Sorry if I wasn't clear in my previous posts, I never wanted to discuss which engine in which car was faster. I only wanted to prove that the M1000 Auto journos drove in 1989 had a F10A engine only, not a G13B engine.
The photos of the engine bay of the test car, of bhpian
the mole's 92 M1000 & of bhpian
sohanbala's 1995 Esteem make this point clear.
I only talked about the performance figures because of the fact that whatever they drove in 1989 was way off the mark of Esteem's (G13B carb) figures. They were impressed with the performance of the M1000 going by the report, even then the numbers posted by that car were way off the mark that would be set by the Esteem (G13B carb) in 1994.
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Originally Posted by vivekgk Thanks for posting the detailed reports and bringing clarity to the discussion.
I was also trying to track down these magazines and reports. In fact I'm still looking for that report that had mentioned the engine swap theory.
I've gone through the reports, and noted the following points: - It is mentioned clearly that they were testing a secret prototype that had come to India the month before.
- The F10A in the 1000 makes slightly more power and slightly less torque than the Gypsy version.
- He notes that on paper, these figures do not seem impressive and that the power to weight ratio is lower than even the M800.
- IT was the quickest car they had ever tested, even beating the 88bhp Contessa Classic with a better power to weight ratio!
- Acceleration and performance is termed as 'invigorating', 'rapid' and 'terrific', due to the ideal gearing.
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Yes, from the report it is clear that the M1000 that they drove was Japanese (CKD most likely). It could be possible that car was running on a more aggressive/different tune compared to what we ended up getting. This theory could be true.
Even for M800, people always found the cars equipped with Japanese Mikuni carburetor performed slightly better compared to the cars equipped with made in India carburetor.
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Also consider that the Original 1993 Zen was accepted to be a nippy car for its time. At launch, it had a 50bhp G10B and weighed 730kg, giving it a power to weight ratio of 68.5 bhp/ton, still a lot better than the M1000.
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Since you have brought up the topic of Zen, let me give my point about how a Zen drove. I have owned 2 of these, first a 98 Zen carb, then later a 01 Zen MPFi.
The Zen carb was tested by ACI to do the 0-100 dash in 16.30 seconds, which is a good enough time. Though in reality the Zen carb had horrible low end torque, in city traffic one would need to constantly downshift to keep the engine on the boil. Move up the rev range, the Zen moves briskly, the power deficient w.r.t Zen MPI isn't noticeable high up the revv range (Zen mpi has 10bhp more, 60bhp vs 50 bhp). The top end is also good, the G10B carb likes to be revved, an enthusiasts motor indeed. After getting past the weak low end, Zen carb feels fast enough & can easily keep up with many modern cars.
The driving characteristics of Zen carb was quite opposite to most other cars from that era, downshifting 1/2 gears to accelerate quickly was an alien concept to most drivers. I learnt driving in a M800 & a Omni, in those cars one would one want to move up the gears as quickly as possible (without lugging the engine). There was no concept of dropping down a gear or two to make a quick overtake. Those engines simply didn't have any top end performance to talk about.
The Zen MPFi on the other hand had good low end torque (though not as much as say a F10D), one didn't need to constantly downshift to keep the car moving in flowing traffic. Even that engine loved to be revved, with the motor pulling cleaning in the high rev range. The Zen MPFi did 0-100kmph in 14.68 as per ACI. I replaced my Zen MPFi with a Swift G13B.
Zen timing figures courtesy ACI:
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Originally Posted by PSM_360 The biggest difference between M1000 and carb esteems is the engine bay/powertrain. They are quite different, be it engine, gearbox, flywheel, clutch set, carburettor, etc. Well, recently fitted replaced the carb with a Zen carb, it fits but has some extra vacuum lines which I have blocked. Gearbox bell-housing is different to that of an Esteem/Zen. |
Even the fueling system was different/advanced in the Zen/Esteem. These cars even in carburetor avatar got an electronic fuel pump (which was placed in the fuel tank), whereas the likes of M800, Omni, M1000 got a mechanical fuel pump (which was placed near the carburetor). I am not entirely sure about the technical differences, but the biggest difference to the end user was that a Zen, Esteem carb would start in one crank (cold start). My Omni on the other hand, especially if left idle for 15-20 days would need 3-4 cranks before the engine would fire up. The fuel line would dry up partially & since there is no actual pump to pump fuel from the tank, it would take some time to fire up.
Even the ignition system was different & more advanced in the G series engine. The distributor on the F series engines would need periodic replacement of the distributor breaker point, as per my 99 Omni's user manual they need replacement every 20k km. Fiddling with the distributor means doing the Ignition timing once again.
In short, the G series engines were more advanced compared to the F series engines in carburetor guise, & generally needed less maintenance.