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Old 26th November 2012, 20:54   #151
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Default Re: JEEPS of the Charminar offroad club

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Kind of heard it shuts of the air supply to the engine and the engine runs on some gases, not sure.

UBS sir can explain the mechanism.
Franky, air is also a gas , would be interesting to know more about this.

On a serious note, please update the photos and share more on this. I hope UBS Sir also chips in.

Spike
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Old 27th November 2012, 19:13   #152
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Default Re: JEEPS of the Charminar offroad club

It seems the cable from the dash closes two pvc valves, thus closing the engine breathers , so the engine only breathes form the snorkel .
Got to know from the owner of the vehicle.
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Old 27th November 2012, 20:42   #153
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Default Re: JEEPS of the Charminar offroad club

But I dont see that Jeep having a Snorkel or am i missing something here? What about water over Bonnet level? How does it manage?

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Old 27th November 2012, 20:52   #154
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Default Re: JEEPS of the Charminar offroad club

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But I dont see that Jeep having a Snorkel or am i missing something here? What about water over Bonnet level? How does it manage?

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Vikram , the mushroom type cover you see on the air filter is removed and a flexi pipe is connected to the airfilter and let out of the bonnet , the mushroom cover is connected to the top of the pipe to act as a snorkel.

There are 2 breathers the fording system closes, one near the carb and the other near the fuel pump.
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Old 28th November 2012, 18:51   #155
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Default Re: JEEPS of the Charminar offroad club

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2004 MM550, NGCS
XD3P TURBO WITH Scorpio turbo and scorpio water pump
How do you get an XD3P to run reliably on a turbo? I think the stock engine runs 24:1 compression which is too high for turbo-charging? Head-mods?
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Old 28th November 2012, 20:50   #156
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Vikram , the mushroom type cover you see on the air filter is removed and a flexi pipe is connected to the airfilter and let out of the bonnet , the mushroom cover is connected to the top of the pipe to act as a snorkel.

There are 2 breathers the fording system closes, one near the carb and the other near the fuel pump.
Could we have the pleasure of seeing them? The flexi pipe let out of the bonnet as well as the breather routing from the carb and fuel pump, the breathers from the GB, Front and rear Differentials

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How do you get an XD3P to run reliably on a turbo? I think the stock engine runs 24:1 compression which is too high for turbo-charging? Head-mods?
A mild boost would not harm the engine. Infact it gives better efficiency. Most of todays diesel engines in India are mild turbos

Last edited by n_aditya : 28th November 2012 at 20:57. Reason: posts merged.
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Old 28th November 2012, 20:57   #157
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Default Re: JEEPS of the Charminar offroad club

Yeah but the Thar runs like 17:1 compression unlike the XD3P's 24:1. Also since diesels are compression-ignition engines, doesn't changing the CR effectively change the ignition timing itself? I was under the impression that even a mild boost to an "high-comp, NA-by-design" engine will make it deto badly...

Last edited by vivekjayasheel : 28th November 2012 at 20:59.
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Old 29th November 2012, 09:07   #158
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Default Re: JEEPS of the Charminar offroad club

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How do you get an XD3P to run reliably on a turbo? I think the stock engine runs 24:1 compression which is too high for turbo-charging? Head-mods?
Dear Vivekjayasheel - original variant of XD3P engine with turbo was made by Peugeot France. Crankshaft material (metallurgical composition) was completely different to take the additional load. Please do not attempt with production crankshaft. We had tried in the laboratory just to see, it broke like a matchstick.

Best regards,

Behram Dhabhar
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Old 29th November 2012, 10:45   #159
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Default Re: JEEPS of the Charminar offroad club

Respected sir, I am not attempting anything like this (for that I first have to find a jeep
:-D). I was merely curious about what Frankenstein said in his post. Thanks for chipping in, I had no idea that the French XD3 came with a turbo...
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Old 29th November 2012, 13:18   #160
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Default Re: JEEPS of the Charminar offroad club

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Dear Vivekjayasheel - original variant of XD3P engine with turbo was made by Peugeot France. Crankshaft material (metallurgical composition) was completely different to take the additional load. Please do not attempt with production crankshaft. We had tried in the laboratory just to see, it broke like a matchstick.

Best regards,

Behram Dhabhar
Sir,

With due respects to your experience, observation and logical explanation. How come shaft on the blue 550 from Hyderabad is still working, one you had seen at MCUBE, this year?
Regards,
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Old 29th November 2012, 14:13   #161
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Default Re: JEEPS of the Charminar offroad club

Dear Fazal - thanks for asking. In a vehicle, a typical engine gets loaded to about 30% of its capability only. I am talking of failure on the engine dynamometer. By the way, have you ever seen the exhaust manifold of an F4/134 engine glow red hot in any vehicle? It glows red hot during FTP test under full load on the dynamometer. Maybe the blue vehicle engine's crankshaft will give infinite life but that does not change the design loads and parameters. That's why life test for an engine is conducted on the dynamometer.

Best regards,

behram Dhabhar
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Old 29th November 2012, 14:37   #162
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Default Re: JEEPS of the Charminar offroad club

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Dear Fazal - thanks for asking. In a vehicle, a typical engine gets loaded to about 30% of its capability only. I am talking of failure on the engine dynamometer. By the way, have you ever seen the exhaust manifold of an F4/134 engine glow red hot in any vehicle? It glows red hot during FTP test under full load on the dynamometer. Maybe the blue vehicle engine's crankshaft will give infinite life but that does not change the design loads and parameters. That's why life test for an engine is conducted on the dynamometer.

Best regards,

behram Dhabhar
Dear Sir,
Should we laymen infer from your technical jargon filled sentence that partial turbo (somewhat similar to turbo fitted in M&M’s DI engine) can be fitted and used successfully in XD3P engine? Of course considering that engine would be loaded to 30% of its capability.

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Shubhendra Singh
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Old 29th November 2012, 19:05   #163
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Default Re: JEEPS of the Charminar offroad club

Dear Frankenstein and Behram-sir, I also have a question but pardon me if it seems stupid...

How do you control the "ignition timing" on a vehicle that has been retro-fitted with a turbo?

Firstly, is it that the turboed XDP is running the same 24:1 CR? If not, how was the CR reduced?

If the CR was not reduced, did you also have to use other Scorpio engine parts (like the injectors and pump and other stuff) to ensure that the diesel injection (and therefore ignition) happens at optimum times in turbo, and non-turbo mode (non turbo means maybe at really low RPMs)?
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Old 29th November 2012, 19:08   #164
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Default Re: JEEPS of the Charminar offroad club

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How do you get an XD3P to run reliably on a turbo? I think the stock engine runs 24:1 compression which is too high for turbo-charging? Head-mods?
Well its running from the past 20k kms, lots of events , fishing camps, pedal to the metal drives by me.

Both the blue and white 550 are running just fine.
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Old 29th November 2012, 21:02   #165
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Default Re: JEEPS of the Charminar offroad club

Well I was asking about the "how" of things, not questioning the reliability. :-) Anyway, this seems like a good way of increasing the XDP's power for people who don't want to go for a transplant...
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