Shorter Vs Longer Velocity Stacks

[junior varsity]

Jako Motorsport 900SSR with ram air:



Jako Motorsport Super-Due with split singles:

[koko64]

Do they sell an air box to the public?

[junior varsity]

i will be inquiring myself.   ...down the road.    perhaps if he was making two, it might be more worthwhile to him.

[koko64]

PM sent.
I'll check out the site now. Now I'm really in trouble..

[koko64]

Was the ram air bike injected? EDIT: Just noticed the FCR idle speed knob. The split single FCRs ran nice looking stacks. You can buy the various lengths from the Keihin catalogue. They looked like the anodized alloy ones.

I wonder if he could make an air box for the tandem FCRs using the stock K&N filter? With the tank up, there is quite a bit more room for air box 'sub filter volume' if the filter is at the very top of the air box. With the FCR type stacks this could give a nice meaty power curve.

I don't mind the long manifolds power characteristic on a street engine. The exception for me would be if I went the full MBP style route. I might just settle for a 44mm inlet valve and 944. Doug Lofgren has achieved 90-92 hp/70-73ftlbs with 944, porting, 44mm inlet valve, with stock cams on long manifolds. I think his long manifold hp outcomes are quite an acheivement.
The long manifolds give the torque peak 1000 rpms earlier, great on the street at the expense of bragging rights peak hp.

[koko64]

G'day j v.
I noticed all the split carb bikes were Supersports. I saw no Monsters with that set up on Jorg's site (he's the man!).

Looks like he does the MBP style big valve heads. Saw a dyno chart with a 104hp Supersport with 985cc, split Dell 'Ortos, and big valve heads. Looks like he uses IE type air boxes to run split single Dell'Ortos, although I did see split FCRs with pods. They were all crammed into the SS frames without the Monster cross member in the way. Interesting, and a dangerous website to visit!

Speaking of air boxes, an easier way to increase air box volume would be to make a spacer that fits between the sandwhich sections that screw together in the stock air box. This could give an inch or two in height before the filter is attached. Similarly, one could make a spacer between the filter and the air box.
I'm off work with the flu, bored. I sat there with an espresso looking at it today wondering how to extend the air box..

[koko64]

Next test is with pods as I have planned (when I'm well). I ordered the 1750's from Chris at Cal Cycleworks. I will test the pods with the same 'on the rich side' jetting that has given the best power with the open air box and short stacks. It has been said that the pods have a greater combined filter area and flow more air. I am curious if pods lose any power lower in the rev range or fail to smooth the air flow due to the internal shape. What is somewhat comforting is that Jako Motorsports , MBP, JD. Hord, D. Lofgren, etc have built motors with high power  outputs running pod (usually on split carbs). A mate of mine has a 944 with pods, 39 FCRs, Igniteck, Ti valves, a little porting,
and it does 3rd gear wheelies down hill.

I'll start another thread when I have the test results. Thank God for the internet coz I'm going nuts being ill and having to rest. This cold weather doesn't agree with me.

[junior varsity]

you can have the avg highs of 100+ F in texas right now...   

[ungeheuer]

I'll check out the site now. Now I'm really in trouble..

[koko64]

Hey j v, Unge
I love the heat, got thin blood like a snake, so Texas sounds great.
j v you get my pm?
Unge, we should ride again (when Im fit).. 
That is an amazing workshop at Jako. Ill more likley buy fancy heads from the States one day..

[greenmonster]

I am curious if pods lose any power lower in the rev range or fail to smooth the air flow due to the internal shape.

Thx f doing this!
A comparison same engine/same Dyno would maybe end the neverending debate.....

[ungeheuer]

Unge, we should ride again (when Im fit).. 

If its sunny tomorrow arvo I'm out Duc riding.  If its wet I'll be dirt roading on the DR.

Wanna come along? 

[koko64]

Still crook as a dog.

[ungeheuer]

I told you not to eat the vindaloo 

[koko64]

Hey Unge, I wish it was, but it's my lungs in this cold weather. Looking forward to to going for a ride and seeing your bike now it's finished.

Hey GM, if pods can be tuned to give me the same performance as the open air box with short stacks then I'll run them. The pods will drop weight (like j v I'm a motorcycle anorexic), make servicing easier and looks like it will let more cooling air thru to the rear cyclinder. I've heard that the pods (at least the RU1750 size) have more combined filter area and flow more air than the air box, so we will see what the dyno/EGA readings have to say. It will be interesting to see if the torque curve changes.

If MBP and Jako motors can flow enough air with pods to make 100hp then pods can't be too bad! An air box would be great if it was the right size/shape and the air filter and velocity stacks in the correct location. Jako is trying to tackle this with a delicious looking carbon air box . Comparing the air box of my GSXR to the Monster shows how compromised the Monster air box is. My take on my dyno tests so far is that they demonstrated working around deficiencies in the air box design as much as velocity stack tuning.

With my Shorai battery (730 GRAMS), (- 3KGS) have fitted the Igniteck and Kelley coils all in the battery box. So I have removed the coil plate (-207 grams) from the back of the air box. Haven't weighed the air box as I have left it on untill the pods arrive (and I recover from my illness). Anyone weighed a complete air box?

Will post a new thread on this soon.
Cheers

Final dyno run soon.. (well as final as Unges bike mods)..