Personal 380 SBC Dyno

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Carnut1
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Re: Personal 380 SBC Dyno

Post by Carnut1 » Fri Aug 04, 2017 8:53 pm

Charlie Dart 200 pre platinum ported to 247cc 2.08/1.6 these flow what I wanted but ended up a bit larger than I had hoped.
Resized_20170804_204838.jpeg
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Re: Personal 380 SBC Dyno

Post by Carnut1 » Fri Aug 04, 2017 9:00 pm

20170804_205624.jpg
Very similar flows but Chad is getting it done with 42 less cc port volume.
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Re: Personal 380 SBC Dyno

Post by Carnut1 » Fri Aug 04, 2017 9:06 pm

20170804_210235.jpg
I find this graph very interesting .
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Re: Personal 380 SBC Dyno

Post by Carnut1 » Fri Aug 04, 2017 9:15 pm

20170804_210828.jpg
Port velocity graph. Now before you say mine is too slow and they may be mine were cut for 427-440 cube engine. I actually think Chad's are a bit fast on the high revving 380. His mill made excellent power but may have done even better with a larger port.
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Re: Personal 380 SBC Dyno

Post by Carnut1 » Fri Aug 04, 2017 9:30 pm

20170804_212043.jpg
Port energy graph, Chad gets 29.5 ft/lbs/in Port energy which is excellent. My Darts only manage 26.49 on the intakes. We are much closer on exhaust port energy. Thanks, Charlie
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Re: Personal 380 SBC Dyno

Post by Carnut1 » Fri Aug 04, 2017 9:52 pm

Resized_20170804_214340.jpeg
Part of the program I have not used much bit gives interesting info. I think looking at this info Chad needs a bit larger port on this screamer.
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Re: Personal 380 SBC Dyno

Post by GARY C » Sat Aug 05, 2017 12:16 am

Not sure how much it matters but Chads head port area shows 2.316 and you have it at 2.360?
Also the CFM@ peak lift, should that be 312cfm since he is only lifting .690?

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Re: Personal 380 SBC Dyno

Post by Carnut1 » Sat Aug 05, 2017 1:36 am

2.36 is a mistake. The lift is theoretical.

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Re: Personal 380 SBC Dyno

Post by Carnut1 » Sat Aug 05, 2017 1:28 pm

Looks like I killed another thread. I will interject some humor, one of these heads was done by one of the most respected airflow men in the country and one was done by a guy in his shed! I would love some feedback. Thanks, Charlie

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Re: Personal 380 SBC Dyno

Post by BigBro74 » Sat Aug 05, 2017 2:26 pm

Charlie- I think that what you have posted has really got me thinking about a couple points- some of which Chad has posted often before.
(thanks! to both of you for interesting reading)
-(appropriate) Area and velocity usually trump flow in CFM (people are always looking at flow)for a given application. I know this, but.....
-Knowledge of which of those characteristics a cylinder head needs for a given engine is where I need to learn the most!
- I have seen all this at work in my own engines (not gross miss-calibration, but smaller, noticable differences), and not put near enough time into
investigating it further.(sometimes lucky- sometimes less...)

I have to say that the cylinder head choice for Chads engine looks pretty good for his intended purpose- Even if he says "head limited" , he has gotten a very good chunk of what is available from the area!

When first reading this post, I was thinking "I bet he was targeting 650 HP, and now he is almost a 700........." :D

Jason

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Re: Personal 380 SBC Dyno

Post by Carnut1 » Sat Aug 05, 2017 2:40 pm

I agree, and the airspeed matched to the application is a huge part of the equation on a usable torque curve. Port energy gives us lots of data but if you use that data and can match the airspeed it will be an even better combo.

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Re: Personal 380 SBC Dyno

Post by cspeier » Sat Aug 05, 2017 4:02 pm

Carnut1 wrote:Looks like I killed another thread. I will interject some humor, one of these heads was done by one of the most respected airflow men in the country and one was done by a guy in his shed! I would love some feedback. Thanks, Charlie
Charlie I will post later. I'm actually at the track getting ready for the maiden voyage.

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Re: Personal 380 SBC Dyno

Post by Carnut1 » Sat Aug 05, 2017 4:07 pm

Sweet, have fun!

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Re: Personal 380 SBC Dyno

Post by vortecpro » Sat Aug 05, 2017 11:26 pm

Chad

What did your car run at Great Bend today,1900 feet? What MPH did it run at what weight, thanks.
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Re: Personal 380 SBC Dyno

Post by Kbails » Sun Aug 06, 2017 10:11 am

just thowing out a guess.. 5.80's 1/8 - 9.10 1/4 mile ? am I close
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