Porks bike carbs and boost project

[Enuo]

Just run the sc and turbo in parallel with a non return valve after turbo, no solenoid valve needed

 

[pork]

Better? One valve, no solenoid

 

[Enuo]

Better? One valve, no solenoid

There is still nothing stopping boost from sc blowing back through the turbo and escaping eh? Was thinking more like this:

The non return flap valves stop boost escaping back through the charger producing the least boost
Edit: This way will give a VERY smooth transition from SC to turbo, as long as the turbo comes on boost before the sc cutoff rpm

 

[pork]

That makes more sense..........long day, brain melted

 

[pork]

Having trouble finding a valve that's 2.1/4 inch, unless it's a plastic pool/pond type, and they are pricey!!

So may have to maje one unless anyone can suggest otherwise

 

[frank]

500 cc crosser reed valves are about that size neil

 

[pork]

Cheers (actually i do remember you suggesting that earlier on)

 

[frank]

Cheers (actually i do remember you suggesting that earlier on)

you would only need the 1 eh neil, mounted in the s/c exit pipe

 

[Enuo]

you would only need the 1 eh neil, mounted in the s/c exit pipe

Turbo exit pipe surely? Much easier for sc to blow past a non spun turbo than for a turbo to blow through an unspun screw supercharger eh

 

[frank]

Turbo exit pipe surely? Much easier for sc to blow past a non spun turbo than for a turbo to blow through an unspun screw supercharger eh

Nah, siamesed inlet with the reed valve in the s/c exit, then you can choose between the 3 options at the flick of the magnetic clutch switch

 

[mas12555]

You ever thought of looking at the super turbo diagrams? I got a march brochure with one in it will scan it for you.

 

[mas12555]

Sent from my GT-P5110 using Tapatalk 2

 

[Enuo]

Nah, siamesed inlet with the reed valve in the s/c exit, then you can choose between the 3 options at the flick of the magnetic clutch switch

Quick sketch for my bleach fume soaked brain?

 

[pork]

How about this?

1 valve

 

[Enuo]

How about this?

1 valve

That would work but I've never seen or heard of a valve like that... maybe you could make one?

 

[pork]

Yeah, was thinking I'd have to maje it, not to hard tho

Il pump myself full off coffee and draw it lol

 

[Enuo]

What I'd do is hook the sc outlet up to a compressor and see what the leak through it is like, if its not too bad you might get away with one reed switch

 

[frank]

Turbo exit pipe surely? Much easier for sc to blow past a non spun turbo than for a turbo to blow through an unspun screw supercharger eh

yes my bad andy reed valve on the turbo exit and siamesed chargepipe (the s/c is positive displacement eh),
so the electromagnetic clutch switch will determine whether you want s/c then turbo, s/c + turbo, or turbo only...........very simple setup

 

[pork]

My changeover valve lol

 

[pork]

Black plate moves over to blank off other inlet once spooled up

 

[Noddie]

My vote is with bike reed valves. Simple is almost always better

 

[h701micra]

I'd go for giving the s/c it own inlet and just a bypass valve on s/c exit

No extra heat by blowing through each other and you can link the bypass valve to the electroclutch
So it closes when the clutch goes off
Much simpler no?

 

[Enuo]

I'd go for giving the s/c it own inlet and just a bypass valve on s/c exit

No extra heat by blowing through each other and you can link the bypass valve to the electroclutch
So it closes when the clutch goes off
Much simpler no?

Drawings?

 

[h701micra]

Drawings?

Bare with me a few minutes

 

[h701micra]

Bare with me a few minutes

Found it

 

[pork]

What stops air being blown back out turbo?

 

[Enuo]

Found it
View attachment 27392

Nothing to stop boost generated by supercharger escaping back through turbo eh

 

[h701micra]

Nothing to stop boost generated by supercharger escaping back through turbo eh

It should be ok. That drawing is exaggerated to give me a clear view. But the charged air would have make near enough a u-turn to towards the turbo. The turbo pipe should have a positive pressure in it to prevent that and also engine vacuum

 

[pork]

Wouldn't that sort off stall the turbo aswell?

 

[Enuo]

It should be ok. That drawing is exaggerated to give me a clear view. But the charged air would have make near enough a u-turn to towards the turbo. The turbo pipe should have a positive pressure in it to prevent that and also engine vacuum

That U bend won't stop the boost escaping mate, will only limit the flow slightly. Unless the turbo is generating as much as or more pressure than the S/C the compressed air will escape through it no matter how convoluted the path

 

[Enuo]

Wouldn't that sort off stall the turbo aswell?

Nah, driving air back through a turbo does hardly anything, would still spin up fine, will just get chatter which won't help the life expectancy...

 

[h701micra]

That U bend won't stop the boost escaping mate, will only limit the flow slightly. Unless the turbo is generating as much as or more pressure than the S/C the compressed air will escape through it no matter how convoluted the path

We'll soon see
I'm confident it'll be ok. Basing it in the "air flows the path of least resistance"

 

[Enuo]

We'll soon see
I'm confident it'll be ok. Basing it in the "air flows the path of least resistance"

Flow and pressure are different beasts remember

 

[h701micra]

Flow and pressure are different beasts remember

I'd say that rule would apply regardless.
Only thing is if the boost backed up from the inlet back down the charge pipe. Which I don't think it will

Worst case scenario I'll put another bypass valve in to alternate between each intake

 

[Enuo]

I'd say that rule would apply regardless.
Only thing is if the boost backed up from the inlet back down the charge pipe. Which I don't think it will

Worst case scenario I'll put another bypass valve in to alternate between each intake

Well it will because while the engine isn't admitting air the pathway is blocked and the only 2 exits are back through sc or back through tc, and the sc will easily overpower the turbo. Just checked with another maintenance bloke here and he came to the same conclusion...

 

[h701micra]

Well it will because while the engine isn't admitting air the pathway is blocked and the only 2 exits are back through sc or back through tc, and the sc will easily overpower the turbo. Just checked with another maintenance bloke here and he came to the same conclusion...

Only time it wouldn't permit air is when the throttle is closed? So it would be released to atmosphere

 

[Enuo]

When inlet valves are closed?

 

[Enuo]

And even when open there isn't alot of space in cylinder for the air to escape into eh

 

[h701micra]

When inlet valves are closed?

Hardly an issue even at idle.. at 800rpm that's 13 revolutions a second.
4inlet cycles per revolution.. 52 a second... I'd say it'd soon draw it through?

Is this where volumetric efficiency comes into it?

 

[mehdi]

hi every one
needing help,got a k11 it won't start, took it to the garage somthing is wrong with the injectors as there is no signal the mechanic said start from the ignition reader and buy one and lets see what gonna happen
any idea guys?
many thanks

 

[pork]

Think you in wrong section mate lol sorru

 

[pork]

So this is what I'm making for the switch over valve......

Easy,, cut 2 57mm discs from some plate, attach to a rod, one vertical (closing 1 pipe) and the other flat (opening 2nd pipe)
Have actuator push lever to rotate the rod. 90degrees, opening pipe 1, closing pipe 2

Should be a smooth transition too

 

[h701micra]

Could use an old throttle body cable assembly?

 

[pork]

I guess so

Quite confident with that idea, jus need 57mm hole cutter and il build it tomirie

 

[Enuo]

I guess so

Quite confident with that idea, jus need 57mm hole cutter and il build it tomirie

I challenge you to build the whole thing running off compressed air generated by the sc/turbo *evil grin*

 

[pork]

Challenge accepted



I've got most off the inlet/outlet pipes fabricated (forgot pics!) today too.

I've got BMW mini idle bypass to fit in somwhere too, or would the BOV be enough at idle?

 

[l_jonez]

Can't wait to see this finished

 

[pork]

Can't wait to see this finished

Me too!

How's yours coming along? Waiting to see how you convert your to bike itb's........so I can steal your ideas

 

[l_jonez]

Me too!

How's yours coming along? Waiting to see how you convert your to bike itb's........so I can steal your ideas

Everything is ready. Last week I fitted the new fuel line, what a pain in the ar*e! had to remove both front and rear subframes :-(
just need the ecu now, sadly I have to keep dipping into the car fund ( new phone, Xmas and now a holiday) but hopefully I can buy it in Feb and get it fitted before the MOT in march

 

[pork]

Sounds like a right chore!

Still sticking the turbo on too?