Saving Old Seagulls

Hi guys,

Have a look at those two cylinders. Ports are different. The one with the bigger ports could produce more power?

Stelious you have to compare like for like, not a century with a silver century, I can't remember the figures now but there are probably more than 10 different cylinders for the century family.

Yes, those two cylinders are from centuries, can be only used both with a villiers carb.

Sorry yes your right, there are 4 or 5 of those, I've only built one of those for racing & I made it a twin cab one. With the high inlet cylinder, where I felt the port time areas were more favorable.

A la Raoul Lealand who came up with the idea.

Well you have started it Stelios, you have 2 different types of Century cylinder.

Picture taken from crankcase side, exhaust port at top.

Here is type 3
Anyone else got a different one?

This is Century not Century Plus, carb stub on the Starboard side.

H-A

Bridged transfer?

Horsley-Anarak wrote:Well you have started it Stelios

And I have another one from an LLS but it's on the engine.


Charles, did you say twin carb?

Charles uk wrote:Bridged transfer?

No just bridged exhaust on my one.

H-A

In a previous post about Raoul Lealand etc is mentioning something..

I found a picture Stelious

Wow, great picture! Did the engine gain power with this modification?

A little.

I'm not going to give you any of my racing secrets & figures, if I did, I'd have to shoot you!

I don't have a gun, but the other Charles does.

Do you have a spare Yamaha 4/5hp pin prop?

What for?

If it's for that 5R you will need an 8" pitch one, that has been pitched up, but the 5R should have a splined propshaft.

I am just making some fun but in the back side of my mind I have a plan to tweak a silver century.

The 5R is not in the back side of my mind yet.