cg250cc mini trike turbo update! finally on,
 

Hi all after a bit of advice im wanting to get as much power as i can out of a zonshen 250cc have been thinking i mightdo a drawthrough carby turbo.
I have just finished cleaning up the motor to replace the tired 200cc lifan i have in it but really want to get the most out the cg250
So any advice to squeeze some extra power would b great

Greetings!
 

Welcome to the forum! Nice trike! Way to start with pictures! Is it me or is that like an adult version of a Big Wheel?!? Ok, adult is probably not the correct word to use. Calling most of us “adults” is...well...yeah, you get the idea!

Ok, back to the “older” person Big Wheel! That is so awesome! I know we usually ask for pictures, but this deserves a YouTube video!!!

I can’t really help you with the turbo, but I’m sure some of the other members can.

Enjoy the Ride!

That looks like a lot of fun .

Thanks guys been a labour of love building this over the past 3-4 years, adding bits and improving what i can.

Ill try find a video for u so u get to see how small it really is but still gets up and moves, have got 83km/h out of it on dirt in third but ran out of space to wind it up any more

looks cool! there is a turbo thread in the dual sport section but i do not think anyone has tried it. if you figure it out let us know.

So far im planning on getting a tunable cdi so i can avance the timing if need be
will b running a 34mm makuni carb with adjustable needle and set the jets
Will also b running a air/fuel gauge with warning light to ensure i dont run it to lean
i will have a separate oil tank with pump and oil cooler so i dont risk starving the motor of oil and ill run the pump on a timer like a turbo timer so it continues to pump oil round after the motor is stopped to cool down the turbo and get excess temp out
Will start off at low psi round 4psi and wind up from there
All this together and a propper dyno tune before i ride it should hopefully keep it from blowing up fingers crossed!!!

The crankshaft is pressed together from my understanding. If that is true, you won't get much pressure in the engine before the crankshaft separates. I've seen quite a few failed pistons in these engines that are run in the Bobber. That would be the next weak link.

Honestly, that first picture made the hair on my arms stand up.
It looks like a jockey shift and a hand clutch; is that right?

Why is the front brake caliper on the opposite side?

Yeah its a suicide shift clutch to take off just slam gears lol

Thank u for that ill look into it further

Gd spoting, was wondering if anyone would pick that up lol
im changing the bottom mounts on the shocks and just sat it together to get it mobile. bloody things have corroded themselves on there rather well

Do you plan to engineer a foot clutch?

Nah not at all if i was going to chsnge vfb the clutchni would put it on the suicide shifter

looks like a very fun project... i built this about 6 yrs ago now.... was a hoot to ride.... had an old honda 75cc engine in it....

https://www.youtube.com/watch?v=nqYWY3yVTQw

That is badass, sir. Welcome

Heres so updated pictures of the work thats been done, replaced and painted basically everything on the front end.
New shocks on there way and tank off to be painted before frame gets rebuilt and powdercoated

Few more

Well turbo is finally here, working out mock up piping, oil tankand fuel and oil pumps. Once im happy with piping ill get it mandel bent and start welding it. Then it will b heat wrapped

Yup bad ass! welcome!

Do you have a link to the turbo you purchased ?. Thinking about something like that for my TBR7 not so much for the power but for altitude compensation as i'm riding between 6 and 8000ft. i think it takes about 3 psi to get to the equivalent of sea level which should be fine.

If I had to guess, it is an IHI RHB31 VZ21, or a copy of one. Pretty much the smallest production turbocharger on the market. They can support up to a max of 100hp, and run on engines down to about 125cc.

Your the man:tup: Thanks for the info. Also i have been following your updates on your black hawk ( not your helicopter , as i think you'll post details on that later :hmm::hehe:) . Nice to see what you have done and the reasons your doing things, Please keep us updated on the chain tensioner as in how it helps or not and how it holds up. Thanks again Megadan.

Yes as stated, its a vz21 turbo. These turbos run 7psi stock.
I have been doing alot of research and have decided to go blow through carb set up as most people could see by the pics. This requires the fuel bowl to b equally pressurized equal to boost pressure. Also needs your bowl vent in inlet side of carb to b blocked off or fuel will flood out of it

Few updates of the mock dump pipe and screamer pipe

I noticed the straight axle, how does it turn? Do you do sweet doughnuts with it?!

The straight axle turns great on dirt. Really doesn't cause it any troubles at all. Ive had it on hard surfaces and it turns almost aswell.
Oh yeah does make for good donuts does them in second

Would you be so kind as to give us a turbo carb prep tutorial? Pics of the necessary mods would be most helpful. Thanks!

No a problem, be more than willing to show u all how it goes together. Will b a while till i have all the necessary bits all plumbed and wired for this and need to finish all the frame with mounts and get it powder coated.
Might even dyno it for a laugh

Well made a bit of progress on the weekend.
Made a reducer to go from turbo to carby
Polished compressor housing
Tacked up carby manifold ready for welding
Got all pipe work in right place and tacked so now can go down and get it all mandrel bent
Ordered black stainless braided lines and connections and mocked up where they will run
And decided on placement for filter, battery, oil pump, oil cooler and accelerator cable of course cable needs shortening and a 90° bend into top of carb.

Hi been busy polishing up parts, doing all fuel lines, filter and an4 braided lines. Tank should b back this week and i can make sure everything is clean and then weld up all the engine mounts etc

That rake is so awesome!
I'm really looking forward to your carb prep tutorial; that's knowledge I've been seeking for awhile.
What size is the front tire? Where did you find it?

The front is a 17inch. Was hard to find the white wall tyre was lucky they had some old stock

Is this planned to be for show or off road only? Just asking because I've worked on probably 100 or so trikes, and with that rake, and lack of a rear differential, it'll take some gorilla like arms to get that thing around a turn, especially on the street, unless you're planning on lifting a wheel. Most higher end trike kits decrease the rake closer to vertical, so that it has okay turn in.

The rake really isnt that bad just looks like it the way the frame steps back throws your eye out. Its going to mainly be for sand drags.
Ive had it running before with the 200 in it and it turns and handles really well and slides well lol

Few pics of the new polished turbo sitting in place. Still waiting on tank to get final placement of everything but this is close to where it will all go.
Waiting on a m10x1.0 tape for the oil inlet of the turbo so once thst arrives i can mock up oil lines and check im getting sufficient oil flow round the system before welding up the oil tank.

What is a m10x1.0 tape?

i am guessing thye meant TAP....LOL :hehe: autocorrect can be a bitch sometimes...

Oh man, I tried to figure out various combinations of letters, but I didn't think of dropping a letter. Honestly, the simplest things can escape me sometimes.

I would also guess that the steering is going to be much easier for the simple fact that this thing probably weighs half to a third of what a typical Trike does.