With the recent push to convert buses and trucks to natural gas I wanted to know what the major differences were between nat gas and gasoline powered engines. Is it a matter of horsepower or more of a safety issue?
I assume that your understand the basics of a RC Nitro Engine and how it works, if not please see my other articles which you can find on my website, see the resource box for details.
The Idle Screw
I always start with the idle screw, I adjust it so that the car will idle high when I’m first dialing in the engine. Once I get the engine up to temperature and with a tube that can keep it running without stalling I slowly adjust the idle down to the point where it’s about to stall, then I turn it back about 1/4 to 1/2 turn depending on the temperature. If your car stalls often it can be worth while increasing the idle to prevent this, it’s only a temporary fix while you sort out the other tuning issue, but it helps keep frustration levels down.
Low Speed Needle.
One of the great debates is which needle to adjust first, if your carburetor only has one needle adjustment screw then it’s not a problem, but if like most glow engines you have two you need to decide which to tune first. I always start with the low speed needle, this is because when you adjust the low speed needle you change the high speed needle. Once the low speed needle is dialed in you shouldn’t have to adjust it again. Make sure you keep it slightly on the rich side, when you RC Car idles the combustion chamber should start to fill up with fuel, this helps keep it cool. After a while the engine will stall, by measuring this you can tell if it should be richer or leaner. A good time is about 30 – 60 seconds before it stalls. The RC Car should pull off quickly from a standing start and should not bog down or flame out when you apply full throttle.
High Speed Needle.
Once you have your low speed adjustment needle dialed in it’s time to start getting the power out of the RC engine. This is done with the high speed needle, which adjusts the air to fuel mixture of the engine while it as high RPM (about 40% and up). Keep an eye on the trail of smoke as this is your first clue about the tune. You want to have a lot of smoke coming out of the engine at all RPM, if at some point there is little or no smoke then you are running too lean.
Hints, Tips and Tricks
What Is Repowering?
Repowering a small engine refers to installing a newer rebuilt engine into an existing vehicle in order to improve its performance and save on buying a brand new vehicle or motor. By repowering, a landscapers or golf course maintenance crew gets more than just swapping out an old engine for the same rebuilt model engine. Rather, a repower kit swaps out an old engine for a newer, better engine model built with the latest technology. Repowering results in a better small engine in a vehicle for the fraction of the price of buying a new one.
I Already Have A Quality Engine
If you are a smart consumer, you have already bought a large mower from a reputable brand that stands by its products. So, you may wonder why you would ever want to consider repowering. Consider the Jacobsen Greens King IV. Jacobsen has an incredible reputation for being a leading turf maintenance mowers and equipment manufacturer for over 100 years. The company’s Greens King IV has been one of their best selling vehicles for over a quarter of a century. These mowers, however, will last longer and perform better if their engines are updated to newer models.
The need to innovate and improve performance is well understood by Jacobsen. The company’s newer model Greens King IV has a 16 or 18 horse power Briggs & Stratton Vanguard gas engines. Older models have a 14 or 16 horse power Kohler engines. Improving the engine is important to the long-term life of the mower and to achieve better performance. This is why so many are choosing to repower their landscaping mowers – to give their well-maintained older models more power and extend their life.
Jacobsen Greens King IV is a popular landscaping mower and hauling vehicle manufacturer. As such, there are a variety of repower kits available. There are Briggs & Stratton Vanguard small engines or Kohler small engine rebuild kits available, depending on what engine is currently installed in the GV IV. Diesel models are also great candidates for repower kits. Those landscapers with other mowers brands, something other than a Jacobsen, can easily find a repower kit compatible with their model too.
Where Do I Find A Repower Kit?
Small engine repower or rebuild kits are available from several certified dealers online. When looking for a kit, make sure the one you purchase comes with a warranty that you would expect from the original factory dealer. They are available. This will give you piece of mind and assurance that the quality of your machine will remain intact. After all, repowering a small engine is a step toward improving the value of your mower and extending its life.
~Ben Anton, 2008
I have seen S10’s with 5.3 engines will a 408 stroker fit in a colorado? Or atleast a 5.3 engine?