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Old 06-14-2019, 12:25 PM   #29
Nick S

 
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Originally Posted by Katech_Zach View Post
Small update, the block has been clearanced for the 4" stroke. I will begin assembling the heads today. I made an update to the rotating assembly, so I am now waiting on a different set of rods and a crank. I chose to go with a crank and rod combination that utilized a 2.000" rod journal instead of the standard 2.100".


Can I ask the reason why you decided to go with a smaller than standard journal bearing diameter? Just trying to learn why the decisions were made.

Thanks.
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Old 06-14-2019, 10:02 PM   #30
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Zach, did you make any headway on the LSR bumpsteer kit?
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Old 06-14-2019, 10:27 PM   #31
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Interested in who's piston squirters you are using.
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Old Today, 03:47 PM   #32
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Quote:
Originally Posted by Nick S View Post
Can I ask the reason why you decided to go with a smaller than standard journal bearing diameter? Just trying to learn why the decisions were made.

Thanks.
Nick, there are many pros and cons to different sized bearing journals. Without getting extremely technical, the reason why I chose a slightly smaller one for my personal project is the following:

1) Decreased bearing surface speed relative to RPM.
2) Less mass

Mass change is negligible. It may be a difference of 1.5lbs.
The decreased surface speed and friction is the more desired characteristic.

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Originally Posted by cdb95z28 View Post
Zach, did you make any headway on the LSR bumpsteer kit?
I have the pieces close to being done, I have not had the time to tap them. I recreated the body using 4340 instead of 6061 aluminum. All I have to do is tap them followed by powdercoating. I will post more on this when they are finished.

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Interested in who's piston squirters you are using.
I will be using our Katech Piston Squirter designed for 4" strokes. The OEM LS9 squirters will not clear a 4" stroke.

https://store.katechengines.com/kate...irter-p74.aspx
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Old Today, 05:36 PM   #33
Nick S

 
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Quote:
Originally Posted by Katech_Zach View Post
Nick, there are many pros and cons to different sized bearing journals. Without getting extremely technical, the reason why I chose a slightly smaller one for my personal project is the following:

1) Decreased bearing surface speed relative to RPM.
2) Less mass

Mass change is negligible. It may be a difference of 1.5lbs.
The decreased surface speed and friction is the more desired characteristic.



I have the pieces close to being done, I have not had the time to tap them. I recreated the body using 4340 instead of 6061 aluminum. All I have to do is tap them followed by powdercoating. I will post more on this when they are finished.



I will be using our Katech Piston Squirter designed for 4" strokes. The OEM LS9 squirters will not clear a 4" stroke.

https://store.katechengines.com/kate...irter-p74.aspx
Hi Zach,
Ok the decreased bearing surface velocity makes sense. Initially I was just thinking that smaller diameter journals would mean less shear strength due to a smaller cross sectional area. But I can definitely understand the bearing surface speed if you are looking to get more RPMs out of the engine.

Thanks for sharing your thought process and reasoning. It definitely helps to understand all the factors going into the build!
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Old Today, 07:34 PM   #34
Katech_Zach

 
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Quote:
Originally Posted by Nick S View Post
Hi Zach,
Ok the decreased bearing surface velocity makes sense. Initially I was just thinking that smaller diameter journals would mean less shear strength due to a smaller cross sectional area. But I can definitely understand the bearing surface speed if you are looking to get more RPMs out of the engine.

Thanks for sharing your thought process and reasoning. It definitely helps to understand all the factors going into the build!
This is true, the crankshaft is "weaker" as far as sheer strength goes when comparing the same crank with and without a smaller diameter rod journal. For the power levels that I am targeting, I will not have to worry.
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