Octane and oil ratio for 220lbs compression

[tunnelmike]

What do I need to run to be safe ? Thanks for the input. Mike

[Chaz]

Safe ... or a comparable unleaded if you're worried about the gators

https://www.sunocoracefuels.com/fuel/supreme

Lotz of different opinions on oil ...

Hard to go wrong with this ...

https://klotzlube.com/shop?olsPage=p...niplate&page=3

[tunnelmike]

Thanks Chaz I'm a Klotz fan. But what ratio at that compression ? Looking to turn 10k and I'm more concerned about the motor living than the welfare of our gator population ! Lol. So 112 octane minimum?

[patchesII]

You could run a 110 also. 112 is just a little easier to find. I’m a fan of heavier oil ratios, 24/1 is good. Wouldn’t run any leaner than 32/1. Klotz R50 is good as is the Techniplate

[Markus]

I'm more concerned about the motor living than the welfare of our gator population !

I don’t know if there have been any scientific studies on the impact of leaded fuel on the brains of alligators.

There is, however, ample evidence of brain damage on humans.

So for your own sake, use an unleaded fuel.

[Merc 2.5]

I'm glad this came up. Was wanting info in goin from 140ish to 200ish range. Just for a run or 2 but swap back and forth. I can use 6 gal portable tank for race fuel. Say I'm turnin 7k rpm max with medium load , I bump to 200lbs comp. I know I'll mix my oil richer , Do I need drop prop size and turn it higher?? Do I need install bigger jets? Timin will not b cranked high sorry for rookie question but need accurate info just all the ins and outs. thanks

[Capt.Insane-o]

I don’t know if there have been any scientific studies on the impact of leaded fuel on the brains of alligators.

There is, however, ample evidence of brain damage on humans.

So for your own sake, use an unleaded fuel.

Greta thanks you.

[Mrzip]

@ Least 112

[tunnelmike]

Eric , I can get the Techniplate from Simon by the gallon of its ok to use. Going to be 660 to 800' passes. I've never run this much compression and figured a tad more oil getting hopefully 10k plus

Merc , I would step up the jets and read the plugs to fine tune it if it were me.

[Chaz]

Greta thanks you.

I spent every Wednesday, Thursday, Friday and Saturday at the drags since I was 15 and I'm no where near as dain bramaged as the Commie-left has inflicted on that poor misguided hate-filled child.

Mrzip

@ Least 112

Zippy, I ran VP C-23 in my nitrous motors. But those were seven hundred cubic inch's with two pretty healthy guns . I think you can go too far trying to be safe and actually hurt power. As well as the possibility of hurting the rings on a two stroke by exposing the face to the heat of a still burning charge by using a slow reacting fuel. Too much of a good thing ... maybe.

[Motv18]

Merc 2.5, you would also need to drain the carbs and reprime, just to be sure not to fire it up on low octane.

Rpm pretty much determines ratios more oil for mor rpm. Compression would only matter when in diesel psi territory at which point you could run oil only almost. Though not often talked about oil has a octane rated good luck finding it though. (So you can run total octane formulas)

32:1 is my choice I don’t have numbers saying 40/32/24 is better, but I prefer as much fuel as possible.

One thing would be not makeing your own. Like what you see on hot rod forums. A few years ago v-grade (84aki 9something rvp) became the basic stock for pump gas. Throwing off all the ratios of toluene and xylene based on m-grade.

[patchesII]

Eric , I can get the Techniplate from Simon by the gallon of its ok to use. Going to be 660 to 800' passes. I've never run this much compression and figured a tad more oil getting hopefully 10k plus

Merc , I would step up the jets and read the plugs to fine tune it if it were me.

My preference would be the R50

[patchesII]

Merc 2.5, you would also need to drain the carbs and reprime, just to be sure not to fire it up on low octane.

Rpm pretty much determines ratios more oil for mor rpm. Compression would only matter when in diesel psi territory at which point you could run oil only almost. Though not often talked about oil has a octane rated good luck finding it though. (So you can run total octane formulas)

32:1 is my choice I don’t have numbers saying 40/32/24 is better, but I prefer as much fuel as possible.

One thing would be not makeing your own. Like what you see on hot rod forums. A few years ago v-grade (84aki 9something rvp) became the basic stock for pump gas. Throwing off all the ratios of toluene and xylene based on m-grade.

Firing an engine on pump gas still in the carbs won’t hurt a thing. There’s no load on the engine and no timing. Unless you crank it with your foot on the floor, in gear, you’ll be fine.

There’s more to making power than just the obvious of having more fuel. I’ve ran and gathered data on oil ratios from 32/1 to 18/1.

[Chaz]

There’s more to making power than just the obvious of having more fuel. I’ve ran and gathered data on oil ratios from 32/1 to 18/1.

What ... you never ran any of this @ 100 ta 1 in your dirtbike when you was a kid ..

https://www.belray.com/product/mc-1-...2t-engine-oil/

[patchesII]

I don’t even remember what I ran in my dirt bike 25 years ago. My memory isn’t what it used to be. Lol