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Search: Posts Made By: mthill
Showing results 1 to 25 of 33
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Forum: General Boating Discussion
11-05-2008, 12:11 PM
Replies: 220
Views: 76,942
Posted By mthill

I didn't ask about fuel rate to calculate to...

I didn't ask about fuel rate to calculate to actual HP. If they haven't done it yet, they will.

Since its full-authority electronics, and the statement was made that it was running ~70 at rated...
Forum: General Boating Discussion
11-04-2008, 05:54 PM
Replies: 220
Views: 76,942
Posted By mthill

Demo rides were being offered and I was lucky...

Demo rides were being offered and I was lucky enough to get a spot on one in Ft Lauderdale. It was enlightening to say the least, and overall, I thought it was a nice package. The installation...
Forum: General Boating Discussion
11-04-2008, 03:32 PM
Replies: 5
Views: 1,191
Posted By mthill

I heard they cancelled a huge space at the...

I heard they cancelled a huge space at the convention center after Brunswick's 3rd qtr filings revealed how bad things are getting for them. That's just the rumor mill at the show...
Forum: General Boating Discussion
10-10-2008, 05:41 PM
Replies: 9
Views: 903
Posted By mthill

It's not that big of a deal to get in. Just go...

It's not that big of a deal to get in. Just go to Vistaprint (or whatever free business card company you want) and make up a card with your name and an automotive sounding company name. Register...
Forum: General Boating Discussion
10-09-2008, 10:05 AM
Replies: 404
Views: 264,480
Posted By mthill

The VGT might do it. You can close the vanes...

The VGT might do it. You can close the vanes down to build boost virtually at idle. There's a limit because exhaust backpressure goes through the roof. It's not a trivial task to balance the two....
Forum: General Boating Discussion
10-08-2008, 06:07 PM
Replies: 404
Views: 264,480
Posted By mthill

Your explanation is good. When we look at...

Your explanation is good.

When we look at dyno curves, it's always a combination of points taken at steady state. No information regarding the transient behavior of the engine is known.

I...
Forum: General Boating Discussion
10-08-2008, 03:37 PM
Replies: 404
Views: 264,480
Posted By mthill

You're right. I was looking at 2000 rpm for the...

You're right. I was looking at 2000 rpm for the Cummins. But, the charts I posted have the right values.

I can't figure out how the Volvo could provide better performance than the QSB, assuming...
Forum: General Boating Discussion
10-08-2008, 10:30 AM
Replies: 404
Views: 264,480
Posted By mthill

See attachments. Normalized HP shows how...

See attachments.

Normalized HP shows how similar the power curves are.

Normalized torque reveals that the Cummins should have an advantage of the Volvo.

Comments?
Forum: General Boating Discussion
10-08-2008, 10:24 AM
Replies: 404
Views: 264,480
Posted By mthill

So at the most basic level, what moves the boat...

So at the most basic level, what moves the boat if not horsepower?

In my mind, the ability of an engine to accelerate a boat is seen on paper as the difference between available hp and the prop...
Forum: General Boating Discussion
10-07-2008, 05:20 PM
Replies: 404
Views: 264,480
Posted By mthill

Should this be construed as fact or opinion? It...

Should this be construed as fact or opinion? It sounds like an rude question, but I don't mean it that way.

Speaking as an observer, the advertised power curves for the D6-435 and the QSB 425 are...
Forum: General Boating Discussion
05-02-2008, 02:05 PM
Replies: 10
Views: 2,225
Posted By mthill

People are certainly experimenting with it in...

People are certainly experimenting with it in automotive applications. Octane for E85 is somewhere north of 100, maybe 105 or so? Optimizing an engine for this will certainly result in power gains...
Forum: General Boating Discussion
04-29-2008, 01:20 PM
Replies: 404
Views: 264,480
Posted By mthill

Sort of. As najwb said, it's slightly more...

Sort of. As najwb said, it's slightly more complicated than that. I'll admit that BSFC isn't all that different, by VE can have a reasonable impact.

That said, dealing with the heat of...
Forum: General Boating Discussion
04-29-2008, 12:13 PM
Replies: 404
Views: 264,480
Posted By mthill

Firefox, we must be misreading each others posts....

Firefox, we must be misreading each others posts. That's the only explanation for your most recent response.

I didn't misstate the TBO of a C15, I've never even considered what it might be. I...
Forum: General Boating Discussion
04-29-2008, 12:22 AM
Replies: 404
Views: 264,480
Posted By mthill

Comparing TBOs between engines with completely...

Comparing TBOs between engines with completely different intended uses isn't really fair I suppose. It goes both ways. You can design an engine for 1,000,000 mile or a 1/4 mile TBO. Each will have...
Forum: General Boating Discussion
04-28-2008, 06:18 PM
Replies: 404
Views: 264,480
Posted By mthill

That doesn't address the point he made about...

That doesn't address the point he made about weight. A C9 Acert, according to the Cat handbook I have in front of me, with an E rating will make 567bhp @ 2500rpm. But the thing weighs a...
Forum: Members On-line Video Section!!
04-12-2008, 11:49 PM
Replies: 40
Views: 10,431
Posted By mthill

That boat is stunning, even in plain white. ...

That boat is stunning, even in plain white. Awesome.
Forum: General Boating Discussion
04-12-2008, 11:35 PM
Replies: 249
Views: 40,431
Posted By mthill

I understand. It's a project you were/are...

I understand. It's a project you were/are clearly passionate about and it's too bad it never came to completion. It's amazing how timing can affect the success of a good idea. A lot of things have...
Forum: General Boating Discussion
04-11-2008, 06:17 PM
Replies: 249
Views: 40,431
Posted By mthill

I didn't find the post you referred to, but it...

I didn't find the post you referred to, but it doesn't matter, I know this stuff is nothing new.

I didn't mean to imply that the overdrive boxes never existed, but it's not like I can just go out...
Forum: General Boating Discussion
04-11-2008, 03:25 PM
Replies: 249
Views: 40,431
Posted By mthill

Essentially, each choice is a compromise in one...

Essentially, each choice is a compromise in one way or another. A big low slip prop would be good for long distance cruising, but hurt responsiveness.

I think most boat builders know what prop...
Forum: General Boating Discussion
04-11-2008, 01:35 PM
Replies: 249
Views: 40,431
Posted By mthill

You're right, I'll edit the original. I think...

You're right, I'll edit the original. I think the point holds true, that changing the prop alone isn't a great idea.
Forum: General Boating Discussion
04-11-2008, 12:55 PM
Replies: 249
Views: 40,431
Posted By mthill

High Perforamnce Boating with Diesel Engines

I promised to post this a week of two ago, but things got busy for me. This is my take on diesel vs gasoline. Comments are welcome and encouraged.

Horsepower moves the boat. More horsepower...
Forum: General Boating Discussion
03-27-2008, 11:07 AM
Replies: 43
Views: 10,465
Posted By mthill

Modern VG turbos are extremely durable and are...

Modern VG turbos are extremely durable and are meant to be constantly cycled. The newest engines use the VG to help control emissions, with a side benefit of performance. All 3 major pickup truck...
Forum: General Boating Discussion
03-25-2008, 10:18 AM
Replies: 43
Views: 10,465
Posted By mthill

Your posts were a big reason I finally crossed...

Your posts were a big reason I finally crossed over from lurker to poster. We share many opinions, yours formed through years of experience and mine through an unusual amount of time thinking about...
Forum: General Boating Discussion
03-24-2008, 05:53 PM
Replies: 43
Views: 10,465
Posted By mthill

Absolutely, and I think this is one factor that...

Absolutely, and I think this is one factor that people are considering when looking at diesels. You can back a diesel off 10-15% and be in a range where the mfg calls it "cruise" and run all day. I...
Forum: General Boating Discussion
03-24-2008, 12:17 PM
Replies: 43
Views: 10,465
Posted By mthill

Of course the diesel will make more torque, maybe...

Of course the diesel will make more torque, maybe even 2:1. But what does that have to do with top speed? Horsepower is what determines the terminal velocity, where the power available to propel...
Showing results 1 to 25 of 33
 
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