You could always buy an Aussie Speed Hurricane manifold and then you would have equal length runners.
Frank
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| fabbed intake https://slantsix.org/forum/viewtopic.php?t=39361 |
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| Author: | hello, operator [ Thu Mar 11, 2010 10:09 am ] |
| Post subject: | fabbed intake |
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. |
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| Author: | SlantSixDan [ Thu Mar 11, 2010 10:17 am ] |
| Post subject: | Re: fabbed intake |
Quote: i am fabbing an intake for my slant. what advantages does a longer runner length hold?
None unless it is carefully tuned to provide a resonance charging effect at a particular engine RPM.Quote: 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.
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.Quote: would sloping the runners downward into the motor, as apposed to running them straight in have any advantage?
No. All it will do is make the engine much easier to flood and create mixture distribution problems.
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| Author: | Aggressive Ted [ Thu Mar 11, 2010 10:35 am ] |
| Post subject: | |
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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| Author: | emsvitil [ Thu Mar 11, 2010 6:40 pm ] |
| Post subject: | |
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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| Author: | hello, operator [ Thu Mar 11, 2010 11:09 pm ] |
| Post subject: | |
wonderful, thanks for the input. |
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| Author: | Rug_Trucker [ Fri Mar 19, 2010 1:20 pm ] |
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what the heck is a viking 3?? |
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| Author: | powerwagonpaul [ Fri Mar 19, 2010 5:28 pm ] |
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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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| Author: | 66aCUDA [ Fri Mar 19, 2010 8:39 pm ] |
| Post subject: | |
You could always buy an Aussie Speed Hurricane manifold and then you would have equal length runners. Frank |
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