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Author Topic: "La Pastinaca" CB450 498cc Big Bore Engine Built By DWMS Racing!  (Read 50781 times)

Offline joeyputt

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I have been provided the great honor and priviledge of working with Brother Habanero52 to build the engine for his CB450 "La Pastinaca"!
 
We will be completely disassembling this engine and building it from the bare cases with a lot of photos so for all of you who share the love affair with the CB450, or high performance engines in general, you will not want to miss this thread!
 
Here are a couple photos of the engine as I received it from Brother Habanero52.
 


« Last Edit: Jan 11, 2014, 21:35:45 by joeyputt »
Joe - Owner/Operator of DWMS Racing World Class Engine & Motorcycle Building www.dwmsracing.com

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Offline Swagger

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Re: "La Pastinaca" CB450
« Reply #1 on: Jul 14, 2011, 22:03:01 »
I'm working on one myself, will be interesting to compare the two!
Can't wait to see what madness you come up with Joey!
.....there's no way that little rice cooker is going 100m/h when the work need to get up to those speeds includes a big fuck off fairing shaped like a giant cock. ~Staffy

Weiner tetanus is nothing to scoff at. ~JustinLonghorn

Offline joeyputt

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Re: "La Pastinaca" CB450
« Reply #2 on: Jul 14, 2011, 22:22:13 »
Brother Swagger I can not wait to see yours! This is the kind of build that I always look forward to doing as Brother Habanero52 is really great to work with and is providing a wonderful list of parts!

I started disassembling the engine for cleaning and inspection while some of the parts were on the way.

I removed the cylinder head, cylinders, side covers, etc.

 
I disassembled the cylinder head and started cleaning it in preparation for all of the machine work. Notice the CB450 has an aluminum head with steel semi hemispherical combustion chambers.

 

 
 
 
 
« Last Edit: Jul 14, 2011, 23:05:10 by joeyputt »
Joe - Owner/Operator of DWMS Racing World Class Engine & Motorcycle Building www.dwmsracing.com

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Offline Swagger

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Re: "La Pastinaca" CB450
« Reply #3 on: Jul 14, 2011, 23:37:24 »
If it looks like any of your others it'll be stunning!
.....there's no way that little rice cooker is going 100m/h when the work need to get up to those speeds includes a big fuck off fairing shaped like a giant cock. ~Staffy

Weiner tetanus is nothing to scoff at. ~JustinLonghorn

Offline joeyputt

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Re: "La Pastinaca" CB450
« Reply #4 on: Jul 15, 2011, 00:12:31 »
Thank you for the compliment Brother Swagger it means more to me than you realize, your work is very nice as well!

I split the cases yesterday.


Today some of the parts came in including a close ratio 5th gear!


Before I fully disassembled the bottom end I wanted to test fit the close ratio fifth gear so I removed the main and counter transmission shafts and gears.


This photo shows the mainshaft with the stock 5th gear.


The mainshaft with the stock 32 tooth 5th gear removed.


Here is the mainshaft with the 31 tooth close ratio 5th gear installed, and the stock gear in the bottom of the photo.


I installed the mainshaft, countershaft, and gears back into the case to check the fitment of the close ratio 5th gear, it went togethor beautifully so now I can completely disassemble the cases for cleaning.


Joe - Owner/Operator of DWMS Racing World Class Engine & Motorcycle Building www.dwmsracing.com

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Offline teazer

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Re: "La Pastinaca" CB450
« Reply #5 on: Jul 15, 2011, 03:41:29 »
Joey,

Is that a new 31T and does it come with a matching gear for the other shaft or does it just have more backlash?  That gear looks brand new - is it?

NOVA in the UK list top gear as 25-23 and first as 16-30 so something must have changed over the years. 

Offline Habanero52

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Re: "La Pastinaca" CB450
« Reply #6 on: Jul 15, 2011, 10:16:09 »
The honor is all mine! I am delighted with the way you are handling the project and the communication between us.
I know that this will be an enviable engine once you have completed it.
Thank you for everything.
 :D ;D

Habanero52
Speed cost....How fast do you want to spend?
Follow the dream.
Why does life get in the way?

Offline Habanero52

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Re: "La Pastinaca" CB450
« Reply #7 on: Jul 15, 2011, 13:46:11 »
Teazer, that is a spanking brand new gear! It did not come with a matching gear, for it is not available any more.
Habanero52
Speed cost....How fast do you want to spend?
Follow the dream.
Why does life get in the way?

Offline VonYinzer

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Re: "La Pastinaca" CB450
« Reply #8 on: Jul 15, 2011, 16:27:22 »
Right on Joe! This will be a jewel for sure.
The faces of the damned
And all the butchered lambs
If I had to do it over
I just would've done it slower

Offline joeyputt

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Re: "La Pastinaca" CB450
« Reply #9 on: Jul 15, 2011, 16:29:57 »
Brother Teazer as Brother Habanero52 already mentioned it is a new gear, the stock gear in this engine was a 32 tooth and the new gear is a 31 tooth. Both gears can be seen from the side in the photos above as well for a tooth count.

The backlash specs that I have for the CB450 show the servicable limits as 0.0037-0.0074 in. or 0.094-0.188mm for 3rd, 4th, and 5th gears. The new gear falls within this range, I will put gauges on it and get the exact number if you are interested.

The gear appears to have been designed and cut with the correct amount of backlash to be run as a drop in replacement for use with the stock countershaft gear, it definately has a very nice fit!
Joe - Owner/Operator of DWMS Racing World Class Engine & Motorcycle Building www.dwmsracing.com

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Offline joeyputt

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Re: "La Pastinaca" CB450
« Reply #10 on: Jul 15, 2011, 16:33:25 »
Right on Joe! This will be a jewel for sure.

Brother it is definately going to be pretty but a lot of the jewels will be on the inside! Yesterday I received two big boxes of parts that Brother Habanero52 sent and was like a child at christmas going through them all! Hahahaha! You would think after all of these years I would be tired of looking at shiny new parts but for me it never gets old!
« Last Edit: Jul 15, 2011, 16:41:24 by joeyputt »
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Offline teazer

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Re: "La Pastinaca" CB450
« Reply #11 on: Jul 15, 2011, 16:44:31 »
New gears are always a nice thing and if the lash is in spec and tooth engagement is deep enough you should be good to go. We do something similar on GT570 using GS gears and it's an old trick on Honda 305s to use a Dream top gear with one less tooth.

Is that a closer top gear or higher first gear? According to NOVA it's bottom gear that uses 30T ( different again). 

Do you have all the tooth pairs and I can compare them to what NOVA has. It is possible that different years used different gear ratios or maybe General Export Vs UK or something.


Offline joeyputt

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Re: "La Pastinaca" CB450
« Reply #12 on: Jul 15, 2011, 17:01:51 »
Brother it is a K5 engine and 5th gear on the main shaft. I am removing the crankshaft and transmission now, I have a computer next to my work table, for final inspection and cleaning and can post all of the gear counts for you.
Joe - Owner/Operator of DWMS Racing World Class Engine & Motorcycle Building www.dwmsracing.com

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Offline teazer

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Re: "La Pastinaca" CB450
« Reply #13 on: Jul 15, 2011, 17:25:10 »
Joe,
That's really interesting.  I went on line and trolled through parts list and found most of the gears and 32T is listed as top gear mainshaft as you said. All the gear pairs I could match were around 58/59 teeth but NOVA lists them as 45/46/48 which is very different.  CB350 and 360 and race kit trans are in the 55-58 tooth range. I wonder what NOVA used as their starting point? In fact the gears that NOVA list re very close ratio.  I wonder if that was a race kit trans they were measuring.  I have no data on those.   

If you get a chance to count teeth sometime, I'd appreciate it. From the parts list it looks like 41- (18), 22-(37), 26-33, 29-29,32-27.  The numbers in brackets were guesses based on tooth counts in the other pairs. They are probably fixed.

 

Offline joeyputt

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Re: "La Pastinaca" CB450
« Reply #14 on: Jul 15, 2011, 18:10:34 »
Sure that is no problem at all Brother, I just got the crankshaft and transmission out and am working on cleaning the cases and I am going to record the transmission numbers for Brother Habanero52's build sheet so I can post them here for you as well this afternoon.
Joe - Owner/Operator of DWMS Racing World Class Engine & Motorcycle Building www.dwmsracing.com

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