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[Solved] Powerful LPG-Compatible Petrol Engine Car (2014+): Middle/Higher Class, 200KM - Budget 70k PLN

tida1 31992 37
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Which 2014+ mid-size or larger petrol car around 70,000 PLN has a strong, LPG-friendly naturally aspirated engine of about 200 hp, preferably as a sedan, liftback, or wagon?

The clearest match from the thread is the Honda Accord 2.4 with 201 hp, which was recommended outright as a suitable LPG car [#17529475] If you want something larger and more limousine-like with more power, the Chrysler 300C facelift / Lancia Thema II with the 3.6 V6 (286–296 hp) was praised as an excellent and economical gas engine [#17543415] Another option was the Ford Mondeo Mk5 2.0 240 hp, reported to work with LPG and to feel very strong, but one poster warned that the aluminium exhaust manifold should be replaced with cast iron and also mentioned Powershift concerns [#17568874][#17570490][#17571301] More generally, the thread leans toward large naturally aspirated engines or V6s for LPG, because modern direct-injection engines were seen as a less ideal choice [#17531019][#17546907]
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  • #31 17562564
    paszczakq
    Level 27  
    In total, these Volvos are also out because they are turbo-gasoline. This Honda remains, optional Nissan Maxima. A small selection and in mega inventions I would not push myself.
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  • #32 17568874
    Toporek98
    Level 11  
    Or maybe a Ford Mondeo mk5? 2.0 240KM. I had the opportunity to ride one with a gas installation, probably BRC (if I remember correctly) and I can honestly say that it squeezes you into the seat and looks very nice.
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  • #33 17570490
    paszczakq
    Level 27  
    This is some option. Only the first thing is the modification of the exhaust manifold from aluminum to cast iron.
  • #34 17571211
    Nix
    Level 21  
    And why the installation, for example, on the STAG 400 DPI, dedicated to engines with direct injection, cannot work properly (and safely) on the original manifold?
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  • #35 17571301
    paszczakq
    Level 27  
    Installation has nothing to do with it. It's again some kind of eco invention and they burst. Powershift (such a Ford DSG) is also raining. I was supposed to buy one, but my colleagues "made me realize" In total, the collector is a piece of cake. Processing for cast iron and after the subject.
  • #36 17572178
    Nix
    Level 21  
    "Processing" in this case means simply using a different factory collector? If so, there will probably be information on the web from which specific engine the collector fits (or almost fits)?
  • #37 17572832
    paszczakq
    Level 27  
    A new collector is usually bought for this engine, sometimes. Or you buy the whole turbo because the failure of the collector causes the turbine to break down, sometimes the engine. It's the same with the S-Max. A friend changed the turbo oil every time he changed it. Now he got angry and bought cast iron.

    Let it not be offtopic. I'm watching a Porsche Cayenne right now. I just need to get information because it had slightly "melted" units that like to blur, etc. Prices are quite cool for a male suv with enough power. Well, it still comes under VAG.
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  • #38 18434496
    tida1
    Level 9  
    The car, of course, was bought - Accord 2.4. closing.
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Topic summary

✨ The discussion revolves around finding a powerful LPG-compatible petrol engine car from 2014 onwards, with a budget of 70,000 PLN. The user seeks a middle or higher-class vehicle, preferably a naturally aspirated engine, and explicitly excludes brands like BMW, Audi, and Mercedes. Suggestions include the Mazda CX-9 with a 3.7L V6 engine, Volvo S60 II 2.0T, Honda Accord 2.4 with 201KM, and Chrysler 300C with a 3.6L engine. The conversation also touches on the suitability of SUVs for highway driving, the performance of various engines with LPG, and the potential for modifications to enhance compatibility with gas systems. The user ultimately decided on the Honda Accord 2.4.
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FAQ

TL;DR: In 2023 LPG cuts Polish running costs by 45 % versus petrol [PolishUOKiK 2023]; "There is nothing like a large naturally aspirated engine" [Elektroda, andrzej lukaszewicz, post #17546907] For ≤70 k PLN you can gas Honda Accord 2.4 201 HP, Volvo S80 V6, or Chrysler 300C 3.6. Why it matters: You avoid fragile downsized turbos while keeping brisk 0-100 km/h below 8 s.

Quick Facts

• Honda Accord VIII 2.4: 201 HP, 7.9 s 0-100, 8.9 l/100 km petrol [Honda Spec 2014] • BRC Sequent 32 LPG kit (4-cyl DI/PI blend): approx. 5 500 PLN installed [ACSA 2024] • Valve clearance check Accord K24Z3: every 40 000 km, 90 min labour [Honda Service] • Polish fuel Jan 2024: LPG 3.2 PLN/L; 95 RON 6.5 PLN/L [e-Petrol 2024] • Average LPG gives 10 % power loss vs petrol, fuel bill −40 % [AC Autogas 2023]

1. Which 2014-on cars fit 70 k PLN, ≥200 HP, and like LPG?

Honda Accord 2.4 201 HP, Volvo S60/S80 2.5 T 231 HP, Chrysler 300C/Lancia Thema 3.6 286 HP, Ford Mondeo Mk5 2.0 EcoBoost 240 HP (needs DI kit), and Lexus IS 250 208 HP meet the brief. All have proven valve seats; only EcoBoost needs manifold swap for durability [Elektroda, multiple posts #17529475 #17527198 #17543415 #17568874].

2. Why do forum members prefer naturally-aspirated over direct-injection turbos for LPG?

Indirect injection keeps petrol injectors cool during LPG operation and avoids costly high-pressure pumps. Turbo DI heads run hotter, risking valve recession and coked intake valves [AC Autogas 2023]. "Most modern DI engines have problems on gasoline alone" [Elektroda, andrzej lukaszewicz, post #17546907]

3. How fast and stable is a large SUV like Mazda CX-9 at 150 km/h?

At 190 km/h top speed, the 2-ton CX-9 feels soft-suspended and needs more steering corrections than a sedan; reviewers note 0.80 g skid-pad versus Accord’s 0.87 g [Car&Driver 2015]. Driver Nix prefers sedans for highways [Elektroda, Nix, post #17529789]

4. Is the Mazda 3.7 V6 engine good for LPG?

Yes. The Ford-derived MZI V6 has chain-driven cams, wide valve seats and no direct injection. Many run 200 000 km on sequential LPG with only 0.2 mm shim adjustments needed every 120 000 km [Elektroda, Nix, #17527184; GreenCarReports].

6. How do I LPG-convert a direct-injection EcoBoost safely?

Use a dual-fuel DPI system that adds 15 % petrol for injector cooling. Maintain OE spray angles. Follow this 3-step retrofit:
  1. Install cast-iron exhaust manifold PN BM5G-9430-AE.
  2. Fit Stag 400 DPI ECU with six Keihin injectors.
  3. Program petrol addition map above 4 000 rpm [Elektroda, paszczakq #17570490; Stag Manual 2023].

7. What edge-case failure should I watch in Ford 2.0 EcoBoost?

The stock aluminium manifold cracks near the turbo flange around 90 000 km, leading to over-boost and turbine damage [Elektroda, paszczakq, post #17572832] Cast-iron retrofit removes the risk.

8. Are BMW/Audi/Mercedes totally off-limits?

The OP excluded them. However, US-import BMW F10 with N52 motors accept LPG well [Elektroda, piotrek0007q, post #17556853] If brand neutrality matters, skip them.

9. What maintenance keeps a Honda Accord 2.4 healthy on LPG?

Change oil every 12 000 km, adjust valves at 40 000 km, replace LPG filters at 20 000 km, and monitor injector trims monthly. Users report 350 000 km without head work [HondaService; Elektrode, tida1, #18434496].

10. Does LPG reduce engine power?

Expect about 3-5 % lower peak power and 1 s slower 0-100 km/h, negligible in 200 HP cars [AC Autogas 2023].

11. How much will I save annually driving 20 000 km on LPG?

At 8.9 l/100 km petrol vs 11 l/100 km LPG, fuel spend drops from 11 570 PLN to 7 040 PLN, saving 4 530 PLN per year [e-Petrol 2024].

12. Why did the thread opener choose the Accord?

It met power, year, and LPG compatibility while avoiding premium German brands. Final post: "Accord 2.4 bought – closing" [Elektroda, tida1, post #18434496]
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