Doing some turbo build research, best/easiest engine to use

[Jpich85]

I'm planning on hopefully trying to build a turbo bike for my next build but after reading through this section on the forum there's a lot to learn and figure out, 

I thought I'd start with the basics on what engine is best to use? I've read that some need welded cranks, forged pistons and different oil pump gears,

I don't have loads to spend on the build unfortunately so I want to ask what engine would be best to go for that would need minimal modifications? I don't want mega bhp as I'm not doing it for that, I'm just looking for the challenge and having a little fun at the end of the build actually works lol

From what I've read below 200bhp seems to be on the lower end compared to some of your guys bikes. 

I'm thinking a bandit 1200 maybe?

I want it to be safe too and not worry that something might go bang so if the engine modifications are needed then I will do them.

I do have two 750 engines but I'm guessing they would be no good and not strong enough for a turbo

[Gixer1460]

Bandit is an obvious choice - cheap, reliable and suited for forced induction although some mods are required. Although some people have run low boost with std. pistons its not a given they will survive - easiest option is mk1 Busa pistons that take engine out to 1216 and with a little piston prep make good turbo pistons. Other than that a good working set of 36mm carbs will suit - don't buy cos they are cheap as you'll be forever rebuilding them and chasing problems. A good programmable ignition is useful but not essential. Allow £1k if you have an engine, £1500+ if you don't. You'll maybe spend more!

[clivegto]

As said b12 engine is a good choice, these are OK to around 180hp with no mods hardly. But I would recommend turbo pistons and a lock-up clutch. 

[Jpich85]

Cheers guys I appreciate the advice, I'm tempted to just try and get a whole bandit donors bike and then maybe sell off what I don't need then try and put the bits onto a gsxr frame, would you guys recommend a carb set up or go injection? I think I'd rather stay cards if I can. 

Also I see people mentioning about intercoolers? Is that a separate rad maybe for the turbo oil circuit?

[clivegto]

For a simple setup you don't need a intercooler (cooler air). Mk1 B12 carbs are easy to setup for turbo use. 

[Jpich85]

Cheers clivegto, I know there's a lot of work involved in a project like this but roughly the things and parts I'd need would be...

Bandit 12 engine with Bandit 12 carbs.

Turbo parts

Scaveng pump

Lock up clutch 

Fuel pump

And obviously the bike lol. 

Do I need any sort of extra electronics or ecu? Or just standard b12.

Is there anything I've missed other than a lot of time and effort lol

[Captain Chaos]

Fuel pressure regulator

O2 sensor and gauge

Edited December 8, 2020 by Captain Chaos

[Jpich85]

Thanks captain I appreciate your help, what would the 02 sensor do and where do they usually go? 

Oh yeah lol I forgot about the gauge.

What about any extra electronics? Do I need one of those fancy ignition units?

[mikeyd]

No ignition under 7-8 lbs of boost. Maybe higher octane fuel though.

[Gixer1460]

Lots and lots of reading and research as some of your questions are quite naive! May sound harsh but we aren't going to answer every simple question!

[Jpich85]

That's fair enough 1460, I have been doing lots of research so far but there's always a few pieces to the puzzle that sometimes seem hard to find, I don't know anything about turbos but I'm keen to learn. 

[no class]

there has got to be at least 100 turbo projects on this great forum if not more..... read every single one from start to finish.... this will shed some light on your quest for info and can be quite entertaining 

[clivegto]

he's right you know. 

[clivegto]

3 hours ago, mikeyd said:

No ignition under 7-8 lbs of boost. Maybe higher octane fuel though.

I run just short of 16psi on pump gas with standard b12 ignition. Done thousands of miles on it now over the last 3 years, No Problemo, so far. 

[Jpich85]

Lol I will do @no class, I looked into more and some people don't use o2 sensors by the looks, I'm guessing they maybe only used in injection fueling as carbs are just carbs you have to adjust them manually with the right jets 

Cheers clivegto 

Edited December 8, 2020 by Jpich85

[Gixer1460]

You still need to know which way and likely how much to change - a wideband can give that info. A dyno tune is generally required for a turbo build and they will deffo use a wideband lambda - so if nothing else, include a lambda port in the exhaust !

[Jpich85]

I see what you mean 1460 I guess you need a base point to work from, i looked further and found that the wide band sensors actually come with their own independent reader so that gives me the answers I needed lol, I thought it was something that plugs into the bike wiring loom like in cars so that was my dummy mistake, I will definitely want one of these then as it'll give you a good idea and what the mix is like. 

I also found out now what 14:1 means lol. 

 

[clivegto]

@Jpich85just get on & have a go it's the best way to learn, if you get stuck just ask. I even fitted hayabusa pistons the rong way roud and did 50 miles like this until it was pointed out on hear from a pic in my projection thread.  

[Jpich85]

Lol sounds like something they I'd do clive, yeah I think they the best way, I just needed to know what parts I'd need, I think I got a better idea now though thanks to you guys, looking forward to making the manifold and plenum though, looks like my sort of thing

[Duckndive]

Dinosaur Style ...1100k motor, Blandit block with Prepped Gen 1 Busa Pistons...T3 Draw Thru with Ditch Pump carb ..

Always Abused on Super Pi55 has seen silly PSI "wastegate fail" Just Do it and make some noise  248 ish BHP

Gratuitous Noisy Video...

 

[Jpich85]

Nice video duckndive those drag videos of yours look fast, I'm going to give it a try and hopefully make some noise at the end of it if it ends up firing up lol

[Captain Chaos]

14 hours ago, Duckndive said:

Gratuitous Noisy Video...

Damn.... now i also want a turbo on my black blandit-powered EFE

[clivegto]

1 hour ago, Captain Chaos said:

Damn.... now i also want a turbo on my black blandit-powered EFE

Do it 

[KATANAMANGLER]

5 hours ago, Captain Chaos said:

Damn.... now i also want a turbo on my black blandit-powered EFE

Of course you do...

[Captain Chaos]

I have €43,- in my bike fund. Should be possible.