ESE's works engine tuner

[TZ350]

I have an article on the design of belmouths using CFD can try and post it if needed

I do love those Yamaha SDR frames ( cheap as here) , I think ( not sure that they are a bit flexy ,might be ok with the power of a bucket )

Just suspension then ,,,is there any internals that can be modded ?

Stephen

Hi Stephen I would be interested in the bell mouth design article. The SDR's frame looks the business, did they handle Ok with the 200 motor? This one is from Japan I think and looks like it has been raced, lots of lock wire, or is that a Japanese boy racer bling thing?. The suspension is long and soft. Can you tell us any more about the SDR's in Japan.

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[SS90]

Thanks, that would be great.

I was testing some different head designs yesterday (and today), and accidently fitted a head that (I would have thought) was totally unsuitable, as the uncorrected compression ratio measured at 10.6:1 (and 2.3mm head clearance)

Rather than taking it off, just for interest, I ran it up on the dyno, and the power is neigh on identical to a cylinder head with 13.4:1 (after playing with the ignition)

I'm not sure what this means just yet.

[Brian d marge]

yes they are raced http://page5.auctions.yahoo.co.jp/jp/auction/e96755106

I havent tested those frame but I have heard they flex , but thats with a 20 30 hp motor and spindly soft forks

I did see one of those frames on line quite cheap awhile back

I would love to draw one of those frames and load it up on the computer and see what it does !


Stephen

[TZ350]

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Thanks for the pic.

Could this be what Chambers next Bucket will look like?

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[F5 Dave]

. . .I do love those Yamaha SDR frames ( cheap as here) , I think ( not sure that they are a bit flexy ,might be ok with the power of a bucket )
. . .

Yeah they look cool & are sort of bucket sized & open enough to take a range of engines. I was eying one up as a mate had one bare with sw. Quick loft, urgh use 2nd hand. Golly! Heavier than they look.

[SS90]

Yeah they look cool & are sort of bucket sized & open enough to take a range of engines. I was eying one up as a mate had one bare with sw. Quick loft, urgh use 2nd hand. Golly! Heavier than they look.

About 13 years ago, I guy I worked with thought the same thing. He used to race 125's as well, and threw a set of old slicks on it, and went out on a few laps, the damned thing tied it'self in knots the first corner, man they are flexy frames!

Put some road tyres back on, and all was well.

[jasonu]

Yeah they look cool & are sort of bucket sized & open enough to take a range of engines. I was eying one up as a mate had one bare with sw. Quick loft, urgh use 2nd hand. Golly! Heavier than they look.

In other words Dave, they are shit piles

[TZ350]

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Ok the GP-Plenum Chamber is ready for a test ride.

Pic-01 it's ready
Pic-02 look who else has come to see how it goes...Friends of Thomas's...they bet against me in the sweep stake........bastards.
Pic-03 a quick push and it started right up.........starts real easy.
Pic-04 a short punt up the drive, drives well but falls flat over half throttle, hope its just jetting.
Pic-05 it even idles.........hows that.

If I can sort out the flat spot, its of to the dyno next week.

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[F5 Dave]

May I suggest at the very minimum some sort of generous front mudguard?

A heavy layer of grease on the castings will hopefully attract any grit/stones that make their way in, or at least tell you how much it is attracting..

[F5 Dave]

In other words Dave, they are shit piles

Yeah. . . but kinda cool looking shit piles in a minimalist lattice frame retro sort of way.

[Ned Kelly]

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Ok the GP-Plenum Chamber is ready for a test ride.

Pic-01 it's ready
Pic-02 look who else has come to see how it goes......they bet against me in the sweep stake........bastards.
Pic-03 a quick push and it started right up.........starts real easy.
Pic-04 a short punt up the drive, drives well but falls flat over half throttle, hope its just jetting.
Pic-05 it even idles.........hows that.

If I can sort out the flat spot, its of to the dyno next week.

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Nice work Rob. I must admit I was a bit sceptical. Did you have the helmet on when you fired it up.?

Will see what the dyno says, hope its the start of good Hp.

[TZ350]

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Nice work Rob. I must admit I was a bit sceptical. Did you have the helmet on when you fired it up.?

Yep.....didn't wan't Thomas's friends to see my red face if it blew up.............

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[woodyracer]

i should of worn my helemt when i binned my bike on the drive-way in the wet.........

[bucketracer]

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a quick push and it started right up.........starts real easy......it even idles.........hows that. ........

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Starts easy and idles, two things that I didn't think it would do well, congrats on a real novel idea that's past it's first test with flying colors.

[SS90]

OK,, well done so far Teezee..... I too didn't expect it to idle so well!

The "flat spot" however, I expected (and I guess you did too).

We have discussed the inlet resonance etc neigh on a year ago...... I suspect we will be back to that.

how much "stand off" (amount of fuel/oil mixture) is coming out the carb when you are in the "flat spot" you mentioned?

Looking at your picture, I was making the assumption that the "wonderful gloss" you new engine had looked a little like it was caused by the "stand off" spraying over the engine.

Am I wrong in this assumption?

If it is though, no jetting will fix that, only finding a solution to the resonance this plenum has.

Nice legs by the way!