swisstonihasher

Just wonder if anyone has used one of these special decoke kits, spray can to remove gunk from inside engine cylinders? Anyone recommend a brand that they;ve used before without issue?

johned

Personally i would never touch anything like that.

alcazar

iTrader: (2)

Nor me. It MIGHT loosen a bit of crud which then gets caught under the exhaust valve, and helps it to burn out

JohnD

iTrader: (5)

They're usually pretty safe and can be effective in some cases. Used to use a bottle of Redex in the old days - poured into the carburettor and clouds of smoke!
You may feel a difference or you may not, but used as directed, should do no harm. The best known is probably http://www.ecotekplc.com/PowerBoost.htm I've used this with no ill effects but admit I didn't feel any noticable improvement, that's not to say it didn't do a bit of cleaning.

JohnD

swisstonihasher

Thanks for the comments guys, I did have concerns with chunks of coke going out the exit ports...also read about BK44 something...that's meant to be good.

JohnD

iTrader: (5)

If you manage an actual chunk of coke (albeit small) coming loose, I would suggest your engine needed a treatment a long time ago! Modern petrols and oils produce very little carbon as well as engines running much leaner than before and physical de-coking is virtually unheard of. I remember back in the '60's and '70's scraping carbon off pistons and valves and lapping the valves into their seats after just 20-30k miles.

JohnD

Spencerdale89

if its aint broken..... dont fix it!!

swisstonihasher

Well my cars only done about 4-5k but most of it has been bloody rich on idle. Various mappers setup the car the same so it would idle semi smooth (lary cams) but now I've got the software myself and I've made improvements...I've seen the bores though, coked up on pistons...hence asking.

JohnD

iTrader: (5)

From what you say I assume you are running open loop on and off boost so the mapper has adjusted AFR for off boost running to accomodate the timing of the cams? Do you know what the AFR is at idle? Thank heavens for VVT

JohnD

swisstonihasher

Not yet as I'm still waiting for my ecu to come back with wideband functions added and then i can install my innovate....doesn't really make much difference as I'd already changed my idle area of mapping to reduce fueling (by decent numbers) and get the ecu/narrrow band lamdba to read rich/lean rich/lean more often, previously it was always in the 2nd to top red on rich at idle. Another chap that's helping me with mapping said my idle fuel figures were double his...

Car def is a bit sooty around bores...so fancy giving it a clean up...looking at seafoam now.