fact.

When industry uses media blasting to clean machinery, surface prep for painting , etc. The blasting shed is always located far away from the work area.

Why ? Because that shit gets into every goddamn hole and crevice and tiniest of places. Sandblasters have the shittiest job next to sewer divers, they get media up their butt cracks.

Here if we have this so called 'expert' happily dusting the entire engine with super abrasive material , all the rest of your pulleys, pumps , fans are going to get chewed up from being exposed to abrasive dust.

And high precision machinery, gas turbines, classic car restorers, never use abrasive media, they use ice blasting/ co2 blasting / dry ice where the media is dry ice, it just evaporates harmlessly with no residue.

Walnut blasting is banned by US Army because of one fatal helicopter crash caused by walnut shells found in the oil lines that blocked oil to the main bearings causing fatal failure.

And all the above is assuming really walnut is used instead of regular old sand which is 100x cheaper than actual walnuts.

Well if you leave it then it will grow bigger right? So you just want to repair when it's already got bigger problems instead of doing preventive maintainance so not to get worse? It's like if you have a small tumor and you know about it but you just leave it to grow bigger coz it hasn't make you feel sick, is that it? If that's the case then ok lor! ☺️

if you're building 2cm thick on valves, the engine is buggered anyways and it's a probably a crap beater car that no one really cars about anymore.

and yes if there's no light i'll leave it. until it's broken then fix it because then it can't be buggered anymore worse than it already is.

do you do chemo just in case, since it kills cancer, why not do it like every 5 years once just to be safe?

same concept

Not exactly the same. There's alot of difference in treating early detected cancer as compared to trying to treat it when it's already at stage 4 etc.

Same goes with the car. If you open the intake manifold and can see the carbon buildup is already there, why not do something about it? No one is stupid enough to do it and waste $$ if it's still clean.

If you have the spare cash to totally overhaul it, by all means do it. Walnut blasting is just the cheaper alternative that works. Your example on the blasting made it sound like it is totally abrasive when the walnut shells are pretty soft. If some of the grains do somehow managed to get into the cylinder, the combustion will just burn them out. Big difference to sand blasting. Also, If the valves are closed and the walnut still somehow managed to find its way in, then something is really wrong with the engine already.

I still find it weird on why you are so edgy about this.

To those who don't know the process,
"This blasting tool is using pressurised air (usually 6-8 bar) to inject fine walnut shell granules into the intake tract. These granules hit the carbonising at high speed and thus remove it entirely, while at the same time this material is soft enough not to damage the metal of the intake tract and the valves. That is also the reason why no other material should be used for this method."

This post has been edited by axtray: Mar 21 2019, 12:05 AM

Seems like you never owned or saw carbon build up in a traditional GDi engine in front of your own eyes. To answer your question, no the engine is still not buggered and no it's not s crap beater car either. 😁

No, not same concept. You do chemo because you already feel sick, which is exactly like you imply! Who do chemo without already feeling pain first from the cancer?? 😂 If still small tumor then cut it out la before it gets worse until you need chemo.

Anyway nevermind, no point prolonging the debate. Obviously you think that method is difficult and risky while I think it's not so complicated as you think. I personally haven't done it too but I've done similar method just using more traditional manual tools because back then haven't know anyone yet that does this walnut blast method. In the future when comes time I would do that method, easier and faster.

I'm not sure how you get the idea that inside the cylinder is like a wood stove or some magical field keeping walnut shells floating about until combustion

mate, the cylinder is an oily place inside , either from engine oil or the petrol , whatever got in is going to stick like.glue to the oily surfaces especially the finest ones , so now you have this lovely coated walls with fine abrasives just waiting for the piston come and drag them along the walls up and down over and over.

doesn't that sound a lot like honing cylinder walls ?

exactly the symptom

' I HEARD is soft '

' I have haven't done it before too '

before you all so support it , why not present the risks involve and why should someone not do it and understand what the proper way of doing it entails

not just plainly support it without really having tested it themselves before

so far only one post who said it did help but it was already. last resort to a bad running car , what else could.be worse than to try .

I don't care what marketing wank these so called experts provide , either you remove the head, use traditional solvent nd elbow grease or use dry ice , co2 blasting method to clean , or like every other industry standard the part is blasted away from work area , put into parts washer then reinstalled

blowing abrasives all over your engine is the right way to break everything which is not broken

again is yr money, your engine , if you feel overwhelming need to support them , go ahead. I just want those who want to know more to just stop and think ' oh yeah hor, really need or not'.

This post has been edited by rcracer: Mar 21 2019, 09:09 AM

As I said I had done it in very similar method whereby we need to alternately open/close the valves accordingly before cleaning but just using more traditional manual tools so I know how it's done, not just by guessing or hear say! It's not rocket science actually but you just seem to think otherwise. ☺️

traditional cleaning is absolutely fine aiyohhhh, solvent based cleaning even if valve open is nothing, everything is liquefied and carbon is nothing the engine hasn't seen already .

is the use of abrasives in the completely wrong and dangerous way

I know I not ang moh so I cannot be trusted , just go YouTube and see yourself, every single video will mention at least once , if you don't prevent the walnut from entering the engine , it will kill the motor , same message every video .