NCY 61m big bore kit By clonedrone (Read 566 times)

[clonedrone]

Please
Does anyone know if the NCY 61 mm cylinder is Iron or Alum with a Iron sleeve?
Vendors aren't very helpfull
Thanks in advance

[tvnacman]

Sorry, I can only answer about what I sell.

John

[clonedrone]

What is the composition of what you sell?

[kz1000st]

I seriously doubt that anybody is replacing an aluminum barrel with pressed in iron liner with a solid iron barrel, especially for a forced-air cooled motor. The results would be catastrophic. Now an air cooled motor like my Cub clone, that's a different story.

[clonedrone]

Agreed.
I get discrepancy information from different from Vendors.
Wish I could find a BB Plated cylinder vs Iron Sleeve cylinder.
Iron is best used on the back yard BBQ for its heat retention properties. not mentioning its Thermal Expansion qualities.

[tvnacman]

The cooling fins are cast aluminum , I will check the sleeve with a magnet and get back to you .
John

[oldscootcoot]

Ive not seen a cylinder yet that wasn't aluminum with an iron/steel liner except for a few Nikasil units that would be all aluminum.

[kz1000st]

Don't get all Ga-Ga for Nikasil and other space age materials as cylinder lining. You can't re-bore nikasil and the advantages are only theoretical. I'm wildly happy with the fact that Chinese parts are so cheap. I broke a cylinder head and replaced it for $49.00. Try that with a brand name scooter and you'd be looking at several hundred bucks for a replacement.

Nikasil is great stuff but most people won't wear out either in their riding career. Besides if you think the heat transfer differences are a big deal, think about wrapping an engine in a plastic container and blowing air with a fan over it starting at the coolest part of the engine and finally having it reach the hottest part last. There's a reason Harley is running coolant only through the heads on their new motor.

[clonedrone]

Wha'st good about a Iron Boreable Cylinder if there are no oversize"s available?
I haven't found any regular over sizes (.25mm, .5mm, 1.mm etc).
Agree and Disagree, For less than the cost of a bore job a brand knew cylinder and piston kit is less costly.
Please correct me if I'm wrong.
the closest is the 58.5mm that's roughly .060 inch
I don't know if the OE sleeve will accept that.

In a mildly high perf, application there's nothing I like or "Pro" about a Iron Bore, Thermal expansion, I can run a tighter piston to cylinder clearance with a Plated bore thus greater ring seal, cooling running piston, etc, Heat dissipation, It's soft, etc,

[oldscootcoot]

Chrome bores require a specific set of rings, which complicates economy production. If not properly done can deplate and kill an engine. A lot of 2 stroke hand held stuff ran chrome bores and were very durable, but cost a bit more than their aluminum bore counterparts. A properly executed iron or steel bore will just about run for ever. I have delt with nikasil in the past in commercial engines and am no fan for sure! Ive only seen one GY6 cylinder of the type and it was about twice the cost of the traditional bore cylinder. Remember the old Briggs cool bore lawnmower engine? Piston ran in an aluminum bore. If the air filter was maintained keeping the bore clean they just about ran forever. Course they were governed to 3600rpm. Still running one on my ancient 88 Snapper mower.

[clonedrone]

Genuine Chrome bore requires a Moly type ring.More accurately Phosphate Coated Iron ring.
I haven't seen a OE Cylinder since 1979 Honda CR125 and 250.
Some old Kawasaki Sleds used Chrome, They'd flake
No issue as No O.E's or Re-Plating Co's use Chrome. (even U.S.- Chrome in WI).
Its all Nicol Silicon Carbide, theres some Phosphuros in there too, You can use a standard Stainless or TiN Coated ring.
Plated cylinders are used exclusively in all modern MX and Sport bikes.
I much prefer the Plating in the Powesports market.

I just recieved the 61mm, NCY kit, Its Alum.Cyl, with a Cast in Iron Sleeve.
I will be shipping to Swain Tech for a bunch of Coating's
Along with Cylinder head and valves.
Those Ol Briggs motors had Plated pistons.

[oldscootcoot]

Nov 6, 2013 10:29:02 GMT -6 clonedrone said:

Genuine Chrome bore requires a Moly type ring.More accurately Phosphate Coated Iron ring.
I haven't seen a OE Cylinder since 1979 Honda CR125 and 250.
Some old Kawasaki Sleds used Chrome, They'd flake
No issue as No O.E's or Re-Plating Co's use Chrome. (even U.S.- Chrome in WI).
Its all Nicol Silicon Carbide, theres some Phosphuros in there too, You can use a standard Stainless or TiN Coated ring.
Plated cylinders are used exclusively in all modern MX and Sport bikes.
I much prefer the Plating in the Powesports market.

I just recieved the 61mm, NCY kit, Its Alum.Cyl, with a Cast in Iron Sleeve.
I will be shipping to Swain Tech for a bunch of Coating's
Along with Cylinder head and valves.
Those Ol Briggs motors had Plated pistons.

Be sure to post some pics, love to see the finished product.