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  • Nitro Hotsaw
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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

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