Author Topic: Not a 4, but a SOHC, and a CB...  (Read 2518 times)

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Offline mlinder

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Not a 4, but a SOHC, and a CB...
« on: August 17, 2010, 09:43:27 AM »
So, I wanted to show the work that MRieck has done for me, Jon, and our racing bikes.

They aren't 4's, but they are racebikes, they are Hondas, and a lot of the stuff is built by one of our most respected members.

This is the first head we had done by Mike. First here is stuff for Jons 350. Some of this is a repost from "other bikes", but I want it here in the racing section.

Here is a view of the 1mm over kibblewhite stainless intake valves, and very nicely deshrouded chamber.



Next is the top of the head. Heavy duty racing springs, Ti Retainers, and some other things I can't tell you about. It's a secret. This head has been setup to accept the lumpiest cam available.




Third is stage 3 porting job, intake side.




And the porting on the exhaust side.



Here is the balanced crankshaft sent out to Mike. He had some help with it, but I can't for the life of me remember who it is. Some guy who makes drag racing GS's.




We've been working on adapting wiseco xr200 pistons to our builds, but to get Jons build expedited, I went ahead and ordered Boretechs 12.5:1 CR 362cc pistons.

Here you can see the Boretech piston on the left, and the (not finished) xr200 piston on the right. The Boretechs are within half a gram of each other out of the box. The xr200 pistons weigh a few grams less.



I'll be posting the stuff for my personal bike soon. Enjoy.

As always, Mikes stuff is top notch, and has so much care taken to be reliable, strong and well-performing. Love ya, Mike.


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Markcb750

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Re: Not a 4, but a SOHC, and a CB...
« Reply #1 on: August 17, 2010, 11:31:00 AM »
Is this the motor you are shaving grams from the piston to increase HP?


Looks like a nice damp camping trip BTW.

Offline mlinder

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Re: Not a 4, but a SOHC, and a CB...
« Reply #2 on: August 17, 2010, 11:35:00 AM »
Is this the motor you are shaving grams from the piston to increase HP?


Looks like a nice damp camping trip BTW.

Yep. I'm ok with a few more grams per piston for Jons build. He doesn't have the lightweight valvetrain that I've got going on in the other one, so s'ok.

Wasn't that damp, honestly.

How ya?
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Markcb750

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Re: Not a 4, but a SOHC, and a CB...
« Reply #3 on: August 17, 2010, 03:47:03 PM »
Doing well, have connected with some fellow SOHC nuts in the neighborhood, although some like that old limey stuff...

Learning a little about ignition systems, trying to form a fair opinion of Dyna based on a sample of one.

Offline mlinder

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Re: Not a 4, but a SOHC, and a CB...
« Reply #4 on: August 17, 2010, 04:02:34 PM »
Doing well, have connected with some fellow SOHC nuts in the neighborhood, although some like that old limey stuff...

Learning a little about ignition systems, trying to form a fair opinion of Dyna based on a sample of one.

They've worked fine for me. I can't imagine much of a difference between them and anything else at stock or near stock performance levels.
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Offline Bill/BentON Racing

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Re: Not a 4, but a SOHC, and a CB...
« Reply #5 on: August 17, 2010, 05:34:06 PM »
Beautiful! Sam,now we know who to blame. ;D..OK MR,back to the CB750A Asassinmatic! :D ;)Bill
BentON Racing Website
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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 Nikkisixx

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Re: Not a 4, but a SOHC, and a CB...
« Reply #6 on: August 17, 2010, 05:54:52 PM »
Doing well, have connected with some fellow SOHC nuts in the neighborhood, although some like that old limey stuff...

Learning a little about ignition systems, trying to form a fair opinion of Dyna based on a sample of one.

Hmmm, the Boyer lights the fire on my Tiger just fine...  ;D

Mlinder - nothing like freshly machined parts!
It is a proven fact that modifying a SOHC Honda in any way will bring on the apocalypse.

Offline kos

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Re: Not a 4, but a SOHC, and a CB...
« Reply #7 on: August 17, 2010, 09:24:36 PM »
I see pics of crank...whats been done?

Kos
220...221, whatever it takes.

Offline mlinder

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Re: Not a 4, but a SOHC, and a CB...
« Reply #8 on: August 17, 2010, 10:34:17 PM »
I see pics of crank...whats been done?

Kos

Balanced.
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Offline Sam Green Racing

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Re: Not a 4, but a SOHC, and a CB...
« Reply #9 on: August 17, 2010, 11:13:38 PM »
Balanced by Zint. Zint2@verizon.net

Sam. ;)
C95 sprint bike.
CB95 hybrid race bike
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JMR Racing CB750A street ET drag bike

Offline mlinder

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Re: Not a 4, but a SOHC, and a CB...
« Reply #10 on: August 18, 2010, 07:12:39 AM »
Balanced by Zint. Zint2@verizon.net

Sam. ;)

Hrmm, not sure it was Zint, Sam, or at least not fully. I believe a fair bit of work on full roller cranks is done elsewhere. Need to get Mike in here to remind us.
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Offline MRieck

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Re: Not a 4, but a SOHC, and a CB...
« Reply #11 on: August 18, 2010, 07:42:57 AM »
Zint did the rod work and Rick Stetson did the crank work.
Owner of the "Million Dollar CB"

Offline mlinder

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Re: Not a 4, but a SOHC, and a CB...
« Reply #12 on: August 18, 2010, 08:10:18 AM »
Zint did the rod work and Rick Stetson did the crank work.

There we go. I knew it was complicated. :)
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Offline mlinder

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Re: Not a 4, but a SOHC, and a CB...
« Reply #13 on: August 18, 2010, 08:14:17 AM »
Here's head #2 from Mike.

This head, while similar in porting, has a bit different valve and spring setup. The valves are 5mm instead of stock 7mm, and as you can see, the springs and retainers are also smaller diameter. This gives me a lighter valve train, which reduces weight, wear, and increases usable rpm (valve-float happens later). Also, this setup has valve caps. whereas the earlier one does not. Nice Ti valvecaps. This head, obviously, has new valves all around. the earlier one uses stock exhaust valves.

Combustion chambers and valves:


Intake:


Exhaust:


Top of the head, with the kibblewhite 5mm valve-stem conversion, HD Springs, etc:


Again, as always, truly amazing work by Mike Rieck.
« Last Edit: August 18, 2010, 08:16:06 AM by mlinder »
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Offline mlinder

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Re: Not a 4, but a SOHC, and a CB...
« Reply #14 on: September 07, 2010, 04:06:06 PM »
Started putting the engine together last night. Had to remove some material from the cam-chain tunnel to get the teflon chain tensioner to fit.

We went with a later model cam chamber and cam for it.

Interesting that the cams are different between the k1's and k2's and the later models. Bigger lobes, bigger cam, with a different location for the rocker pivots. Gets the same lift and duration by moving those pivots.

Made me wonder what would happen with the earlier cam in the later cam chamber... Both more lift and longer duration, but I wonder if it would let the valves close...
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