This 066 Grenaded........What The Hell Happened???????

[belgian]

Hey Randy, I didn't read all 18 pages of this thread but was wondering why the inside muffler pic was telling you something about what happened. Was it the colour ?
Maybe you mentioned it already, just didn't notice it. thanks

 

[blsnelling]

I think Brad proved a point. Two top ends and a crank on his BIL's......on his nothing was needed...

That was over a 20 year period. He had absolutely no trouble at all from his mix. Banshees are know to be topend eaters. His was not. I'm not trying to be argumentative here. I would NEVER recommend what's he's done. But, it does make for an interesting aside.

To your point though, I never had to replace my crank. I did have to replace one of the main bearings, but not due to wear. The outer race cracked and was found during a tear down for an unrelated issue. I also did the topends twice on mine as well. This is general maintenance on these machines.

I apologize that I did not make that clear.

BTW, I agree 100% with your recommendations.

 

[Eccentric]

so if my thinking caps on strait ,in theory if my 660 is harder to pull over than the 044 ,the 660 would have more of a chance of detonation having the larger bore ? maybe why my 250cc atv had to have race fuel to not ping ? all 3 engines with around 200 psi

Cylinder diameter, combustion chamber shape/size, and their affect on detonation is above my pay grade. Eagerly waiting for an answer to that question. My '83 CR250R and '86 TRX250R both pinged on 87 and 89 octane pump gas...............and they were both stock, with only the exhaust systems and reeds changed. Come to think of it my '90 ATK 406CC did too (and it was bone stock)....opcorn:

 

[Mastermind]

Hey Randy, I didn't read all 18 pages of this thread but was wondering why the inside muffler pic was telling you something about what happened. Was it the colour ?
Maybe you mentioned it already, just didn't notice it. thanks

The lack of any oil at all.

so if my thinking caps on strait ,in theory if my 660 is harder to pull over than the 044 ,the 660 would have more of a chance of detonation having the larger bore ? maybe why my 250cc atv had to have race fuel to not ping ? all 3 engines with around 200 psi

Combustion chamber shape, and volume.....along with squish band width, squish clearance, and squish velocity all play a role in detonation control. Stroke does too, a longer stroke creates a longer dwell time, that in itself can play a role in whether an engine will detonate or not.

In cause you are wondering where I'm coming up with this stuff........try sitting down for a few hours and reading the latest and greatest from the ultra high horsepower turbo engine designers. Of course they refer to the squish area as the quench area.

 

[Mastermind]

Hey Randy, I didn't read all 18 pages of this thread but was wondering why the inside muffler pic was telling you something about what happened. Was it the colour ?
Maybe you mentioned it already, just didn't notice it. thanks

The lack of any oil at all.

so if my thinking caps on strait ,in theory if my 660 is harder to pull over than the 044 ,the 660 would have more of a chance of detonation having the larger bore ? maybe why my 250cc atv had to have race fuel to not ping ? all 3 engines with around 200 psi

Combustion chamber shape, and volume.....along with squish band width, squish clearance, and squish velocity all play a role in detonation control. Stroke does too, a longer stroke creates a longer dwell time, that in itself can play a role in whether an engine will detonate or not.

In cause you are wondering where I'm coming up with this stuff........try sitting down for a few hours and reading the latest and greatest from the ultra high horsepower turbo engine designers. Of course they refer to the squish area as the quench area.

 

[blsnelling]

I also want to make this clear. I don't think for one second that my modified Banshee would have lasted any time at all at 100:1.

Again, like Randy pointed out, mine had no catastrophic failures at all related to the oil/mix, even though putting out a LOT more power. While his quad crank lasted an amazing 20 years at 100:1, it probably wouldn't have needed replaced at all had he been running 32:1. Just like most stock saws will live a long life at 50:1 it could live longer at 32:1, and even more so on a modified saw. If nothing else, think of it as cheap insurance. It can't hurt and will most likely help.

 

[DexterDay]

That was over a 20 year period. He had absolutely no trouble at all from his mix. Banshees are know to be topend eaters. His was not. I'm not trying to be argumentative here. I would NEVER recommend what's he's done. But, it does make for an interesting aside.

To your point though, I never had to replace my crank. I did have to replace one of the main bearings, but not due to wear. The outer race cracked and was found during a tear down for an unrelated issue. I also did the topends twice on mine as well. This is general maintenance on these machines.

I apologize that I did not make that clear.

BTW, I agree 100% with your recommendations.

I was just PMing Big D about what oil I used (he just received a saw I sold him) and since I had my Banshee, I have ran 40:1 Castor 927 in everything. Rebuilt my top end as well (pistons and rings) but it was just general maintenance as well.

Castor 927 is the best smelling 2 cycle oil out there.

 

[blsnelling]

Nothing better than race gas and 927 in a screaming side-by-side twin cylinder Banshee. That's 100% my obsession with the Solo Twin Love that sound!

Sorry, just a bit off topic.

 

[Trx250r180]

would not be a Mastermind thread without a thread derail

 

[komatsuvarna]

Only thing I didn't like about 927 was ya couldn't hardly tell if the gas was mixed or not.

I may run it again sometime....

 

[Eccentric]

Only thing I didn't like about 927 was ya couldn't hardly tell if the gas was mixed or not.

I may run it again sometime....

There are a few oils like that. Redline doesn't have as much dye as I'd like to see in an oil. The best oil I've seen for that is the WoodlandPro synthetic. It turns the fuel BLUE.

 

[DexterDay]

Nothing better than race gas and 927 in a screaming side-by-side twin cylinder Banshee. That's 100% my obsession with the Solo Twin Love that sound!

Sorry, just a bit off topic.

With 110, it's the best smell in the world (well, one of them)

And as for the quad.. Awesome machines. Loved mine. Only have 4 stokes now (440ex/300ex/400 Big Bear for work).

Still want a Quadzilla 500 (Suzuki). One day I will restore one.

 

[exSW]

Stroke does too, a longer stroke creates a longer dwell time, that in itself can play a role in whether an engine will detonate or not.

Elaborate please.Longer dwell do to longer stroke leads to detonation?

 

[mdavlee]

The Torco is just added insurance. Is it really needed? I'm not so sure.

I started using that when we had some trouble with an overly hot 395XP. It was later determined that the saw's trouble was from a fuel line that was routed incorrectly. I've stopped using Torco in the last month to see how the saws fair......the cooler weather is a good time to try something new. So far, I can't tell any difference......but I've not done a huge amount of cutting either.

I didn't use any fuel additives this summer and fall when I burnt at least 10 gallons on the stuff I cut. It was split between the 395 and 288 with the machine work done having plenty of 87 run through it.

 

[Mastermind]

Mike you remember when we were chasing a gremlin in Roll Tide's 395?

We started thinking low octane may be the problem. We found the problem, and it had nothing to do with fuel quality....

That's when I started using Torco. I've really started thinking I wasted my money on it.

 

[sgrizz]

Nothing better than race gas and 927 in a screaming side-by-side twin cylinder Banshee. That's 100% my obsession with the Solo Twin Love that sound!

Sorry, just a bit off topic.

I had a 2001 banshee and ran 927 32:1 with vp race gas and smelled like cotton candy .

 

[Trx250r180]

leaded trick fuel with the 927

 

[bayard]

this was a great thread.this is why we are here. i thank all of you for posting .k

 

[mdavlee]

Mike you remember when we were chasing a gremlin in Roll Tide's 395?

We started thinking low octane may be the problem. We found the problem, and it had nothing to do with fuel quality....

That's when I started using Torco. I've really started thinking I wasted my money on it.

I remember the thing wouldn't run right and he was trying 10 different fuels in it. I have some octane booster but haven't used it since last winter when I cut with you guys down there. It's sitting on the shelf and I might be able to find it. 927 is another good oil that I didn't have any problems with build up or bad smells.

 

[treesmith]

I love listening, reading and learning so thanks Randy and all the others here. The amount of useful info and experience available here is great, you all make this place what it is so, thanks!

Sent from my GT-I9210T