What Carbs? - Honda Motorcycles - FireBlades.org
Honda FireBlade Discussion of the Honda CBR 900RR, Honda CBR 929RR, Honda CBR 954RR, and Honda CBR 1000RR Motorcycles.

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post #1 of 18 Old 10-16-2008, 4:17 AM Thread Starter
 
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What Carbs?

Hi,
Does anybody know what model or year these are from?

Thanx
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post #2 of 18 Old 10-16-2008, 4:33 AM
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Re: What Carbs?

'98/'99 ZX6R is my guess.

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder
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post #3 of 18 Old 10-16-2008, 4:48 AM Thread Starter
 
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Re: What Carbs?

Thanks a lot
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post #4 of 18 Old 10-18-2008, 6:34 PM
 
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Re: What Carbs?

are they Blade ones? if so must be an early one imo
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post #5 of 18 Old 10-19-2008, 1:50 AM
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Re: What Carbs?

Nope - Blades have different lids on them.
I initially placed them as GSXR ones but the stacks weren't right.
Then I realised I have a '98 ZX6R :-)

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post #6 of 18 Old 10-19-2008, 1:53 AM
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Re: What Carbs?

Now to determine what the engine is and why they decided to use downdraft carbs on what appear to be horizontal intakes:-)

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post #7 of 18 Old 10-19-2008, 8:21 AM
 
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Re: What Carbs?

well I thought it unlikely to be blade ones. never seen gixer ones. they didn't look like any Yam ones I've seen either.
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post #8 of 18 Old 10-20-2008, 7:24 AM Thread Starter
 
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Re: What Carbs?

They are 98 zxr jets drilled to 1.65 mm methinks.
The engine is a 2l Ford Sierra Pinto (done up a bit)
And just bolted on using tig welded manifold. The
only thing connected is the accelerator cable and fuel line.
Thanks to all
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post #9 of 18 Old 10-20-2008, 7:46 AM
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Re: What Carbs?

If you know what the jet sizes are how come you had to ask what the carbs were?
I'm looking to fit bike carbs to my car.
1300cc and 6000rpm so I'm looking at 600cc carbs as well - half the capacity at twice the revs so breathing should be similar.
For a car I'm leaning towards the smaller carbs to retain midrange but I'm also an experimenter so I might try some bigger ones as well.
I don't want to run downdrafts though as I have horizontal intake tracts anyway. Seems wasteful to build a chicane into the intake tract and it's much easier to fit the bike intake manifolds to the engine and simply pop the carbs into them just as if they were going onto the bike engine.
The ports of the engine are 250mm across the outside centres (929 throttle bodies are 240mm for comparison) so it should be as simple as cutting a piece of 10mm aluminium plate to fit the bolt pattern of the head, cut the ports through it and screw the bike intake manifolds into the plate.
That's my plan anyway :-)

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post #10 of 18 Old 10-20-2008, 9:57 AM Thread Starter
 
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Re: What Carbs?

"If you know what the jet sizes are how come you had to ask what the carbs were?"
I was sold them by a chap who was the business partner of someone who worked on the mechanical side of his business he said they were fireblade carbs (dont think he knew much more than me) he also quoted the jet size which look about right on the vernier scale.
All in all though I am impressed with the performance.
Plan sounds good Larry
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post #11 of 18 Old 10-20-2008, 11:02 AM
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Re: What Carbs?

I knew there had to be a simple explanation :-)
How have you fitted them to the head?
Was it running the stock intake manifold and carby before?
For measuring jets a large needle works well.
Coat it liberally with texta then gently rotate it in the jet to mark a contact ring which you can then measure with a mic with very good accuracy.

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post #12 of 18 Old 10-22-2008, 7:23 AM Thread Starter
 
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Re: What Carbs?

The manifold was custom built and carbs are attached with short sections of silicone hose and 2 jubilee clips on each runner.
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post #13 of 18 Old 10-22-2008, 7:48 AM
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Re: What Carbs?

Did you choose to run downdrafts for a specific reason rather than mount them lower down?

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post #14 of 18 Old 10-23-2008, 8:54 AM Thread Starter
 
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Re: What Carbs?

You`ll have to excuse me as a newbie but what are downdrafts?
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post #15 of 18 Old 10-23-2008, 9:01 AM
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Re: What Carbs?

The carbs you're running sit above the intake ports and flow air downwards rather than horizontally.
They're designed for a head that has straight intake tracts and thus require the carbs to be canted over to flow into them. This dictates having the float bowls at an angle so you can't run them on a horizontal-tract head unless you fabricate angled intake manifolds as you have.
With horizontal carbs your airflow would go into the port and only curve once as it enters the chamber.
Running the downdrafts means the airflow has to curve twice in opposite directions as it enters the port and again as it enters the chamber.

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