Engine Build Time
Seasoned HDF Member
Joined: Mar 2010
Posts: 38,304
Likes: 6,325
From: Honah Lee
The bump issue in the intake is pretty interesting. Do the dimples in a golf ball make spin from a better contact on the club face and make it spin which like a spinning bullet help make it fly treuer? Or less wind resistance. Remember, compression drive the exhaust out but the intake is from atmospheric pressure driving the air in since the downward travel of the piston creates a vacuum that the atmosphere fills. A much slower travel of air then the exhaust (I think as far as speed) On the Olympics the other night, the new thing for less drag clothing they wear has small bumps, not divots..GO FIGURE !? Al, actual, they appear to have done yours based of years of evolution for the human throat..you even have one of those hangy down things in there, a uvila? HA That things is going to be so fast, I would be scared to ride on it.
Last edited by Jackie Paper; Feb 9, 2014 at 11:20 AM.
Thread Starter
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Elite HDF Member
Joined: Sep 2012
Posts: 3,791
Likes: 57
From: N Texas
Flow, drag, pressure, etc can certainly be elusive things to put your finger on. Early in the F-16 years they decided to put a bigger radar in the nose cone but they were very worried that the increased nose dome profile would increase the drag dramatically. When they got into the wind tunnel they found the opposite, that drag had decreased, somehow the air liked the new bigger contour of the nose cone over the more pointed and sharper original cone
HDF Community Team
Joined: Jun 2008
Posts: 4,756
Likes: 951
From: Out West
The dimples on the ball is say, akin to skipping a rock on water. You couldn't throw a rock on the water that remains in constant contact with the water and have it go as far as the skipping rock.
Now don't get me wrong, I didn't stay at a Holiday Inn last night and I've never played a Doctor on TV, I'm only passing on in my very humble ability what surfaced in my mind. Some of my thoughts and intelligence more often stay submerged in the deeper pools never to see light.
Now don't get me wrong, I didn't stay at a Holiday Inn last night and I've never played a Doctor on TV, I'm only passing on in my very humble ability what surfaced in my mind. Some of my thoughts and intelligence more often stay submerged in the deeper pools never to see light.
Club Member
Joined: May 2006
Posts: 14,564
Likes: 9,223
From: the 50s & the 60s
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no sir.
Doug Coffey. HeadQuarters.
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yeah if you look at the # on that head above - HQ7098
that's well over 28,000 ports that Doug has massaged.
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that work is not CNC.
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no sir.
Doug Coffey. HeadQuarters.
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yeah if you look at the # on that head above - HQ7098
that's well over 28,000 ports that Doug has massaged.
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Well I guess I will find out soon enough about my headwork. I am a big believer in CNC machining and do not see an advantage to a sharp ridge in the intake/exhaust ports over a more rounded ridge; you do not see sharp ridges like that used on subsonic airplanes on airfoils, elevators, etc. but as said before I am very new to the world of headwork.
Well I guess I will find out soon enough about my headwork. I am a big believer in CNC machining and do not see an advantage to a sharp ridge in the intake/exhaust ports over a more rounded ridge; you do not see sharp ridges like that used on subsonic airplanes on airfoils, elevators, etc. but as said before I am very new to the world of headwork.
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that work is not CNC.
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Thread Starter
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Elite HDF Member
Joined: Sep 2012
Posts: 3,791
Likes: 57
From: N Texas
I guess I just don't know where CNC starts and stops and the hand porting starts and stops, but I can understand that ridge not being the CNC area. Still cannot see where a sharp ridge has any advantage but maybe someone will enlighten me?
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Elite HDF Member
Joined: Sep 2012
Posts: 3,791
Likes: 57
From: N Texas
Time to move on. Today I moved all the connections from my stock throttle body to my HPI 55 mm tb. Pretty straight forward, the HPI instructions are good but had to use the HD SM too. I bought the HD Induction Module Service Kit 27655-06 and it had all new screws, o-rings, fuel injector clips, etc for all the parts that are supposed to be replaced.
One note I will make now - Early on I told myself not to buy used engine parts because it just did not make me feel very comfortable. Well I made an exception
for the HPI because it is somewhat pricey. I can say now that I wish I had stuck to my original plan, this HPI has been mishandled, the rear flange had a slight dent and the screw that holds the throttle cable bracket on has the allen head part mostly ruined. The seller rebated me a fair amount of $$ but I still regret not buying new.
Thread Starter
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Elite HDF Member
Joined: Sep 2012
Posts: 3,791
Likes: 57
From: N Texas
Have not had much to do on my build lately but the pace should pick up now:
Going to pick up the case tomorrow morning, my crank should be so straight and ready for action!
Going to pick up the case tomorrow morning, my crank should be so straight and ready for action!
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