Author Topic: Old Skool Turbo CB750  (Read 43471 times)

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Offline voxonda

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Re: Old Skool Turbo CB750
« Reply #50 on: October 05, 2008, 12:35:18 PM »
Thanks Tom,

If this exercise works maybe I'll take it one step further and build one with EFI. Know where to find you. ;D

Cheers.
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Offline dusterdude

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Re: Old Skool Turbo CB750
« Reply #51 on: October 06, 2008, 01:47:05 PM »
voxonda,i hate for you to have the idea the super e carb is race only,actually it is a very good street carb,i have one on my panhead and would never part with it.btw,cool build
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Offline voxonda

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Re: Old Skool Turbo CB750
« Reply #52 on: October 06, 2008, 02:09:39 PM »
Hey dusterdude,

My remark about the carb is not based on my own experience, but on what others told me. I was more or less adviced to go for the Mikuni. Looked like a safe bet.

Cheer, Rob
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Offline voxonda

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Re: Old Skool Turbo CB750
« Reply #53 on: October 10, 2008, 08:59:44 AM »
Today found some time to begin with the header, so far:


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Offline kmart550

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Re: Old Skool Turbo CB750
« Reply #54 on: October 10, 2008, 04:55:22 PM »
Love that front wheel, what is that off of? 
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Offline voxonda

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Re: Old Skool Turbo CB750
« Reply #55 on: October 10, 2008, 11:33:26 PM »
Love that front wheel, what is that off of? 

It is a Kim-Tap after market wheel. Hoping to find a rear wheel one fine day. Own it for some 25 years now.

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Offline voxonda

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Re: Old Skool Turbo CB750
« Reply #56 on: October 11, 2008, 07:35:18 AM »
In order to keep more or less the same length for the individual pipes decided to reroute the pipes, before tackweld them in place I use the 'tape-method'.


Shape of cyl.2 is directed by these three.

So far, I am happy with the result.
« Last Edit: October 11, 2008, 07:44:24 AM by voxonda »
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Offline ColinMc

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Re: Old Skool Turbo CB750
« Reply #57 on: October 11, 2008, 09:41:13 AM »
Looking good! Now take a break and eat some delicious stroopwafels. Warmed up of course! Man I miss Dutch food!
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Offline voxonda

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Re: Old Skool Turbo CB750
« Reply #58 on: October 11, 2008, 04:12:39 PM »
Looking good! Now take a break and eat some delicious stroopwafels. Warmed up of course! Man I miss Dutch food!

Thanks, if it comes to that, will sent you some stroopwafels!

Cheers mate.
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Offline 754

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Re: Old Skool Turbo CB750
« Reply #59 on: October 11, 2008, 10:53:13 PM »
It is a Kim-Tab snowflake mag. They were used on a stock 340 Rotax for a year or two.

Vox, I would not worry as much about equal leghth as getting it done and a good fit, mine are from magnum turbo  and the collector is on the side. (think you can see them if you dig up the Bonneville 07 thread). I am not running turbo, just like the look  and ground clearance.

Your first pic looks like the R.C. Engineering style..
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It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline voxonda

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Re: Old Skool Turbo CB750
« Reply #60 on: October 12, 2008, 02:54:40 AM »
Really like that header of yours! Is that still available?

Cheers, Rob
« Last Edit: October 12, 2008, 04:40:55 AM by voxonda »
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Offline 754

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Re: Old Skool Turbo CB750
« Reply #61 on: October 12, 2008, 09:13:46 PM »
No way, it really makes the bike have a whole different look..
 I have only seen other that used same for non turbo use.

Pipe was designed to be slipfit at the collecter joint beside the cylinder, but we added a 3bolt flange, not totaly necessary bit looks cool
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline voxonda

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Re: Old Skool Turbo CB750
« Reply #62 on: October 13, 2008, 12:35:52 AM »
Looks cool on a scrambler-type 750 I guess, well............maybe will make my own one then.

Cheers, Rob
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Offline Gregorymoto

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Re: Old Skool Turbo CB750
« Reply #63 on: October 13, 2008, 04:59:45 AM »
NICE
Yep, i have issues with this sort of stuff.

Offline voxonda

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Re: Old Skool Turbo CB750
« Reply #64 on: October 15, 2008, 09:26:05 AM »
Finally found time to finish the oilcoolerconnections and mount a VFR screw-on filter:

Think it looks nice.
Also came across a more serious problem, the (internal) waste-gate valve sits too low and interfers with the oil-returnline. Think I need to close up the internal wastegate and mount a external one. Anyone done this closing up?


Cheers.
Better sorry for failing then for the lack of trying.

Offline HondaMan

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Re: Old Skool Turbo CB750
« Reply #65 on: October 17, 2008, 08:07:40 PM »
Man, that's gotta be the BIGGEST turbo I've ever seen on a 750.  :o

The one I knew here in Denver, on a K4, was about as big as my fist, 5 PSI boost max. It was like yours, sucking the carb through the turbo. It was a 40mm Mikuni with jets the owner drilled himself, and an intake manifold made of smallish round tubing: his idea was that since it was boosted, the intake tract size wasn't all that important. I only got involved because he would run low on fuel in the float bowl after a few seconds of on-boost run (about 1/4 of the way down the track). We ended up fitting a small fuel pump with a bypass relief valve right at the carb, set at 4 PSI (I think), from a snowmobile, if I remember right. It got him into the 10s, too, so he was doing something right.

Then there was the one on the CBX I saw at Bandimere's strip one night: it was about the size of yours. The exhaust ran right in front of the timing plate, so the owner made (had made, actually) a very expensive billet piece with a drive and sprockets to raise the ignition up alongside the engine's fins. Then he used POINTS and a points cam! Man, that CBX was one track-burning streak, too, with beautiful fittings everywhere and even chromed piping. Rumor has it this bike is in Hudson, CO today.
Two of his buddies rode a pair of identical CBXs around here on Saturday nights (they used to work at the old Fay Myers on Alameda, for you Denverites), smoking the rear tires just for fun!

I hope you get it running: what a blast it will be!
« Last Edit: October 18, 2008, 07:34:26 AM by HondaMan »
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Offline 754

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Re: Old Skool Turbo CB750
« Reply #66 on: October 17, 2008, 08:40:59 PM »
Around 80 or 81 them guys from Twin Cities or Minneapolis brought a Hotted CBX to Sturgis.. it had a 6 inch wrinkle wall on the back...

 In front of City park when he got on it, it would sometimes break loose in 3rd gear.. :o. at around 80-85 mph..!!


 Back in those days the racing was still in Belle Fourche.. and he ran it there first time out on the track... 10.10.. that was pretty quick back in 81..

 Around that time Alan Peterson fro Des Moine I think would ride his hot Sporty on the street.. with a Magnuson blower and Fuel injection.. big mother Hilborn toilet on the side.. :o.. and it was running alcohol...

 When he did a burnout in town.. you could clearly hear it in City Park.. at least a mile away!1.. and it would sound like a fuel car..


 Ah the good old days..
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline voxonda

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Re: Old Skool Turbo CB750
« Reply #67 on: October 18, 2008, 04:38:06 AM »
Well, all I try to do is bring a little bid of the old days back! Actually the turbo is not that big, think the pic fools a bid. It is a Airesearch/GarrettT2. Think the problem with the, too, small intaketrack is that the airvelocity is increased and so, tru the jet, the floatbowl is emptied faster than gravity can fill the bowl up.
I am very dedicated to get this beast running, and it will!!!!!!!!!!!

Cheers, Rob
Better sorry for failing then for the lack of trying.

Offline Soos

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Re: Old Skool Turbo CB750
« Reply #68 on: October 18, 2008, 07:02:52 AM »
Has anyone ever tried running with a deeper or wider float bowl to help with the gas reserve held in the carbs?

Or perhaps pressurizing the gas tank?
The boost could determine the level of pressure in the tank perhaps, so as the boost increases the pressure increases to offset the gas draw through the carb.
Not too sure how the mechanics of that setup would work...

But if you can fabricate up a custom turbo setup, you might be a bit smarter than me and be able to figure it out.


Not that i have ever worked on a turbo'ed car or bike... just my normal rambling thoughts....



Any way... COOL setup!


l8r

P.S. hondaman... you REALLY make me wish I hadn't left denver, you know that?
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Offline fishhead

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Re: Old Skool Turbo CB750
« Reply #69 on: October 18, 2008, 07:26:24 AM »

Also came across a more serious problem, the (internal) waste-gate valve sits too low and interfers with the oil-returnline. Think I need to close up the internal wastegate and mount a external one. Anyone done this closing up?


Cheers.

Not familiar with the Airesearch/GarrettT2 turbo, but more familiar with the Rajay turbos. On the Rajays, the intake and exhaust turbo housings can be spun seperately to eliminate most interferance (ie-the intake housing can remain in the same orientation, while the exhaust housing can be turned for needed clearance). Can it be done on with the Garrett?
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Offline HondaMan

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Re: Old Skool Turbo CB750
« Reply #70 on: October 18, 2008, 07:49:31 AM »
Or perhaps pressurizing the gas tank?

P.S. hondaman... you REALLY make me wish I hadn't left denver, you know that?

I'm afraid that pressurizing the (stock) tank is illegal on the street and the track, both. I found that out on the above-mentioned 750. We didn't know, until after it was working, that it wasn't allowed.  :(

Believe me, Soos, you're better off, being away from this city. It's become so much like the big cities of the Midwest that I left in the 1970s that I'm looking to go elsewhere as soon as I can. I love Colorado more than any of the other 16 States where I've lived, but I've had it with the theft, the illegals and their driving (they murdered 11 people in Lakewood this last year with their vehicles: no license, no insurance, and NO LAW ENFORCEMENT RETALIATION), and the politics of this state, now. The new Dem governor can't raise taxes because we passed TABOR (Taxpayer's Bill Of Rights) some years ago, so he's trying to do things like charge an extra $100 for every titled vehicle you own, every year, a "user's fee". And, at every election he has some sneaky bill added to the vote that sounds like he's going to be the Educator's Messiah, or the Builder of Great Highways - but it includes a clause to repeal TABOR, and forever, in the name of giving schools more money. My house taxes already raise my house payment 50% over the mortgage itself, it's that bad. And that is limited by the TABOR, too: it was rising about $100 every year before we got the TABOR through, by a landslide.
See SOHC4shop@gmail.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

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Offline voxonda

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Re: Old Skool Turbo CB750
« Reply #71 on: October 18, 2008, 09:24:43 AM »

Not familiar with the Airesearch/GarrettT2 turbo, but more familiar with the Rajay turbos. On the Rajays, the intake and exhaust turbo housings can be spun seperately to eliminate most interferance (ie-the intake housing can remain in the same orientation, while the exhaust housing can be turned for needed clearance). Can it be done on with the Garrett?

Hey fishhead,

Yes it can be spun seperately. But you need to take in consideration that you want the exhaust to be connected is a smooth as possible way. So you cannot spin that much. But I have managed to mount the valve without touching anything else. Just drilling a new hole and grinding some material off.


Cheers, Rob
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Offline voxonda

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Re: Old Skool Turbo CB750
« Reply #72 on: October 19, 2008, 08:42:05 AM »
Has anyone ever tried running with a deeper or wider float bowl to help with the gas reserve held in the carbs?

Any way... COOL setup!

l8r

Better and safer bet is to use a petrol pump. Downside is you have to create a returnline to the reservoir.

Cheers.
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Offline HavocTurbo

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Re: Old Skool Turbo CB750
« Reply #73 on: October 20, 2008, 12:35:36 AM »
Has anyone ever tried running with a deeper or wider float bowl to help with the gas reserve held in the carbs?

Any way... COOL setup!

l8r

Better and safer bet is to use a petrol pump. Downside is you have to create a returnline to the reservoir.

Cheers.

Get an inline pump from the summit racing catalog.... then an inline 1-3lb adjustable fuel pressure regulator.... weld yourself a return line bung on the bottom of the tank... PRESTO!!!

I'm afraid to say it but that's what we use on the mini pulling tractors. Works great at 1.5-2lbs pressure.
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Offline scartail

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Re: Old Skool Turbo CB750
« Reply #74 on: October 20, 2008, 06:44:53 PM »
I don't know if anyone had mentioned this. the drain for the cartridge (section section) shoud point down. the oil is gravity drained.

Speaking of drainage, how are you routing the oil lines?
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