Enhanced Manifold Exhaust Flange

[hanleyclifford]

I would like to see the exhaust flange offered in the catalog opened up for 1 1/2" NPT which would match the manifold casting. An adapter could then be added for those who wish to continue blocking off a third of the exhaust flow cross sectional area.

[joe_db]

Could we just drill out the current one?

I would like to see the exhaust flange offered in the catalog opened up for 1 1/2" NPT which would match the manifold casting. An adapter could then be added for those who wish to continue blocking off a third of the exhaust flow cross sectional area.

[hanleyclifford]

Could we just drill out the current one?

That is exactly what I did but the cost of a 1 1/2" NPT pipe tap is around $50. Maybe a plumber friend would loan you one.

[joe_db]

Did you cut the gasket bigger?
I think a local machine shop might drill mine for less than the cost of a pipe tap.

That is exactly what I did but the cost of a 1 1/2" NPT pipe tap is around $50. Maybe a plumber friend would loan you one.

[hanleyclifford]

Did you cut the gasket bigger?
I think a local machine shop might drill mine for less than the cost of a pipe tap.

If memory serves, the gasket matches the manifold size, not the flange. For a machine shop the modification will be a piece of cake.

[Dave Neptune]

Opinion oh boy

I don't think you would notice any differanc on a direct drive set up and seriously doubt that it would be noticeable on a hi-rpm reduction set up unless you were running a dry stack. That little engine just doesn't pump that much air even at 30HP.
As I have bragged and I'll bet my old tired A-4's performance numbers with 25' 1 1/4 pipe 1 1/2" hose will beat or meet anyones.
I'm open for attack.

Dave Neptune

[hanleyclifford]

You're On!

Meet me at Mile "0" on the ICW and I'll blow your doors off, bridge to bridge.

[lat 64]

Race him for pinks dude, You can take him!
So-Cal rodder meets Yankee tinker—match up of the century.
Dave probably has lake pipes running along his boot stripe.

Anyone seen my Lucky Strikes?

[Dave Neptune]

Ooh yeh!

That's a challenge I'd love to participate in. Although the reduction unit and put more power to the water via another 8-900 RPM's. We probably weigh about the same so it would be a good comparison side by side on the course. Unfortunately my neck is sore so I won't be able to look back to see the look on your face.
Actually mine would probably expire if I pushe it for long to the wood. How far between the bridges?
Oh yeh, Hanley will you be using my prop?

Dave Neptune So. Cal.

[sastanley]

What I wouldn't give for a 2:1 reduction drive without the "V".

[edwardc]

Yes, the v-drive is both a curse and a blessing. Those extra rpms really do make a power difference.

I did some speed trials yesterday, and on flat calm water with no wind, wide open throttle stabilized at 3100 rpm and 6.7 kts. And its a heavy boat. 32.3 ft and 12,800 lbs. Hull speed is just a hair over 7 kts, so I'm pretty satisfied with 6.7.

And, oh yes. I've got a 1 1/4" exhaust system.

[hanleyclifford]

Yeah, heh heh, secret weapon - The Prop.

[lat 64]

So tru mon. All de ponies in da worl' don' mean nuttun if you don' hook up.

I hear da Boss singin in my head jus now.

...We shut `em up and then we shut `em down..

[Kelly]

Oooooh...the trash talk! I love it! Imagine getting all excited about 10 miles per hour!!

[ndutton]

Oooooh...the trash talk! I love it! Imagine getting all excited about 10 miles per hour!!

Kinda like the elderly racing their Rascal scooters. Or a foot race in walkers.