props

[deacon bruce]

I have a propeller kicking around my shop and not sure what to do with it. I have a Silver Century and am now running a four blade rounded tip prop on the motor and seems to be OK. But I am interested if the other 12 1/2 five bladed square end prop would make any difference, and if so what?

[headdownarseup]

Any pics of both types of props with the motor so we can see what you've got?

Jon

[Hugz]

Would that be the WSPC that has the 3 fastener gearbox cap? If so l believe the 5 bladed hydrofan gives a little better performance than the clover weed free prop.

[deacon bruce]

how do i get pics on here?

Crankcase is CPCL

Gear case is 2 screw

5 blade prop says CPC5

Now what?

[Hugz]

Tap on attachments below and then add file or drag into the post or use a photo hosting site such as photobucket and copy and paste the link into the post.

Your crankcase number indicates it is Century rather than a Silver Century. How many turns does the motor have to turn to rotate the prop once?

[deacon bruce]

been away a bit. Here's an attempt at pics. If necessary I will do the flywhaeel prop rotation drill.

[Charles uk]

The 5 bladed prop is the right hydrofan for your motor & gearbox!

Providing no one has changed your lower unit for a different ratio one.

[headdownarseup]

The carb is a bit of a miss-match for the motor.
It will still run plenty good enough though.
Just saying..

Jon

[deacon bruce]

Jon: which carb do you suggest? I may have parts enough for another.

[Hugz]

The block has been replaced with a silver century block that features the carb on the starboard side to suit the Amal whereas the original would have carb on the port side with a villiers carb. I think I'm correct on this. Centuries aren't really my thing

[Charles uk]

Your right Hugo, right carb for that cylinder providing it's a 416 with a 95 jet & not running 10:1, should run real nice.

[deacon bruce]

Not meaning to be sarcastic and upset the gentle tone of the forum, what difference will it make? The motor is bodgered anyway

[deacon bruce]

Hugz:

It's a 416. By 10:1 I assume you mean petrol/oil ratio?

[Charles uk]

The Silver Century cylinder has a larger inlet port & carb 16mm compared to the Century 100 12.7mm so it would be reasonable to expect more power at wide open throttle.

10:1 petrol oil ratio.

[headdownarseup]

Have you tried this motor out yet on the water?

As you see things it might actually be ok as is.
For this to be an authentic CPCL the cylinder would normally have provision for the carb mounted on the same side as the tiller. The normal carbs for this motor type would be a Villiers, same as the smaller 40 series motors as the guys have already mentioned.
But for some reason yours has a later Silver Century cylinder along with a later 416 Amal carb.
Unless you can remove the current cylinder from the crankcase it's going to be difficult for you to see why it's different INTERNALLY.
It might run perfectly well in its current state. Try it and see
All depends on how fussy you want to be.

Looking a bit closer at your pics i can see the clutch lever is also from something a bit newer,possibly a later type century.The positioning of the clutch is also slightly wrong too. They're normally mounted on the same side as the tiller.Not that this small detail will affect how the motor runs however. As you say, it's a bit bodgered.

Jon