Recent Topics
Best recommendation for Honda 10w30 trans
by Pepsibottle1
25 minutes 58 seconds ago
Mills Fleet Farm Roadrunner batteries - who makes?
by volk06
Today at 01:09 PM
Honda ATF DW1 bottle stamp decoding
by parshisa
Today at 12:03 PM
How to lower throttle sensitivity?
by NICAT
Today at 11:41 AM
That's some service! (New Central AC...)
by xBa380
Today at 11:13 AM
Valvoline 2 Cycle TC-W3 Marine Oil - 6qt - $20
by Jimzz
Today at 10:45 AM
Plumbing/Bldg Experts: Cause of Wet Slab?
by LoneRanger
Today at 10:13 AM
How to CONFIRM the Country of Manufacture
by Ed_Flecko
Today at 09:58 AM
Replacing trans oil seal
by redhat
Today at 09:50 AM
VW diesels sitting in huge lots waiting......
by ZZman
Today at 09:09 AM
DTD/DT Independence Day Promos
by Sayjac
Today at 08:39 AM
It's AMSOIL®, not Amsoil
by Rat407
Today at 06:39 AM
VW Passat 2007
by madRiver
Today at 06:18 AM
Review: CVJ Remanufactured CV Axles
by The Critic
Today at 03:40 AM
Towing without 85w140?
by OilFilters
Today at 03:07 AM
2015 VW GTI autobahn oil questions
by Skyalbo
Yesterday at 11:28 PM
Corrosion in the garage - salt or humidity?
by Kurtatron
Yesterday at 11:13 PM
Darn dogs
by AZjeff
Yesterday at 10:21 PM
New GC?
by Bullwinkle007
Yesterday at 10:04 PM
The guy with the plexiglass head on you tube
by andyd
Yesterday at 09:21 PM
Newest Members
dhy808, ROD_Z, lozpxs, danthemanx07, FunktasticLucky
65319 Registered Users
Who's Online
87 registered (AndyB, 4WD, 87sammy, aquariuscsm, 9050lx, AZjeff, 10 invisible), 1686 Guests and 31 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
65319 Members
67 Forums
285971 Topics
4772301 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Topic Options
#4783437 - 06/10/18 09:52 PM 2 cycle lubrication
Burt Offline


Registered: 01/08/09
Posts: 1311
Loc: texas
A small amount of gasoline in the oil of a four cycle engine is a bad thing, but some 2 cycle engines use mostly gasoline with a small amount of oil to provide adequate lubrication. I realize they are different systems but how do they get away with this? And of course no filtering other than in 2 cycles’ gas tank.
_________________________
2011 RX350 53k miles
2015 Fiesta SFE eco-boost 24k miles

Top
#4783441 - 06/10/18 09:59 PM Re: 2 cycle lubrication [Re: Burt]
AVB Offline


Registered: 05/20/12
Posts: 1283
Loc: Georgia
Different materials and bearing types. Most modern 2 strokes use roller bearings.

Top
#4783443 - 06/10/18 10:02 PM Re: 2 cycle lubrication [Re: Burt]
WobblyElvis Offline


Registered: 09/23/14
Posts: 1355
Loc: Toronto Canada
Two stroke oil is a little different. It resists burning or it would gum up the rings and exhaust system very fast. When you see the blue/purple smoke from a two stroke, that's tiny droplets of oil in the air. The fuel/oil mixture is passed through the crankcase where it lubricates the crank and rod bearings which are roller or needle type. This kind of bearing can get by with far less oil. Some oil will settle in the crankcase where it is scavenged and returned to the intake port.


Edited by WobblyElvis (06/10/18 10:03 PM)

Top
#4783450 - 06/10/18 10:17 PM Re: 2 cycle lubrication [Re: WobblyElvis]
aquariuscsm Online   content


Registered: 12/30/06
Posts: 18183
Loc: Dallas,Tx USA
Originally Posted By: WobblyElvis
When you see the blue/purple smoke from a two stroke, that's tiny droplets of oil in the air.


My old Yamaha DT175 would literally spray oil all over your back while you were riding it.
_________________________
1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Pennzoil Platinum 0W20



Top
#4783461 - 06/10/18 10:30 PM Re: 2 cycle lubrication [Re: Burt]
AVB Offline


Registered: 05/20/12
Posts: 1283
Loc: Georgia
Also fresh oil is constantly being sucked through the engine and flushed out of the exhaust. There is no dirty oil circulating. The air filter is super important though.

Top
#4783507 - 06/11/18 01:02 AM Re: 2 cycle lubrication [Re: Burt]
Silk Offline


Registered: 07/26/03
Posts: 4567
Loc: New Zealand
There is also not much going through in a modern 2 stroke - my scooter has a cat. I'm currently on 1600km on a litre of oil, I calculated nearly 2000km to a litre, so still an unkown own at this stage.
_________________________
1987 BMW R65 - Penrite V Twin 20/50
2005 Nissan Expert - Gulf Western 10W-40
1996 Volvo T5 - Penrite HPR15 - 15W-60. Ryco syntec filter.

Top
#4783527 - 06/11/18 02:12 AM Re: 2 cycle lubrication [Re: Silk]
Garak Offline


Registered: 12/05/09
Posts: 24620
Loc: Regina, Saskatchewan, Canada
That's pretty amazing. That shows you how old my last two stroke was. wink
_________________________
Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, NAPA Gold 7356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515

Top
#4783617 - 06/11/18 08:01 AM Re: 2 cycle lubrication [Re: Burt]
Happy Birthday racin4ds Offline


Registered: 05/07/10
Posts: 984
Loc: Ocala, Florida
Doesn't this make the flashpoint of the 2T oil very important depending on the use of the engine? i.e. high revving race engines need higher flashpoints and low revving OPE low flashpoints?
_________________________
Just say NO to thin oils and M1!
05 F350 Powerstroke
05 Hyundai Tucson
08 Legacy GT
2008 Kawasaki Ninja 650R

Top
#4783658 - 06/11/18 08:59 AM Re: 2 cycle lubrication [Re: Burt]
ARCOgraphite Offline


Registered: 05/17/09
Posts: 11972
Loc: N.H, U.S.A.
Its much worse now with alcohol in the fuel; acids and Ethanol make polyethylene precursors, can this happen in the engine? I say maybe given my filters plugging up the past decade.


Edited by ARCOgraphite (06/11/18 09:02 AM)
_________________________
2014 Nissan Rogue S CVT, OC#9 41392mi-QSUD10W30 + M110A CHAMP Filter; 2017 Subaru Crosstrek CVT OC#2 ?? mi-SOA/Idemitsu 0w20 + SOA Filter

Top
#4783690 - 06/11/18 09:43 AM Re: 2 cycle lubrication [Re: ARCOgraphite]
kschachn Offline


Registered: 12/26/05
Posts: 9421
Loc: Upper Midwest
Originally Posted By: ARCOgraphite
Its much worse now with alcohol in the fuel; acids and Ethanol make polyethylene precursors, can this happen in the engine? I say maybe given my filters plugging up the past decade.

What? You say you think you're making a polymer and that's clogging up your filter?

If so, out of all the goofy things people attribute to EtOH in fuel that has to be the best one yet.
_________________________
1994 BMW 530i, 227K
1996 Honda Accord, 262K
1999 Toyota Sienna, 394K
2000 Toyota ECHO, 267K

Top
#4785029 - 06/12/18 04:21 PM Re: 2 cycle lubrication [Re: Burt]
boraticus Offline


Registered: 04/19/09
Posts: 2910
Loc: Canada
"A small amount of gasoline in the oil of a four cycle engine is a bad thing"

Is it really? By the time the engine is up to temperature, any gasoline in the fuel will have evaporated.

You'd be surprised how many OPE engine have had or will get gasoline into the crankcase without any signs of related issues other than false oil reading due to increased volume the fuel adds while the engine is cold.

Top
#4786794 - 06/14/18 03:57 PM Re: 2 cycle lubrication [Re: Burt]
Happy Birthday racin4ds Offline


Registered: 05/07/10
Posts: 984
Loc: Ocala, Florida
Originally Posted By: Burt
A small amount of gasoline in the oil of a four cycle engine is a bad thing, but some 2 cycle engines use mostly gasoline with a small amount of oil to provide adequate lubrication. I realize they are different systems but how do they get away with this? And of course no filtering other than in 2 cycles’ gas tank.


LOL it doesn't hurt anything! Back years ago when we ran racing Karts they used the flathead briggs and stratton engines (5hp variant) and with a 34mm Tillotson carb and running pure methanol, I'd get on average 4-6 oz of methanol in the crankcase after each track session on my limited modified engines! Keep in mind these little things only held 14 oz of oil and turned 8500rpms!!! They lasted quite awhile before needing a rebuild too. A little gas in the oil surely won't hurt a thing!
_________________________
Just say NO to thin oils and M1!
05 F350 Powerstroke
05 Hyundai Tucson
08 Legacy GT
2008 Kawasaki Ninja 650R

Top
#4786839 - 06/14/18 04:41 PM Re: 2 cycle lubrication [Re: racin4ds]
boraticus Offline


Registered: 04/19/09
Posts: 2910
Loc: Canada
I'm surprised you'd have that much fuel in the crankcase once the oil is up to temperature. From my experience and what I've read, the gas in the oil usually cooks off when the engine is run for a while. Especially in an air cooled engine.

I agree, though that a bit of fuel in the oil is of very little consequence.

Top