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| 331ci 86GT - Just for fun. (Page 4/8) |
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fieroguru
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MAY 09, 05:53 PM
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The 400 sbc, where externally balanced with weights on the crank and balancer. Early strokers that used this crank, had to keep both weights. The aftermarket has been doing some interesting balancing things, so hopefully the description is correct where all you need is the 86+ flywheel and don't need to mess with a weight on the balancer. Not much room for it with the Archie balancer.
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La fiera
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MAY 09, 08:49 PM
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| quote | Originally posted by fishsticks:
All SBC's are -technically- internally balanced. However, the post 86 blocks and roller blocks (1 piece RMS) moved the rear crank weight to the flywheel to make room for the rear main seal adapter. A lot of people consider that to now be externally balanced.
The one I bought is a later roller block, so it will be 1 piece RMS and need the weighted flywheel. If you look in the description, they refer to the block as a "Seasoned OE 4 bolt main 1pc seal 1996-2000 roller block". That means it will be an L31 block.
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Ah I see!! Get yourself an ATI Superdamper for it. You will fell the difference.
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fishsticks
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MAY 09, 11:14 PM
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| quote | Originally posted by fieroguru:
The 400 sbc, where externally balanced with weights on the crank and balancer. Early strokers that used this crank, had to keep both weights. The aftermarket has been doing some interesting balancing things, so hopefully the description is correct where all you need is the 86+ flywheel and don't need to mess with a weight on the balancer. Not much room for it with the Archie balancer. |
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Good catch. I did check Scat's catalog though and all their 3.75 stroke cranks are internally weighted on the front side.
Fun fact: The balancer on the front of my engine is a stock balancer for 67-71 Chevy inline 6 engines. I believe it's the same one Archie uses. Dayco PB1023N The timing mark just needs moved.
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fieroguru
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MAY 10, 11:20 AM
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| quote | Originally posted by fishsticks:
Fun fact: The balancer on the front of my engine is a stock balancer for 67-71 Chevy inline 6 engines. I believe it's the same one Archie uses. Dayco PB1023N The timing mark just needs moved. |
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If you want to move into the serpentine belt era...
https://www.fiero.nl/forum/Forum2/HTML/118182.html
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fishsticks
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MAY 10, 01:56 PM
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Shhhh I don't need another project to add to the list. 
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fishsticks
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MAY 11, 11:42 AM
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Started ordering supporting parts today, starting with an oil pan:
https://www.moroso.com/chevrolet-small-block21320/
I'd rather there were a few more dimensions on that listing. But taking rough measurements with a tape shows it should clear the passenger side axle.
The capacity will be nice, but I'm really after some proper windage control and the crank scraper. It always seemed to me that windage issues would be compounded in an SBC Fiero, since oil will slosh to the passenger side (rear) of the pan during acceleration. Circle track guys deal with essentially the same issue.
Also grabbed the deep sump and a Melling 55HV.[This message has been edited by fishsticks (edited 05-11-2021).]
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La fiera
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MAY 11, 10:24 PM
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I'm building a 383 for a customer and it will go in a 1969 C10 Chevy pick up 4 speed manual.
And I'm using a real man's cam, solid flat tappet. 
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fishsticks
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MAY 11, 11:46 PM
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Solid flat tappet for all those revs you need for a truck. Better put some triple valve springs on it too.  At least it's neon green so he won't lose it. 
I like how you mounted your methanol tank directly between the carb and the intake manifold on your car. Less hoses that way.
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La fiera
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MAY 12, 06:18 PM
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| quote | Originally posted by fishsticks:
Solid flat tappet for all those revs you need for a truck. Better put some triple valve springs on it too. At least it's neon green so he won't lose it.
I like how you mounted your methanol tank directly between the carb and the intake manifold on your car. Less hoses that way. |
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Dual springs on solid cams is old tech, there's so much advance in metalurgy today that makes dual springs obsolete. I've always used very aggressive solid profiles with single springs. The engine in my car is F.I. The big box is to constantly keep full atmospheric pressure at all RPMs at WOT.
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fishsticks
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MAY 12, 07:01 PM
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| quote | Originally posted by La fiera:
Dual springs on solid cams is old tech, there's so much advance in metalurgy today that makes dual springs obsolete. I've always used very aggressive solid profiles with single springs. The engine in my car is F.I. The big box is to constantly keep full atmospheric pressure at all RPMs at WOT. |
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I am just razzing you.
I don't bother with flat tappet anything anymore, since roller ramp designs are so much better. The triple spring thing was for the old guys jumping coke cans in the back.
And I figured it was some sort of plenum on your car.
Where I come from, if we talk smack to you it means we like you.
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