661 muffler mod progression w/thermocouple

[Redbull661]

Did this back on Dec 1st when it was still warm. Now that it's -22 and I don't want to go outside...

This is a completely stock 661 with 10 tanks on it. I am running 8pin 114dl RSK.

 

[Redbull661]

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[Stihl working Hard]

Did this back on Dec 1st when it was still warm. Now that it's -22 and I don't want to go outside...

This is a completely stock 661 with 10 tanks on it. I am running 8pin 114dl RSK.

I still haven't had time to find a good video editor yet. (youtube shut down their editor) So you'll have to just watch the individual clips. And only 5 vids per post on OPE so this will take up 2 or 3 posts.

Stock muffler -

Stock muffler but with the spark screen removed -

Stock muffler but with out spark screen and now baffle removed -

Great videos as usual @Redbull661 keep up the great work

 

[XP_Slinger]

Very cool @Redbull661 . Where did you have the thermocouple installed in the cylinder? Results don’t really show a huge temp reduction with the MM but it is lower nonetheless. very very interesting.

And that Saw looks strong, Nice.

 

[srcarr52]

It's a basic editor, not very many frills, but it gets the job done for cutting and splicing videos together.

https://windows-movie-maker.en.softonic.com/

 

[RI Chevy]

I wonder if it matters on where the muffler mod is done on the muffler? Does a hole in the front of the muffler get rid of heat more efficiently? Verses the side ports. Albeit the front hole would be a bit louder, but that is what ear plugs are for.
Cool tests as always Julian.

 

[Cigmaker]

Many thanks! Always enjoy these tests.

 

[tree monkey]

Very cool @Redbull661 . Where did you have the thermocouple installed in the cylinder? Results don’t really show a huge temp reduction with the MM. very very interesting.

And that Saw looks strong, Nice.

it's a washer under the sparkplug

 

[XP_Slinger]

it's a washer under the sparkplug

Thanks.

 

[EvilRoySlade]

@Redbull661 you should look into adhering an RTD to the muffler heat shield too. Lots of adhesives designed for that.

I’ll do some research of my own.

 

[Loanstar]

Very interesting test here. Curious tho.. Have you tried any similar test using different oil mix ratios or octane ratings?

 

[RI Chevy]

He has done all of that in the past. Julian is one of the best with extensive testing. You name it, he has probably done it.

 

[blsnelling]

EGT is where it's at.

 

[Loanstar]

EGT is where it's at.

100% right. Is there a link to his findings?

 

[Deets066]

100% right. Is there a link to his findings?

He hasn't posted any egt's that I know of

 

[94BULLITT]

So the saw did not get any faster with the baffle removed. I wonder if it would have picked up with the baffler in and the outlet enlarged.

 

[Khntr85]

Old thread, but did anyone find out if just leaving the baffle and enlarging the existing port is about the best you can do??

 

[tree monkey]

i remove the baffle and add 1 port for long bar and 2 ports for short bar