mellonman Posted December 14, 2010 Share Posted December 14, 2010 Hi all i have been looking around into the best way to decoke your enigne i am using redex and injector cleaner at the moment. but i have heard some funny things just wonder if anyone has any knowledge on this with the supra or what the best adative is? brake fluid straight down on the piston ? water in the inlet vac pipe ? Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted December 14, 2010 Share Posted December 14, 2010 Modern fuel injected engines dont need decoking mate, thats a term from the 50s when fuel was shit and cars burnt as much oil as fuel, and 2 stroke bike engines. Best advice, dont bother Quote Link to comment Share on other sites More sharing options...
dude Posted December 14, 2010 Share Posted December 14, 2010 Modern fuel injected engines dont need decoking mate, thats a term from the 50s when fuel was shit and cars burnt as much oil as fuel, and 2 stroke bike engines. Best advice, dont bother Unless of course the vsos have been leaking for a year or 2 and the turbos have been leaking, i had to thow a set of valves away the other day they were so bad and the exhaust ports in the head were a lot smaller than when clean and remember thats carbon, really nice when it goes thru a turbo spinning at 100,000 rpm. Im sure advice is greatfully recieved but only when it is indeed correct, any carbon/coke on a piston etc will cause a hotspot/det etc so decoking or more to the point a good clean is VERY necessary. Quote Link to comment Share on other sites More sharing options...
mellonman Posted December 14, 2010 Author Share Posted December 14, 2010 i have been looking around and even prieus engines that have covered 30k have needed it! Quote Link to comment Share on other sites More sharing options...
mellonman Posted December 14, 2010 Author Share Posted December 14, 2010 also my turbos did let go and where leaking so a good finger pointing at that, Quote Link to comment Share on other sites More sharing options...
Nic Posted December 14, 2010 Share Posted December 14, 2010 (edited) best way to decoke your enigne i am using redex and injector cleaner at the moment. The best way would be to pull the head, strip it, clean and get it rebuilt. I've always been wary of using any fuel additive 'cleaners', I don't know enough about them but know that some can reduce the life of the oxygen sensor. Any experts on here? Edited December 14, 2010 by Nic (see edit history) Quote Link to comment Share on other sites More sharing options...
dude Posted December 14, 2010 Share Posted December 14, 2010 Heres some pics of a modern engines head and valves,being modern it of course does not need decoking!!!!! This is after its been in the hot tank for an hour:blink: Quote Link to comment Share on other sites More sharing options...
Terminator Posted December 14, 2010 Share Posted December 14, 2010 That reminds me of what you used to see inside old Morris Eight engines. Quote Link to comment Share on other sites More sharing options...
mellonman Posted December 14, 2010 Author Share Posted December 14, 2010 Heres some pics of a modern engines head and valves,being modern it of course does not need decoking!!!!! This is after its been in the hot tank for an hour:blink: holy s#!t i dont think no petrol treatment will help that, i do hope mine is not as far gone as that Quote Link to comment Share on other sites More sharing options...
mellonman Posted December 14, 2010 Author Share Posted December 14, 2010 would water meth injection clean that away with out stripping the head ? cos that would be alot cheaper way and have added benafits of cooling Quote Link to comment Share on other sites More sharing options...
Ian C Posted December 17, 2010 Share Posted December 17, 2010 I'm not sure what you're thinking (or possibly smoking) but a WI setup with Meth injection install would cost near enough the same as getting the engine properly dismantled and cleaned. And a proper clean would fix the actual problem, whereas running meth through in an attempt to clean it it is wishing for unicorns. On top of that, if you think it through, where is all that carbon crap going? Through your engine/pistons/valve stems and then out through your fast spinning turbos. Please focus on getting things sorted out and a proper job being done It's going to cost money - that's what cars do. Quote Link to comment Share on other sites More sharing options...
pezzler Posted December 17, 2010 Share Posted December 17, 2010 a WI setup with Meth injection install would cost near enough the same as getting the engine properly dismantled and cleaned. What sort of labour time would you look at for this kind of process, obviously allowances needed for properly gummed up engines, but a ball park figure? Probably a good question for Dude, i'm sure he's done a few Quote Link to comment Share on other sites More sharing options...
mellonman Posted December 18, 2010 Author Share Posted December 18, 2010 I'm not sure what you're thinking (or possibly smoking) but a WI setup with Meth injection install would cost near enough the same as getting the engine properly dismantled and cleaned. And a proper clean would fix the actual problem, whereas running meth through in an attempt to clean it it is wishing for unicorns. On top of that, if you think it through, where is all that carbon crap going? Through your engine/pistons/valve stems and then out through your fast spinning turbos. Please focus on getting things sorted out and a proper job being done It's going to cost money - that's what cars do. yes this is a very true point ( i must lay off the herb lol ) its just the car has cost me so much its starting to get me down with more and more problems happening [sAD][/sAD] Quote Link to comment Share on other sites More sharing options...
Nic Posted December 18, 2010 Share Posted December 18, 2010 yes this is a very true point ( i must lay off the herb lol ) its just the car has cost me so much its starting to get me down with more and more problems happening [sAD][/sAD] Does it definitely need doing? Have you checked with a bore scope to see if there is carbon build up? Quote Link to comment Share on other sites More sharing options...
jagman Posted December 18, 2010 Share Posted December 18, 2010 Probably the majority of cars need doing by now , and head off is the only real way of ensuring that its all clean Lots of cars on the 7 8 or 9th owner by now , the last 3 just drove the car and sold it when the tyres wore out!! oil sodden i/c , valve stem seals , short trips to buy the fags , and the knackered sensors all promote carbon build . six months studying shiny new single turbos ,and agonising over what supporting components to fit only to pass carbon flakes through the turbine at 700mph is probably not the best idea ,coupled with increasing boost and cylinder head temps into a carboned piston or exhaust valve probably not the second best idea either Quote Link to comment Share on other sites More sharing options...
mellonman Posted December 19, 2010 Author Share Posted December 19, 2010 Does it definitely need doing? Have you checked with a bore scope to see if there is carbon build up? bore scope is next just to see if this is the problems with the hot spots when mapping and getting det, but still running well rich as map not finished and the weather has turnt bad so cant get the car there till weather gets better but then it will be christmas hopefully santa will leave a new engine in my stocking lol:d Quote Link to comment Share on other sites More sharing options...
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