General > General Technical Chat
Question about petrol/gasoline engine oils
tautech:
--- Quote from: joeqsmith on August 17, 2023, 12:21:17 pm ---
--- Quote ---Of course not, that Detroit is a diesel and requires a high detergent diesel oil.
--- End quote ---
Bigger difference, we are not blending oil into the fuel to act as a lubricant like all of my 2-strokes.
--- End quote ---
Diesel itself is an upper cylinder lubricant so only the bottom end requires lubrication.
All large ship engines are 2 stroke semi-diesels running on fuels more like crude oil than anything refined we consumers use. 2 stroke diesels have come in several types over the decades and one popular when I was young was the English Commer T3 horizontally opposed 3cyl truck engine.
--- Quote ---Typically they used Castor oils as a lubricant when I fiddled with such stuff too several decades ago.
--- End quote ---
I don't remember if I had to mix anything in that toy diesel or not. You had an adjustment for the CR and a way to add heat. [/quote]
Yet here we didn't need to heat them, only reduce compression some to start, unlike the gloplug model engines.
--- Quote ---I mix them the same, rich. I'll take smoke over a damaged engine any day. All of the ones I own use a carb.
--- End quote ---
Amen to that. At 40:1 I start getting nervous and 50:1 well just :scared:
--- Quote ---It's not an encoder problem but a SW problem as the encoder polling on SDG models is too slow to combat Joe's high speed life.
--- End quote ---
And here I thought I was being slow with it. I wonder when they did the system design, did marketing, EE management or quality control think it was good enough. [/quote]
Obviously, however they are getting flack for it now from me as a user/dealer but not for normal use where certainly it could be better, but for related encoder usage when it is way suboptimal.
--- Quote ---my neighbor setting a NZ record a few years back
--- End quote ---
8.66 @ 153 in what distance do you use over there? [/quote]
1/4 mile, 440yds. AFAIK we don't have any shortened strips here.
12A is the older low capacity 2 rotor engine however that one was running Methanol with 40lbs of boost.
Not sure how it dynoed but it will be approaching 800hp.
--- Quote ---Been following a channel where they are attempting to reassemble a 12-rotor boat motor. It's the size of a big-block. There are videos of the owner/designer running it.
--- End quote ---
Leading edge builds are always fun and good luck to him.
3 rotor builds are common as they were a std Mazda build known as the 20B that the neighbor pushed to 1400hp to then have all sorts of issues getting it to hold together as it kept breaking from the engine plate at launch so substantial redesigns were needed including billet end plates recessed into the plate and with additional fixings....still a work in progress.
joeqsmith:
--- Quote from: tautech on August 17, 2023, 08:01:31 pm ---Diesel itself is an upper cylinder lubricant so only the bottom end requires lubrication.
--- End quote ---
Indeed, diesel acts as the lubricant. This was one of the downsides of using methanol. Great fuel but required mixing in oil. Then there was draining the system.
--- Quote ---1/4 mile, 440yds. AFAIK we don't have any shortened strips here.
12A is the older low capacity 2 rotor engine however that one was running Methanol with 40lbs of boost.
Not sure how it dynoed but it will be approaching 800hp.
--- End quote ---
Nice. I see most of the bikes are now over 600HP with street tires and no bar. I doubt any of my bikes are more than 200 when I lean on them. 30 is about the limit for C16 gasoline but currently the bike can run in the 7's with 22PSI.
tautech:
--- Quote from: joeqsmith on August 18, 2023, 12:05:00 am ---
--- Quote from: tautech on August 17, 2023, 08:01:31 pm ---Diesel itself is an upper cylinder lubricant so only the bottom end requires lubrication.
--- End quote ---
Indeed, diesel acts as the lubricant. This was one of the downsides of using methanol. Great fuel but required mixing in oil. Then there was draining the system.
--- Quote ---1/4 mile, 440yds. AFAIK we don't have any shortened strips here.
12A is the older low capacity 2 rotor engine however that one was running Methanol with 40lbs of boost.
Not sure how it dynoed but it will be approaching 800hp.
--- End quote ---
Nice. I see most of the bikes are now over 600HP with street tires and no bar. I doubt any of my bikes are more than 200 when I lean on them. 30 is about the limit for C16 gasoline but currently the bike can run in the 7's with 22PSI.
--- End quote ---
Methanol really woke these rotary's up and at one time neighbor only ran C16 in them yet in his first car, a tubbed RX3 with a blown 13B he progressed from 12s runs to just under 10s with only tuning of the chassis.
When that was sorted and further pedalling experience gained engine builds improved for that same car to run 8.66s with another motor.
joeqsmith:
Higher boost and cooling over the C16. I spray a small shot with the bike not having an intercooler. Drops the temp a fair bit.
John B:
Lots of interesting discussion. But I'm surprised that Honda recommends 10w-30 since it will thin out a bit in an air cooled engine, particularly if you're going to be using your petrol equipment in the aussie summer. I run all my 4 stroke small motors on 10w-40, ie mower, mulcher, brushcutter, pressure washer
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