Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

The Regular Stuff: Chat, Buy, Sell, Off Topic, etc. => General Discussion - Scale Model Gas Engines - Hit & Miss - Throttle Governed - Non-Compression – etc => Topic started by: Belugawhaleman on March 24, 2020, 05:42:28 pm

Title: Re: M90 mixer question
Post by: 70Rcode on March 25, 2020, 05:53:14 pm

Yes, ..model plane engine users of similar size nitro engines claimed a slightly rotated (you could just barely see either hole) spraybar ran better...i might apply a little twist & see if i can get mine like yours...thx, .tom.

Title: Re: M90 mixer question
Post by: Belugawhaleman on March 25, 2020, 05:39:04 pm

Quote from: 70Rcode on March 25, 2020, 05:26:07 pm

Hmm...my spraybar has a venturi centered, 90° thru-hole pointing straight outward & inward ....maybe a production change ?

I just looked at my engine and the hole is turned slightly toward the front of the engine. I didn't know that the bars are
drilled clear through . That must be the case with mine.

Title: Re: M90 mixer question
Post by: 70Rcode on March 25, 2020, 05:26:07 pm

Hmm...my spraybar has a venturi centered, 90° thru-hole pointing straight outward & inward ....maybe a production change ?

Title: Re: M90 mixer question
Post by: Belugawhaleman on March 25, 2020, 12:48:41 pm

Quote from: 70Rcode on March 25, 2020, 12:11:47 pm

Hi Paul,... what's best non-destructive way to remove or rotate just the spraybar ?....there's always been lively discussions on spraybar # of holes & orientation direction for optimizing fuel atomization issues from way back i was flying Fox nitro airplane 35 & 36x motors.

Not sure. Frankly I wouldn't try it. The hole on my spray bar is facing towards one side instead of the interior of the mixer. However, my engine runs just fine so I won't mess with it. I wanted to know if my mixer was screwed in because it was loose and I wanted to use loctite to secure it. I ended up using rubberized ca adhesive. Incidentally, I just purchased some Tygon fuel tubing from McMaster-Carr as my fuel line doesn't seem to be holding up too well. The new fuel line is clear yellow.

Title: Re: M90 mixer question
Post by: 70Rcode on March 25, 2020, 12:11:47 pm

Hi Paul,... what's best non-destructive way to remove or rotate just the spraybar ?....there's always been lively discussions on spraybar # of holes & orientation direction for optimizing fuel atomization issues from way back i was flying Fox nitro airplane 35 & 36x motors.

Title: Re: M90 mixer question
Post by: Belugawhaleman on March 25, 2020, 09:41:06 am

Quote from: Dr.Rev.DelmarMacReady on March 25, 2020, 08:07:03 am

Threaded, at least mine are.

Thanks😂

Title: Re: M90 mixer question
Post by: Dr.Rev.DelmarMacReady on March 25, 2020, 08:07:03 am

Threaded, at least mine are.

Title: M90 mixer question
Post by: Belugawhaleman on March 24, 2020, 05:42:28 pm

Are the mixers or carbs on these engines screwed in or pressed in place ?