Topic: Turbocharging a 75 750

[75SS]

Anyone ever Turbocharge a 750?  I got most everything plumbed but I haven t fired the engine yet.  My concern is fuel.  I have Supercharged a Small Block Chevy, but this is my first dabble into turbos.

I'll post pics later this evening.

[MRieck]

How much boost will you be running and what type of ignition system  will you be using?

[Sandcast 2356]

Alright, how much more power could you possibly want out of that baike. I dunno about you but I could turn 0-60 in under 5 on my $400 '69 that I got running a week ago.

[cben750f0]

mate you are a champ... love the look of the turbo'd 750's... though dont know much about it..... here is a pic of one i found on the net...peace

[75SS]

I am gonna be around4 psi, it is more for looks than horsepower.  I still have the factory ignition,  I am still looking into possibilitys.  I wanna make sure it functions properly and I wanna keep it reliable.

I know the turbo is a little large, it lags but it puts out about 4-5 psi with the 750.

[cben750f0]

A LITTLE LARGE .. DAYAM!!!... mate can you post a better pic... am really interested in a closer look... though i have to say i have seen smaller turbos on trucks!!! ... keep us in the loop.... peace

[Geeto67]

Where did you get that turbo? It is a might big and being mounted so far back you might have a lot of lag problems. YOu are correct in worring about the fuel as it looks like your fule has to travel a long distance uphill and may seperate from the air as it travels up the inlet tube. Most of the cars I see with inlet tubes that slope up are fuel injected and have the injectors at the intake ports. I think you need to replumb the system. Since it looks like you are building a chop I am sure you are familar www.hondachopper.com and wayne and sons. Wayne sells a log manifold that would be ideal for mounting a smaller turbo right up next to the engine. Mr. Turbo is still in business and can supply you with a rayjay turbo that is specifically for a bike application. I don't know what you are using for fuel mixing but old sporsters have a huge mukuni vm carb that might work (it is something rediculous like 40mm, most of them on jap bikes are 28mm-32mm). After that I would consider a single barrel carb off a small jap car or a 50's hotrod (like the old 1.2L hondas, an old solex, an old holley 94 or stromberg 97). If you scour the swap meets you might be able to find an old turbo kit from Mrturbo for the SOHC cb750 (and they pop up on ebay every once in a while), and save yourself the hassle, although I have to give ya a big thumbs up for trying to build one yourself.

BTW, how are you feeding oil to that turbo? 

[MRieck]

I don't know- I think you will have big problems too. The turbo is so far away from the head you are going to lose alot of exhaust velocity and heat. It will not spool up well especially considering the size of the unit. But hey- go for it...it's your bike

[cb650]

FYI I read in a article on the turbo 500 (CX/GL ??)  honda was thinkin on doin the 650 or 500
 but went with the liquid cooled 500.   Would love to get some of the r&d if existed.


                     Terry

[SteveD CB500F]

You're right Terry.  It was in Classic Motorcycle Mechanics (UK).  They tested the CX500 Turbo and mentioned that Honda had chosen that model because of the water cooling (the Goldwing was the only other w/c Honda in those days)

[cb750_chris]

Is a fuel pump needed?  I have seen a few on E-bay taken out of GSX-r's.  I think they go in the tank some how though. 

You'r a braver man than me putting all that together from pieces parts.  If it didn't come in a kit all neat and tidy I'd be at a loss. 

[057 adnoh]

I built a turbocharged 1972 cb 750 In 1974 the turbo was a ray jay , the exhaust and intake were made by magnum manufactoring I rode the bike on the street  and took it to the drags twice 11.1   126 mph with a street tire .  1st gear felt like a stocker, second gear got interesting near red line , third your shoulders hurt ,and fourth it would wheely  if you hit any kind of bump. The top end which I tried once was the speedo and tach reading ND (straight down ) . I sold it to a fellow who got wheel spin passing a truck at 60 mph; the bike was totalled.  Build a nice stock cb 750 and enjoy !! If you must go fast by a busa  ;

[cben750f0]

AND TURBO THAT!!!! .... ..peace

[noelocol]

Hey Gents...
I have a 1975 cb 750f with a Honda dealer installed RayJay Turbo, done back in 75.
The bike had 18000 miles and was a beautiful orange metal flake.
I'm turning her into a cafe racer, and planning to pull off the Turbo kit and bringer her back to stock.

If you want some pics of the bike to see how its set up let me know!

Noel
noelocol@rogers.com

[medic09]

Hey Gents...
I have a 1975 cb 750f with a Honda dealer installed RayJay Turbo, done back in 75.
The bike had 18000 miles and was a beautiful orange metal flake.
I'm turning her into a cafe racer, and planning to pull off the Turbo kit and bringer her back to stock.

If you want some pics of the bike to see how its set up let me know!

Noel
noelocol@rogers.com

Have you ever known a time when folks here did *not* want pics? 

We're waiting...

[736cc]

Owning a turbo motorcycle is fun.
http://www.turbomotorcycles.org/TMIOA/TMIOA.html
navigate the site, its all about boost. BTW, my XN85 is for sale. Fuel-injected, monoshock, factory original. Its mint.