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Author Topic: CB550 Track Bike Goes Racing  (Read 32595 times)

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Offline bwaller

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Re: CB550 Track Bike Goes Racing
« Reply #100 on: May 09, 2019, 05:17:45 AM »
Good luck this season. Hoping there's a smile on your face, post dyno work!
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Offline turboguzzi

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Re: CB550 Track Bike Goes Racing
« Reply #101 on: May 09, 2019, 01:51:49 PM »
some nice new goodies in the there. will be interesting to see if you feel a difference before/aft. in terms of crank weight. how many has been taken off?
carillo rods are good for piece of mind, even if the 500/550 doesnt seem to suffer in that area as the 750. hope the sump mods solve your oil issues.
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Offline Rocketman

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Re: CB550 Track Bike Goes Racing
« Reply #102 on: May 09, 2019, 02:30:39 PM »
With the Carrillo rods I should see a little less stretch and can tighten up the squish from .040 to .035.  The stock crank weighed 19.5 lbs. on my bathroom scale and 16.5 after lightening.  Not super accurate, but a 3 lbs. difference.

Worked on installing the Cycle X straight intake manifolds today and re-racking the carburetors.

Here are the new manifolds with two rubbers boots installed.  Forty millimeter Honda clamps are just right.  95018-40250  This part number works for multiple carb clamps, just change to 40 to the size desired.



Re-racked carbs mounted.



You need to purchase the bracket on the side of carb #2 that holds the fuel "T" in place.  Without it the fuel "T" can slip out and allow fuel to spill.  Sudco carries them.



Looking down the carb mouth you can just see the valve guide at the back!  A nice straight shot for the air/fuel mixture.

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Offline MRieck

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Re: CB550 Track Bike Goes Racing
« Reply #103 on: May 10, 2019, 05:04:18 AM »
 Tightening the squish will make a really nice difference....that's where the power is.
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Offline turboguzzi

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Re: CB550 Track Bike Goes Racing
« Reply #104 on: May 10, 2019, 07:49:27 AM »
now that i see the manifolds installed, got to tell you that i am not excited about the way they block out the exit of hot air at the back of the head,

all that effort with exotic coatings to reduce thermal load and then this? :)

would cut off the plate around the inlet bore and two screws and leave each manifold alone.

thats the way i built mine, never had a problem with rigidity or sealing, weights a ton less and keeps air passage free

will post a pic later, not at home now
 
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Offline turboguzzi

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Re: CB550 Track Bike Goes Racing
« Reply #105 on: May 10, 2019, 11:19:05 AM »
found my original thread
think this pic explain well the free air passage behind the head
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Offline simon#42

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Re: CB550 Track Bike Goes Racing
« Reply #106 on: May 10, 2019, 11:28:20 AM »
yes i must agree with tg , you have created an air dam . by the end of the back straight that head will be very very hot .
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Offline bwaller

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Re: CB550 Track Bike Goes Racing
« Reply #107 on: May 10, 2019, 12:21:44 PM »
Relieve the back side, trim all you can off it and drill a bunch of big holes.
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Offline Rocketman

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Re: CB550 Track Bike Goes Racing
« Reply #108 on: May 10, 2019, 12:56:30 PM »
I had not considered the effect on air flowing through the head!  Will need to take a good look and determine the best way to open it up.  Good call TG!  Thanks.
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Offline MRieck

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Re: CB550 Track Bike Goes Racing
« Reply #109 on: May 11, 2019, 10:39:57 AM »
 Sure is a good point....wish i had thought of that while I modifying them. TG.....I noticed the length of your manifold/insulators set up. Have you tried shortening them?
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Offline turboguzzi

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Re: CB550 Track Bike Goes Racing
« Reply #110 on: May 11, 2019, 02:20:03 PM »
Quote from: MRieck on May 11, 2019, 10:39:57 AM
Sure is a good point....wish i had thought of that while I modifying them. TG.....I noticed the length of your manifold/insulators set up. Have you tried shortening them?
that pic is from the first build with the VM26s 12 yrs ago... in the later iteration with CR29 they sit closer to the head.
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Offline MRieck

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Re: CB550 Track Bike Goes Racing
« Reply #111 on: May 12, 2019, 09:19:46 AM »
I understand. Brent's engine has benefitted from shortened manifolds.
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Offline bwaller

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Re: CB550 Track Bike Goes Racing
« Reply #112 on: May 12, 2019, 10:09:19 AM »
It's a bit tough to understand. From my 1973 school notes and formulas my intakes should have been really long. It always seemed the British race bikes used longer intakes.

I'm not sure what i would have done if left to my own devices, but this guy I know, Mike Rieck, convinced me to make them short for improved signal. So the cable stays touch the valve cover, about as short as they can be.

I think he was right!  ::)  ;D 
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Offline MRieck

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Re: CB550 Track Bike Goes Racing
« Reply #113 on: May 12, 2019, 05:10:41 PM »
Quote from: bwaller on May 12, 2019, 10:09:19 AM
It's a bit tough to understand. From my 1973 school notes and formulas my intakes should have been really long. It always seemed the British race bikes used longer intakes.

I'm not sure what i would have done if left to my own devices, but this guy I know, Mike Rieck, convinced me to make them short for improved signal. So the cable stays touch the valve cover, about as short as they can be.

I think he was right!  ::)  ;D
Yes...I have also seen long intake tracts for old British (Truimphs in particular) bikes. Different animals with large valves, longer duration working at much lower RPM's
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Offline Rocketman

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Re: CB550 Track Bike Goes Racing
« Reply #114 on: May 15, 2019, 05:58:51 PM »
The new and improved intake manifolds! 

Before & after.



Now that's what I'm talking about.  Lots of airflow now!



It is good to have friends with machine tools.



Big thanks to TG for spotting the issue. 
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Offline Tintop

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Re: CB550 Track Bike Goes Racing
« Reply #115 on: May 15, 2019, 06:05:54 PM »
Wow!  Amazing how much area was uncovered.  Have you also port matched them to the carbs & head?
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1976 CB400 SS - stock / BOTM 04/11 (SOLD)
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77 CB550 Cafe build
550/750 Filter Thread
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Offline Rocketman

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Re: CB550 Track Bike Goes Racing
« Reply #116 on: May 15, 2019, 06:11:49 PM »
They have been port matched.  Some of Mike Rieck's handiwork while he was refurbishing the head.
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Offline 754

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Re: CB550 Track Bike Goes Racing
« Reply #117 on: May 15, 2019, 07:03:12 PM »
They look really good.,well machined..
 Bet they match up easier as singles than 2 paired up..
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Offline MRieck

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Re: CB550 Track Bike Goes Racing
« Reply #118 on: May 16, 2019, 05:14:58 AM »
Nice work. ;)
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Offline turboguzzi

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Re: CB550 Track Bike Goes Racing
« Reply #119 on: May 16, 2019, 01:48:00 PM »
thats more like....

You welcome!
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Offline cb550fcafe

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Re: CB550 Track Bike Goes Racing
« Reply #120 on: February 13, 2020, 03:16:58 AM »
any advice on trying to get the Benelli cam chain tensioner ordered? I've tried and failed 3 times to get it ordered. I finally got an invoice in my email but thats it. I dont know how to complete the transaction. any tips are appreciated.
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Offline bwaller

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Re: CB550 Track Bike Goes Racing
« Reply #121 on: February 13, 2020, 09:14:12 AM »
Kevin try to get someone to help at the other end. I had someone on here help originally but he's no longer around.

 PM sent.
« Last Edit: February 13, 2020, 09:16:25 AM by bwaller »
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Offline Rocketman

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Re: CB550 Track Bike Goes Racing
« Reply #122 on: February 13, 2020, 02:15:54 PM »
You are on the right track if you have an invoice.  The next step is to send a payment by PayPal.  My invoice was in Euros, so be sure you are paying in the correct currency.  The last one I purchased was in 2017 and was 73.39 Euros.  As I recall the payment goes to their email address.  Here is the info from my payment:

Sent to

Benelli-Bauer GmbH&COKG
http://www.benelli-bauer.de
benelli-bauer-shop@t-online.de
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Offline turboguzzi

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Re: CB550 Track Bike Goes Racing
« Reply #123 on: February 13, 2020, 03:55:49 PM »
from the little german i know, they say in the front page that they are away for business travel and will take time to answer emails.

sounds like they are heading south to milan for the major swapmeeet/market this weekend...

FYI
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Offline MRieck

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Re: CB550 Track Bike Goes Racing
« Reply #124 on: February 13, 2020, 07:20:13 PM »
 I'd say buy a couple of them while you can. ;)
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