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: MasonvilleEngines on May 03, 2020, 04:44:48 pm

Title: Re: Maybe a stiffer intake spring? Slo motion as a dianostic tool?
Post by: MasonvilleEngines on May 13, 2020, 07:34:02 am

Lol, collectors disease. I agree, Doug's  is similar...
https://youtu.be/lWnG8MuxOWc
But this one is a much closer a match...
https://youtu.be/S1BiXWvJV6E

Title: Re: Maybe a stiffer intake spring? Slo motion as a dianostic tool?
Post by: crazydoug on May 11, 2020, 06:58:56 am

I have a vertical and a horiz 1" bore that i bought from you. My horiz is very similar.

Title: Re: Maybe a stiffer intake spring? Slo motion as a dianostic tool?
Post by: MasonvilleEngines on May 09, 2020, 09:02:21 am

Doug,
 Do you have this model? It is a inch bore with a steel frame. I only saw a batch of 3 three made like this, Herb had a neighbor weld them up. None of the six you got from me is an exact match. Wondering if you mean familiar in as "Its a Herb" (Yes ) or if you have one of the other two?


Len.

Title: Re: Maybe a stiffer intake spring? Slo motion as a dianostic tool?
Post by: crazydoug on May 09, 2020, 07:09:21 am

Hmm.....That looks like a very familiar engine!! Glad to see you got it sorted out!
crazydoug

Title: Re: Maybe a stiffer intake spring? Slo motion as a dianostic tool?
Post by: MasonvilleEngines on May 09, 2020, 07:02:43 am

Yes. Restricting air intake with finger showed better running. Used a drilled out a set screw make adjustment. I was able to it lean it down quite a bit afterwards.   

Len.

Title: Re: Maybe a stiffer intake spring? Slo motion as a dianostic tool?
Post by: yozhek on May 09, 2020, 12:02:25 am

That looks better Len, was it the carb bore you reduced from 1/4 to 1/8?

Ade

Title: Re: Maybe a stiffer intake spring? Slo motion as a dianostic tool?
Post by: MasonvilleEngines on May 07, 2020, 05:47:22 pm

Stiffer spring seems to be an improvement, also reduced 1/4 needle valve air inlet to 1/8 inch. Now seems to get a positive report on each snort.

Len.

https://youtu.be/Xn-3q6JXkWA

Title: Re: Maybe a stiffer intake spring? Slo motion as a dianostic tool?
Post by: MasonvilleEngines on May 05, 2020, 02:27:29 pm

Hi All,
 Thanks for looking and feedback. Yes I think exhaust timing could be involved also. Still I am thinking a little more tension on intake spring as it is light to touch.


Len.

Title: Re: Maybe a stiffer intake spring? Slo motion as a dianostic tool?
Post by: 70Rcode on May 05, 2020, 01:43:03 pm

Hi Len,....Amazing how slo-mo reveals so much event detail !....Looks like the exhaust valve Latched-out lift could be increased to near peak camshaft lift to reduce miss cycle cylinder vacuum to eliminate or reduce the observed intake valve off-seat "wiggle" during the miss cycles without disturbing the current intake valve spring pressure...Regards, ...tom.

Title: Re: Maybe a stiffer intake spring? Slo motion as a dianostic tool?
Post by: yozhek on May 04, 2020, 12:24:35 am

Hi Len,

That is really interesting, like you say amazing how much one can see like that, inc the intake valve  ;)

Kind regards
Ade

Title: Maybe a stiffer intake spring? Slo motion as a dianostic tool?
Post by: MasonvilleEngines on May 03, 2020, 04:44:48 pm

Hi all,
 With a new phone I have been experimenting with slo-motion feature. Interesting what you can discern a little easier when things are slowed down. Including a stubborn globule of oil!

Len.

https://youtu.be/x1RK_oRWIto