[suman]

Originally Posted by amitk26

This could be deliberate not an error , I once read on the Tyre bible link (link not handy will provide URL if I can find it again ) that manufacturers do it as a precaution to make the driver feel good while keeping the vehicle still under manageable speed so at low speeds the speed is more accurate then at higher speeds.

Amit, 155 or 165, both equally unsafe speeds wouldn't you )?

[ImmortalZ]

Originally Posted by amitk26

Thanks for nice explanation just one question how lean engine ( less fuel more Air ) can melt engine ? Does this mean that engines are designed in
a way such that full specific heat of diesel is not used in combustion process.

Pardon my ignorance I am not from Automobile or Mechanical Engineering background.

Compression of air is an exothermic process. That means, as air gets compressed, it release heat. However, when fuel gets compressed, it evaporates and absorbs heat. Fuel acts as a coolant inside the engine. Too lean and there isn't much of it there to siphon off some of the heat.

There are also secondary problems like detonation, which causes the fuel to explode without the spark plug due to the high temperature.

A higher octane fuel allows the fuel to stay unburned at higher temperatures, allowing higher compression ratios etc etc.

My info is specific to petrol engines by the way. I'm not too certain on how things like lean burn affect diesels.

[amitk26]

Originally Posted by suman

Amit, 155 or 165, both equally unsafe speeds wouldn't you )?

Fully agree on that but that is what the the tyre bible page said it is a is US site I guess and pretty good for selecting rims and tyres.

Originally Posted by ImmortalZ

Compression of air is an exothermic process. That means, as air gets compressed, it release heat. However, when fuel gets compressed, it evaporates and absorbs heat. Fuel acts as a coolant inside the engine. Too lean and there isn't much of it there to siphon off some of the heat.

There are also secondary problems like detonation, which causes the fuel to explode without the spark plug due to the high temperature.

A higher octane fuel allows the fuel to stay unburned at higher temperatures, allowing higher compression ratios etc etc.

My info is specific to petrol engines by the way. I'm not too certain on how things like lean burn affect diesels.

The heat due to compression escaped my attention earlier thanks for nice explanation , I guess the same logic should be applicable to Diesels except that compression ration is many times more in CRDI engines and situation is more severe then petrols.

[ak-47]

Originally Posted by ram.west

Thanks ak for the report. So approximately the 165kmph depicts its 155kmph as said in the manual.

But can the bull do more???

Cheers,
Ramesh

I have read about rpm/speed locks (170 ?) in Safari 2.2 elsewhere in the forum. Never tested though.

Originally Posted by amitk26

This could be deliberate not an error , I once read on the Tyre bible link (link not handy will provide URL if I can find it again ) that manufacturers do it as a precaution to make the driver feel good while keeping the vehicle still under manageable speed so at low speeds the speed is more accurate then at higher speeds.

Could be deliberate. I too have come across such reports. But, for the end user, it's an ERROR in the gauge, nevertheless.

[raj_5004]

Originally Posted by ak-47

Could be deliberate. I too have come across such reports. But, for the end user, it's an ERROR in the gauge, nevertheless.

how can they deliberately add an error only at higher speeds such that the lower speeds are accurate? if its deliberately added, it should be present in the same amount at lower speeds as well.

i feel its a shortcoming of these mechanical speedos, the higher the speed, the greater the error.

[supremeBaleno]

Originally Posted by ram.west

So approximately the 165kmph depicts its 155kmph as said in the manual. But can the bull do more???

@Ramesh, those speeds are already too dangerous for a high C.G. vehicle like yours. Especially on our kind of roads. Slow down, buddy.

[ram.west]

Definitely SB . Just wanted to know how much i could max her out. And I did it in the Bangalore Highway in a pretty straight section . Usually i just cruise along between 80-120 on highways, I think thats the best range where we get max comfort and control over the vehicle.

Cheers,
Ramesh

[dadu]

Originally Posted by ram.west

Thanks ak for the report. So approximately the 165kmph depicts its 155kmph as said in the manual.

But can the bull do more???

Cheers,
Ramesh

The official Top speed for Safari 2.2l is 160kmph, I have touched that and engine holds itself back when it starts nearing 163.

The speedo is calibrated to absorb errors unless you change the stock tyre profile.

[ram.west]

Thanks dadu, for the information. I'm running on stock setup only. And yes , I have no plans of doing that again. As I said I'm more comfortable in that 80-120 range.

[amitk26]

Originally Posted by raj_5004

how can they deliberately add an error only at higher speeds such that the lower speeds are accurate? if its deliberately added, it should be present in the same amount at lower speeds as well.

i feel its a shortcoming of these mechanical speedos, the higher the speed, the greater the error.

Very Easy by making a non linear gauge and or in your words introducing shortcoming by design rather then by chance to give a feel good factor to driver,
Why I say this could be deliberate because the same error is not reflected in Odometer but only in Speedo while both are deriving the rotation count from same point .

Odometer is quite noticeable and user has fair idea of distances it would be foolish to make it inaccurate and may be illegal too.

EDIT : Here I am not talking about Safari in particular but considering the cars which have mechanical odometers.

You can introduce this non linear speedo error yourself by changing tyre size / profile. There will be a small error per rotation of tyre and it will keep on increasing with number of rotations per unit time so at high speed the error will be quite noticeable but this will be reflected in Odometer too.

Manufacturer can introduce this kind of error at any point in only in mechanical speedometer by using a slightly different size of gear.

[jkdas]

Check this mod. Neat one.

[amitk26]

Originally Posted by jkdas

Check this mod. Neat one.

cool mod JK can you post picture from below to show how pipe is routed
and what you did fir extending it.

Probably you can attach a steel muffler extension

I saw a similar mod where Pipe was routed from the hatch / lid below number
plate avoiding bumper cutting but exhaust pipe was looking little out of the place in center.

[Bull_Twin]

Hey,

May be mine the youngest Safari/Bull on T-BHP. Thanks to you guys specially ADC, irrespective of known niggles and issues , I went for it.
Its Cycus Grey- LX , 2500KM run and a month old.
Twice I had the hose pipe blown. I dont know the purpose or reason for this Orange coloured pipe, but when the pipe was blown Bull couldnt move more then 15KM/hr. Driving 120 KMs from Palwal to my place at 11 PM was painful. The only assurance I have is A-ONE motors will change the whole assembly if the pipe blows out again. (Is it something serious??)
A bit scared to check TSK's issues and soon will dare again to take my bull on a long drive.

Soon will post pics...
Cheers
B_t

[amitk26]

Are you talking about Turbo hose ?

Originally Posted by Bull_Twin

Hey,

May be mine the youngest Safari/Bull on T-BHP. Thanks to you guys specially ADC, irrespective of known niggles and issues , I went for it.
Its Cycus Grey- LX , 2500KM run and a month old.
Twice I had the hose pipe blown. I dont know the purpose or reason for this Orange coloured pipe, but when the pipe was blown Bull couldnt move more then 15KM/hr. Driving 120 KMs from Palwal to my place at 11 PM was painful. The only assurance I have is A-ONE motors will change the whole assembly if the pipe blows out again. (Is it something serious??)
A bit scared to check TSK's issues and soon will dare again to take my bull on a long drive.

Soon will post pics...
Cheers
B_t

[Bull_Twin]

No idea if its Turbo hose or what.. but its orange or red colour. The vehicle didnt accept any acceleration and if accelerator is pressed it gives loud hsssss noise.
Another issue which has been reported earlier by many guys is drifting towards left when break is applied. Hope these are not serious.