Round runner is 2.03 sq. in. Un-ported head is 2.5 sq. in., rectangular. Least damaging transition shape ? Partial vertical divider in head port ?
Feeding 694cc/cyl.
Thanks, Art.
Round int. runner, rect. port in head
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mag2555
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Re: Round int. runner, rect. port in head
I have some questions for you first.
Is this a wedge chambered 2 valve head, or a Hemi?
Is the floor of the head port basically flat, or is it lower at the Manifold flange and rises up to meet the apex of the short turn?
How wide and tall is this rectangle?
Is this a wedge chambered 2 valve head, or a Hemi?
Is the floor of the head port basically flat, or is it lower at the Manifold flange and rises up to meet the apex of the short turn?
How wide and tall is this rectangle?
You can cut a man's tongue from his mouth, but that does not mean he’s a liar, it just shows that you fear the truth he might speak about you!
Re: Round int. runner, rect. port in head
Wedge, 15 deg. valve inclination. 1.19" wide, 2.25" tall with 3/16 r., 4 pl. Floor of port at entry, is 3/8" above deck. Top of "hump" approx. 1.25"
Aftermarket BBM.
Thanks, Art.
Aftermarket BBM.
Thanks, Art.
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mag2555
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Re: Round int. runner, rect. port in head
Ok. Forgive me for asking one more question, why for such a common motor are you stuck with a intake with round runners, or a round exit if that’s the case.
The biggest issue is that for a wide non rpm limiting peaky power torque and hp power band you want the intake runner to be expanding in area , not necking down .
The biggest issue is that for a wide non rpm limiting peaky power torque and hp power band you want the intake runner to be expanding in area , not necking down .
You can cut a man's tongue from his mouth, but that does not mean he’s a liar, it just shows that you fear the truth he might speak about you!
Re: Round int. runner, rect. port in head
How does that mesh with a planned IR. int. ,4bbl. TBI with 1 3/8" bores ?
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Chris_Hamilton
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Re: Round int. runner, rect. port in head
Fabricated manifold? Why not use a manifold with square ports?
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http://www.spiuserforum.com/index.php?t ... inia.9030/
http://www.spiuserforum.com/index.php?t ... inia.9030/
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mag2555
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Re: Round int. runner, rect. port in head
Can you post up a picture of this Intake?
You can cut a man's tongue from his mouth, but that does not mean he’s a liar, it just shows that you fear the truth he might speak about you!
Re: Round int. runner, rect. port in head
I haven't built intake, yet. I like the round alum. tubing, I have. It's 6061 , mandrel bent 1.61" id. with .14" wall. This means I can heat it and stretch it to conform with head, rectangular port. I find it interesting, no one mentions throttle bore mismatch to IR runners ? Goal is 1.47hp./cu. in. on E85.
Art.
Art.
Re: Round int. runner, rect. port in head
Just reading that my Weber IDF's , 44mm or 48mm carbs can use E85, why wouldn't I ? Trumpet tip to valve seat should be in 10"-12" range. Which size
start with ? Make intake runner same size as 48 mm.? Seems like I want runner angle, more complimentary to "hump" of runner in head ?
I could resort to a vertical port divider in head, if velocity is too low. One cylinder is 42.5".
Thoughts ? Art.
start with ? Make intake runner same size as 48 mm.? Seems like I want runner angle, more complimentary to "hump" of runner in head ?
I could resort to a vertical port divider in head, if velocity is too low. One cylinder is 42.5".
Thoughts ? Art.