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PostPosted: Sun Oct 22, 2017 11:15 am 
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Joined: Mon Oct 29, 2012 2:49 pm
Posts: 470
Location: Orange County, NC
Those are great numbers. It just proves that I really dont know what I'm doing and what an under-acheiver my slug is.

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1969 mustang, 377C/powerglide
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PostPosted: Mon Oct 23, 2017 10:03 am 
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Joined: Mon Oct 23, 2017 9:53 am
Posts: 177
Hello Brent. After email chat the other day i signed up. Very impressive numbers to say the least. Im a die hard fan of the iron motor and the more we work with the iron headed motor of my daughters the more it impresses me. Your latest engine only amplified this interest in iron heads. Good Job.


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PostPosted: Mon Sep 03, 2018 1:38 am 
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Joined: Tue Nov 06, 2012 10:23 am
Posts: 934
Location: Texas
Brent, I just looked at this build again. I am puzzled though about the CID of this motor. You said its a 354cid but it has a stock stroke crank of 3.5 inches but you have Molnar 6.400" connecting rods in it. Mine is 4.040 bore with a stock crank 3.5 inches but have the Eagle 5.78 H beam rods and my cubes are 359. How do you have a smaller engine with longer rods?
-Matt


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PostPosted: Mon Sep 03, 2018 6:09 am 
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Joined: Mon Oct 29, 2012 9:05 am
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Bore and stroke determine the displacement of an engine. You are measuring the volume of a cylinder and then multiplying it by 8 cylinders. I think this one was a 4.015" x 3.500".

(4.015"/2)^2 * 8 * PI * 3.5 = 354.5 ci.

(4.040"/2)^2 * 8 * PI * 3.5 = 358.9 ci.

When the stroke is a specific number, you play with rod length and compression height to make up the rest of the distance. You can use any rod length and any piston compression height that you want. Your piston compression height is probably around 1.660-1.670" while using a 5.780" rod. Mine was 1.040" with a 6.400" rod. It makes for an extremely lightweight piston and with the Molnar rods, it was an extremely light bobweight. When turning extreme rpms, the light piston is easier on the rod and on the crank. We turned this one up to 8500 on the dyno.

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PostPosted: Mon Sep 03, 2018 3:03 pm 
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Joined: Tue Nov 06, 2012 10:23 am
Posts: 934
Location: Texas
Oh ok. Ya i didnt see anything in your build about the finished bore size. Thats why it was puzzling me cause i figured you had to go bigger and thought that was why you filled the block. So using the longer rod, wouldnt that kinda trick the engine into having a longer stroke or am i just imagining things :D

Question. I have always wondered how much weight does filling the block add?


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PostPosted: Mon Sep 03, 2018 5:22 pm 
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Joined: Mon Oct 29, 2012 9:05 am
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A longer rod can sometimes increase the torque. Depends on the setup.

The block filler usually adds 20-30 lbs, but it depends on the block size and how high you fill it.

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