clusco Posted March 28, 2005 Report Share Posted March 28, 2005 I hear alot about not allowing carbon deposits to build up on your engine. How does one go about burning off carbon (easiest and safest way)? Link to comment Share on other sites More sharing options...
cadillac_caddy_sts Posted March 28, 2005 Report Share Posted March 28, 2005 Take your car to a highway in the middle of no where and do WOT's (wide open throttles) and just put your foot to the floor when in first than wait for the car to shift gears, than slow down and do it again! Well I dont know about these guys but this is how i do it! Defending Northstar perf a qtr mile at a time!!!! Link to comment Share on other sites More sharing options...
Ranger Posted March 28, 2005 Report Share Posted March 28, 2005 Yup, just take her out and give her a good whoop'in. The idea is to plant your foot firmly on the floor and wind it up to redline and let it shift at WOT under load. Do it lit you don't see anymore carbon and soot in the rear view mirror. Link to comment Share on other sites More sharing options...
TDK Posted March 28, 2005 Report Share Posted March 28, 2005 I thought one important part was to have it in 2nd, so the engine braking generates high vac on the manifold and exercises the rings, etc from a different loading. The speed ranges noted were 20-70 or so (before it shifts due to high rpm). In any case, the only other carbon-burning method I recall was for carbon deposits on reactor nickel/iron-oxide catalyst deposits (add a teesny bit of oxygen with steam at about 1,400F - too much and poof)... Whoops ! that's for ammonia synthesis plants - sorry too much Chardonnay Add power to leave problems behind. Most braking is just - poor planning. Link to comment Share on other sites More sharing options...
Ranger Posted March 28, 2005 Report Share Posted March 28, 2005 As I recall Guru's explanation (someone correct me if I am wrong), the 2nd gear run to 60 or 70 and then engine brake and do it again was to cause ring flutter which will brake up and free badly carboned rings. Just doing it in drive would be normal prevenative maintanence. Same thing without ring flutter, which I also recall him once say, was not necessarily a good thing but won't hurt. I took that to mean it should not be a steady diet. Link to comment Share on other sites More sharing options...
cadillac_caddy_sts Posted March 28, 2005 Report Share Posted March 28, 2005 I thought one important part was to have it in 2nd, so the engine braking generates high vac on the manifold and exercises the rings, etc from a different loading. The speed ranges noted were 20-70 or so (before it shifts due to high rpm). In any case, the only other carbon-burning method I recall was for carbon deposits on reactor nickel/iron-oxide catalyst deposits (add a teesny bit of oxygen with steam at about 1,400F - too much and poof)... Whoops ! that's for ammonia synthesis plants - sorry too much Chardonnay Well I do that to! I drive with my foot on the floor from about 10-70 mph! Than I slow down to 10 and I do it again! Defending Northstar perf a qtr mile at a time!!!! Link to comment Share on other sites More sharing options...
clusco Posted March 28, 2005 Author Report Share Posted March 28, 2005 So should I put it in drive, 1st or 2nd gear? Link to comment Share on other sites More sharing options...
cadillac_caddy_sts Posted March 28, 2005 Report Share Posted March 28, 2005 Myslef I just use 2nd and drive. I never use first unless I want to do WOT's around town just to show off my load duel exaust around town! Defending Northstar perf a qtr mile at a time!!!! Link to comment Share on other sites More sharing options...
Ranger Posted March 28, 2005 Report Share Posted March 28, 2005 So should I put it in drive, 1st or 2nd gear? If you have the space to use 2nd to 60 or 70 and then let it back down to 40 or 50, then use 2nd. If you will be unable to let it back down then use drive and it will wind up and shift before you get to 55. I'm sure Guru will clarify. Link to comment Share on other sites More sharing options...
Regis Posted March 28, 2005 Report Share Posted March 28, 2005 So should I put it in drive, 1st or 2nd gear? If your nearest highway has a speed limit of 55 then just put it in 2nd and mash the peddle until you hit 55-60. Then let off the gas and let the engine brake your speed back down to 35-40 and then hit the gas again. Do this a few times (I usually do it 6-8 times) and you should be good to go. Guru mentioned that it's a good way to blow the carbon out and not risk getting a speeding ticket. I just realized that Larry posted pretty much the same thing before me. "Burns" rubber " I've never considered myself to be all that conservative, but it seems the more liberal some people get the more conservative I become. " Link to comment Share on other sites More sharing options...
adallak Posted March 28, 2005 Report Share Posted March 28, 2005 Is WOT good/necessary fr 4.9 motor? Any change in the WOT procedure for that particular motor or all the same? The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
Ranger Posted March 28, 2005 Report Share Posted March 28, 2005 I don't ever remember hearing any discussions about WOT for the 4.9. The Northstar has a "Squish area" in the chamber that has a very tight clearance and any carbon build up causes the piston to contact the carbon build up resulting in piston slap. I don't think the 4.9 has that problem. Link to comment Share on other sites More sharing options...
adallak Posted March 28, 2005 Report Share Posted March 28, 2005 I don't ever remember hearing any discussions about WOT for the 4.9. The Northstar has a "Squish area" in the chamber that has a very tight clearance and any carbon build up causes the piston to contact the carbon build up resulting in piston slap. I don't think the 4.9 has that problem. Thanks, Ranger, I told you 4.9 was better than Northstar! The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
Ranger Posted March 28, 2005 Report Share Posted March 28, 2005 They certainly are reliable, and not exactly slow either. Link to comment Share on other sites More sharing options...
cadillac_caddy_sts Posted March 28, 2005 Report Share Posted March 28, 2005 I don't ever remember hearing any discussions about WOT for the 4.9. The Northstar has a "Squish area" in the chamber that has a very tight clearance and any carbon build up causes the piston to contact the carbon build up resulting in piston slap. I don't think the 4.9 has that problem. What is a piston slap? Defending Northstar perf a qtr mile at a time!!!! Link to comment Share on other sites More sharing options...
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