Topic: Building of a CB500 classic racer

[turboguzzi]

looking good rene

what is that exhaust pipe? look like a "flat" collector".....

[Howell]

looking good rene

what is that exhaust pipe? look like a "flat" collector".....

It's indeed a flat collector.

[Howell]

Surprise from our tuner , the engine is in da house  

[bwaller]

Sweet. Man I've got butterflies. 

[turboguzzi]

wow, looks like it will be running soon!

beautiful!

just a few comments from my experience:

* most people racing 500's here, me included, use an external line to feed oil directly to the head, really recommend this. less oil leaks!
* I have the feeling that your inlet tracts are very long, I got very good torque with long inlet but it hurted a bit the top end, will be interesting to see how it works for you.
* I think your rider will appreciate fork brace? it will help a lot your rigidity, 

are you planning a dyno run?

Cheers

TG

[Howell]

wow, looks like it will be running soon!

beautiful!

just a few comments from my experience:

* most people racing 500's here, me included, use an external line to feed oil directly to the head, really recommend this. less oil leaks!
* I have the feeling that your inlet tracts are very long, I got very good torque with long inlet but it hurted a bit the top end, will be interesting to see how it works for you.
* I think your rider will appreciate fork brace? it will help a lot your rigidity,  

are you planning a dyno run?


Cheers

TG

Hi TG,

Yes indeed the inlet tracts are long , but we go on the Dyno and will see the result , it 's easy to shorten them.
Our friend with the no.46 Honda has two raceseasons experience without an external oil line without any problem and also don't use a forkbrace.
So our engine is the same way build up.
Do you have a picture of that oil line how it is installed , I am curious about it.
It depends of the circuittest if we must use a fork brace.

[paulages]

wow, looks like it will be running soon!

beautiful!

just a few comments from my experience:

* most people racing 500's here, me included, use an external line to feed oil directly to the head, really recommend this. less oil leaks!
* I have the feeling that your inlet tracts are very long, I got very good torque with long inlet but it hurted a bit the top end, will be interesting to see how it works for you.
* I think your rider will appreciate fork brace? it will help a lot your rigidity,  

are you planning a dyno run?


Cheers

TG

Hi TG,

Yes indeed the inlet tracts are long , but we go on the Dyno and will see the result , it 's easy to shorten them.
Our friend with the no.46 Honda has two raceseasons experience without an external oil line without any problem and also don't use a forkbrace.
So our engine is the same way build up.
Do you have a picture of that oil line how it is installed , I am curious about it.
It depends of the circuittest if we must use a fork brace.

here's how i ran mine:



i tapped one of the main gallery plugs for the feed. the head has alu plugs where the oil passages were line bored.. these are easy to remove, and you only need to tap the resulting hole. i used a banjo fitting to get a clean angle away from the head.. don't know what others have used. blocking the stock passageways is easy as well. i used set screws with red loctite to hold them in. i also filled the inside (pressure side) of the stock oil jet with RTV sealant in case any oil makes it past the bottom set screw.

you need to remember to restrict the lines or you will lose pressure to the bottom end.

[Howell]

wow, looks like it will be running soon!

beautiful!

just a few comments from my experience:

* most people racing 500's here, me included, use an external line to feed oil directly to the head, really recommend this. less oil leaks!
* I have the feeling that your inlet tracts are very long, I got very good torque with long inlet but it hurted a bit the top end, will be interesting to see how it works for you.
* I think your rider will appreciate fork brace? it will help a lot your rigidity,  

are you planning a dyno run?


Cheers

TG

Hi TG,

Yes indeed the inlet tracts are long , but we go on the Dyno and will see the result , it 's easy to shorten them.
Our friend with the no.46 Honda has two raceseasons experience without an external oil line without any problem and also don't use a forkbrace.
So our engine is the same way build up.
Do you have a picture of that oil line how it is installed , I am curious about it.
It depends of the circuittest if we must use a fork brace.

here's how i ran mine:



i tapped one of the main gallery plugs for the feed. the head has alu plugs where the oil passages were line bored.. these are easy to remove, and you only need to tap the resulting hole. i used a banjo fitting to get a clean angle away from the head.. don't know what others have used. blocking the stock passageways is easy as well. i used set screws with red loctite to hold them in. i also filled the inside (pressure side) of the stock oil jet with RTV sealant in case any oil makes it past the bottom set screw.

you need to remember to restrict the lines or you will lose pressure to the bottom end.

Very nice done, but is it absolutely necessary .
 

[paulages]

Don't get any leaks? Not neccesary... most leaks on these come from here though. It's the only pressurized point in the barrels.

[lordmoonpie]

Do you get any top end oil starvation issues like the CB450 TG, if you don't do this? Very similar type modification on the CB450 for racing to ensure lots of oil gets up to the cam area or wear rates increase and race seizures are quite common.

[Howell]

Don't get any leaks? Not neccesary... most leaks on these come from here though. It's the only pressurized point in the barrels.

In two raceseasons no leaks by the bike of my friend (no.46) and we use the oilpump of a CB650 and the oilpan (500cc more oil) also a oilcooler and an external oilfilter.
So more oil and pressure and cooler , practice will learn.

[turboguzzi]

there are a few good reasons why to do it:

* No oil passing through the head gasket means you can use a copper gasket (better for heat transfer)

* no need to deal with those stupid o-rings

* oil going up to the head doesn't pick up more heat while passing trough the hot cylinder block - arrives cooler to the cam?

Sure, nothing is absolutely necessary, you can win races without it too....  

if your engine is closed now you will have to wait for a rebuild though, you have to plug the oil galleries in the crankcase form the inside

Cheers

TG

[paulages]

there are a few good reasons why to do it:

* No oil passing through the head gasket means you can use a copper gasket (better for heat transfer)

* no need to deal with those stupid o-rings

* oil going up to the head doesn't pick up more heat while passing trough the hot cylinder block - arrives cooler to the cam?

Sure, nothing is absolutely necessary, you can win races without it too....  

if your engine is closed now you will have to wait for a rebuild though, you have to plug the oil galleries in the crankcase form the inside

Cheers

TG

i plugged mine at the bottom of the passagway in the cylinder block...  ok, maybe not ideal because a leak could still spring at the base gaske, but it's worked for me.

[kos]

Surprise from our tuner , the engine is in da house  

Beautiful looking engine! Can I ask what manifolds did you use to connect CR Specials into head? Custom built or sourced from another bike and modified?

KOS

[Howell]

Surprise from our tuner , the engine is in da house  

Beautiful looking engine! Can I ask what manifolds did you use to connect CR Specials into head? Custom built or sourced from another bike and modified?

KOS

The alu manifolds are custom build and the rubber ones (29mm) are originally for the Honda minibikes , brand is Takegawa.
We had to make also new mount adaptors for the carbs because they are for the CB750 and as you can see they are longer then the original.

[Sam Green Racing]

You're up early Rene, can't sleep? 

Sam.

[Howell]

You're up early Rene, can't sleep?  

Sam.

Hi Sam,

I sleep very well , but I start to " work " early at 06:30 (dutch time) at the office (ING Bank) but there is nothing to do at the moment at our department.(financial crisis you know)
Instead of working I read several forums on worktime.
On the 1 march my job at the office is done and I will be home from that date , because of a reorganization,  no more working just hobbying.
I get a very big amount of redemption money from my employer (ING Bank) also many colleges , enough for living till my pension at 65.
From that time I will not be so early on the internet.
I have received the money already and it is stored in my shed , no more banking.

[bwaller]

Oh nice Rene, congratulations, let us know how the full time hobbying goes!

I don't need to tell you there will be more space in that shed once you start racing that 500. 

[SteveD CB500F]

Did they pay you in US$ then??

 

[Howell]

Oh nice Rene, congratulations, let us know how the full time hobbying goes!

I don't need to tell you there will be more space in that shed once you start racing that 500. 

From the 1 march I have already a new boss , my wife.
She has already many projects for me , such as doing the household ,cooking , shopping , repainting the house inside etc.
The interest of that amount must be enough for racing 

[Sam Green Racing]

You're up early Rene, can't sleep?  

Sam.

Hi Sam,

I sleep very well , but I start to " work " early at 06:30 (dutch time) at the office (ING Bank) but there is nothing to do at the moment at our department.(financial crisis you know)
Instead of working I read several forums on worktime.
On the 1 march my job at the office is done and I will be home from that date , because of a reorganization,  no more working just hobbying.
I get a very big amount of redemption money from my employer (ING Bank) also many colleges , enough for living till my pension at 65.
From that time I will not be so early on the internet.
I have received the money already and it is stored in my shed , no more banking.

All those notes are the old Zimbabwean $   worth about £3. 

Sam.

[Howell]

You're up early Rene, can't sleep?  

Sam.

Hi Sam,

I sleep very well , but I start to " work " early at 06:30 (dutch time) at the office (ING Bank) but there is nothing to do at the moment at our department.(financial crisis you know)
Instead of working I read several forums on worktime.
On the 1 march my job at the office is done and I will be home from that date , because of a reorganization,  no more working just hobbying.
I get a very big amount of redemption money from my employer (ING Bank) also many colleges , enough for living till my pension at 65.
From that time I will not be so early on the internet.
I have received the money already and it is stored in my shed , no more banking.

All those notes are the old Zimbabwean $   worth about £3. 

Sam.

#$%*, I will have a good look at it.
They told me that it are euro's , so my own employer ING bank cheated me.
Now I know why we have a financial crisis and I have also now a financial crisis.

[westondc]

oh now this is a cool build that I will be keeping tabs on!

[Howell]

Yesterday I received the power supply from Hongkong bought on Ebay for the electronic ignition.
Includes  two Lipo batterys and a charger.
Much less weight than a normal battery.(346g)
The power of one Lipo battery is 14,8 V and 4 Amp enough for our ignition and coils.
We gonna use two of them while one is in use the other can be charged.

[SteveD CB500F]

OK. The pink and blue ones could be € but the big pile of greenbacks is surely $$$