Marine Engine debate

[Jon Fuller]

Originally posted by Captain Chaos
thankyou Si,

Matt refers to a 7.4L above as a small

overbored, over stroked small block

[Captain Chaos]

I should av asked that question 5 years ago.

thanks all.

so whilst i think of it, ecomomical issues aside, would you lot recommend a 3.0L over a 2.5 then?

[Jon Fuller]

Who you asking

[Jon Fuller]

I'd reccomend a 15cc strimmer motor, with a 6-71 blower, you'll never match that power to weight!

[Captain Chaos]

silly man

[Cookee]

Originally posted by Too Old
I assume you took the time to read the specs on the rotaty marine applications?

You find that kind of horsepower "attractive"?

Attractive for what?

Marine 7" Supercharger setup with a 390 Holley.

Peak torque is 184ft/lb @6700rpm

Peak Horsepower is 275hp at 8500rpm

Glad you asked Too Old!

Ignoring Jonny for a moment (I know it's his forum but bear with me!)

On the race boat we run a Mercury XR2 outboard V6 2 litre giving allegedly 200 hp if you're lucky. On the leisure version of the same hull - a 7.2m RIB we are fitting a 225 hp 3 litre outboard.

Getting back to Jonny's comments about being new to this I havn't got a clue what the torque figures are for the outboards but we get 72 mph from the race boat with a 2 litre 2 stroke which isn't very torquey at all!

Therefore for my application a Mazda COULD work for me, and as a manufacturer it would be nice to offer other options although it is a bit "out there", and the spares / servicing situation would probably put people off anyway but there again most of these conversations end up being hypothetical anyway!

ps might have a word about those trim tabs this week ......

[Jon Fuller]

The torque curve of a 2, 2.5, or 3 litre 2 stroke of this type, is probably far flatter than you might think.

[Cookee]

Originally posted by Jonny
The torque curve of a 2, 2.5, or 3 litre 2 stroke of this type, is probably far flatter than you might think.

Compared to the Rotary Mazda? And that's Mr Cooke with an "E" by the way!

[Ben]

Originally posted by Jonny
There are generaly, for each manufacturer, a family of motors based on a dimensionaly smaller block, and a family based on a larger block.

for example, chevy have done many engines based on their basic 'small block' casting such as 305 ci, 350ci & up to 377ci, with much larger capacities possible with special aftermarket parts

And many engines based on the big block casting ie, 454ci, 502ci, 540ci, 572ci etc, again, many options larger based on special parts.

the same principle goes for Ford and Chrysler, with of course, their own choices of capacity.

And to further confuse matters, Chevrolet has done a 396ci big block and a 400ci small block.

Now time for a bit more information overload. Standard small and big block engines offered by Mopar (Chrysler, Dodge & Plymouth), Ford and GM (Chevrolet) over the years or currently available. I won't get into other divisions within each company i.e. Lincoln (Ford) or Cadillac, Pontiac, Oldsmobile (GM). All are in cubic inches

Mopar small block family: 273, 288 318, 340, 360
Mopar big block family: 361, 383, 400, 426, 440
Mopar hemi family: 331, 350, 392, 426

Chevrolet small block family: 265 (the original small block), 283, 302, 305, 307, 327, 350, 377, 400
Chevrolet big block family: 348, 396-402, 409, 427, 454, 496, 502

Ford small block family: 260, 281 289, 302, 305, 330, 351C, 351W,
Ford big block family: 352, 390, 406, 427, 427 SOHC, 428, 429, 429 Hemi (Boss), 460.
Ford Y block family: 292, 312

Which ones am I forgetting 'Too Old'?

[Jon Fuller]

I'm too old to take all that in!

[Captain Chaos]

where does "new kids on the block" fit into all that??

Cheers Ben, thats one to print off and keep...

[Captain Chaos]

Matt, I'll refrain from giving you BOD abuse

[Captain Chaos]

you shouldnt know stuff like that Matt..........Its not good for your image...........especially being in IT!

[Captain Chaos]

mmmmh Doughnuts

[Ben]

Originally posted by Matt
383 chevy small block, or does that not count cos it's a 400 crank in a 350 block.

Exactly right. I only included standard (non stroker) from the factory engines.

[Ben]

Originally posted by Matt
Ben, what's a Y block?

Fords' first OHV V8 built as the replacement for the flathead. They came out in the early 50s and were built until the early 60s.

Ford made the bottom of the block very deep and thick with the idea of giving the bottom end more strength. The result - it looks like a Y.

[Ben]

The intake ports were rather interesting also.

[Captain Chaos]

coooooooool

[Jon Fuller]

like a Lotus 907

[Too Old]

Originally posted by Ben
And to further confuse matters, Chevrolet has done a 396ci big block and a 400ci small block.

Now time for a bit more information overload. Standard small and big block engines offered by Mopar (Chrysler, Dodge & Plymouth), Ford and GM (Chevrolet) over the years or currently available. I won't get into other divisions within each company i.e. Lincoln (Ford) or Cadillac, Pontiac, Oldsmobile (GM). All are in cubic inches

Mopar small block family: 273, 288 318, 340, 360
Mopar big block family: 361, 383, 400, 426, 440
Mopar hemi family: 331, 350, 392, 426

Chevrolet small block family: 265 (the original small block), 283, 302, 305, 307, 327, 350, 377, 400
Chevrolet big block family: 348, 396-402, 409, 427, 454, 496, 502

Ford small block family: 260, 281 289, 302, 305, 330, 351C, 351W,
Ford big block family: 352, 390, 406, 427, 427 SOHC, 428, 429, 429 Hemi (Boss), 460.
Ford Y block family: 292, 312

Which ones am I forgetting 'Too Old'?

Don't forget we have tall deck as well as standard deck blocks too.

Are we confused yet?