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  #16 (permalink)  
Old 12-21-2012, 06:03 PM
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ChevroletSS,
Another thing about 6" rods in a sbc is that it can become an internally balanced rotating assembly without adding heavy metal to the crank, at least it was for my Scat crank/rod assembly.
A lot less load on the front of the crank & #1 main bearing by using a neutral balanced dampner instead of the offset weighted type normaly used with 5.7" rods.
What alot of people would point out is that a 6" rod requires the use of a piston with the pin location raised closer to the top of the piston. This reduces the amount of room for the rings. Most but not all pistons for a 6" rod
have the pin hole intersecting the oil ring grove requiring an oil ring support rail.
I know of at least one piston that doesn't have the piston pin hole intersecting the oil ring groove, but it uses 1.5mm rings and is fairly expensive for a set($650). Mahle PN SBC125040F05 for 0.040" overbore.
High quality works of art IMO.
ssmonty
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  #17 (permalink)  
Old 12-21-2012, 06:45 PM
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Isn't there a internally balanced rotating assembly with 5.7 rods
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  #18 (permalink)  
Old 12-21-2012, 07:03 PM
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Quote:
Originally Posted by ChevroletSS View Post
Isn't there a internally balanced rotating assembly with 5.7 rods
If you find light enough rods and pistons you can do it, or you can use mallory metal. Running a forged crank will help too as they can be heavier than cast cranks.
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  #19 (permalink)  
Old 12-22-2012, 03:15 AM
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I noticed you letting the peak power rpm curves creep up on you again.............
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Old 12-22-2012, 04:22 PM
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I think Im gonna go with an assembly internally balanced with 5.7 rods. Its hard to pull the trigger and throw money at this cause I just wanna make sure I get what is best.

Thanks
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  #21 (permalink)  
Old 12-22-2012, 07:00 PM
How fast is fast enough?
 
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I think Im gonna go with an assembly internally balanced with 5.7 rods. Its hard to pull the trigger and throw money at this cause I just wanna make sure I get what is best.

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Why not 6" rods?
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Old 12-22-2012, 09:30 PM
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Well I mean is it worth doing. Are they that much better. I couldn't find a assembly kit that had 6 inch rods so I said the hell with it, guess I could bye them separate. Just figured I could get a kit already balanced guaranteed to be ready to install. But that's why I'm on this site cause I don't know jack about performance builds and need you all. It does make sense to safe weight but couldn't find a kit. And other stock builds I've done I just got the balanced ready to install kits to make it easier and save money. I'd like one that was internally balanced if u all could find one. Also what's the difference in 5140,4260,8740, and 4340 rods and can I go longer than 6 inch and what about h beam, I beam, or a beam. Floating pin or pressed fit pin. Does it matter if its shot peened or polished and shot peened finished. Straight or tapered..... http://www.summitracing.com/parts/es...make/chevrolet



What about those above. For 500 hp

Last edited by ChevroletSS; 12-22-2012 at 09:55 PM.
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Old 12-22-2012, 10:00 PM
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What's better dished or flat top pistons
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Old 12-22-2012, 10:15 PM
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Chevy 383 Roller Build (cont.....)

Here is an Eagle rotating assembly with 6.0 h-beam rods, forged SRP pistons, cast crank and internally balanced by CNC Motorsports. Eagle Street/Strip Kit, SB Chevy 350/383(87-99), 3.750' Eagle Crank, 6.0' Eagle Rods, 9.8:1 SRP Pistons - SB Chevy 383 Assembly kits - Eagle Street\Strip Rotating Assembly Kits - Eagle Rotating Assembly Kits - Rotating Assemblies | CNC Motorsports | . This Scat rotating assembly from Summit Racing says it is internal/external balanced so I am assuming it comes with a neutral weight balancer and a weighted flexplate. This is because of the one piece rear main seal. You can call Summit Racing to make sure. Scat Engine Rotating Assemblies 1-91250BIE - SummitRacing.com
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  #25 (permalink)  
Old 12-22-2012, 10:35 PM
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even if you buy a balanced kit,how accurate is it? I would check balance anyways.You cannot just buy a bucket of parts and mechano them together
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Old 12-23-2012, 08:58 AM
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I have a very good condition crank I'm taking to the machine shop to get checked. Does anyone make a kit with just rods and pistons??
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Old 12-23-2012, 01:16 PM
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Chevy 383 Roller Build (cont.....)

Is your crankshaft for a 383 ci or 350 ci? The Scat 2-ICR6000 are 4340 forged rods that are stroker clearanced. They sell for 215.95 at CNC Motorsports. Icon Forged Pistons IC784-030 sell for 499.95. Probe forged pistons 12345-030 sell for 474.95. There are no rod & piston kits listed. These rod and pistons are for a 383 ci with 9.5 compression with the AFR 195 65cc chambered heads. Icon IC734-030 Forged Dish Pistons 4.030 Bore | CNC Motorsports | Car Parts | Truck Parts | Competition Engines Probe SRS 9.71:1 Reverse Dome, SB Chevy 383 (4.030 bore) 3.750 Stroke, For 6.0' rods | CNC Motorsports | Car Parts | Truck Parts | Competition Engines Scat 2-ICR6000 Pro Stock I Beam Connecting Rods | CNC Motorsports | Car Parts | Truck Parts | Competition Engines
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  #28 (permalink)  
Old 12-23-2012, 01:35 PM
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I told him about the Howards deal for very good reasons.I know full well about the Scat and OMG Eagle brand names.Yet I suggested Howards...............and a relative low SCR high torque off idle.......Humm??.

I am suggesting he experiences low 400lbs of torque@2500 and all in just shy of 500lbs or just at 500lbs of torque @3500.Certainly at a cost of HP I agree.But for street light to street light for a vehicle on the street it is a approach very viable.As long as he figures a way to hook the car,he is going to be very happy with it.

Last edited by 1Gary; 12-23-2012 at 01:46 PM.
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Old 12-23-2012, 02:49 PM
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My setup Im wanting to go with with the parts I listed will have my TQ 457 FT LB @ 2500, 467 @ 3000, 483 @ 3500, 511 @ 4000, and peaks 517 @ 4500.

The HP: 231 @ 2500, 273 @ 3000, 322 @ 3500, 389 @ 4000, 443 @ 4500, 480 @ 5000, 503 @ 5500, and 502 @ 6000

This information is off a dyno sheet. I think these are very good numbers. These parts were put together to build a quality street motor.

I will be getting forged everything. Dont know why I said that. If Im gonna do it big might as well do it right and not be sorry later. so I will be going threw howards to get my rotating assembly, I think, def a crank.
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  #30 (permalink)  
Old 12-23-2012, 11:17 PM
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Is that a dyno sym from Techinspector??.

Those numbers look good.Sorry if I misunderstood the direction the build was going in.
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