Personal 380 SBC Dyno
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Re: Personal 380 SBC Dyno
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.
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Re: Personal 380 SBC Dyno
Very similar flows but Chad is getting it done with 42 less cc port volume.
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Re: Personal 380 SBC Dyno
I find this graph very interesting .
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Re: Personal 380 SBC Dyno
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
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
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
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?
Also the CFM@ peak lift, should that be 312cfm since he is only lifting .690?
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Re: Personal 380 SBC Dyno
2.36 is a mistake. The lift is theoretical.
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Re: Personal 380 SBC Dyno
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
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........."
Jason
(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........."
Jason
Re: Personal 380 SBC Dyno
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
Charlie I will post later. I'm actually at the track getting ready for the maiden voyage.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
Re: Personal 380 SBC Dyno
Sweet, have fun!
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Re: Personal 380 SBC Dyno
Chad
What did your car run at Great Bend today,1900 feet? What MPH did it run at what weight, thanks.
What did your car run at Great Bend today,1900 feet? What MPH did it run at what weight, thanks.
Racing a NA NHRA stocker should be mandatory before any posting.
Re: Personal 380 SBC Dyno
just thowing out a guess.. 5.80's 1/8 - 9.10 1/4 mile ? am I close
Long Island, NY