Turbo 4-stroke 125cc engine
 

For my engineering tech project for school we are going to turbocharge a 125cc mini bike, thought it might be fun. I have seen a few threads on here and have searched through them but i cant seem to find a turbo small enough. Because its for a tech project we have to get the proper seized turbo and justify it with all of the calculations and that bs. I called garret and they said they have nothing and i called turbonetics and they said try a garrett haha. But i remeber a while back see a picture of a couple turbos next to pop cans and they were really small, they looked about the right size for this project, so im just wondering if anyone knows about the pic that i am talking about, and what they are called, so i can then get the compressor maps and figure out which one i need. Dont recommend any car turbos because they are all too big and this need to be done "properly" to get a pass. here is a similar bike that we are going to be working on

http://cgi.ebay.ca/Other-Makes-POCKE...QQcmdZViewItem

Re: Turbo 4-stroke 125cc engine
 

ihi turbos, and some kkk turbos are ultra small. like from 3000gt's.

Re: Turbo 4-stroke 125cc engine
 

yeah try the ihi turbos have seen some really small ones but not sure kkk turbos oh and def post pics this should be a cooll project

Re: Turbo 4-stroke 125cc engine
 

Ask Frank to look around in some of the Jap yards or one of the Euro guys since alot of jap and euro small eco cars use tiny engines with tiny turbo's. IHI will probably be what you end up with for the maker of the turbo.

Re: Turbo 4-stroke 125cc engine
 

Yeah i have been calling arround, and it seems that the IHI RHB3 is the smallest of them all, the problem is that IHI does not like dealing with aftermarket customers and for that reason i can find a compressor map for the thing. Anyone know where i can find one??? im not sure if if these come stock on any vehicles, but if anyone overseas wants to take a look for me it would be greatly appreciated, i cant see these turbos being in that great demand seeings as they are so small. i think im also gonna have to slap a few hmt stickets on the bike

Re: Turbo 4-stroke 125cc engine
 

PM Junkyard racer and Frank could probably find you a testicle sized snail and won't be that expensive either like if you bought one from IHI or any other company and pay retail and miniature turbo's aren't cheap either.

Re: Turbo 4-stroke 125cc engine
 

Yeah thanks, im Pm'd him, ANY ONE ELSE WHO LIVES OVER SEAS FEEL FREE TO LET ME KNOW IF YOU MIGHT HAVE SOMETHING LIKE THIS!! :y

Re: Turbo 4-stroke 125cc engine - any one who lives over seas read
 

Does anybody know about that pic with the turbos beside a coke can that im talking about???

Re: Turbo 4-stroke 125cc engine
 

I'm not sure the pic you're talking about. But a KKK off a 1.8T volkswagen should be fine the inlet is tiny like the size of a quarter. That motor would spool it easy. B20Accord and I turbo'ed a go kart that has a 8hp four stroke tecumseh roto tiller motor using a Td04 off a wrx and that motor made boost at the top end. That turbo is also bigger than the KKK. That 1.8T turbo should do fine.

Re: Turbo 4-stroke 125cc engine
 

I think this is what your looking for...


http://www.mjmturbos.com/images/SMALLEST.jpg

Re: Turbo 4-stroke 125cc engine
 

I doubt it, my buddy has a 1.8t and while they are small it hits fully boost at like 3000 rpm, and this thing is 14 times smaller and only puts out 9 lb/min mass flow so im prety sure we could try all day long and it would not work, i want a really small turbo that is gonna build boost prety soon and hold it, not something that is gonna hit at like 7000 rpm, and like i said i cant just throw any turbo on i have to give mathmatical reason for choosing a certain turbo, and therefore have to chose the proper turbo for the application.

Re: Turbo 4-stroke 125cc engine
 

YES! that is the one, thanks!

This is what i am looking for, something like the smallest one on this page, anybody know where a used one might be found or possibly what they came stock on?

Re: Turbo 4-stroke 125cc engine
 

Do It on a decent bike with a trans and a clutch

Re: Turbo 4-stroke 125cc engine
 

i called one place and they said that their manual clutch wouldnt hold up to the boost and would just rip out, but im gonne see if a local guy can build a manual one, either way im not looking for anything special its more the fact that the project is turboing it than it being a sweet bike

Re: Turbo 4-stroke 125cc engine
 

doesnt turbonetics make a really tiny turbo??..i know some aftermarket turbo company does i just cant remember

Re: Turbo 4-stroke 125cc engine
 

If anyone knows where to find a turbo like the smallest one in the above pic, or if anyone has one let me know 8)

Re: Turbo 4-stroke 125cc engine
 

They may have, but not any more, i called turbonetics and asked and they told me to use the garrett t12, but that thing is too big

Re: Turbo 4-stroke 125cc engine
 

Re: Turbo 4-stroke 125cc engine
 

they come off of the smart cars turbo version

the manifold is molded into the turbo housing itself

they pop up on ebay from time to time..

http://img77.imageshack.us/img77/616...36424hk0jv.jpg

Re: Turbo 4-stroke 125cc engine
 

its a small turbo, but i think its too big for this application i dont think it will fit, not to mention that manifold would be a pain to take off and put something else back on, cast blows....

Re: Turbo 4-stroke 125cc engine
 

whats his name.. damien.. had a boosted lawn mower projecct he posted up here..
ill see if i can find it..

Re: Turbo 4-stroke 125cc engine
 

thread here..
https://www.homemadeturbo.com/forum/...hp?topic=56269

damiens post here..
https://www.homemadeturbo.com/forum/...7746#msg647746

the kkk kp31 is alot smaller than the 3kgt turbo..

didnt stealthmode weld up casting with no problem?

Re: Turbo 4-stroke 125cc engine
 

Think dirt bike, and if you think cutting a manifold is a pain you should really give up now :-\

Re: Turbo 4-stroke 125cc engine
 

Yeah, i wonder how big that mower engine is, i still think the kkk might be a bit too big tho im prety srue its the same size as the garrett gt12, and welding cast to mild just seems so wrong and will probably be frowned upon when i present it

Re: Turbo 4-stroke 125cc engine
 

not cutting it, welding mild steel up to it, it isnt the smartest ting to do and it looks like ----, its my final project before i graduate not just something for kicks, so its gotta look good

Re: Turbo 4-stroke 125cc engine
 

So the only thing you care about is that the bike has a turbo instead of if it being something useable? ??? This is a stupid project that has nothing to do with engineering if thats the case. :3

Re: Turbo 4-stroke 125cc engine
 

i want one of those coke can sized turbos on my 12:1 c/r y8. it'd be like anti-lag for an all motor automatic. :1

Re: Turbo 4-stroke 125cc engine
 

no It would choke your motor and probably not rev past 3k

Re: Turbo 4-stroke 125cc engine
 

NO, it has to work, but im not concerned wether i can change the gears or not

Re: Turbo 4-stroke 125cc engine
 

i want to build a bridge. ill build the bridge. but it can barely support its own weight.. so it wont even support a person walking across it.. but its a bridge and i build it. so im not concerned as to weather it will support any weight and serve its purpose.. i built the bride after all.. thats all i was supposed to do :1

Re: Turbo 4-stroke 125cc engine
 

whats the difference between an auto and manual tranny? i am doing this becuase the project has to be on a system, i.e. for those of you who done get it, turbo charging the bike is the system, it could be a lawnmower, or a boat engine, or whatever the ---- you want, the point is, then engine is the system, the rest doesnt matter, which is why i dont care, i picked a bike because it would be more fun than just an engine, thats why, the project isnt the whole bike, GET IT YET??

Re: Turbo 4-stroke 125cc engine
 

Funny, I use KKK K03s turbo, this is small, but for a 125cc engine it is large..
I want to make boost to a scooter, it is only 50cc but the first problem is that, it is 2 stroke..
So I need a 4 stroke, 50cc cycle, and It will be supercharged... :)

Re: Turbo 4-stroke 125cc engine
 

Why is this a problem? I see it as nothing but an advantage.

Re: Turbo 4-stroke 125cc engine
 

2-strokes will flow 2x the exhaust as a four stroke. That makes up for it's smaller displacment.

I've read though that since 2-strokes burn thier lubricating oil, that makes exhaust gases cooler than that of a four-stroke = not good for spooling a turbo. I read it in a snowmobiling magazine, which is why factories never made a 2-stroke turbo sled. That's one of the disadvantages compared to a two stroke. But the fact that exhaust pulses every turn of the crank makes up for it.

50cc turbo scooter, or better yet moped would be badass O0

Re: Turbo 4-stroke 125cc engine
 

Thats 100% total bullshit. There are many good reasons why factories never produced racing turbo 2-stroke motor, that is definitely not one of them. A popular upgrade for rotary motors is to take off the oil injection and run premix. Does this mean that rotaries are shitty motors for turbos since they are burning lubricating oil? :l I can glow my expansion chambers cherry red to the silencers, EGT's being too low is not a problem. :-\


A word of advice, don't believe everything you read in those magazines, we even used to have an emo kid on here who used to write for for Honda-Tuning.

Re: Turbo 4-stroke 125cc engine
 

a kkk kp31 just popped up, like i said steve welded cast no problems u said it urself its just to make it work,,

http://cgi.ebay.com/ebaymotors/1999-...spagenameZWDVW

Re: Turbo 4-stroke 125cc engine
 

Re: Turbo 4-stroke 125cc engine
 

Here's an IHI that I have in the collection:

http://www.hmt-tv.com/hmt/matt/DSC00944.JPG

http://www.hmt-tv.com/hmt/matt/DSC00941.JPG