Do we really need them?
This is the question that I am researching right now.
Turbo or Supercharged piston engines typically use many cylinders arranged in-line and one or two superchargers. Superchargers deliver air at a relatively constant rate, while cylinders demand it in a varying manner, as the valves open and as piston speed varies through the stroke. Simple direct ducting would give problems where the nearest cylinders received more airflow. The pulsating demand from the cylinders would also show problems of either pressure waves in the duct, or a shortage of inlet air towards the end of the inlet phase.
The solution is to provide a large-volume plenum chamber between the inlet and the cylinders. This has two benefits: it evens out the difference in path restriction between cylinders (distribution across space), secondly it provides a large-volume buffer against pressure changes (distribution over time
We have been thinking with Mukle, what kind would be a good universal plenum for V-Rod.
Here it is.
The plenum is possible to use right or left side feeded.
A charge tupe can be fitted every 45deg position.
Volume of the plenum is about 2000cc.
Multi purpose flange, which we will machine on Saturday, is used with the plenum.
Karzza, Beautiful work ! Like Ken, add velocity stacks to the inlets inside the plenum. On the inlet, why not simply have a 1" long straight pipe ( 2 1/2 OD ?), anyone can use a silicone adapter to turne it any direction at any angle they wish ? Less expensive to fabricate as well.
All the needed connections (1/8"NPT) are located to the flange. A plugged BOV-location is possible to utilize for measure-purposes.
Mukle is checking if 280mm total lenght woud be possible w/o hitting to an airbox cover. More lenght would help airflow near and around of the velocity stacks.
Personally I believe a linear airflow is the best in a plenium and in runners. (Target is to turbulece fuelled air flow into a cylinder after passing a valve plate)
rsc, can You explain "Just need to make sure that there are fluts on the adapter at least .500 of an inch high" in other words.
More ideas and comments are wellcome to design the best plenum for everyone.
The plenum is sligtly re-shaped and the volume is now 2300cc.
Also an airflow aroud of velocity stacks is better at the moment.
A Volume of a 50cm 2" charge tube is 870cc, so a packet w/o a cooler would be 3170cc.
1130cc it means 2.8x engine displacement
1250cc it means 2.5x engine displacement
Should be pretty good.
We will machine the 9pcs of flanges tomorrow...and my new 60 trim compressor housing.
I will sent a picture.
Karzza, Since you are going all out, may i suggest a pair of injector nozzle ports as an option on the top of the housing ? It will require a different ECU, but would allow for a "shower head" injector system that would run smaller injectors at part throttle and second set to come on with boost. More efficient than one big set. I like the air horns & modified inlet, but still think 2 1/2" might be considered.
We spend a 13 hours long maghining day, here is an output.
I will purchase o-rings, screws, washers, IATs+sockets etc. in beginning of January, when I'm back in business.
(Moderator can convert the pictures to thumbnails)
While working on my new plenum, I decided to upgrade my oil return line from the turbo to the filler neck. This is about $25 in parts off Ebay. Which one would you rather have on your bike ?
I needed to clock the outlet on my turbo & noticed I had about a 1/8" mismatch for close to 1/2 of the turbo to the outlet tube. I cleaned that up an polished out the inside as far as my sanding roll could reach. It was a kit on Ebay from Standard Abrasives for something like $28 shipped. Hope you can see the improvement in the pictures.
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