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Is running rich bad for your engine?

Is running rich bad for your engine?

Old 10-27-2008, 09:35 AM
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Default Is running rich bad for your engine?

I have had great success on running my engines so there is plenty of blue smoke and plenty of power. I have always told myself as long as it has enough power, no need to make it leaner.

Sometimes it will come off at 190-200. But by the engine running cooler, it seems the internal parts won't expand as much therefore more engine wear and stress compared to someone running at 230-240.

Engine tuners getting 10+ gallons on their engines or anyone who has experience with this, please go in detail on the above.

Thanks!
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Old 10-27-2008, 09:50 AM
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I dont see where it would hurt, but i am by no means a professional engine tuner. I have thought about it too and the only thing i can come up with is the con rod big end could possibly wear faster. It has to work harder to push the piston up because of the extra fuel in the combustion chamber. But there is also more lubrication reaching the con rod from rich settings. Heat is the #1 cause of death in all types of engines, so the cooler you can keep it while still making the power you need the better off you are IMO.
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Old 10-27-2008, 09:50 AM
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My Go-Tech 3 port sport has 10+ and I run it between 250 - 300 degrees. Still has as much compression as it did at 3 gallons. I use it today for practice and as a back-up.

I've heard that running rich can be bad due to build up and what not.
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Old 10-27-2008, 09:51 AM
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i agree with you to a point. And in theory that is what you want, but i personally want the thing to snap. I want the car to move as fast as i feel it should in relation to the trigger. The richer you run the cooler the temps and the less damage/wear on the engine, plus the fuel is a lubricant, more fuel, more lube. But i do tune my motor to be crisp and rip. Also, at times, a little more power can get you outta trouble. JUST MY OPINION!
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Old 10-27-2008, 10:01 AM
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I know if you run them to way to rich you can really load up the crank case and bend a rod but that does not seem to be the case here. I have had motors last 3 gallons and some last 8. I think one of the key items to long motor life, besides the correct running temp, is how you treat it after the run. Roll your piston to the bottom after a run, soaking it down with after run oil when done for the day, cleaning your motor and checking the enternals on a regular basis, etc.
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Old 10-27-2008, 10:06 AM
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Ok, thanks for your responses. Keep em' coming.
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Old 10-27-2008, 10:20 AM
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Running rich (to a point) will most likely extend the life of your engine, less rpms, more lube is always good for wear, but I've found that glow plugs seem to die much faster.
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Old 07-22-2011, 02:36 PM
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Default running rich is bad

running rich will give u more power for sure but not all the fuel is burned thats why cars backfire especially tuned up rally cars to keep the turbo hot to keep the boost up but running rich will wipe more oil of the cylinder walls and obviously harm the combustion chamber if your going to run rich only make it run a lil rich and hone the cylinder walls and use slick 50 or oil that has maximum lube
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Old 07-22-2011, 02:55 PM
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running too cool, especially during break-in, is NOT good for your engine. These engines are in designed to run in the mid-200s (Fahrenheit), and tolerances are designed for that. You will have increased pinch, and thus increased load on your wristpin, conrod, and crank pin. When these start changing, your port timing also changes. This will drastically hamper the performance of your engine.

Also, although you'll have more lubrication, liquids dont compress. That means than you'll have more resistance at TDC, again causing more stress to the parts mentioned above.

When your engine is properly tuned, it runs better for a reason. 190-200 degrees is not sufficient. You should at least be hitting 230 degrees.
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Old 07-22-2011, 02:58 PM
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running rich is hard on the internals, but depending on engine 200 isn't real rich. But running at better suited temps is safer, better mileage, and throttle control.
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Old 07-22-2011, 03:50 PM
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Engines have more pinch when cold. The fact that preheating a new engine for start-up is proof positive of that. Up to a point, the cooler your engine runs, the tighter the piston to sleeve clearance. This is caused by the fact that the sleeve expands more than the piston does.

I preheat my engines before EVERY start-up until all the metal pinch is gone. Any time you start your engine that still has pinch you are wearing the piston more. I tune for smoke and performance and never look for a specific operating temp. Doesn't it stand to reason that an engine that is correctly tuned will run cooler at 60F ambient than at 90F? Tuning to a specific temp is a waste of fuel, time, and engines.

Every engine in every truck/buggy runs at a different temp.
Tune your engine to run crisp with good smoke...................and drive it.
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Old 07-22-2011, 06:54 PM
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I tune for sound and smoke. I want to see some smoke when gunning out of the turn, but mostly clear up on straits to slight smoke trail. You get a feel for it kinda. Must be doing something right as I am constantly getting 10 plus gallons out of my RBs. Think I am going to try werks next though. I like the older rbs better.
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Old 07-22-2011, 06:59 PM
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Originally Posted by mitsufan99 View Post
running rich will give u more power for sure but not all the fuel is burned thats why cars backfire especially tuned up rally cars to keep the turbo hot to keep the boost up but running rich will wipe more oil of the cylinder walls and obviously harm the combustion chamber if your going to run rich only make it run a lil rich and hone the cylinder walls and use slick 50 or oil that has maximum lube
WTF are you talking about??
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Old 07-22-2011, 07:25 PM
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Originally Posted by ScottyM View Post
WTF are you talking about??
+1
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Old 07-22-2011, 07:32 PM
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I read a few times to see if I missed something that would make me understand, about 4th time, I realised I didn't miss a thing.
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