ESE's works engine tuner

[F5 Dave]

Speaking for Rob, I think an important Part of the experiment was a direct comparison with the same barrel. Interesting swap of induction.

[wobbly]

Yea but all it confirmed was that the original crap reed assisted piston port was exactly that , crap , and that an EngMod optimized RV was exactly as it should be - far superior.
But as Rob said earlier on , all it needs now is an optimized pipe and then the real capabilities will be realized.

[husaberg]

Yea but all it confirmed was that the original crap reed assisted piston port was exactly that , crap , and that an EngMod optimized RV was exactly as it should be - far superior.
But as Rob said earlier on , all it needs now is an optimized pipe and then the real capabilities will be realized.

I am not totally sure but Honda were running case reed on the works CR's in thee mid 70's Marty Smith Era.
Suzuki went with their system as likely the best driveability compromise whilst avoiding whoever's patents had the Case reed.
Anyone know who had the case reed patent?
i remember old 50's two strokes with carbs feeding crankcase and mayb chainsaws i think some scooters, but on performance bikes?

I just dug up the honda one and i was Suzuki style.

[andreas]

Yea but all it confirmed was that the original crap reed assisted piston port was exactly that , crap , and that an EngMod optimized RV was exactly as it should be - far superior.
But as Rob said earlier on , all it needs now is an optimized pipe and then the real capabilities will be realized.

I'm not saying it works as well as a rotary valve, it's a remarkable project from Rob, but look at the picture- it's completely standard, How can it be compared to a purpous built RV.

[Strokerhaus]

I am most likely wrong but doesn't the the lectron atomise the fuel better?

I've also wondered if we were to grind the flat into a keihin's needle (and prevent the needle from rotating)
Would it preform similarly

Ron Gardner who made the first carb that I know of with a flat on needle, which Lectron and other's copied, started in 1947 exactly that way with a standard carb. In his case it was an AMAL carb with a round needle and flat on . Yes the flat on the needle does atomise the fuel better as it forms a spray bar, and yes you do have to prevent the needle rotation.

I have a brace of Gardner's on my TZ and got down on a dyno to A/F ratios of 15:1 with no sign of det before I chickened out.

[Frits Overmars]

Just when I thought I was starting to understand two-strokes...

[Muhr]

Ron Gardner who made the first carb that I know of with a flat on needle, which Lectron and other's copied, started in 1947 exactly that way with a standard carb. In his case it was an AMAL carb with a round needle and flat on . Yes the flat on the needle does atomise the fuel better as it forms a spray bar, and yes you do have to prevent the needle rotation.

I have a brace of Gardner's on my TZ and got down on a dyno to A/F ratios of 15:1 with no sign of det before I chickened out.

Here with a regular needle (round) note that the exhaust temp and lambda are on the same graph, see left / right

[husaberg]

Just when I thought I was starting to understand two-strokes...

It was 1974 those were different times.....So i am told.
They had Fuel injection at that time as well on some of the Honda MX bikes


Found some pics

[wobbly]

He might be onto something Frits - I will have a go at putting the rear cone at the front of the pipe.

[Grumph]

He might be onto something Frits - I will have a go at putting the rear cone at the front of the pipe.

The article says they're "unique" i vote for them to stay that way.

[SwePatrick]

80% exhaust width, it will come at a cost. I had it working with a L-ring ( if this, or ring material helped, not known). Just changing the ring gap location , I don't think will do much, furthermore it will present a big risk of ring/cylinder havoc, as the C port divider, I think, is too small to support the gap.
The induction system on these suzukis I'm convinced is very good, the only drawback being that wonky C-port feed from the B-ducts. So if the rotary thing is permanent, then it would be a good idea to give it a proper C-duct.

You can run just fine with ring gap location 6 o´clock, straight above a unbridged c-port, nemas problemas.

[andreas]

It doesn't look very unbridged.

[Larry Wiechman]

The technical writing found in the dirt bike comic books rivals the quality of the information found on Fakebook.

[TZ350]

Reed block fills up quite a bit of the crankcase.



For more crankcase volume I removed the reed block and filled up the inlet tract.



Blue line is with reed block in place, Red line is extra crankcase volume with the reed block removed. No other changes at all.

I have some 10mm longer rods coming, it will be interesting to see if even more crankcase volume helps.

I probably can only get away with this on my rotary valve engine.

[SwePatrick]

It doesn't look very unbridged.

Yes,, and IF you can run it with no bridge, you can certanly run it with a small bridge also.