i am fabbing an intake for my slant. what advantages does a longer runner length hold? looking at the stock intake for my slant, it seems like the air has to practically jump through a hoop to get into the motor.
Would sloping the runners downward into the motor, as opposed to running them straight in, have any advantage? the car will be a stock motor, plus some porting, headers, this intake, and 9.0 compression.

None unless it is carefully tuned to provide a resonance charging effect at a particular engine RPM.
Not sure what gives you this impression, which is not correct. The stock slant-6 intake was (and is) a vastly better design than most other carbureted inline-6 engines got, in terms of mixture distribution and freedom of flow.
No. All it will do is make the engine much easier to flood and create mixture distribution problems.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Longer runners will help low end torque and over all better mileage. Like Dan says you can tune for a certain rpm for max power like they did on the Hyper pack for more power out of the corners on NASCAR tracks.

At Western Washington State University I helped design some long runner mods for peak tuning at 2000 rpm. The Viking III actually got 120 mpg the year we raced it from Vancouver BC to Mexico. The runner length was 18" long.

Ram or pulse tuning can provide some good low end torque.

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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

I think having runners as near equal length as possible would be the best solution; vs any particular length.

With equal length, all cylinders would have similiar fill characteristics at the same rpm.

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

wonderful, thanks for the input.

what the heck is a viking 3??

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'72 Duster 198 stock cam, 3:23's Hookers on jack stands for 8 years in the driveway
'79 Maxivan 360 Offy Qjet Comp RV cam/rusting in the driveway.
93 D350 160HP Cummins Auto Dually Clubcab needs a injector pump
2005 Golden Couch Buick

here is an interesting article on tuning the runner length for different RPMs
http://www.chrysler300club.com/uniq/all ... theory.htm

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71 valiant 225, 904, 7 1/4
69 W200 power wagon 318, np435, np205, d44 front, d60 rear

You could always buy an Aussie Speed Hurricane manifold and then you would have equal length runners.

Frank

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Scrapple: Because a mind is a terrible thing to waste.
73 Duster - Race Car
66 Dart Wagon - DD
178" FED
82 D150
All Slant powered