Hot, hot, hot!

[stihlmadasever]

Is this your ms 230 again,jeez id bin that pos and get a different saw.

Oh and exhausts do get very very hot...so dont be tempted to lick it..

[bmp01]

So is this the MS230, that wouldn't run. ..the one where carb had been visited by "Bodger's Inc" in a former life?

 

If i were you I'd do some searching on how to tune a carb before you do much more with it, there is a real chance of damage if its running lean (and therefore hot). There are some good You Tube videos on the subject, you need the soundtrack as tuning is done by ear (or with a tacho if you have access to one).

 

bmp01

[bmp01]

Is this your ms 230 again,jeez id bin that pos and get a different saw.

 

 

You not planning a life in politics then ???

[Stubby]

Where would the air leak be coming from? And how do i tell if its over-revving?

 

Thanks

 

 

Sent from my iPhone using Arbtalk

 

An air leak could come from a split fuel hose or shot crank seals or a split carb boot etc etc . If it has one it will run lean which , will make it over rev and run hot and possibly eventually lean seize . You can check the RPM with a tacho . Obviously you need to know what the top limit RPM is supposed to be . .

[openspaceman]

So is this the MS230, that wouldn't run. ..the one where carb had been visited by "Bodger's Inc" in a former life?

 

If i were you I'd do some searching on how to tune a carb before you do much more with it, there is a real chance of damage if its running lean (and therefore hot). There are some good You Tube videos on the subject, you need the soundtrack as tuning is done by ear (or with a tacho if you have access to one).

 

bmp01

 

Running weak causes more heat to be rejected into the cylinder, it doesn't affect the temperature of the exhaust gas which is maximised at full chat with over 500C at stoichiometric fuel:air ratio.

[bmp01]

Running weak causes more heat to be rejected into the cylinder, it doesn't affect the temperature of the exhaust gas which is maximised at full chat with over 500C at stoichiometric fuel:air ratio.

 

Emmm....not sure about that.

On a 4 stroke (what i know best) running lean definitely causes ext temp to go skyward. As you go lean, combustion slows down. Slow combustion means you get less energy converted into mechanical energy - imagine the extreme case where the bulk of combustion is taking place as the piston is way past tdc and travelling down the cylinder, you just dont get the cylinder pressure at the right time to do any good. And if you don't remove the energy from the gases they stay hot - so higher exhaust temps. Pistons and exhaust valves also get toasted.

It's got to be the same with a two stroke. Plus, and maybe more importantly the higher engine speed you get with a lean engine means 1) more combustion cycles so even if every thing else were equal that's more heat to get rid of and 2) combustion takes a finite time so at some point the engine is reving too fast for the engine to be efficient (just like the running lean logic above)... and that's more heat out the exhaust.

 

Conversely a bit of extra fuel - running rich - the extra mass of the fuel absorbs some of the combustion heat causing cooler combustion and a cooler engine.

 

I know which I'd rather have.

 

bmp01

[spudulike]

Can we have a whip round to get this fella a new saw and give this one a burial as it is taking over the whole site:001_rolleyes:

[billpierce]

Can we have a whip round to get this fella a new saw and give this one a burial as it is taking over the whole site:001_rolleyes:

Lol, maybe we could all send our scrappers to you and you could run a saw bank for the needy

 

Sent from my C6603 using Arbtalk mobile app

[stihlmadasever]

 

You not planning a life in politics then ???

 

And heres me thinkin i was pretty tactful with that one

[TimberCutterDartmoor]

Running weak causes more heat to be rejected into the cylinder, it doesn't affect the temperature of the exhaust gas which is maximised at full chat with over 500C at stoichiometric fuel:air ratio.

 

Not a lot of sense there.