The strangest of noises

[unstuck]

Some bugger has put one of them things off a kids bike on the swingarm, so when the wheel goes round it goes click click click.

[the bear zxr]

oh entertainment I will give! i recently bought a reel mower with a turbo... (hey, at 80bux i couldnt pass it up!) and now that I have a complete spare engine... well, that wee turbo might make a move... *waits for the torrent of abuse at the mere mention of a 250 turbo* haha fun project; regardless of eventual poor gains

[ducatilover]

It's not terribly hard to split the cases on a ZXR. And if you're blueprinting an engine, you'll be well up to a simple mechanical job like that.

What flavour turbo is it you're chucking at your spare motor?
Run a slotted pickup on the ignition for some retard (hehe retards) and a thicker base gasket and it'll be fine. I wouldn't run anything much bigger than a flowed IHI RHB31 on a 250/4 though and a 31 won't come on boost 'till around 12krpm anyway.
Setting the carbs up is a little tricky, but once you have the dimensions and position of your bowl vent sorted and a decent sealed airbox it's a walk in the park. You'd not be wanting to push any more than 4-5psi fuel pressure in to the little CVKs too, they only run 8mm diameter float needles and leak, then the bowls will leak.

Post pics and do mad skids when you build it. Small motors with turbos are fun, sound impressive, feel impressive but still slow as fuck and you won't lose your licence too fast on one

[unstuck]

Small motors with turbos are fun, sound impressive, feel impressive but still slow as fuck and you won't lose your licence too fast on one

Bullshit.......I had a Johnsereds turbo chainsaw and it was shit. The only thing it did quicker was foul up the air cleaner.

You found that stick in your spokes yet bear?

[Drew]

It's not terribly hard to split the cases on a ZXR. And if you're blueprinting an engine, you'll be well up to a simple mechanical job like that.

What flavour turbo is it you're chucking at your spare motor?
Run a slotted pickup on the ignition for some retard (hehe retards) and a thicker base gasket and it'll be fine. I wouldn't run anything much bigger than a flowed IHI RHB31 on a 250/4 though and a 31 won't come on boost 'till around 12krpm anyway.
Setting the carbs up is a little tricky, but once you have the dimensions and position of your bowl vent sorted and a decent sealed airbox it's a walk in the park. You'd not be wanting to push any more than 4-5psi fuel pressure in to the little CVKs too, they only run 8mm diameter float needles and leak, then the bowls will leak.

Post pics and do mad skids when you build it. Small motors with turbos are fun, sound impressive, feel impressive but still slow as fuck and you won't lose your licence too fast on one

You are making it all too hard.

Put a box around the carbs, so the pressure behind the slides is matched around the carbs, and the CV carbs will work exactly like they do now. The box needs to be of similar volume to the standard air box to mimic the still air they draw from standard.

Fuel gets pumped into a T with a bit of volume to it that sits inside the box and above the carbs. Off the bottom of the T goes to the carbs, off the other side back into the tank. Fuel sussed.

Bigger jets, and you are away laughing. About the biggest issue I would foresee is reliable oil feed to the turbo, without compromising the rest of the motor's supply.

Oil return from the turbo to the sump, should have a reservoir to let the boiled oil condense and not cause grief.

[jasonu]

You sound like a fuckwit.

and you ARE a fuckwit.

[bogan]

Fuel gets pumped into a T with a bit of volume to it that sits inside the box and above the carbs. Off the bottom of the T goes to the carbs, off the other side back into the tank. Fuel sussed.

If one end is open back to the tank, isn't it just going to boost all the fuel out into the lower pressure tank anyway, regardless of whether a pump is circulating it around or not...

Fluid dynamics can be hard, kind of like a sci fi book I'm reading in which orbital houses suck air up out of the atmosphere through really really long straws, not a major plot point but it gets on my nerves nonetheless.

[gammaguy]

That's not very helpful.

The truth is often not helpful

If I was still running my workshop,that is what I would be doing

[ducatilover]

You are making it all too hard.

Put a box around the carbs, so the pressure behind the slides is matched around the carbs, and the CV carbs will work exactly like they do now. The box needs to be of similar volume to the standard air box to mimic the still air they draw from standard.

Fuel gets pumped into a T with a bit of volume to it that sits inside the box and above the carbs. Off the bottom of the T goes to the carbs, off the other side back into the tank. Fuel sussed.

Bigger jets, and you are away laughing. About the biggest issue I would foresee is reliable oil feed to the turbo, without compromising the rest of the motor's supply.

Oil return from the turbo to the sump, should have a reservoir to let the boiled oil condense and not cause grief.

Or you just make a stainless airbox with the bowl vents pointing in to the airflow (the ZXR CVK have the external bowl vent if I remember correctly, runs over the top of teh fact. air box, comes out between carbs 1/2 and 3/4), once you work out the right sizes you can get away with stock jetting. I have a spreadsheet on one of my PCs for working out the correct sizes in relation to your intake piping
Then a fuel pump with a 1:1 rising rate regulator and you're good to go.
Without the 1:1 FPR it'll never perform at its best and the same goes for the air pressure in the bowls.

Plus all the other annoying shit.
BOV, because compressor surge isn't as cool as it sounds.
An ext waste gate, bitches love them.
No need for an I/Cooler in the real world and under 7 psi
Oil lines are easy enough, you'll probably be needing a restrictor on the feed to the turbo and you're away laughing, with 60 potential whopping laggy as fuck and awesome horsepowaaaah.


Not that I'd know anything, I'm just a GN owner.

[the bear zxr]

the bowl vents are a piece of piss, just bore the existing velocity gate in the slide (small hole that goes through on the throat side of the slide) im running no aibox atm, only getting a little resonance flutter at the moment in terms of performance, the real deal will be an f-glass full shaped plenum of 1->4 design (think headers) with a second pressure nipple off compressor (like the existing boost controller nipple) to opperate the cv lines... im doing a 0.5mm dia. hone on all cylanders, then using forged cbr mc19 pistons, (theyr a tiny bit fatter and a tiny bit shorter so ill lower the compression (nessecary for higher boosts) and i'd need ahone anyway, so may as well go the cbr pistons coz its easy to get forged and what have you, whersas my poor zxr tends to be a bit more on the exotic side of the parts list... ;L

this is all in the long run project btw, probably mid-2014 when its done, as i need a worksop that ISNT back in nelson!!!! (and a pay rise )

[ducatilover]

That won't put boost pressure to the bowls.

Where are you getting the forged pistons from? I've seen pistons for MC22s recently but haven't found a set of Jap made ones for an MC19 for yonks

Having a work shop is nice
This all makes me want to start another turbo project. I used to have a t25 floating around but I think I sold it my little Kawasaki is gagging for one.

[the bear zxr]

That won't put boost pressure to the bowls.

Where are you getting the forged pistons from? I've seen pistons for MC22s recently but haven't found a set of Jap made ones for an MC19 for yonks

Having a work shop is nice
This all makes me want to start another turbo project. I used to have a t25 floating around but I think I sold it my little Kawasaki is gagging for one.

I still don't see why people bag the whole "250 turbo" idea, If youv ever felt the exhaust gasses form a zxr or some similar high revving bike, they have a pretty good amount of smack. not to mention that mathamatically; they put out the same sort of gas volume as a 1ltr odd car, but at velocities much higher, in reality, the rpm ratio (i.e. a zxr redline is 19.5krpm, and a vw golf say; is around 6.5ish....(?) ) then you have a relitively high similarity, PLUS that higher velocity... all in all, there is no reason for it to be cost ineffective; the bikes are cheap and the turbos are cheaper. ofcourse one can argue that the cost of legalising such a mod is prohibitive... but realistically: if your going to do it, its either for the track and a laugh; or your the kind of person that doesnt give a shit anyways......

[ducatilover]

I still don't see why people bag the whole "250 turbo" idea, If youv ever felt the exhaust gasses form a zxr or some similar high revving bike, they have a pretty good amount of smack.

I've done one myself and set up a few small turbo motors, I like 'em

not to mention that mathamatically; they put out the same sort of gas volume as a 1ltr odd car, but at velocities much higher, in reality, the rpm ratio (i.e. a zxr redline is 19.5krpm, and a vw golf say; is around 6.5ish....(?) ) then you have a relitively high similarity, PLUS that higher velocity... all in all, there is no reason for it to be cost ineffective; the bikes are cheap and the turbos are cheaper. ofcourse one can argue that the cost of legalising such a mod is prohibitive... but realistically: if your going to do it, its either for the track and a laugh;.

They don't flow as much as you'd like to think, but they do flow more than most give them credit for. Legal? Meh that's for sheeple

or your the kind of person that doesnt give a shit anyways......

Essentially the reason I do anything
I am very interested in the forged pistons though, who supplies MC19 ones these days?
I believe MC22 ran a smaller gudgeon pin and a higher comp height and different crown on the piston? Or I may have the gudgeon backwards? (I had a GF like that once...)

But as a said before, I don't know anything, I just own a GN and post on KB (automatically makes you an idiot)

[the bear zxr]

and ebay has had a few mc19 sets pop up (japanese not chinese crap) im sure also that my local (boyle kawasaki) could find me forgies if anybody could!!!!

[unstuck]

But as a said before, I don't know anything, I just own a GN and post on KB (automatically makes you an idiot)

Dont beat yourself up, you cant help the fact that you have poor taste in bikes.

I want to hear this thing running.