turbo blaster

[cobrajames]

Ok. First of all. I know it will be difficult. I know it will be weird. But I want to do something no one has heard of. I dont care how practical it is, its just a fun factor. So no dogging my idea. I just want technical advise not opinions.

Now that thats out of the way. Here is my build so far.

Im putting a stock brand new cylinder on it because of bigger walls for durability.
A stock size, forged piston with a little extra ring gap for expansion.
I want to have the head milled a little for a little higher compression (going to run 120 octane race fuel)
Going to be running a 9 plug. My pipe is a fmf knockoff. Makes good mid to top end power

Turbo is going to be a 28mm inducer and 31mm exducer. Going to be set on as much psi as everything can handle.

Im converting over to dc power so I can run a fuel pump and return system for gas and a oil pumo with a reservior and cooler for the turbo.

My main question is the carburetor. Whats a good carb to run, and how would it have to be modified for boost. What size jet to start with etc.

The cylinder will get minor porting on the exhaust side with the intake side being left alone to huild boost faster.

If anyone has experience with boosting shees olease chime in.

 

[Blaaster]

I have limited knowledge with force fed induction systems but I am aware that one needs to lower the compression.

Are you planning to force the charge directly into the cylinder or are you planning to use the crankcase delivery system?

 

[cobrajames]

Im going to use the crankcase set up. Usually you would lower the compression to run boost but im going to use race gas and low psi (8-12) with high compression to get the same numbers as 20psi with low compression. Its harder on parts but since its all stock a rebuild every 20 hours or so isnt a big deal

 

[Blaaster]

My knowledge stops here.

There are some others on BF that have toyed with the idea, maybe someone will chime in.

 

[bansheedave]

I have seen some YouTube videos of it being done. It builds fast power for sure. Be aware of the pipe. If it's a slip fit pipe held with springs, your going to blow the expansion chamber off. It should be bolted on, no slip fit. That's about all I know. The other thing I believe I know, is the direct oil injection needs to be used I think.

 

[cobrajames]

See i know all about 4 strokes. Crotch rocket and car motors but nothing about fourwheelers. Whats the direct oil injection?

 

[bansheedave]

Blasters are injected factory for the oil. Auto lube. I think having it function along with a gas oil mix in the tank would be good. Don't want to wash the cylinder down on a 2 stroke. But again, I'm just guessing. To much oil can lean out a 2 stroke as well. I was looking up the subject myself with basic curiosity but new looked into it in full depth. I am tuning in to see what you find.

 

[blasterdemon7]

This has been done some years back with LOTS of problems. I don't think it ever got to a point where it would work good.

 

[Blaaster]

bansheedave mentioned about too much oil leaning out the mix.

This only applies to pre mix which has to pass through jets, where the oil takes the place of fuel.

Injecting oil post jet just adds lubrication.

 

[undergroundart]

I don't personally know much about turbos, but if I were you I would look on some snowmobile forums. they turbo 2 stroke motors. I would think it would be real similar to what you re doing. the main problem I see is the blaster being air cooled. putting a turbo on it might make it get real hot real fast

 

[cobrajames]

It will be tuned using a wideband. And if I run into cooling problems ill convert it over to alcohol to keep temps down.

 

[Herpderplol]

you start off by saying you want to do what no one else has done, then ask us for jetting and other things?

no offense, but i dont see how it adds up

now. it has been done once, there is a thread somewhere from 2008 or something. he blew up 1 or 2 turbos because he didnt turn his oil pump on (yeh, dumb he had a manual switch whatev)

first, you should start by getting your blaster to run good, and open up the intake and exhaust ports to allow the extra air a little more room & better flow
then slowly start experimenting with the turbo. get a good setup and route the tubing where it wont cause a problem while riding, but is durable also

i doubt you plan to trail ride this, dunes or road seems like a better place for this idea.

just keep in mind that it doesnt take much to mess up a blaster's engine. air leaks, no filter! etc.

is this a new OEM cylinder, or the $90 ebay sh*t everyone seems to be buying now?

 

[bansheedave]

 

[mud runner]

I'm tuned in

 

[cobrajames]

Im putting the turbo where the airbox is and routing the exhaust straight out the back. That also puts the intake right next to the carb. Im thinking I can run my fuel pressure boost referenced and use about a 450 main jet. Ill have to play with the jetting im sure.

 

[mud runner]

Somthing else I'd look into is if it'll build enough boost to blow the carb off of the intake boot