NSR250.net Forums Logo: Honda NSR 250 Forums, Classifieds and Service Manual in English. Covering All Honda NSR 250 MC16, MC18, MC21 and MC28 models
NSR250.net Forums

#
 
#
 
Performance Engineering

  • NSR250 Forums Index ‹ NSR250R Discussion
  • Members Content
  • Members Garage
  • Subscription
  • Transactions
  • FAQ
  • Search
  • Register
  • Log in

Pre-mix oil mixture


Reply to topic   printer-friendly view
Page 1 of 1   Download Topic





estrol

 
Posts: 12
Joined: 06 Aug 2005

Location: Asia
    Send private message View user's profile
    Reply with quote  

Pre-mix oil mixture

Mon Aug 08, 2005 5:19 pm » Post: #1 » Download Post

Learning that 50-1, 45-1 or 30-1 mix is good depending on the set-up. My question is abit silly but better than doing something wrong. When you say 50-1...Is that 50 liters gas to 1 liter of 2T oil. How about if the gas tank can only consume around 30 liters? how would I be able to mix say 10 liters of gas with how many ml of 2T for testing before jetting. A formula would be nice. I wasn't really good at math in college sorry Mr. Green
_________________
ride it like a horse
Back to top


cgallant
Site Admin
 
Posts: 1608
Joined: 18 Jan 2004

Location: Ocala, FL
2001 Honda RS250
    Send private message View user's profile Visit poster's website
    Reply with quote  

Mon Aug 08, 2005 5:36 pm » Post: #2 » Download Post

Estrol,

The premix ratio is X parts fuel to Y parts oil. You can figure that our by the ounce, or mililiter, or go get yourself a Ratio Rite mixing cup. Takes all the guessing work out of mixing.


Thanks,
_________________
Charles Gallant
Back to top


estrol

 
Posts: 12
Joined: 06 Aug 2005

Location: Asia
    Send private message View user's profile
    Reply with quote  

Mon Aug 08, 2005 5:43 pm » Post: #3 » Download Post

so how much 2T should be mixed with 10 liters??? Is there a basic mathematical formula for that? thanks
_________________
ride it like a horse
Back to top


cgallant
Site Admin
 
Posts: 1608
Joined: 18 Jan 2004

Location: Ocala, FL
2001 Honda RS250
    Send private message View user's profile Visit poster's website
    Reply with quote  

Mon Aug 08, 2005 6:14 pm » Post: #4 » Download Post

Estrol,

that all depends on the ratio you want to mix at.

Since I mix at 32:1 I would use approx 312 milliliters of oil for 10 liters of fuel.

I normally do 3 gallons of fuel at a time when racing. This means I would use approx 12 oz of oil for that much fuel.

Thanks,
_________________
Charles Gallant
Back to top


cgallant
Site Admin
 
Posts: 1608
Joined: 18 Jan 2004

Location: Ocala, FL
2001 Honda RS250
    Send private message View user's profile Visit poster's website
    Reply with quote  

Mon Aug 08, 2005 6:18 pm » Post: #5 » Download Post

For calculating your mix with liters... I would use this algorithm

Liters of Fuel divided by oil mix ratio * 1000

So for 10 liters mixed at 32:1

(10 / 32) * 1000 = 312.5

That will give you milliliters of oil needed, or .3125 liters of oil.

Thanks
_________________
Charles Gallant
Back to top


estrol

 
Posts: 12
Joined: 06 Aug 2005

Location: Asia
    Send private message View user's profile
    Reply with quote  

Mon Aug 08, 2005 6:42 pm » Post: #6 » Download Post

Copy that! I have printed it out in a large scale. Then added it to my notes folder. I came up with 45ml at 10L at 45-1 ratio. For a 32-1 mix you must have really done all the testing to come up with a perfect set-up. Thank you for the lesson on algorithm. Much appreciated Charles. Cool
_________________
ride it like a horse
Back to top


cgallant
Site Admin
 
Posts: 1608
Joined: 18 Jan 2004

Location: Ocala, FL
2001 Honda RS250
    Send private message View user's profile Visit poster's website
    Reply with quote  

Mon Aug 08, 2005 7:04 pm » Post: #7 » Download Post

going from 45:1 to 32:1 doesn't make much of a difference in jetting. Maybe at most 1 jet size in difference (and most likely not).

The main difference that using 45:1 and not 32:1 is a reduction in the amount of oil to lubricate the engine. I would rather jump a jet size up, run higher amounts of oil. I may be running richer, but I know I will have a well lubricated engine, making for a longer lasting engine.

On my 2001 Honda RS250 I run at 24:1 every time I do a top end, I am amazed at how good the parts look.

Thanks,
_________________
Charles Gallant
Back to top


Clarkie

 
Posts: 314
Joined: 22 Jan 2004

Location: Wiltshire UK
    Send private message View user's profile Send e-mail
    Reply with quote  

Tue Aug 09, 2005 9:16 pm » Post: #8 » Download Post

I always find it easier to just fix a quantity of oil per litre in your head. So 30ml, 40ml - whatever.[Depending on your ratio]
Than multiply that, by however many litres you put in. Easy!
_________________
Image Hosted by ImageShack.us
Back to top


Reply to topic   printer-friendly view
Page 1 of 1   Download Topic

NSR250R Discussion

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You cannot download files in this forum

  • NSR250 Forums Index
  • All times are GMT
Powered by phpBB © 2001, 2005 phpBB Group


Hosted by NSR250dotNET © 2008 NSR250dotNET