₦airaland Forum

dopedealer:
What do you mean by ignition parts pls ?
Car won't start ?

Plugs doing well so far

I mean ignition coils and plugs. CNG has a way of exposing any weakness in these parts

dopedealer:
Went smoothly . Enjoying my ride.
A little change in power almost going unnoticeable. Also transition from pms to CNG or vise versa is almost non noticeable too.
Only complain is limited CNG filling station.
As regards effect on engine , car not speeding or kills plugs or coil , I have personally not experienced any of that so far . Met with other CNG users at filling stations who have been using fo 8/10 months ago . No issues . I save over 20k weekly now . As against the 25k I use to buy weekly. Highest I have filled my CNG for is 5500 for 65Liters . Other days 5k and below .

Nice one. For the ignition parts, especially the plugs, you'll be needing premium ones. All the best!

dopedealer:
I don covert ooo
Enjoying my ride

Congratulations. How is it? Any change in power?

phemmyflexxy:
*PMS/gasoline runs hotter in the cylinder*, but it depends on what you mean by "hotter".

1. *Peak flame temperature*
- *Gasoline/PMS has a higher heat release rate* at stoichiometric conditions.
- In stoichiometric mixtures, gasoline’s heat release rate is higher than CNG.
- That means the instantaneous flame temperature and cylinder temperature peak higher with gasoline. c6bc

2. *CNG has higher ignition temp but slower burn*
- CNG has a high auto-ignition temperature of ∼540°C / 813 K. Gasoline ignites easier.
- CNG burns slower with lower laminar flame speed. At stoichiometric, it has a longer burn duration: ∼27° CA vs ∼24° CA for gasoline at 1500 rpm.
- Slower burn + longer combustion means heat stays in the cylinder longer, which is why CNG often causes higher exhaust gas temps and more heat rejection to the cooling system. 0a6ea3eac6bc

3. *Real engine results*
- When a diesel engine was converted to CNG, the cylinder combustion temperature was _lower_ than diesel at higher speeds.
- But in bi-fuel gasoline engines running on CNG, you often see higher NOx and higher exhaust temps at stoichiometric conditions because CNG’s flame develops faster early on and creates higher local temps.
- One study estimated CNG vehicles release ∼1.6x more heat to the environment per km than gasoline/diesel vehicles, worsening urban heat island effect. That’s mostly due to lower engine efficiency, not hotter combustion. 08ff26a11ad4

4. *Bottom line*
- *Peak cylinder temp*: Gasoline > CNG at stoichiometric.
- *Exhaust/heat rejection*: CNG often runs hotter because of slower burn, longer combustion duration, and lower thermal efficiency in retrofitted engines.
- *Ignition temp*: CNG is harder to ignite - 540°C vs ∼280°C for gasoline. c6bc1ad4

So if you mean "which burns with a hotter flame in the chamber", it’s PMS/gasoline. If you mean "which makes the engine run hotter overall", it’s usually CNG, especially in converted cars.

What kind of engine are you asking about - stock CNG engine or a gasoline car converted to CNG? That changes the answer a bit.

You have said it all.....

phemmyflexxy:
It's sad that most of the comments on this thread are coming from ignorant people...

First thing you need to understand about converting to CNG is that you are not divorcing petrol... The CNG kit is installed as an addition to the PMS engine. This means you can switch from CNG to PMS and vice versa.

The question of getting stranded on long journeys because of lack of CNG stations doesn't matter as long as you have PMS in your car or can access a PMS filling station.

Yes, CNG doesn't manage bad engine... It reveals even little issues... For a responsible car owner this should help you keep your car in check all the time... And fix the little issues before they turn big problems.

I converted my 2013 Corolla since February 2025, ever since, my Honda CR-V has suffered abandonment cause CNG saves me up to 70% of what I would usually spend on fuelling. For those saying plugs and coils gets spoilt often... That's not true... I just changed my plugs last month since conversion.


Another advantage of using CNG is the lower operating temperature. This extends your servicing period and helps your AC run cooler than when using PMS.

There are only 3 disadvantages
1. Boot space
2. Tank weight
3. CNG power is lower. This only means acceleration doesn't pick as fast as PMS.

My advice to you is to find an experienced expert to do your conversion ...
Thank me later.

Nice post, but CNG actually runs hotter

apexquest:
Hello gurus in the house, I need help and guidance.
Recently I noticed that in the morning when I want to leave the house, the car will hesitate to move after I have put it in drive 'D'. After about 4 to 5 seconds, it will engage sometimes with a jerk and begin to move.
For the remaining part of the day it will not do it again untill the next day.
It happens every morning and whenever I have left the car for several (over 5 to 6) hours.

It's a 2008 Rav4.

What do I need to check or attend to, please.??

You have hardened rubber seals in your transmission. It will get worse over time, even getting to the point where you may have to start the car before taking shower.

If you have a reliable gear mechanic, he should be able to fix it by replacing those hardened seals.

Good luck.

Gotocourt:
I bought it from a distributor known for genuine parts 😥. It cost me about 90k in January 2023.
I learnt it's about 200k presently

Puzzling...

Gotocourt:
I bought KYB in 2023, it leaked oil shortly after. It started bouncing last month

Sure you got original KYB? Most of the KYB out there are fake.

BoogieBoogie:
Please how do i know high quality shocks and where i do i get them.My mechanic always recommend i buy belgium shocks in benin where i mostly resident.

Ask for original KYB shocks. Pricey, but will sort you out

phineas:
How you lots willingly provide information without asking "why do you need to know"


that part we all need to relearn

Great question! Market research, solution provision. A part at a time

BoogieBoogie:
The Legs...Especially the front legs,I mean shocks..Shock absorber noise...i have changed countless times with linkage. .After 1 month the noise comes back....Lexus 330..........

Have you tried high quality shocks and got fake?

Gotocourt:
Struts a.k.a shock absorber

Have you tried KYB? There is also SP super. If budget is not a problem, those are good, especially, KYB

Rossididdy:
Steering pump failure... causes stiffness of steering while driving....
sienna 2008

Hope you're not using tokunbo? They're likely bad ones patched up and resold as 'direct' tokunbo. There are reliable new power steering pumps

femi4:
Brake pads

It serves better than the fake ones

If you have the budget, look for original Asimco. There are other good ones too

crazygod:
I'm using a Sienna. A/C is issue for me.

You need a good AC tech. Toyota ACs are pretty simple

minista94:
It's 2012 toyota corolla, yes it's electric steering


Yes I have done wheel balancing and vibration is still there

You need to do a proper diagnostics in order to find the culprit. But if this happens when you apply brakes, have the brake disc checked

merits:
The AC and the steering rack.

Reliable replacements are available. Hope you've not been using tokunbo ones? Get good new ones and rest.

minista94:
My legs always making clunking noise when driving on rough road, have visited mechanic and he said I should change stabilizer link and bushings, I have done that and the noise is still there,

Even when i drive to 80kmh, my steering wheel vibrates, done wheel alignment and still same issue, mechanic said I should change my steering intermediate shaft ( AKA steering knuckle) but I'm skeptical to change that, because I'm tired of wasting money

You didn't state which car this is, but if the steering is electric-assisted, you may need to focus on the steering rack.

On the vibration, have you done wheel balancing?

As a proud Toyota owner, what is that part you wish you could get genuine the first time? What is that part that has sent you to mechanics multiple time and your confidence isn't still restored?

Topmaike007:
Hello my fellow nairalanders good day. Please I got this lexus es330 for more than 6 months now and I noticed the rate it drinks fuel is beyond comprehension. The engine sounds so cool and does not smoke. But the check engine light have been on since I got it from my younger brother, and I have taken it to rewire and I was told there is nothing wrong with my car. But the car is on 17 tyre size. Please make una help me before this car send me back to the village.

When the engine is warm, have someone raise it to around 5000 rpm and observe the exhaust. If dark smoke comes out, your ignition parts are weak

sooperrescue:
Your car shows that it requires premium unleaded fuel. Once your mechanic start to change those particular items you listed, just sell the car because the spark plugs he is going to buy will not be the same as the follow come. Look for octane booster to prevent the final destruction of the car. I said it recently that we are now using our money to destroy our cars. Check your fuel tank cover and you will read unleaded premium fuel only.

The subtle differences in spark plugs......