15 hours ago, RicardoM said:

500,000 km life

That is excluding timing chain

 

15 hours ago, RicardoM said:

regularly

What do you define by regularly? 

I do it every 7000km

21 hours ago, Thefeliciahacker said:

 

I do it every 7000km

Unfortunately, there is something that drivers do not count: it is the time that the engine is idling (for example traffic light, preheating, etc).  It is not only the kilometers that we travel on the road, the engine works in other hours as well, so the 7500 km in the counter are essentially more operating hours thar rolling in the road.

Some guys say'' i change the oils every 7500 km but they live in the country which many times means nice and easy kilometres, the 7500 km in a city means more load for the motor (plus worst cooling).

Those idling waisted hours make the ''city guy'' to change the oils sooner.

22 hours ago, Thefeliciahacker said:

What do you define by regularly? 

This is the second most debated subject on the Internet, right after the JFK assassination

3 hours ago, RicardoM said:

This is the second most debated subject on the Internet, right after the JFK assassination

Hahaha nah I'm just looking for your opinion 

 

4 hours ago, D.FYLAKTOS said:

Those idling waisted hours make the ''city guy'' to change the oils sooner.

Given that I change the oil at around 6-8 months you can say that the usage is pretty much 50-50 in my case. 

The car averages around 10.000 to 12.000 km a year

5 hours ago, Thefeliciahacker said:

Hahaha nah I'm just looking for your opinion 

As often as your pocket allows.

U playing dirty Ricardo haha. 

Anything I would had answered would had been attacked immediately. There are oil wars in forums.

9 minutes ago, RicardoM said:

Anything I would had answered would had been attacked immediately

Nah brother

Bob is the Oil Guy

since 2003

 

https://bobistheoilguy.com/forums/

On 19/08/2021 at 10:58, mikefelicia said:

...and lets face it these engines are not exactly high tec they were never intended to last this long...

 

These engines were designed for minimal changes of parameters in first 250k km - massive improvement of reliability was main reason behind development of 135/136 engine. 

9 hours ago, Papez said:

- massive improvement of reliability was main reason behind development of 135/136 engine. 

Yet they were kept 3 bearing 

12 hours ago, Thefeliciahacker said:

Yet they were kept 3 bearing 

 

They tried 5 bearing prototypes with increased displacement - they had issues with lubrication, so they kept 3 bearings. 

12 hours ago, Thefeliciahacker said:

Yet they were kept 3 bearing 

Well, get a proper engineer's drawing of the 3 bearing crank. Check the width of the journals relative to the overall length of the crank. Add those values together. That is the length you have to fit 5 journals into to keep the engine overall length the same or shorter. Can you actually fit 5 journals that are 3/5 of the width of those on your 3 bearing crank into that space?

1 hour ago, Papez said:

They tried 5 bearing prototypes with increased displacement - they had issues with lubrication, so they kept 3 bearings. 

I'm still not convinced you did not have any part on this car development 

1 hour ago, KenONeill said:

Well, get a proper engineer's drawing of the 3 bearing crank. Check the width of the journals relative to the overall length of the crank. Add those values together. That is the length you have to fit 5 journals into to keep the engine overall length the same or shorter. Can you actually fit 5 journals that are 3/5 of the width of those on your 3 bearing crank into that space?

pressure on each bearing is going to be the same due to force over area but crank flex is far less

Edited 24 August, 20214 yr by Thefeliciahacker

1 minute ago, Thefeliciahacker said:

pressure on its bearing is going to be the same due to force over area but crank flex is far less

If crank flex is actually a factor. The tuned engine I mentioned elsewhere (and several Skoda works tuned 1300s) were safe to 7_000 rpm, beyond which they started to bend the standard pushrods. I don't have to do the work, because I know that someone else has, and they were good enough to publish their results in "Cars and Car Conversions" magazine in the UK, back in the early 1980s.

6 minutes ago, KenONeill said:

he tuned engine I mentioned elsewhere (and several Skoda works tuned 1300s) were safe to 7_000 rpm

it may as well be but frequent rebuilds are going to be needed (it was the same deal when skoda went rallying)

 

7 minutes ago, KenONeill said:

beyond which they started to bend the standard pushrods

obviously to avoid valve float you need stiffer springs and the shock loading goes through the roof, my best upgrade would be titanium push rods

35 minutes ago, Thefeliciahacker said:

it may as well be but frequent rebuilds are going to be needed (it was the same deal when skoda went rallying)

 

obviously to avoid valve float you need stiffer springs and the shock loading goes through the roof, my best upgrade would be titanium push rods

This was all done with standard push rods, as required by FIA Group A rally regulations. On one occasion John Haugland spun a 130RS on the RAC rally, bending a push rod, and repaired the car with one bought from a local scrap yard.

Just now, KenONeill said:

This was all done with standard push rods

and standard springs, that means that over 7000rpm there is float causing the cam followers to start jumping around

On 24/08/2021 at 12:01, Thefeliciahacker said:

I'm still not convinced you did not have any part on this car development 

 

The car was already developed before I was born I just read some books on the topic and found some info from good folks on the internet, who got their hands on prototypes and shared it

iirc, it had just 1mm narrower bearings, it was quite close to production parts, but it needed more work to run properly. So they kept what was working. 3 bearings become issue in higher RPM beyond stock redline (7-8k), where oscillations can break even strengthened Fabia crankshaft.

Edited 25 August, 20214 yr by Papez

1 hour ago, Papez said:

but it needed more work to run properly. So they kept what was working.

That is so God damn classic skoda. 

 

1 hour ago, Papez said:

3 bearings become issue in higher RPM beyond stock redline (7-8k), where oscillations can break even strengthened Fabia crankshaft.

So I was right when talking about crank flex. It could not be held rigid but I don't think it could rev so high up in any case. Except if the valvetrain got significantly lighter and stiffer 

38 minutes ago, Thefeliciahacker said:

That is so God damn classic skoda. 

 

It just was like that in whole communism ridden Czechoslovakia. Chief engineer of the project had to beg to get funds for engine modification. Headlamp supplier was already making reflectors for Samara, so Favorit had to have them too. And so on. Reading story of Favorit development, I was wondering how they were even able to make it.

 

38 minutes ago, Thefeliciahacker said:

So I was right when talking about crank flex. It could not be held rigid but I don't think it could rev so high up in any case. Except if the valvetrain got significantly lighter and stiffer 

 

Yes, it was case of highly modified engines (I don't know what pushrods they use to rev that high). The 130LR that competed in this years Dakar had power reduced to around 130HP to improve reliability - I believe it was because of crankshaft (and they already used 1.4)

I've found this video.

It's related to your conversation right now.

Skoda engine is on the hook and it's been inspected. Also the mechanic is commenting on differences with same era Russian engines.

 

7 hours ago, Papez said:

Samara

I was always wondering about the similarities but I thought Lada was coping the more advanced skoda 

In my mind skoda was that company that should have been left free to innovate and develop given a healthy budget because you could see their potential they could easily compete with western cars if they had the budget

Edited 26 August, 20214 yr by Thefeliciahacker

8 hours ago, Thefeliciahacker said:

Skoda was that company that should have been left free to innovate and develop given a healthy budget because you could see their potential they could easily compete with western cars if they had the budget

During the USSR, communism was more interested in weapons systems and related matters (missiles, armor, space weapons, chemical warfare, secret services, underground factories, etc) than cars or motorcycles for civilians.  The Czech Republic was trapped before the Second World War, it was not only the budget but also the freedom of sale-participation in international exhibitions, competitions-export parts etc.