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Re: Interesting oil mix v EGT test
Posted: Fri Jan 30, 2009 4:57 pm
by shocky
my vespa uses about 1.25% the dragster about the same
Re: Interesting oil mix v EGT test
Posted: Fri Jan 30, 2009 5:13 pm
by jonny snatchsniffer
my parma instuctions tell me to use 3% instead of 2%, but havent we been here before with piston ported/reed needing a higher ratio than a rotary vespa due to the mixture going directly onto the big end, but on a piston ported/reed some of the mixture goes up the transfers and some to the big end.
anyone got any plans to lc an rb yet to see if that will reduce wear due to heat ? then maybe if it works wonders the kits could be made even more expensive and actually be cast with jackets and heads
Re: Interesting oil mix v EGT test
Posted: Fri Jan 30, 2009 5:27 pm
by shocky
na jonny thats a bad idea reliability = lost sale of spares and rebuilds why would a dealer want to make his product bullet proof
Re: Interesting oil mix v EGT test
Posted: Fri Jan 30, 2009 5:29 pm
by coaster
I read in MCN the other week that the 2 stroke could be set to make a comeback using direct injection with and oil ratio of around 200:1.
No details as to how that would be achieved though
Re: Interesting oil mix v EGT test
Posted: Fri Jan 30, 2009 9:28 pm
by gnasher
I think it would be injecting fuel straight in to the combustion area after the exhaust port has shut. Keeps things clean and means the petrol wont wash off all the oil that is lubricating the big end and piston as only air will go through the crankcase area mixed with a very small amount of oil. As it wont get washed off it means you wont need as much going in. Read somewhere that mercury do something like this on 2T boat engines.
Re: Interesting oil mix v EGT test
Posted: Fri Jan 30, 2009 11:22 pm
by J1MS
rossi46 wrote:Hi All,
Have just completed a test on my RB using various oil mixes v EGT, bit dangerous but I needed to know
this is what I did :
Test Equipment
AIM MyChron4
http://www.aim-sportline.com/pages/kart ... chron4.htm and a back up from a world touring car both calibrate to +/- 1 degree C, fitted 150mm from the exhaust port as instructed by AIM.
Engine dynoed by Al at Diablo
1 mile stretch of road, full throttle, plug chop at the end each run.
Test 1
4% mix Putoline MHX - Nice plug colour, chocolate brown EGT - 565 degrees C , engine pulls and perform well
Test 2
3% mix Putoline MHX - plug colour getting darker EGT - 525 degrees C , engine a little wooly and feeling rich
Test 3
2% mix Putoline MHX - plug colour very dark brown EGT - 498 degrees C , engine didn't rev out so well now feeling very rich.
I know the less oil you ran would richen the mixture and also run cooler but I wanted to try it as I was bored and very intrigued by this. I am not saying you should try it as it could possibly not lubricate the big end bearing very well, I am using an Alpha crank in mine and as above Putoline MHX which is fully synthetic competition oil, which maybe lubricates better than other oils
. If you have used it before you will see it like treeacle when you pour it
.
If you have any comments on this please let me know, I am intrigued to know what you think.
D
Gordon Jennings did some research along these lines back in the late 70's or early 80's using a Suzuki 250 single and a caster based oil, they found that the oil from the previous run took up to 30 mins running on the dyno to remove all traces of each test oil, before starting the next run, they were testing the same oil but at differing ratios,their aim was to find the most efficient ratio (Produce the most power) which they worked out on their test engine to be 16-1 If you Google this(Gordon Jennings) it should come up.
Re: Interesting oil mix v EGT test
Posted: Fri Jan 30, 2009 11:35 pm
by drunkmunkey6969
J1MS wrote:Gordon Jennings did some research along these lines back in the late 70's or early 80's using a Suzuki 250 single and a caster based oil, they found that the oil from the previous run took up to 30 mins running on the dyno to remove all traces of each test oil, before starting the next run, they were testing the same oil but at differing ratios,their aim was to find the most efficient ratio (Produce the most power) which they worked out on their test engine to be 16-1 If you Google this(Gordon Jennings) it should come up.
16-1....thats 6.25% ??
Interesting, but i shouldnt think thats a good idea for a Lambo on modern fully synthetic oils.
Re: Interesting oil mix v EGT test
Posted: Fri Jan 30, 2009 11:37 pm
by drunkmunkey6969
Re: Interesting oil mix v EGT test
Posted: Fri Jan 30, 2009 11:49 pm
by J1MS
16-1....thats 6.25% ??
Interesting, but i shouldnt think thats a good idea for a Lambo on modern fully synthetic oils.
[/quote]
I think you will find it very relevent as its an air cooled barrel like Lambrettas and a PE 250 piston and Castor based oils still offer some of the best protection for 2 Strokes Plus Gordon Jennings was educating Suzuki back then, and I for one still run one of my scoots on a PE250 piston!
Re: Interesting oil mix v EGT test
Posted: Fri Jan 30, 2009 11:58 pm
by drunkmunkey6969
J1MS wrote:16-1....thats 6.25% ??
Interesting, but i shouldnt think thats a good idea for a Lambo on modern fully synthetic oils.
I think you will find it very relevent as its an air cooled barrel like Lambrettas and a PE 250 piston and Castor based oils still offer some of the best protection for 2 Strokes Plus Gordon Jennings was educating Suzuki back then, and I for one still run one of my scoots on a PE250 piston![/quote]
Note..i didnt say it wasnt relevant...i said it wasnt agood idea for a modern fully synthetic oil to run at 6.25%
So what % oil mix are you running?
