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Author Topic: Turbo Billet Block CB750  (Read 3838 times)

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Offline Cb750 Racer

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Re: Turbo Billet Block CB750
« Reply #50 on: January 02, 2019, 01:39:13 pm »
Cb750 racer here you go, both E and F Rajay maps, along with different blade design the E wheel and compressor are larger. It has been my experience that on a big Kawasaki the smaller F setup will make almost 300rwhp, I would guess the E to be good for roughly another 100hp.

Wow, Those Rajay "F" series compressor maps are like hens teeth. I really do appreciate you sharing this! I'd love to read more about some of your Kawasaki's. Sounds like a #$%*in stable!

Looks like I'll still be in peak efficiency with what the boost I plan on running which is awesome. I hope the backpreassure isnt too crazy but the norris stage 3 cam should really help keep it from making it to the combustion chamber.

Much more progress on the engine behind the scenes. Ended up having to ditch the MessnerMoto cam chin tensioner as there was no way to install due to cylinders 2 and 3 being too close together from the large sleeve OD. I posted further details on his thread. Now have one of those metal ?Cappenelli? Ebay tensioners in there now. Mike also shortened the cam chain back down to 94 links for the stock style unit





You can see engine #1 from AT&S creeping in the back of the picture. There's also so need to hold the cam chain up better off just dropping it in the cases so it's out of the way.


Dam that copper headgasket looks good. It was sprayed with that permatex copper spray a gasket for that extra level of sealing.


Also had to end up running stock head nuts due to me sinking in the studs too deep. I should have set them higher because the aftermarket head nuts are much taller but truthfully I don't think the difference will matter all that much. Mike also used 4 acorn nuts with copper washers for the studs that are exposed(410 series head) to prevent oil seepage outside of the engine through the threads.


This engine spins like butter
« Last Edit: January 02, 2019, 01:47:22 pm by Cb750 Racer »
1972 Honda CB750 AAMRR Racer
1972 Suzuki GT750 Project
1975 Honda CB400f
1981 Kawasaki KZ750 LTD
1984 Kawasaki GPZ550 =>610cc
1996 Honda CR500

Offline Bill/BentON Racing

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Re: Turbo Billet Block CB750
« Reply #51 on: January 07, 2019, 04:06:11 am »
Looking great. K. Tell Mike hello, a busy man rt there. ;D, Bill
BentON Racing Website
OEM Parts | Service | Custom Builds
BentON Racing Facebook
Over 35 years of experience working on vintage motorcycles, with a speciality in Honda SOHC/4 with a focus on the CB750 and other models as well from 1966 - 1985.
______________________________________
1993 HRC RS125 | 1984 NS400R | 1974 Honda CB750/836cc (Calendar Girl) | 1972 CB 500/550 Yoshi Kitted 590cc | 1965 Honda CB450 Black Bomber | 1972 Suzuki T350 | 1973 88cc | Z50/Falcons Pit Bike | 1967 CA100| 1974 CB350 (400F motor)...and more.
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See our latest build 'Captain Marvel' CLICK HERE

Offline PeWe

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Re: Turbo Billet Block CB750
« Reply #52 on: January 07, 2019, 11:16:46 am »
I use thinner washers with forged head nuts to get extra thread lenght. Kibblewhite studs that are tightened to bottom without any thread locker. Std DIN 6331 forged collar nuts.

I was thinking about grinding the bottom a little. But too much work, must be flat, 90 degrees rel thread...
I tightened 20.65 ft lbs (28Nm)

Good luck with the beautiful build.
CB750 K6-76 1005cc JMR Billet block.
CB750 K2-75 Parts assembled to stock K2

Offline Cb750 Racer

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Re: Turbo Billet Block CB750
« Reply #53 on: January 11, 2019, 12:30:43 pm »
Looking great. K. Tell Mike hello, a busy man rt there. ;D, Bill

No doubt he's killing it with all the cb750 builds. I'm suppose to be heading up to his place tomorrow i'll let him know! All the custom work for these builds has definitely put a damper on his free time but he's cranking out some kickass stuff.

I use thinner washers with forged head nuts to get extra thread lenght. Kibblewhite studs that are tightened to bottom without any thread locker. Std DIN 6331 forged collar nuts.

I was thinking about grinding the bottom a little. But too much work, must be flat, 90 degrees rel thread...
I tightened 20.65 ft lbs (28Nm)

Good luck with the beautiful build.


I really wish we had thinner washers on hand your solution came out beautifully. I had the same setup kibblewhite stud/nut combo. I think those stock head nuts will certainly be put to the test. Torqued to 21ft lbs. Mike said he got as much as another quarter turn when re-torquing the head after a few days.  The orings should be sunk into the copper head gasket after that  ;D. Good thing I waited another week for them to be checked again I definitely downplayed the importance of it.

The cam is in and safely degreed by the man himself. I won the jackpot of hardwelded cams. An extra 0.010 of lift on the intakes  :D




Finally got this baby home on Saturday. Alot has happend since then I really have to get some pictures I got the valve cover and oil pump/pan on the bike and finally got the engine in the frame. Man it looks outta this world with the cycle x exposed alternator. Ill get some photos soon. Hope Kenny is getting better

 
1972 Honda CB750 AAMRR Racer
1972 Suzuki GT750 Project
1975 Honda CB400f
1981 Kawasaki KZ750 LTD
1984 Kawasaki GPZ550 =>610cc
1996 Honda CR500

Offline Sam Green Racing

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Re: Turbo Billet Block CB750
« Reply #54 on: January 11, 2019, 04:01:02 pm »
Ahhhh, the one that is posted on Facebook. Looking good my friend.
C95 sprint bike.
CB95 hybrid race bike
CB95 race bike
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JMR Racing CB750A street ET drag bike

Offline Bill/BentON Racing

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Re: Turbo Billet Block CB750
« Reply #55 on: January 13, 2019, 09:45:20 am »
I'm checking on Kenny tomorrow. I'll update ya'll.
BentON Racing Website
OEM Parts | Service | Custom Builds
BentON Racing Facebook
Over 35 years of experience working on vintage motorcycles, with a speciality in Honda SOHC/4 with a focus on the CB750 and other models as well from 1966 - 1985.
______________________________________
1993 HRC RS125 | 1984 NS400R | 1974 Honda CB750/836cc (Calendar Girl) | 1972 CB 500/550 Yoshi Kitted 590cc | 1965 Honda CB450 Black Bomber | 1972 Suzuki T350 | 1973 88cc | Z50/Falcons Pit Bike | 1967 CA100| 1974 CB350 (400F motor)...and more.
______________________________________
See our latest build 'Captain Marvel' CLICK HERE

Offline Cb750 Racer

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Re: Turbo Billet Block CB750
« Reply #56 on: March 01, 2019, 01:13:22 pm »
I've spoken to Kenny a few times over the past few weeks. He's been steadily getting better which is awesome to hear!

Figured i'd post a few random photos that I never got around to posting. My buddy is currently starting the mock-up of the exhaust. He's been really busy these past few weeks between work and school. They're finishing a Sons of Speed boardtrack racer over at the shop he works for leading up to the race at Daytona. They're currently machining up a billet intake for the 1916 Indian powerplus engine. Really sick stuff I'm hoping to see it on the dyno once they finish up the final iteration of the billet intake and get the jetting sorted on the new carb. Crossing our fingers that it'll see 60hp but it's optimistic


The alternator rotor sits a but deeper than I would have thought.And when I removed the spacers the rotor ended up sitting proud of the alternator. I may end up just trimming the spacers if it ends up giving any problems with charging.







The bike won't see much love until after Daytona but then it's going to be full speed ahead. I'm hoping to have the bike riding by the end of April. Once the bike is basically complete I'm planning on having the frame chromed out and tank and seat repainted so everything is shiny once again.
1972 Honda CB750 AAMRR Racer
1972 Suzuki GT750 Project
1975 Honda CB400f
1981 Kawasaki KZ750 LTD
1984 Kawasaki GPZ550 =>610cc
1996 Honda CR500

Offline Cb750 Racer

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Re: Turbo Billet Block CB750
« Reply #57 on: June 13, 2019, 09:50:48 pm »
Little update, finally getting around to banging out the stainless exhaust and wiring,My buddy machined up some billet exhaust flanges and we're working our way back to the turbo now. I've been gallivanting around Europe for awhile its time to finally get this project finished up  ;D



We mounted the intake manifold using stock cb550 intake rubbers which turned out to be a perfect fit.



The plan is to have the manifold be a two piece setup so maintenance is a breeze



A billet turbo mount is in the works too as we don't want the exhaust to be weight bearing.Stay tuned for this piece it's gonna be something else  ;)
1972 Honda CB750 AAMRR Racer
1972 Suzuki GT750 Project
1975 Honda CB400f
1981 Kawasaki KZ750 LTD
1984 Kawasaki GPZ550 =>610cc
1996 Honda CR500

Offline andy750

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Re: Turbo Billet Block CB750
« Reply #58 on: June 14, 2019, 03:14:17 am »
This project just keeps on being an inspiration! Cant wait to see how it turns out.

Good luck!
Andy
Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico (CB750K4), 2003 - European Tour (CB750K4), 2004 - SOHC Easy Rider Trip (CB750K4), 2008 - Adirondack Tour 2-up (CB750K4) , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. VStrom DL1000 2003
4. XLR650L 2006

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline PeWe

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Re: Turbo Billet Block CB750
« Reply #59 on: June 14, 2019, 04:15:24 am »
No risk for speeding tickets!  The medallion guys in flashing vehicles must catch up for that ;)
CB750 K6-76 1005cc JMR Billet block.
CB750 K2-75 Parts assembled to stock K2

Offline Cb750 Racer

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Re: Turbo Billet Block CB750
« Reply #60 on: June 14, 2019, 02:12:56 pm »
This project just keeps on being an inspiration! Cant wait to see how it turns out.

Good luck!
Andy
Thank you Andy! I appreciate the kind words I wish updates were more frequent for you guys, but it's going to be on the road before the seasons out you can mark those words  ;)
No risk for speeding tickets!  The medallion guys in flashing vehicles must catch up for that ;)
You have the right idea PeWe  ;D I'm hoping the WTF factor is enough to keep the citations from getting written haha
1972 Honda CB750 AAMRR Racer
1972 Suzuki GT750 Project
1975 Honda CB400f
1981 Kawasaki KZ750 LTD
1984 Kawasaki GPZ550 =>610cc
1996 Honda CR500

Offline PeWe

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Re: Turbo Billet Block CB750
« Reply #61 on: June 15, 2019, 10:53:59 am »
Make sure you have good front brakes! I'm really happy that my front dual brakes work as good as they do. Despite stock calipers, DSS rotors and DSS cheap pads.
I had good use of the braking force when doing high speed WOTs to verify main jets. I was very close to bang an old h_ g from behind (after a obscured part of the road going upwards), driving car very slow and too much to the left while I had just twisted full from about closer to 160km/h (100 mph). The front tire screamed when braking full to avoid the slow going car as well as the meeting cars on a narrow road with no room left in the middle for a bike.  Speed limit was 70 km/h. Car went max 60...

1000cc react very quick on 5th gear especially with the RC295 profile it has.

Turbo on that... you need pilot license...! The horns grows quick after 4-5 car passes twisting throttle and give them a sonic bang when twisting passing them! I was sure I gave up that behaviour  35 years ago ;)
CB750 K6-76 1005cc JMR Billet block.
CB750 K2-75 Parts assembled to stock K2

 

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