Supercharged CBR250 build

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gennyshovel
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Re: Supercharged CBR250 build

Post by gennyshovel » Thu Jan 23, 2014 10:17 am

Damn Gum trees, turn your back for 5 seconds, and "pop" this dropped into the fuel line, then trickled down to the filter, and took up residence there.
It wouldn't have caused the lean off, but it sure wouldn't have helped, once again Bones, your bloods worth bottlin'

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Tiny DLRA# 484
Postiebike Racing , created & funded by TwoBob Engineering

grumm441
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Re: Supercharged CBR250 build

Post by grumm441 » Thu Jan 23, 2014 12:54 pm

Special Australian Jetting
G
They make it
I make it work

hawkwind
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Re: Supercharged CBR250 build

Post by hawkwind » Thu Jan 23, 2014 3:27 pm

A true shade tree mechanic in every sense :lol:
Vehicle......................A new creation.
Designed by................Troglodyte.
Engineered/ built by......Rustic.
Financed by.................Nickles & Dimes.
Rider......................... Tardus Vetus Inflatio

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gennyshovel
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Re: Supercharged CBR250 build

Post by gennyshovel » Thu Jan 23, 2014 3:55 pm

hawkwind wrote:A true shade tree mechanic in every sense :lol:
You would think the shed would be a cone free environment, but, no, this crap sneaks thru the roof capping .
The fuel line was disconnected for 2 minutes while I drained the tank.
Edit...
It seems I also have a foreign object somewhere in the pilot system too, lean as hell @ idle, pulled the air screw and did a rough blow thru, restarted, A/f of 5/1, "touched" the air screw,,,straight up to 9/1, lean enough to freak the gauge out and show an error :x
Another surgical clean happening now, trying to catch any grit on a clean piece of paper towel so I know the culprit
Bloody carbies,,,,,
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Postiebike Racing , created & funded by TwoBob Engineering

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BONES
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Re: Supercharged CBR250 build

Post by BONES » Thu Jan 23, 2014 5:37 pm

Tiny
What size pilot?
The Yamaha uses a #70 and has never had a problem.
What fuel are you using?
R30 is no good with methanol, use shell M.
Grum
24, 25, 26+ Do you want me to come down and sweet talk her?

Bones

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gennyshovel
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Re: Supercharged CBR250 build

Post by gennyshovel » Thu Jan 23, 2014 5:42 pm

BONES wrote:Tiny
What size pilot?
The Yamaha uses a #70 and has never had a problem.
What fuel are you using?
R30 is no good with methanol, use shell M.
Grum
24, 25, 26+ Do you want me to come down and sweet talk her?

Bones
Recently up from 65, to 70 mate
Methanol, I'll use bugger all till I sort it.
Tiny DLRA# 484
Postiebike Racing , created & funded by TwoBob Engineering

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AuotonomousRX
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Re: Supercharged CBR250 build

Post by AuotonomousRX » Fri Jan 24, 2014 9:31 am

gennyshovel wrote:.
I've got (hopefully) more than enough fuel supply, 3.5 psi 70 gallon/hr pump, Holley bowl+ Mikuni bowl without floats
Next run will be just a clean version of todays, although Iv'e drilled a needle jet, and have 660, 680 & 710 mains in the "maybe" box, depending what happens?
Maybe, just maybe the needle jet is maxed out now, I'm still under the size I figured I'll need, 1 step at a time,,,,,
Hey Tiny

Again I am am not sure if any conclusions can be drawn between your Blown 250 and my Smoker, but this is the Jetting I am running.

My current set up runs two 34mm Mikunis with a #370 (4/042 type) main Jets and #50 (N102221 type approx 35cc/min) Power Jets per Carb.

So I have about 405cc/Min x 2 worth of Jetting between 3/4 and WOT (makes 67 Dynojet RWHP) running Petrol (Sunoco Supreme).

A standard tune RGV runs about 315cc/min x 2 worth of Jetting between 3/4 and WOT (approx 57-60 Dynojet RWHP).

The sort of flow from the Jet sizes you're running for Methanol are pretty close to the stock RGV uses on Petrol mmmm......

Pete :D
Metric Target 250 on a 250 on a Red Bike

Pete :shock:
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gennyshovel
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Re: Supercharged CBR250 build

Post by gennyshovel » Fri Jan 24, 2014 9:51 am

:oops: :oops: :oops: :oops: :oops: :oops:
Errrr,,Ummmmm,,I seem to have installed the automatic float level model Holley float bowl, nudge nudge :wink: :wink:
It had it's royal fatness & surge return after it had its bowl filled up :oops: :oops: :oops:
I'll leave the float level sight glass on while I sort the jetting I think (I wish I'd used a Holley bowl with the window in it)
Seeing as there's still HEAPS of time left 'till speedweek, the Bosch LSU4.2 0s sensor sensed it was time to turn up it's toes, so I have time to tidy up the shed while I wait for a replacement, THEN I can continue to test.
Maybe I'll have room for more beer at the lake if there's no bike in the ute :shock:
Tiny DLRA# 484
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BONES
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Re: Supercharged CBR250 build

Post by BONES » Sat Jan 25, 2014 8:10 am

Tiny
Don't use R30 it will not mix properly with methanol.
Shell M is good.
Go see a speedway solo rider- they use oil which is methanol compatable

Bones

Stayt`ie
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Re: Supercharged CBR250 build

Post by Stayt`ie » Sat Jan 25, 2014 8:30 am

Titan (Fuchs) Formular 60,,
First Australian to ride a motorcycle over 200mph at Bonneville,,,

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AuotonomousRX
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Re: Supercharged CBR250 build

Post by AuotonomousRX » Sat Jan 25, 2014 9:41 am

When you run Methanol do you need a Methanol Compatible engine Oil and an Oil mixed with the Fuel as a cylinder Lubricant.

I was in the Pit Crew of a Turbo Rotary Drag Car and they added Castrol M to the Fuel and used Brad Penn Engine Oil.

Pete :?:
Metric Target 250 on a 250 on a Red Bike

Pete :shock:
DLRA #866
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BONES
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Re: Supercharged CBR250 build

Post by BONES » Sun Jan 26, 2014 9:12 am

It's good to run some sort of lubricant in the oil but it is not necessary. Methanol has NO lubricating properties.
There are some adatives designed for this. Shell M is good. For oil in 4strokes and to mix for 2strokes.
You do need an oil which is methanol compatable- any blow by needs to mix with the oil so it does not turn to glug.
Bones

grumm441
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Re: Supercharged CBR250 build

Post by grumm441 » Wed Jan 29, 2014 8:30 am

BONES wrote:Tiny

Grum
24, 25, 26+ Do you want me to come down and sweet talk her?

Bones
I broke her Subaru last week . Well, it broke while I was driving it, and it's not worth fixing
If it wasn't for my Dad having a family loan car I would be in real strife
So you could try , however.....
G
They make it
I make it work

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gennyshovel
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Re: Supercharged CBR250 build

Post by gennyshovel » Fri Jan 31, 2014 5:23 pm

Had another test ride early this morning,,sooooo close now, a tad lean on the main, but that may be due to the "test tank" and it's lack of adequate venting.
2 more issues appeared,
Overheating
Clutch slip

The new thermostat may be a bit slow to open, so I'll replace that with a restrictor plate before I go out again
I have 2 clutches, one has done 42,000 k's, the other, LOTS, guess which one I put in ? (both look the same at a glance), but I measured the "spare" spring free length, and friction plate thickness, as good as new, I'll compare the other when I take it out, but I need to get the jetting spot on 1st, then the cooling,

Guess who stuffed up when he turned the GoPro "data logger" on ?
Yep, no egt, O2 or other reviews this time,,,just my memory,,and there are only 3 brain cells left,,,,,,
Did I mention how HOT is is ?
Tiny DLRA# 484
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grumm441
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Re: Supercharged CBR250 build

Post by grumm441 » Fri Jan 31, 2014 7:09 pm

I was looking at a restored supercharged Vincent drag bike last week
He had replaced the oil tank with a round top fame tube that he was using as a fuel tank
It had a radiator cap on it and was running a bleed from the blower to pressurize the tank
Got rid of the need for a fuel pump and removed the chance of cavitation in the pickup
G
They make it
I make it work

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