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Author Topic: Maybe a stiffer intake spring? Slo motion as a dianostic tool?  (Read 3288 times)

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Maybe a stiffer intake spring? Slo motion as a dianostic tool?
« 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.






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Re: Maybe a stiffer intake spring? Slo motion as a dianostic tool?
« Reply #1 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
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Re: Maybe a stiffer intake spring? Slo motion as a dianostic tool?
« Reply #2 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.
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Re: Maybe a stiffer intake spring? Slo motion as a dianostic tool?
« Reply #3 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.

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Re: Maybe a stiffer intake spring? Slo motion as a dianostic tool?
« Reply #4 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.




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Re: Maybe a stiffer intake spring? Slo motion as a dianostic tool?
« Reply #5 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
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Re: Maybe a stiffer intake spring? Slo motion as a dianostic tool?
« Reply #6 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.
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Re: Maybe a stiffer intake spring? Slo motion as a dianostic tool?
« Reply #7 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
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Re: Maybe a stiffer intake spring? Slo motion as a dianostic tool?
« Reply #8 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.
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Re: Maybe a stiffer intake spring? Slo motion as a dianostic tool?
« Reply #9 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.
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Re: Maybe a stiffer intake spring? Slo motion as a dianostic tool?
« Reply #10 on: May 13, 2020, 07:34:02 am »
Lol, collectors disease. I agree, Doug's  is similar...

But this one is a much closer a match...

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