Author Topic: things conn. rod  (Read 307 times)

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Offline 1manband

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things conn. rod
« on: August 08, 2015, 11:25:14 am »
....didn't want to clog up a good thread.

-had no measurements of a 460
-do have actual measurements of the jonsereds 52

working with those, hope to show effect of adding 3 mm to the length of the conn rod

stock rod = 41.23 mm
stock stroke = 32 mm

coon rod to stroke ratio:
= 41.23/32 = 1.29

+3mm conn rod to stroke ratio:
= 44.23/32 = 1.38

ratio difference = 0.9
yielding a 6.5% increase.

pics to follow....then a couple of overlay pics.

short vs. long

hiatus

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Offline 1manband

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Re: things conn. rod
« Reply #1 on: August 08, 2015, 11:27:07 am »
at about 97 ATDC exhaust just starting to open
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Offline 1manband

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Re: things conn. rod
« Reply #2 on: August 08, 2015, 11:28:18 am »
at BDC
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Offline 1manband

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Re: things conn. rod
« Reply #3 on: August 08, 2015, 11:29:55 am »
at about 263 degrees exhaust closed
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Offline 1manband

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Re: things conn. rod
« Reply #4 on: August 08, 2015, 11:32:00 am »
hard to tell the difference in graphs, no?

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Offline 1manband

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Re: things conn. rod
« Reply #5 on: August 08, 2015, 11:35:31 am »
now, taking a look at the infamous dwell

...this is at about 10 degrees BTDC.......the air/fuel mix is just starting to burn
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Offline 1manband

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Re: things conn. rod
« Reply #6 on: August 08, 2015, 11:37:42 am »
at 30 degrees ATDC

.....fuel mix is about 85-100% burned
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Offline 1manband

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Re: things conn. rod
« Reply #7 on: August 08, 2015, 11:41:18 am »
lastly........the overlay pics depicting dwell time accel

at 10 degrees BTDC

(darker line in background is stock rod)
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Offline 1manband

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Re: things conn. rod
« Reply #8 on: August 08, 2015, 11:43:48 am »
combined at 30 degrees ATDC

(darker lines in back are stock rod).

.....best i could do with overlapping the photos.  blow them up to see maybe?
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Offline 1manband

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Re: things conn. rod
« Reply #9 on: August 08, 2015, 12:01:40 pm »
.......true, there is a hair more dwell.

......there is something a bit more important than this.  unfortunately i don't have the ability to make this particular program graph the more important thing.

encourage you folks to develop your own conclusions.  numbers are numbers ......as far as dwell is concerned.
hiatus

 

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