Search found 1783 matches

by digginfool
Thu Feb 22, 2018 12:22 pm
Forum: Automotive Power Only
Topic: 502 power VS torque
Replies: 51
Views: 1163

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: 170

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: 170

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: 51
Views: 1163

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: 51
Views: 1163

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: 2378

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: 2378

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: 2378

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...
by digginfool
Wed Feb 14, 2018 12:31 pm
Forum: Automotive Power Only
Topic: Airboat Engine Builds - Automotive
Replies: 74
Views: 2378

Re: Airboat Engine Builds - Automotive

... Bottom line if you ask a motor builder that knows how to build an Airboat motor they will tell you nothing is harder on a motor than an airboat. I know that is a common belief among airboater, but it's simply not true. Ask yourself, whats harder, 1000 miles in a Baja truck or 1000 miles in an A...
by digginfool
Wed Feb 14, 2018 12:19 pm
Forum: Automotive Power Only
Topic: Airboat Engine Builds - Automotive
Replies: 74
Views: 2378

Re: Airboat Engine Builds - Automotive

Cracked pistons is a rpm or tune related failure and is a very rare problem. I don't think it is as rare as you think. After I had a hypereutectic piston shatter in my BBC, I did some research and found that it was an extremely common occurrence in the marine application of that particular motor (8...
by digginfool
Tue Feb 13, 2018 5:06 pm
Forum: Aircraft Power Only
Topic: Overheating and detonation
Replies: 33
Views: 997

Re: Overheating and detonation

Not running av gas, can’t buy it down here without a tail number of a plane is what I was told by the local airport. My timing light won’t be in for a couple of days and it is to cold too pittle with for a couple of days Nothing for nothing but you could just pick an N number from a plane sitting o...
by digginfool
Sat Feb 10, 2018 5:03 pm
Forum: Automotive Power Only
Topic: Deja Vu All Over Again
Replies: 53
Views: 1652

Re: Deja Vu All Over Again

Hell yeah, glad u figured it out. Do you think that was the problem with the first engine? The first time was a bad coil from day one. Since I never knew the engine with all 8 cylinders running, I didn't realize there waa something wrong. This time, was a bad injector and probably corrosion of some...
by digginfool
Sat Feb 10, 2018 4:31 pm
Forum: Automotive Power Only
Topic: Deja Vu All Over Again
Replies: 53
Views: 1652

Re: Deja Vu All Over Again

Glad U got it figured out Digging, for the record I am with U AC motors are the way to go. :stirpot: :stirpot: Why aren't you taking that nice sled of yours up there? Got the whole family. Sled only seats 3 plus I took the 540 off and put the 160 back on. Building a new sled for the 540. Wife said ...
by digginfool
Sat Feb 10, 2018 11:30 am
Forum: Automotive Power Only
Topic: Deja Vu All Over Again
Replies: 53
Views: 1652

Re: Deja Vu All Over Again

Well, she sure sounds pretty when she's running on all eight! 8) Tried to ohm out from injector plug to ECM and nothing. Split the injector harness from the main and it ohmed out fine. Then tried from the plug on the main harness to the ECM connector and it ohmed out. So, now I'm thinking bad ECM bu...
by digginfool
Fri Feb 09, 2018 8:51 pm
Forum: Automotive Power Only
Topic: Deja Vu All Over Again
Replies: 53
Views: 1652

Re: Deja Vu All Over Again

Can u test across the 2 pins while turning the engine over to see if the ecm is making the ground? Going to get a noid light. That will answer the question as to whether signal is reaching the injector. Unfortunately, it won't tell me where the problem is if it fails. Sent from my [device_name] usi...
by digginfool
Fri Feb 09, 2018 5:34 pm
Forum: Automotive Power Only
Topic: Deja Vu All Over Again
Replies: 53
Views: 1652

Re: Deja Vu All Over Again

Well, I spoke too fast. New injector, still not firing. Here's what is certain; I have spark, I have compression, have 12 volts on the injector plug, old injector definitely was dead. The last thing I can think of is possibly the other side of the injector circuit. The way it works is the hot side i...
by digginfool
Fri Feb 09, 2018 12:34 pm
Forum: Automotive Power Only
Topic: Deja Vu All Over Again
Replies: 53
Views: 1652

Re: Deja Vu All Over Again

Is this a GM ecm? If so is it locked? If so, I know a shop that can crack the password, unlock it and adjust the tune . Take it from my personal experience, get the ecm unlocked and have a local tuner fix it for you in an actual running situation. Sending it off and getting it back only to have the...
by digginfool
Fri Feb 09, 2018 12:31 pm
Forum: Automotive Power Only
Topic: Deja Vu All Over Again
Replies: 53
Views: 1652

Re: Deja Vu All Over Again

Okay, so the final word is definitely dead injector. Thanks to LS Matt from FB for his input. I attempted to clean the injector but it is toast. Put twelve volts to it and nothing. Thought maybe I was doing it wrong so tried the injector next to it and it buzzed like crazy. Looks like I'm doing a ne...
by digginfool
Fri Feb 09, 2018 9:41 am
Forum: Automotive Power Only
Topic: Deja Vu All Over Again
Replies: 53
Views: 1652

Re: Deja Vu All Over Again

Looks like a bad injector. Pulled the injector plug and had 12.7 volts. Now comes the fun part. Have to pull the blower lid to get the fuel rail and injectors out. AND, need to find an injector. The stock injectors are 54 lbs. From what I've read, they should be good to 680 HP but that is also prett...
by digginfool
Fri Feb 09, 2018 8:33 am
Forum: Automotive Power Only
Topic: Deja Vu All Over Again
Replies: 53
Views: 1652

Re: Deja Vu All Over Again

SWAMPHUNTER45 wrote:Is that ECM or ECU capable of accepting a custom tune ?

Would it be a DIY or will it need to be brought to someone or pulled and shipped ?

I have read some of these managment systems are locked


I have to send the ECM out to California to have it tuned. Nobody else does it.
by digginfool
Fri Feb 09, 2018 8:31 am
Forum: Automotive Power Only
Topic: Deja Vu All Over Again
Replies: 53
Views: 1652

Re: Deja Vu All Over Again

Now that makes more sense. I went back an read the first few posts and my suggestion would be to get the tune right before u burn up the engine. A boosted engine isn't going to live long lean or excessively rich in a car much less a high load application like an airboat. Jus tryn to help ya. As for...
by digginfool
Thu Feb 08, 2018 6:35 pm
Forum: Automotive Power Only
Topic: Deja Vu All Over Again
Replies: 53
Views: 1652

Re: Deja Vu All Over Again

The compression test was with throttle closed. I'll do it again with throttle open.

Sent from my [device_name] using [url]Southern Airboat mobile app powered by Tapatalk[/url]
by digginfool
Thu Feb 08, 2018 12:58 pm
Forum: Automotive Power Only
Topic: Deja Vu All Over Again
Replies: 53
Views: 1652

Re: Deja Vu All Over Again

Put an LS9 cam but still pretty tame. Blower cams generally don't have much overlap. Roughly speaking, static compression should be approximately 15 times compression ratio.

Sent from my [device_name] using [url]Southern Airboat mobile app powered by Tapatalk[/url]
by digginfool
Thu Feb 08, 2018 9:41 am
Forum: Automotive Power Only
Topic: Deja Vu All Over Again
Replies: 53
Views: 1652

Re: Deja Vu All Over Again

Checked three other cylinders and all had basically the same compression. As a last test, I checked spark and I am getting good spark from that cylinder so now there's nothing left but fuel. Bad injector or bad harness. What now?
by digginfool
Wed Feb 07, 2018 4:46 pm
Forum: Automotive Power Only
Topic: Deja Vu All Over Again
Replies: 53
Views: 1652

Re: Deja Vu All Over Again

The fact that it is the same cylinder is very suspect. Maybe consider checking it with the plug removed from head see if the spark plug fires. If the plug is getting fire then it may be injector or fuel management as root cause. I thought about that too but not getting any codes for injector errors...

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