volumetric efficiency

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volumetric efficiency

Post  mxer0022 on May 2nd 2015, 6:19 pm

Hey guys I'm trying to figure out what size carb I need. I've got a 73 429 with d3've heads. I plan on porting the heads and the motor only has a 600cfm carb on it now. I am trying to use a calculator to figure out what size carb need but I don't understand the volumetric efficiency. Can someone help me out with this?

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Re: volumetric efficiency

Post  kim on May 3rd 2015, 10:05 am

Figuring 6500 for a peak RPM, 429 cu in, a great carb for it would be the holley 950cfm. It would provide high end performance and yet have great street tunable manors.

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Re: volumetric efficiency

Post  dfree383 on May 3rd 2015, 10:12 am

What are you using it for?

What has been done to it?

What other driveline mods have been done?
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Re: volumetric efficiency

Post  mxer0022 on May 3rd 2015, 11:39 am

It's just gonna be an around town/on the weekends truck but I would still like it to get up and go quick. Probably won't see anything over 5K rpm. Probably mainly from idle to 4000. I'm pulling everything out now so I'm still trying to piece together a good build. I'm thinking along with the head porting I'll be putting on a dual plane intake, distributor and ignition, larger valves, milled heads, flat top pistons, a somewhat mild cam, and headers. I think that's all. Until I think of something else. Lol

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Re: volumetric efficiency

Post  kim on May 3rd 2015, 12:13 pm

With the id of parameters.   A 750 would be fine.

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Re: volumetric efficiency

Post  supervel45 on May 3rd 2015, 12:35 pm

What gear ratio/tire size and transmission/torque convertor are you going to use? Any idea on cam specs yet?

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Re: volumetric efficiency

Post  mxer0022 on May 3rd 2015, 3:07 pm

It's got 4.10 gears in it and I am clueless when it comes to cam parameters. I am still reading into the different lift, duration and other stuff that is involved in choosing a cam. As far as the tranny goes its a C6 I'm going to have a mild shift kit installed and probably just a 1500 stall.

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Re: volumetric efficiency

Post  supervel45 on May 3rd 2015, 3:56 pm

I think you will find a 429 built the way you describe will want to rev past 5K RPM's pretty quickly, at least mine did. A 750cfm will work well, esp above 5,000 rpm. If you are really going to stay at 5k rpm or below, I don't think you will notice much difference than with a 600cfm carb on the top end, and it will be less crisp at lower rpm's.

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Re: volumetric efficiency

Post  bbf-falcon on May 3rd 2015, 7:29 pm

750 ftw

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Re: volumetric efficiency

Post  DaveMcLain on May 3rd 2015, 7:39 pm

Use the carb you've got.

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Re: volumetric efficiency

Post  dfree383 on May 3rd 2015, 7:47 pm

An Eddie 750 or a 3310 Holley if your wanting to buy something, but like Dave said what you got will work.
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Re: volumetric efficiency

Post  mxer0022 on May 3rd 2015, 9:51 pm

What is the red line on a stock rotating assembly and heads?

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Re: volumetric efficiency

Post  69F100 on May 3rd 2015, 10:00 pm

mxer0022 wrote:What is the red line on a stock rotating assembly and heads?


my 460 I turned it 6500 with no problems with a stock bottom end the heads will depend on how they are setup I checked the bottom end few time while I ran it in my truck bearings always like fine. it made just a little over 500hp
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Re: volumetric efficiency

Post  FalconEh on May 3rd 2015, 10:50 pm

69F100 wrote:
mxer0022 wrote:What is the red line on a stock rotating assembly and heads?


my 460 I turned it 6500 with no problems with a stock bottom end the heads will depend on how they are setup I checked the bottom end few time while I ran it in my truck bearings always like fine. it made just a little over 500hp

^^^^ the safe max RPM of the rotating assembly, and the redline of a given engine will be different, depending on the sum of the parts, the redline for the given engine will be before valve-float occurs. If you plan the redline of the engine at or below the max of the rotating assembly you will inherently increase the longevity of the engine although you can exceed it substantially (for a given time).
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Re: volumetric efficiency

Post  dfree383 on May 3rd 2015, 11:17 pm

mxer0022 wrote:What is the red line on a stock rotating assembly and heads?

What kind of shape is it in? 40yo engine with unknown time and condition?

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Re: volumetric efficiency

Post  mxer0022 on May 4th 2015, 8:46 am

dfree383 wrote:
mxer0022 wrote:What is the red line on a stock rotating assembly and heads?

What kind of shape is it in? 40yo engine with unknown time and condition?

Oh it won't be stock. It's gonna be getting a full rebuild. Bottom, top and heads. Thanks for all help guys. I will be taking pics of the build as I go. I'll post up a new thread with pics of the build.

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