Pulse Ram Charging N/A engine???


joe_thompson

joe_thompson

Engineering Tech
Joined
May 21, 2010
Messages
788
Anyone familiar with pulse ram charging n/a engines? Im currently doing some research and testing on the subject for inlet manifold design, using CFD and engine design software along with engine/fluid theory.

Just wondered if anyone as done anything with this for tuning purposes for our B series engines??
 
I haven't, but I am very interested. :D

Can CFD account for soundwaves in the airflow?
 
Kozy said:
I haven't, but I am very interested. :D

Can CFD account for soundwaves in the airflow?
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I thought i would only be a matter of time before you poped up. Geeks will be geeks.


Yes CFD can but its abit harder to set up than your average flow test. Tbh im going to need assistance in setting up the resonance waves and amplitudes with valve timing, it abit of new subject to me soo im still a novice.

Im going to model a b16 inlet and see how it can be tuned. Would love see what results can be seen in comparison to ITB's as technically you can create a positive pressure effect and induce VE higher than the engines swept volume with pulse charging unlike ITB's hmmmmmmmmmmmmmmmmmmm
 
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I'd be love to have a read of anything you come up with mate, all sounds very interesting! :nice:
 
joe_thompson said:
I thought i would only be a matter of time before you poped up. Geeks will be geeks.


Yes CFD can but its abit harder to set up than your average flow test. Tbh im going to need assistance in setting up the resonance waves and amplitudes with valve timing, it abit of new subject to me soo im still a novice.

Im going to model a b16 inlet and see how it can be tuned. Would love see what results can be seen in comparison to ITB's as technically you can create a positive pressure effect and induce VE higher than the engines swept volume with pulse charging unlike ITB's hmmmmmmmmmmmmmmmmmmm
Click to expand...

That's just a collection of fancy random words to me that don't really make any sense :shocked:

I think I get the idea :nerv:

:nice: Dunx
 
Good to see somebody on this forum delving into fluid dynamics in terms of parts development/selection instead of the usual 'how much power will this part make' without the science/theory behind the selection...this area is boring but interesting at the same time but i could never grasp pulse tuning and fluid dynamics but good look anyway.
 
qais_vtec said:
Good to see somebody on this forum delving into fluid dynamics in terms of parts development/selection instead of the usual 'how much power will this part make' without the science/theory behind the selection...this area is boring but interesting at the same time but i could never grasp pulse tuning and fluid dynamics but good look anyway.
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Im sure you could, Its all about trying bro! But yes i see your point, i guess unless people look into these type of thinks there wouldn't be certain products on the market.

Its really interesting :) or im just sad haha
 
Lol ur not sad, its ppl like you developing and researching stuff that allows engineering milestones,,,i get called a sado by mates just because i know what a throttle body is and they dont :)
 
once you've done that do the same with the exhaust manifold so that the exhaust pulse from one cylinder passes the join from 4-2 to effectively create a vacuum on the back of the other cylinders exhaust valve as it opens (again producing more power but very tricky to get the primarys just right in order for it to work and throughout a decent rev range) i've been trying to figure this out for my b18c but it's not something i have experience of myself
 
Here's one thing to consider.

Do you want all the cylinders tuned the same on intake an exhaust? That'll make a nice blip on the torque curve, great for a peak figure probably.

Or

Do you stagger the tuning, run a lower peak but a wider powerband?
 
Kozy said:
Here's one thing to consider.

Do you want all the cylinders tuned the same on intake an exhaust? That'll make a nice blip on the torque curve, great for a peak figure probably.

Or

Do you stagger the tuning, run a lower peak but a wider powerband?
Click to expand...


Hmmmmm it seems that most articles i have read seem to be about peak figures, but its a good point for having a larger spread power band, i assume offset pulses will enable larger power band but drop peak torque figure. There must be some calculation for play of between the two.

Im going to do some exel playing so i can change figures/dimensions to see the results as i already have some equations wrote by Stone.
 
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