Engine building knowledge...please
#554798
12/15/09 09:00 PM
12/15/09 09:00 PM
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Joined: May 2009
Posts: 806
Iowa - a member of the rustbel...
Birdturd
OP
super stock
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OP
super stock
Joined: May 2009
Posts: 806
Iowa - a member of the rustbel...
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Hey guys I'm trying to learn about some items regaurding a stroker build of a 383 for my 68 roadrunner. At this point the car will mainly be a street car, with maybe the ocassional strip outing. I'm thinking of a 438 or 496 stroker kit from 440 source and also their stealth heads. I'm want to build an engine that appears stock externally and keep the "original" look to the engine bay. My question right now is how do you find the cylinder cross section of a particular head? I'm reading through Andy's book and since I kinda have a direction I'm trying to apply some of the stuff to help myself better build a budget I appreciate any help, hopefully my questions not too off the wall  josh
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Re: Engine building knowledge...please
[Re: AndyF]
#554801
12/15/09 11:20 PM
12/15/09 11:20 PM
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Joined: Apr 2006
Posts: 3,675
Akron, Ohio U.S.A.
roadhazard
master
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master
Joined: Apr 2006
Posts: 3,675
Akron, Ohio U.S.A.
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Quote:
An alternative answer is you find the cross section of a cylinder head by measuring it.
Height times width of the port gives you cross section in square inches.
If you don't like that answer then you can pour the head and measure the volume. Then divide by the length of the centerline to give you an average cross section. Look at the picture on page 53 to see an illustration of measuring port volume.
You meassure from the valve seat to the port entrance? Or how do you measure the length accurately?
I'm interested but lost on that procedure, i'm also slow 
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Re: Engine building knowledge...please
[Re: roadhazard]
#554802
12/15/09 11:32 PM
12/15/09 11:32 PM
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Joined: Feb 2007
Posts: 1,025
Las Vegas, NV
dodgeboy11
super stock
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super stock
Joined: Feb 2007
Posts: 1,025
Las Vegas, NV
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Measure the height and the width, start at say the pushrod pinch. Multiply those two numbers together. That'll give someone in the "know" an idea of what those heads are capable of. If you want to get deeper, measure at the pinch, then go in an inch, measure it again, then measure it again over the short turn, height and width again. And that's how you get the cross section.
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Re: Engine building knowledge...please
[Re: dodgeboy11]
#554803
12/16/09 06:13 PM
12/16/09 06:13 PM
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Joined: May 2009
Posts: 806
Iowa - a member of the rustbel...
Birdturd
OP
super stock
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OP
super stock
Joined: May 2009
Posts: 806
Iowa - a member of the rustbel...
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So once I figure the approx torque peak along with my torque numbers I can figure the rough hp #'s of what I'm thinking of building. Knowing that intake, exhaust, and other misc items may affect the outcome. Another question, keeping with the theme of an original looking engine so far I've come to the edelbrock dp4b intake. Is there another you'd recommend for better performance while looking stock. I know many people may not like the choice  but I will be painting the heads and intake all the stock 68 color.
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Re: Engine building knowledge...please
[Re: Birdturd]
#554806
12/18/09 12:02 AM
12/18/09 12:02 AM
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Joined: Aug 2003
Posts: 43,233
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,233
Bend,OR USA
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Quote:
So once I figure the approx torque peak along with my torque numbers I can figure the rough hp #'s of what I'm thinking of building. Knowing that intake, exhaust, and other misc items may affect the outcome.
Another question, keeping with the theme of an original looking engine so far I've come to the edelbrock dp4b intake. Is there another you'd recommend for better performance while looking stock.
I know many people may not like the choice but I will be painting the heads and intake all the stock 68 color.
I think that you will find that many different things affect the output of the motor, not just the heads and intake sizes  I have built several 440 motors using the same heads, pistons,Comp ratio, intakes and carbs ,gasoline and same dyno and only change the camshaft size and duration. This was on two different motors severl years ago,8 or so . The camshaft moved the peak power and peak torque up significently (SP?) What I'm trying to say is theory is one thing and actual results(depending on your motor assembling skills) can and may be different than the calculations say The DP4B is a real old intake design to look like a stock HP Magnum intake manifold, some even had Mopar part numbers on them for a while I like the newer Edelbrock Performer RPM intakes for a street car like your wanting   Good luck on your build, take your time and ask any questions you have anytime, way better to get it right the first time than to not make sure and have the motor die a early death due to a small infraction or a clearance overlooked 
Last edited by Cab_Burge; 12/20/09 02:08 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Engine building knowledge...please
[Re: roadhazard]
#554807
12/18/09 10:39 AM
12/18/09 10:39 AM
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Joined: Feb 2003
Posts: 12,675
Columbia, CT
moper
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 12,675
Columbia, CT
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Quote:
[You meassure from the valve seat to the port entrance? Or how do you measure the length accurately?
I'm interested but lost on that procedure, i'm also slow
I use a peice of thin wire. Form it to the roof of the port down the centerline from opening to the seat. Then do the same on the floor. Those two lengths averaged (add them and divide by 2) and you have your average port length.
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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Re: Engine building knowledge...please
[Re: moper]
#554808
12/18/09 11:04 AM
12/18/09 11:04 AM
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Joined: Apr 2006
Posts: 3,675
Akron, Ohio U.S.A.
roadhazard
master
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master
Joined: Apr 2006
Posts: 3,675
Akron, Ohio U.S.A.
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Quote:
Quote:
[You meassure from the valve seat to the port entrance? Or how do you measure the length accurately?
I'm interested but lost on that procedure, i'm also slow
I use a peice of thin wire. Form it to the roof of the port down the centerline from opening to the seat. Then do the same on the floor. Those two lengths averaged (add them and divide by 2) and you have your average port length.
That's what I was looking for! Thank You! 
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