Oxygenated fuel in saws do’ And don’ts

[Deets066]

I always wanted to do porting on a banshee! Then have someone else drive it! Lol

The big bore cylinder kits they have for em are just crazy. Can get a 521cc setup and easily get up around 100hp

 

[srcarr52]

I tried VP M5 in some saws. It made good power but was hard to get rich enough to not run away. Some 20% nitro RC fuel was a fun experiment as well.

M5 in our alky carts was worth 10% hp. Knocked 5/10’s off a an 8s lap time but you could totally hear and see the different. Much sharper exhaust note, header glowing!

Nothing like a Honda 6.5 clone putting out upper 20’s hp.

 

[Deets066]

That looks like a good time.

I put some MR12 in my Banshee, brought her right to life

I took it to my basement for some minor fixes. Big mistake, whole damn house smells like race fuel

 

[srcarr52]

I took it to my basement for some minor fixes. Big mistake, whole damn house smells like race fuel

Similar thing. I spilt some T4 in the garage and it made my wife sick in the house.

 

[Deets066]

Similar thing. I spilt some T4 in the garage and it made my wife sick in the house.

Crazy how strong smelling it is. Gunna need to run it dry or drain it. Cuz the only place I can go with it is my garage now, which is attached

 

[ADMO services]

Crazy how strong smelling it is. Gunna need to run it dry or drain it. Cuz the only place I can go with it is my garage now, which is attached

Running it dry and as you mentioned earlier a flush fuel. If you were jetted for something much more oxygenated. What would you use as a flushing procedure. And type fuel??? Great points are being brought up here guys. I’m really impressed!

 

[ADMO services]

Aside from pulling the spark plug and pouring sea foam in the tank then choke it and pull the rope a few times.

 

[Deets066]

Running it dry and as you mentioned earlier a flush fuel. If you were jetted for something much more oxygenated. What would you use as a flushing procedure. And type fuel??? Great points are being brought up here guys. I’m really impressed!

You just run regular mix, it just runs fat as hell.

 

[ADMO services]

Ok that’s easy enough!

 

[Deets066]

You just run regular mix, it just runs fat as hell.

Runs way fat when setup for alky
Just oxygenated race gas isn’t that far off

 

[ADMO services]

I could definitely see that. On my little race 25 merc and tohatsus running methanols they would just stall out when I would try to purge with av gas they were so rich but only one carb on those made it easy to just slap new kits in em. They were both running 200psi compression which required some serious octane

 

[ADMO services]

It’s cool that saws require much less octane at that pressure. But totally different animal!

 

[Deets066]

It’s cool that saws require much less octane at that pressure. But totally different animal!

Yup, can run 220 psi on 87 pump gas

 

[ADMO services]

Wish larger displacement engines with lower rpm loads could do that!

 

[srcarr52]

Wish larger displacement engines with lower rpm loads could do that!

It's all about squish velocity. Make the squish bands narrow and with more clearance and it would run fine.

 

[ADMO services]

Oooo gotta respectfully disagree with that. My apologies

 

[ADMO services]

What you’re saying is true but you would have to have the perfect bore to stroke ratio to achieve that without running out of compression. And in modifying engines it’s just not that easy to change bore sizes to accommodate

 

[ADMO services]

And in 4 strokes it’s achievable with cam profiles as well as variable cam timing. But if I make my squish band narrowed and add more clearances I would have to make my combustion chamber smaller to keep the compression up and a combustion chamber undersized will detonate as well

 

[Stihlbro]

How do you make a 25 merc run on methanol?

 

[ADMO services]

With proper jetting. But that alone won’t yield much of a gain