How often should AFR adjustment be made? Is LPG harmful to the engine? We are trying to correct frequently asked questions about vehicles with LPG conversion, to correct mistakes known to be correct, and to eliminate the question marks that are frequently placed on the minds of users regarding AFR adjustment.

+++ Misunderstandings / Frequently Asked Questions

Question: Are valves not melting because of the high combustion temperature of LPG?

Answer: The problem is not the combustion temperature of LPG. LPG’s burning calorific value is only 4.8% higher than gasoline. This is not an excess that will cause any deformation in the valves or the engine.

Let’s evaluate this proposition from two sides. The first is a gasoline solvent. We use gasoline to dissolve grease and dirt on an oily part, a dirty part. It is absurd to think that gasoline is lubricating when such a situation exists.

The second aspect is that the valves with which gasoline comes into contact are intake valves. Melting valves are exhaust valves where the fuel does not come into contact from the top.

Question: Is there a difference in compatibility between LPG systems and vehicles?

Answer: All inline LPG kits contain the same main elements. ECU (Electronic control unit), Regulator, Injectors. The work they do is the same. There are various kits available in a wide price band. Of course there are differences between them in terms of material quality. But it is the assembly and adjustment quality that makes a kit compatible with the vehicle. That is to say, while a well-adjusted average kit can get results indistinguishable from gasoline, the quality of the material sold at very high prices in the market will not be achieved if a kit is not correctly assembled and adjusted precisely with the sensor. So, as is the case with most tools, the skill is in the user / driver, not in the device. The setting that drives the kit is also.

Question: Can the lubrication systems in LPG kits prevent valve melting?

Answer: This proposition should also be considered from various angles. First of all, the valves that this oil touches will be intake valves and there is no melting in these valves. The second part is known in vehicles that oil is not required to enter the combustion chamber, oil burning is the biggest enemy of a vehicle. According to the findings, these lubrication systems are:

  • Spark plugs get wet / greasy for these reasons; misfires and inability to burn efficiently at full throttle.
  • Contamination in the catalytic converter and the exhaust end, soot at the exhaust end.
  • Avoid burning oil smoke and odor at cold start.

It causes unwanted things like. In short, this oil to be supplied with the fuel in the manifold will not have any positive benefits and there is a risk of damaging various parts.

Question: Is LPG fuel harmful to the engine due to its nature? What are the things to watch out for?

Answer: LPG fuel is a fuel that is beneficial to the engine and the environment compared to Gasoline under the same burning conditions with the correct setting.

  • In LPG combustion, LPG, which consists of Butane-Propane gases, burns completely inside the engine. Thus, it extends the life of the catalytic converter.
  • Since it burns completely and due to its structure, it does not form soot in waste gas like gasoline. For this reason, engine oil stays cleaner. Soot will form later on your spark plugs. This shows that our oil will make the engine lubrication task easier and keep it cleaner. At the same time, our ignition performance will not decrease as our spark plugs will become dirty later.
  • It is more environmentally friendly. CO2 emissions are less and there is no soot / particulate combustion. We throw lots of water vapor from our exhaust. The exhaust of LPG vehicles is very clean.
  • Gasoline is a fuel with 95-97 octane. On the other hand, LPG changes between 102 and 110 octane depending on the Butane-Propane ratio in it. This shows that LPG’s combustion quality and resistance to tough conditions are higher, and the possibility of hammering and knocking during combustion is lower.

In the light of all this information, we can say that the engine of an LPG vehicle that is correctly adjusted and working properly with all its equipment will have a longer life.

LPGTuned & LPGAYARI.COM – Professional LPG AFR Tuning and Solution Center – Ahmet Nalbantoğlu

Saray mh. Sanayi cd. Ozentas San.Sit. Orta Kat E Blok. No:7 Ümraniye / İSTANBUL
+ 90 (555) 166 93 00


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