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Search: Posts Made By: Njawb
Showing results 1 to 25 of 67
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Forum: General Boating Discussion
06-27-2008, 06:45 AM
Replies: 4
Views: 1,500
Posted By Njawb

New, lightweight LS smallblock offering

A 415 ci marine engine with VVT (http://ls1tech.com/forums/showthread.php?t=944422) from Mast Motorsports (http://www.mastmotorsports.com/). I don't know whether they are partnering with Raylar on...
Forum: General Boating Discussion
05-17-2008, 08:24 AM
Replies: 29
Views: 8,114
Posted By Njawb

Well, there's biodiesel and there's biodiesel. ...

Well, there's biodiesel and there's biodiesel. There is a world of difference between "grease car" fuel that is little more than used and filtered fryer oil and 5% bio blends. We really shouldn't...
Forum: General Boating Discussion
05-02-2008, 03:07 PM
Replies: 10
Views: 2,302
Posted By Njawb

Which doesn't rule out ethanol, but only ethanol...

Which doesn't rule out ethanol, but only ethanol produced from food crops.
Forum: General Boating Discussion
05-02-2008, 01:28 PM
Replies: 10
Views: 2,302
Posted By Njawb

...if your measure of return is fuel economy.

...if your measure of return is fuel economy.
Forum: General Boating Discussion
05-02-2008, 10:16 AM
Replies: 404
Views: 267,082
Posted By Njawb

Sure I do. Do you have one that makes any sense?

Sure I do. Do you have one that makes any sense?
Forum: General Boating Discussion
05-01-2008, 06:34 AM
Replies: 404
Views: 267,082
Posted By Njawb

One of us is.

One of us is.
Forum: General Boating Discussion
04-30-2008, 05:45 PM
Replies: 404
Views: 267,082
Posted By Njawb

You really don't know what you are talking about,...

You really don't know what you are talking about, do you?
Forum: General Boating Discussion
04-30-2008, 08:36 AM
Replies: 13
Views: 2,467
Posted By Njawb

Not air bubbles. The surface roughness can add...

Not air bubbles. The surface roughness can add energy to what would otherwise be a more stagnant boundary layer. That can delay the onset of turbulent flow.
Forum: General Boating Discussion
04-30-2008, 08:25 AM
Replies: 13
Views: 2,467
Posted By Njawb

It is not a simple subject, but yes, some kinds...

It is not a simple subject, but yes, some kinds of surface roughness can delay the transition from smooth (laminar) to turbulent flow over a surface. That can significantly reduce drag. The...
Forum: General Boating Discussion
04-30-2008, 07:18 AM
Replies: 404
Views: 267,082
Posted By Njawb

Still waiting for you to explain what is wrong...

Still waiting for you to explain what is wrong with cross-plane V8 harmonics....
Forum: General Boating Discussion
04-29-2008, 06:56 AM
Replies: 404
Views: 267,082
Posted By Njawb

The volumetric efficiency and brake specific fuel...

The volumetric efficiency and brake specific fuel consumption curves are not invariant across all engines.
Forum: General Boating Discussion
04-24-2008, 10:53 AM
Replies: 27
Views: 3,723
Posted By Njawb

Some. Don't get me wrong, I am certainly not...

Some.

Don't get me wrong, I am certainly not against the Audi or VW engines. Both of them have some real advantages over the Duramax. I'm just not yet convinced that their disadvantages (which...
Forum: General Boating Discussion
04-23-2008, 12:56 PM
Replies: 27
Views: 3,723
Posted By Njawb

Hard to say, since I haven't been able to find...

Hard to say, since I haven't been able to find authoritative figures published for either engine, but the overall dimensions are very similar, both are iron blocks with aluminum heads, and the...
Forum: General Boating Discussion
04-23-2008, 11:20 AM
Replies: 27
Views: 3,723
Posted By Njawb

To follow up on your prior request, Joe, I don't...

To follow up on your prior request, Joe, I don't know of any publicly available dimensioned drawings of the Audi engine, but this...
Forum: General Boating Discussion
04-23-2008, 11:15 AM
Replies: 27
Views: 3,723
Posted By Njawb

Other than more high-tech, the Audi V12 is none...

Other than more high-tech, the Audi V12 is none of those. I've also got to believe that it is considerably more expensive than the Duramax, which cuts considerably into your marketability arguments...
Forum: General Boating Discussion
04-23-2008, 08:25 AM
Replies: 27
Views: 3,723
Posted By Njawb

Oh, you want a fight? :D Not really; but I...

Oh, you want a fight? :D

Not really; but I would be interested in knowing why we are dismissing the Duramax so quickly. What makes the smaller displacement German V10 and V12 good starting places...
Forum: General Boating Discussion
04-22-2008, 12:28 PM
Replies: 27
Views: 3,723
Posted By Njawb

Very nice engine, and it fits the size...

Very nice engine, and it fits the size requirement, but can you get it in the U.S. in any form? Can you even get it in Europe without buying a complete Q7 or R8?
Forum: General Boating Discussion
04-22-2008, 07:24 AM
Replies: 27
Views: 3,723
Posted By Njawb

That makes it very tough. Even if we assume that...

That makes it very tough. Even if we assume that we are using Pat's 6-speed tranny, which is a couple of inches shorter than a Velvet Drive, that still means that the engine itself can only be about...
Forum: General Boating Discussion
04-22-2008, 07:18 AM
Replies: 249
Views: 41,387
Posted By Njawb

Have it your way, then: The MAN 16l V8 has a...

Have it your way, then: The MAN 16l V8 has a better horsepower to displacement ratio than the Cummins ISX, CAT C-15, or Detroit Diesel Series 60. :Whatever:
Forum: General Boating Discussion
04-20-2008, 01:41 PM
Replies: 249
Views: 41,387
Posted By Njawb

Good questions. How about a few more back at ya?...

Good questions. How about a few more back at ya?

Were either of the two "good V8s" you mentioned above used successfully in what you would consider to be rapid load changing applications? I'm...
Forum: General Boating Discussion
04-20-2008, 11:42 AM
Replies: 249
Views: 41,387
Posted By Njawb

You've lost me, Joe. What difference are you...

You've lost me, Joe. What difference are you looking to be made?
Forum: General Boating Discussion
04-20-2008, 11:04 AM
Replies: 249
Views: 41,387
Posted By Njawb

Don't tell 29Firefox, stirling, but those MAN and...

Don't tell 29Firefox, stirling, but those MAN and Scania V8s have a better horsepower to displacement ratio than the I6, 14.9l Cummins ISX 565.
Forum: General Boating Discussion
04-19-2008, 07:23 PM
Replies: 249
Views: 41,387
Posted By Njawb

Harmonics?

Harmonics?
Forum: General Boating Discussion
04-19-2008, 04:09 PM
Replies: 249
Views: 41,387
Posted By Njawb

Could you explain your thinking a bit more? I...

Could you explain your thinking a bit more? I can understand the main bearing support argument, but this harmonics argument makes little to no sense to me. Yes, an I6 or V12 has inherently low...
Forum: General Boating Discussion
04-19-2008, 03:35 PM
Replies: 249
Views: 41,387
Posted By Njawb

Lighten up yourself, man. I am not condescending...

Lighten up yourself, man. I am not condescending to Joe. Rather, I am objecting to his condescension in presuming to tell me why I think the potential for marine diesel V engines is exciting. In...
Showing results 1 to 25 of 67
 
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