Search found 1800 matches

by digginfool
Wed Jun 13, 2018 10:42 am
Forum: Automotive Power Only
Topic: Exhaust Cones
Replies: 6
Views: 279

Exhaust Cones

Has anybody ever used exhaust cone inserts like the Vortex? I recently had to ditch my mufflers due to excessive back pressure. Right now running open exhaust (I have 4 feet of 3" flex pipe after the headers) which I'm sure doesn't make me any fans. I don't see how an insert could reduce sound ...
by digginfool
Wed Jun 06, 2018 8:28 am
Forum: Automotive Power Only
Topic: Need help with 454
Replies: 55
Views: 2472

Re: Need help with 454

To clarify what I meant. If a props rpm range Is say 1750-2250 like the whirlwind sw and your spinning the prop 2000 rpm in the middle of its pitch range, why does it matter if the motor has a 2:1 and is doing 4000 rpm or a 2.3 and doing 4600 or a 2.5 and doing 5000 rpm. The prop speed and pitch st...
by digginfool
Fri Jun 01, 2018 8:16 am
Forum: Airboat Talk
Topic: Pace Maker Electronic Ignition a/c boat
Replies: 18
Views: 1147

Re: Pace Maker Electronic Ignition a/c boat

4) I am not the first person who has had a module go bad. When I talked to the guy who installed it, he said EVERY ONE he has seen with that problem has some other issue that led to voltage drop/jump. So after he said that I finally looked into why she had burnt up 2 main power switched and was get...
by digginfool
Fri May 25, 2018 10:48 pm
Forum: Airboat Talk
Topic: Miccosukee res, water or not
Replies: 40
Views: 2116

Re: Miccosukee res, water or not

I bet we got 3 to 4 inches in Coral Springs and the radar showed the heaviest rain out west of us. I don't see any way they won't be closing 3A and the Indian lands next week. For the last 3 or 4 weeks they've been dumping water into 2A. From there it goes out through the Hillsboro canal, the C14 or...
by digginfool
Wed May 09, 2018 8:54 am
Forum: Airboat Talk
Topic: AND The Saga Continues, V. 2.0
Replies: 9
Views: 1051

AND The Saga Continues, V. 2.0

I'm starting to hate carmotor boats. My aircraft boat ran for years without any serious issues save for one starter and a prop mounting plate. My carmotor boat has nearly made me famous. :lol: So, back on February 24, I'm out riding with four other boats late at night when we decide to head to anoth...
by digginfool
Tue Apr 17, 2018 12:01 pm
Forum: Automotive Power Only
Topic: 496 vs 540 BBC
Replies: 7
Views: 460

Re: 496 vs 540 BBC

I was in the middle of a little more involved answer but mouse is correct; the 1050 is probably your best bet between the two. But, one way to look at it is that a BBC is probably not going to be set up to turn more than 5,400 RPM. With that in mind, every two revolutions will have completed the cyc...
by digginfool
Mon Apr 16, 2018 12:19 pm
Forum: Automotive Power Only
Topic: 496 vs 540 BBC
Replies: 7
Views: 460

Re: 496 vs 540 BBC

First, no substitute for cubic inches. Second, I would go with the 2.3 ratio. That's a big boat and you'll be able to turn more prop with the higher ratio. Also, it seems the 496 is built for higher RPM performance which is not necessarily what you're looking for in an airboat engine. You want a wid...
by digginfool
Fri Apr 13, 2018 5:14 pm
Forum: Automotive Power Only
Topic: LSA reliability
Replies: 25
Views: 1325

Re: LSA reliability

I've got a sled for when it's just the wife and me but when we're going to bring extra or building supplies to camp, need the DB.

Sent from my [device_name] using [url]Southern Airboat mobile app powered by Tapatalk[/url]
by digginfool
Thu Apr 12, 2018 5:25 pm
Forum: Automotive Power Only
Topic: LSA reliability
Replies: 25
Views: 1325

Re: LSA reliability

OneBFC, my last point sums up the argument everyone has made with you regarding this subject. An automobile, or even a truck, is under less load at the same engine speed as an airboat is for all but the lightest of boats. I would guestimate my airboat weighs in the vicinity of 3,000 lbs. Easy. Fifte...
by digginfool
Thu Apr 12, 2018 3:48 pm
Forum: Automotive Power Only
Topic: LSA reliability
Replies: 25
Views: 1325

Re: LSA reliability

OneBFC, you've repeated that many times but it may not necessarily be true for every application. Using Diacom, I can monitor all aspects of my engine. I'm turning an 81.5 inch 4 blade NGR and at 3,400 RPM, a typical cruise speed for me, I'm pulling 4.1 psi boost, burning 10.73 gph. At 3,800 RPM, wh...
by digginfool
Thu Apr 12, 2018 9:14 am
Forum: Automotive Power Only
Topic: LSA reliability
Replies: 25
Views: 1325

Re: LSA reliability

So, being an LSA owner myself, here's my take on the engine. First, there are many people who have had good results with them. A buddy of mine uses one on his 18 ft tour boat and probably has a couple thousand hours on his by now with only one minor issue. He is very conscientious about maintenance ...
by digginfool
Mon Apr 02, 2018 5:00 pm
Forum: Automotive Power Only
Topic: Waterthunder engine prices
Replies: 8
Views: 1226

Re: Waterthunder engine prices

Seven3 wrote:Dave will talk to you if you call. I called last week and he was very nice, answered all of my questions. It was just over 16k for the engine you are describing, with fully forged internals.


Look at you! You're serious about going CM, aren't you?
by digginfool
Wed Mar 28, 2018 8:11 am
Forum: Prop Talk
Topic: Prop weight...
Replies: 11
Views: 566

Re: Prop weight...

Gary S wrote:The weight of the hub is center weight, doesn't take as much to spin it. Blades are a lot lighter and can be spun up faster.


Absolutely correct. The more weight and the farther it is from the center of rotation, the more power it takes to accelerate. Simple physics.
by digginfool
Mon Mar 26, 2018 10:58 am
Forum: Airboat Talk
Topic: which big block would you use
Replies: 3
Views: 473

Re: which big block would you use

No substitute for cubic inches.
by digginfool
Thu Mar 08, 2018 12:00 pm
Forum: Florida Airboaters
Topic: Tree House
Replies: 3
Views: 497

Re: Tree House

Some things never change. I made a post about 5 years ago for the same issue. Damn shame people can't pick up after themselves.
by digginfool
Sun Mar 04, 2018 5:51 pm
Forum: Automotive Power Only
Topic: 502 power VS torque
Replies: 177
Views: 5167

Re: 502 power VS torque

Abrams M1 tank engine peak torque is 395 lb-ft. At peak hp torque is 275 lb-ft. And by the time you gear down the RPM from the gas turbine running, what, 30,000, to a usable value I'll bet the torque is 10 times that value before it hits the tranny. Sent from my [device_name] using [url]Southern Ai...
by digginfool
Fri Mar 02, 2018 4:41 pm
Forum: Automotive Power Only
Topic: 502 power VS torque
Replies: 177
Views: 5167

Re: 502 power VS torque

Have you ever noticed that a lot of times, the best way to get the boat moving is to stomp the accelerator and turn the rudder hard to make the boat jump on a turn? It will jump initially but then might stall out, standing on the throttle after that does nothing more, unless you rock the rudder. Yo...
by digginfool
Thu Feb 22, 2018 12:22 pm
Forum: Automotive Power Only
Topic: 502 power VS torque
Replies: 177
Views: 5167

Re: 502 power VS torque

Carmotor, I would be interested seeing ur same thrust test repeated with a 4 blade JX to see if it requires more or less hp to make same or more thrust. As you approached MBT, you Gained 200 lbs in several hundred (300) rpms. This is typical of a engine that's built for performance not economy. It ...
by digginfool
Thu Feb 22, 2018 8:18 am
Forum: Automotive Power Only
Topic: Fuel Injector Help
Replies: 8
Views: 297

Re: Fuel Injector Help

Diggn, if you have the ability to adjust fuel pressure, keep adding pressure until the ms comes down. But something is wrong here. No reason the injectors gm supplies with the engine wouldnt be enough. Maybe they need cleaning, or fuel filter plugged, or u have low fuel pressure, fuel line too smal...
by digginfool
Wed Feb 21, 2018 9:02 pm
Forum: Automotive Power Only
Topic: Fuel Injector Help
Replies: 8
Views: 297

Fuel Injector Help

Ran Diacom on my engine again today and once again I've found a very disconcerting data point. The pulse width for my fuel injectors is hitting 23 ms. This is way too much as the maximum these injectors should see is 18 ms (they are rated at 54 lbs/hr). As much as I despise the MEFI system, I have d...
by digginfool
Wed Feb 21, 2018 10:25 am
Forum: Automotive Power Only
Topic: 502 power VS torque
Replies: 177
Views: 5167

Re: 502 power VS torque

Probably one of the easiest ways to reconcile the difference between HP and Torque is torque accelerates, HP holds.
by digginfool
Wed Feb 21, 2018 10:22 am
Forum: Automotive Power Only
Topic: 502 power VS torque
Replies: 177
Views: 5167

Re: 502 power VS torque

On another note can one of you fuzzy math geniuses educate me on the 5250 dynamic? Why does horsepower "always" eclipse torque at an rpm above 5250 and as as such would torque not then be more relevant to usable power and therefore of more value in an airboat? I'm not going to go into the...
by digginfool
Sun Feb 18, 2018 8:20 pm
Forum: Automotive Power Only
Topic: Airboat Engine Builds - Automotive
Replies: 74
Views: 3279

Re: Airboat Engine Builds - Automotive

we kinda got on the wrong trail Well, I was one of the boats running with loudmouse on Saturday loudmouse now we know why you got lost and had to run the sh*t outta your twins!! :stirpot: :stirpot: I'm not so sure about that. Can't blame nobody but the mouse for that move![emoji12] Sent from my [de...
by digginfool
Sun Feb 18, 2018 2:56 pm
Forum: Automotive Power Only
Topic: Airboat Engine Builds - Automotive
Replies: 74
Views: 3279

Re: Airboat Engine Builds - Automotive

Well, I was one of the boats running with loudmouse on Saturday and his boat is beast. He climbed the Ridge just barely patting the throttle and went everywhere he wanted go (almost. - [emoji41]). He's a really great guy and look forward to spending time with him and Mrs. Mouse soon! Enjoyed the day...
by digginfool
Wed Feb 14, 2018 1:11 pm
Forum: Automotive Power Only
Topic: Airboat Engine Builds - Automotive
Replies: 74
Views: 3279

Re: Airboat Engine Builds - Automotive

Diggn, my boat runs ground with 4 adults, full cooler 40 gallons of fuel at 3000 rpms or less at 15' welded deckover. I've not seen many boats that even come close. Be honest. The LSX is a purpose-built platform designed for high HP applications. Yes, you can get it with an iron crank but I'm betti...

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