Interesting oil mix v EGT test

[shocky]

What % was used when it was dyno'd? I'd assume 4% as the carb seemed to be spot on, but what would those figures be if you had it set up on the dyno if you were using 2%? As carb now running rich at 2% surely Al would have rejetted it?

dont know mate not been back to Al's yet but soon as I get chance I want to do a session with him doing the same thing on the dyno to see the jetting differences and power and torque commparisons, I am a bit geeky like this it comes with the nature of my job

Take for instance, autolube systems on something like RD350 LC or the similar I used to have one back in the day, and it never used as much oil as a Lammy due to the fine tuning of the oil / mixture control, maybe I am wrong but does the vespa use autolube ? has anyone checked to see how much oil they use compared to an RB or TS or any tuned lammy.

Opening a can of worms here me thinks

my vespa uses about 1.25% the dragster about the same

[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

[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

[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

[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.

[J1MS]

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.

[drunkmunkey6969]

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.

[drunkmunkey6969]

Here's the article: http://edj.net/2stroke/jennings/oilpremix.pdf

[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!

[drunkmunkey6969]

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?