ESE's works engine tuner

[lodgernz]

I did not know Honda also had seals with coated lips. I thought it was just a Yamaha thing as my Kawasaki and Suzuki's did not have them.

One of the issues I found with Yamaha coated seals was that they would curl up in the presence of Acetone. So when I ran my 50/50 mixtures of Acetone and Methanol I had to run Suzuki crank seals.

It would probably be a good idea to soak the seals overnight in a jar of whatever fuel mix you are going to use, just to check the seals compatibility.

Should be OK. Being a good law-abiding bucket racer, I only use 98 pump gas. Don't think there's any acetone therein.

[TZ350]

Should be OK. Being a good law-abiding bucket racer, I only use 98 pump gas. Don't think there's any acetone therein.

Team ESE use fresh Av gas in their 2T Buckets because it is reliably consistent and so I have no real experience with 98. But I would be very suspicious about what sort of concoction is in it to achieve that 98 rating because it smells very nasty. I would definitely soak test the coated seals myself. Test is always best.

[speedpro]

Pretty sure there is a good % of toluol/toluene. A very good solvent.

[speedpro]

35%. that's why you can smell paint thinners when you first fire it up in the morning. It's only REALLY toxic so should be avoided if possible.

[F5 Dave]

Top tip: run some oil in there too. It helps lubricate the piston and the various crank bearings.

Don't mention it.

[lodgernz]

Top tip: run some oil in there too. It helps lubricate the piston and the various crank bearings.

Don't mention it.

I think there's some oil in the gearbox. Does that count?

[F5 Dave]

If you nick the seal it might be like autolube.

[TZ350]

If you nick the seal it might be like autolube.

The crank flapping around in the seal acts like an oil pump and will pump oil from the gear box. Its a problem with our GP's. Not sure if its poor crank alignment, the GP crank flexing at 12,000 rpm or the C3 bearings allowing the crank to hop up and down. But it will shift most of the gear box oil in a days racing.

[jonny quest]

I'm pretty sure the Viton slipped seals are primarily used for lower friction benefits.

TZ350, didn't I see a post of yours years ago where you did some seal friction experiments?

RS125 bulletin even mentions removing one of the seal clips for less friction I seem to recall

[husaberg]

I'm pretty sure the Viton slipped seals are primarily used for lower friction benefits.

TZ350, didn't I see a post of yours years ago where you did some seal friction experiments?

RS125 bulletin even mentions removing one of the seal clips for less friction I seem to recall

AFAIK Vitron is used as its one of the more durable rubbers in contact with fuel and solvents and wear. Its used on fuel needle tips as well
Teflon is a low friction seal.

[lodgernz]

The crank flapping around in the seal acts like an oil pump and will pump oil from the gear box. Its a problem with our GP's. Not sure if its poor crank alignment, the GP crank flexing at 12,000 rpm or the C3 bearings allowing the crank to hop up and down. But it will shift most of the gear box oil in a days racing.

Wow. Never seen that on my Hondas. Must be a Suzuki thing...

[philou]

the material of the seal must be adapted to the linear speed of the shaft.

nbr is not suitable for high rotational speeds. the lips are burnt.

[Flettner]

Ready to start, at last. Just got to sort through this LINK, so different to what Im used to, way more complicated than the Atom.

[jbiplane]

Hello All

I have pistons with 15mm crank pin and Suzuki AX con rods with d=18mm 18mm wide upper hole
https://www.royalrods.com.tw/suzuki-...d/RS-3012.html

Engine revs up to 8500 and have 15hp

What is better
- just put in gap 34 of 1.5mm needles as on outboards (gap about 0.024 needle to needle)
- use 15x18x22 bearing cutting inside piston from 19 to 22.5 mm to fit it
- make custom separator

[WilDun]

Ready to start, at last. Just got to sort through this LINK, so different to what Im used to, way more complicated than the Atom.

Getting there! - You are going to overtake John Britten soon with your artistic exhaust efforts !