Author Topic: Question about petrol/gasoline engine oils  (Read 5304 times)

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Offline joeqsmith

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Re: Question about petrol/gasoline engine oils
« Reply #50 on: August 19, 2023, 01:57:00 am »
...In the last decade or 2 technology has offered massive improvement to high performance needs as even low budget teams all have laptops to extract run logs and analyse where improvements are needed and of course the other benefit is identifying race system faults and the conditions that might lead to them.
...

I looked at buying a logger at one point and talked with some of the big players but they didn't offer what I wanted.  Many of the loggers back then would do 1 sampler / second!! Better ones, 0.1 second.  I was asked by one of the big players, why would I need anything faster.   It's like they had no clue how much things were changing in that first second, especially with the clutch.   So, some FPGA and software...   Nowdays, one PIC. 

You like turbos and 2-steps.  Here is some very old data showing one of my old Rajay turbo chargers spooling up compared with my custom made Comp Turbo with triplex ceramic bearings.   Note at 0 seconds, the bike is making 12 PSI of boost with the old Rajay and within 0.2 seconds its making over 18.     The Comp Turbo may seem worse but once I spanked the monkey, she comes up quick.   Too much and the tire spins.....  How do you know?  It's all in the data..... 

Offline tautech

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Re: Question about petrol/gasoline engine oils
« Reply #51 on: August 19, 2023, 02:17:27 am »
I was asked by one of the big players, why would I need anything faster.
:-DD
One wonders about their pedigree in this game.  ;D

Are you using a slider clutch variation on your bike Joe ?
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Offline Ground_Loop

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Re: Question about petrol/gasoline engine oils
« Reply #52 on: August 19, 2023, 02:30:37 am »
I have 17 internal combustion engines at my house: diesel, two stroke, 4-mix, 4 stroke.  The rule of thumb for all engines is: oil shouldn’t be in the engine long enough to matter.  Having said that, some of those are very high performance engines that get the recommended oil at better than recommended intervals. But plain 10-30 or even straight weight 30 is more than adequate for a mower.
« Last Edit: August 19, 2023, 02:41:37 am by Ground_Loop »
There's no point getting old if you don't have stories.
 

Offline joeqsmith

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Re: Question about petrol/gasoline engine oils
« Reply #53 on: August 19, 2023, 02:33:00 am »
I was asked by one of the big players, why would I need anything faster.
:-DD
One wonders about their pedigree in this game.  ;D

Are you using a slider clutch variation on your bike Joe ?

On my 40 year old bike, I am using a multi-stage lockup with a billet basket and straight cut gear.    I am a one man band, so no crew to start the bike or tow it.   I knew a guy who made a slider where he could change the stall with a switch.  Pretty good idea. 

Offline John B

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Re: Question about petrol/gasoline engine oils
« Reply #54 on: August 19, 2023, 02:37:31 am »
So I think the answer to what oil is best for a lawnmower is 1ms polling rate EGT sensors, closed loop wideband AFR correction and FPGA implemented DSP windowed knock detection and fuel film model transient throttle fuel delivery.
 

Offline joeqsmith

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Re: Question about petrol/gasoline engine oils
« Reply #55 on: August 19, 2023, 02:39:44 am »
My street bike is a bit more fancy and clouds your question on if its a lockup or a slider.  How about, it depends...   Some rules would require a hand clutch, but what does that really mean?  :-DD   

Offline tautech

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Re: Question about petrol/gasoline engine oils
« Reply #56 on: August 19, 2023, 02:51:20 am »
I have 17 internal combustion engines at my house: diesel, two stroke, 4-mix, 4 stroke.  The rule of thumb for all engines is: it shouldn’t be in the engine long enough to matter.  Having said that, some of those are very high performance engines that get the recommended oil at better than recommended intervals.
Yet many modern automotive engines run EGR for which you should use an EGR rated oil.

A little story if I may....
A lifelong buddy changed his work van, loaded with 500kg min and everyday at least another 500-1000kg of goods to install at work.
It was his first turbo diesel and asked his mate, a Valvoline rep for a oil recommendation to run in it.
He is a fastidious owner and every vehicle he owned was always very well serviced.

The change period was specified at 5000km however increased oil consumption started occurring at 3500km and he needed topups before the change period was due.
He asked for advice and quick study revealed the engine in this van had an EGR system and specialist oils were specified for it.

BS he told me but I insisted rather than continue to use the muck he was, instead visit the local auto everything shop and get (brand, type) oil pack for his next change.
He did and oil consumption before the next change period miraculously disappeared.

There's very good reason why I go to significant effort to disable any EGR capability........
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Offline tautech

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Re: Question about petrol/gasoline engine oils
« Reply #57 on: August 19, 2023, 02:53:26 am »
My street bike is a bit more fancy and clouds your question on if its a lockup or a slider.  How about, it depends...   Some rules would require a hand clutch, but what does that really mean?  :-DD
For the base weight your clutch would certainly comply.  ;)
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