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Re: Trick flow intake mods [Re: Streetwize] #3096131
11/21/22 06:06 PM
11/21/22 06:06 PM
Joined: Aug 2003
Posts: 40,855
Bend,OR USA
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Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
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Joined: Aug 2003
Posts: 40,855
Bend,OR USA
Was it #1 and #2 intake ports or #2 and #4 intake ports you're talking about?
I had never thought about the potential cross flow interference between #2 and #1 being 90 degrees away from each other on the firing order on a single plane single carb intake work
Thanks for opening my mind, a tiny bit whistling up bow

Last edited by Cab_Burge; 11/21/22 06:59 PM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Trick flow intake mods [Re: Cab_Burge] #3096135
11/21/22 06:12 PM
11/21/22 06:12 PM
Joined: Dec 2021
Posts: 810
Loudoun County, VA
Brad_Haak Offline OP
super stock
Brad_Haak  Offline OP
super stock

Joined: Dec 2021
Posts: 810
Loudoun County, VA
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The thing Vizard keeps stressing is the exhaust pressure wave of the subsequent cylinder (1 after 2, 7 after 5) starts pulling against the first cylinder before the fill cycle is over...

What's confusing to me is he says the adjacent cylinder robs from the first one as a result, but you need to make sure the second one still can pull adequate air-fuel mixture if you can reduce the cross-flow issue. Maybe I need to speak "British English" instead of "American English" to fully understand him. Or maybe it's all just me...

Last edited by Brad_Haak; 11/21/22 06:19 PM.

2021 Challenger 6.4L Scat Pack 1320 (2022)
100% stock: 1.680, 11.894 at 113.75 (DA 175 ft)
wheels, tires, air filter: 1.714, 11.833 at 115.80 (DA 310 ft)

1973 Challenger 452 ci street/strip (2008)
pump gas, DOT radials: 1.454, 10.523 at 126.44 (DA 514 ft)
Re: Trick flow intake mods [Re: Brad_Haak] #3096250
11/22/22 08:33 AM
11/22/22 08:33 AM
Joined: Jan 2003
Posts: 9,670
Weddington, N.C.
Streetwize Offline
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Streetwize  Offline
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Joined: Jan 2003
Posts: 9,670
Weddington, N.C.
Brad,

I actually have met David a couple times through a mutual friend.

He's much more lively in person,

Something to consider is at 90 degrees after TDC through maybe 115 ATDC (depending on the stroke and rod ratio) that first cylinder is at or very near peak piston velocity so I can fully visualize how the second cylinder is getting a bit "ripped off"....this is how I interpret what's going on anyway. I may be completely 180 off...or at least 90 off, lol. So if the second pulls on the first somewhere in the cycle....as the english would say...."Fair Play to #7" lol

Again when the engine is approaching peak torque there should be a slight "ram effect" in the plenum which should minimize...or "balance" the port flows to all cylinders, so the gains are probably slight and only over a relatively small part of the powerband.

come to think of it, Mark GY3 runs one of my old street Dominators on his Stroker big block, he picked up about what I quoted on his motor...as far as I know he still runs it and seems happy with it.




Last edited by Streetwize; 11/22/22 08:40 AM.

WIZE

World's Quickest Diahatsu Rocky (??) 414" Stroker Small block Mopar Powered. 10.84 @ 123...and gettin' quicker!

https://www.youtube.com/watch?v=-mWzLma3YGI

In Car:

https://www.youtube.com/watch?v=PjXcf95e6v0
Re: Trick flow intake mods [Re: Streetwize] #3096256
11/22/22 09:03 AM
11/22/22 09:03 AM
Joined: Dec 2013
Posts: 4,157
Wichita
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GY3 Offline
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Joined: Dec 2013
Posts: 4,157
Wichita
Originally Posted by Streetwize

come to think of it, Mark GY3 runs one of my old street Dominators on his Stroker big block, he picked up about what I quoted on his motor...as far as I know he still runs it and seems happy with it.





Yep, picked up exactly what you said it would on back to back weekends.

The cylinders seem to fill pretty equally with it, too, as I keep an eye on plugs since we run nitrous now.

I love it because it's stealthy and fits under my stock hood.

505 engine.jpg

'63 Dodge 330
11.19 @ 121 mph
Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs.
10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.

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