Search found 849 matches

by CarMotorBarge
Mon May 20, 2019 7:06 am
Forum: Prop Talk
Topic: Prop VS Motor: Airgator, LS2 6.0, Sensenich NEED ADVICE
Replies: 30
Views: 839

Re: Prop VS Motor: Airgator, LS2 6.0, Sensenich NEED ADVICE

I would also clean out the brand new tank after you get it. I have seen several brand new tanks with enough metal shavings in them to clog the filter. This happens more than people realize.
by CarMotorBarge
Fri May 17, 2019 5:45 am
Forum: Automotive Power Only
Topic: LOW TORQUE LS Engine Build
Replies: 27
Views: 994

Re: LOW TORQUE LS Engine Build

Yes, I was never planning to do a DD. Plan to run a 2.88 ratio with this motor and spin it.
by CarMotorBarge
Thu May 16, 2019 9:22 pm
Forum: Automotive Power Only
Topic: LOW TORQUE LS Engine Build
Replies: 27
Views: 994

Re: LOW TORQUE LS Engine Build

Here is the latest on the low torque LS build. Decided to use the following cylinder heads: https://www.texas-speed.com/p-7650-precision-race-components-aftermarket-ls3-as-cast-cylinder-heads.aspx Planning to get the stainless hollow stem intake valves with 0.660 dual springs. The intake runner is 2...
by CarMotorBarge
Tue May 14, 2019 2:19 pm
Forum: Airboat Talk
Topic: LS DD maiden voyage
Replies: 305
Views: 18200

Re: LS DD maiden voyage

Was that 427 LS on the dyno an LS3 or LS7?
by CarMotorBarge
Tue May 14, 2019 2:10 pm
Forum: Prop Talk
Topic: Prop VS Motor: Airgator, LS2 6.0, Sensenich NEED ADVICE
Replies: 30
Views: 839

Re: Prop VS Motor: Airgator, LS2 6.0, Sensenich NEED ADVICE

It is also a good idea to install a wideband O2 sensor so that you can keep an eye on the AFR while you are driving.
by CarMotorBarge
Tue May 14, 2019 6:49 am
Forum: Automotive Power Only
Topic: LOW TORQUE LS Engine Build
Replies: 27
Views: 994

Re: LS LOW TORQUE Engine Build

Challenge heard and accepted, Game ON! We still need to negotiate the terms and the win/lose/draw basis, but I am in. Real busy with work this week, so I will just have to let this all fester until later. I will post my counter challenge later this week and we can all pick sides and start trash tal...
by CarMotorBarge
Tue May 14, 2019 6:43 am
Forum: Automotive Power Only
Topic: LOW TORQUE LS Engine Build
Replies: 27
Views: 994

Re: LS LOW TORQUE Engine Build

Msa4x4 wrote:Get you a ls3 block and throw a 4.8 crank in it. Should get you 8k rpm easy


I have a 5.3 cast iron block and a stock crank with a 3.622 inch stroke. Was thinking about doing a 5.3 build that spun to 7000 RPMs for an airboat build. Need to build and test the current build first. 8)
by CarMotorBarge
Tue May 14, 2019 6:41 am
Forum: Automotive Power Only
Topic: LOW TORQUE LS Engine Build
Replies: 27
Views: 994

Re: LS LOW TORQUE Engine Build

Thanks Kwan.
by CarMotorBarge
Mon May 13, 2019 9:29 pm
Forum: Automotive Power Only
Topic: LOW TORQUE LS Engine Build
Replies: 27
Views: 994

Re: LS LOW TORQUE Engine Build

Kwan,

I need some Jedi wisdom to get the pictures to show the full size. 8) Can't see the entire part number on the LS2 block.
by CarMotorBarge
Mon May 13, 2019 9:25 pm
Forum: Automotive Power Only
Topic: LOW TORQUE LS Engine Build
Replies: 27
Views: 994

Re: LS LOW TORQUE Engine Build

Here is the LS2 block for the build on the engine stand: https://southernairboat.com/wp/wp-content/uploads/rtMedia/users/171/2019/05/0505191822-800x450.jpg The P/N is 12568952: https://southernairboat.com/wp/wp-content/uploads/rtMedia/users/171/2019/05/0513192032-800x450.jpg The LS2 block is an alum...
by CarMotorBarge
Mon May 13, 2019 6:56 pm
Forum: Automotive Power Only
Topic: LOW TORQUE LS Engine Build
Replies: 27
Views: 994

Re: LS LOW TORQUE Engine Build

All testing will be real world testing. No graphs, formulas, torque curves, or book theory. Just real world testing of a LOW TORQUE LS engine on an AIRBOAT Finally a real airboater's airboater, a harbinger with olive branch extended, the first fully transparent disclosure build, minimizing the CM &...
by CarMotorBarge
Mon May 13, 2019 6:50 pm
Forum: Automotive Power Only
Topic: LOW TORQUE LS Engine Build
Replies: 27
Views: 994

Re: LS LOW TORQUE Engine Build

Got another update on the build. I have decided to use a 4 inch stroke. Hopefully I don't throw a rod thru the oil pan when turning 7000 RPMs. Now I need to figure out which pistons and heads.
by CarMotorBarge
Mon May 13, 2019 6:48 pm
Forum: Automotive Power Only
Topic: LOW TORQUE LS Engine Build
Replies: 27
Views: 994

Re: LS LOW TORQUE Engine Build

SWAMPHUNTER45 wrote:Kneel at the throne of POWER !

Let me fan you with my 4 "SUPERWIDE" blades as you rest your weary engine.


I think I need an additional goal for this build. Turn 4 S blades pitched at 1 to 1900 prop RPMs.

Swamphunter45, can I borrow you prop for this test?
by CarMotorBarge
Mon May 13, 2019 6:41 pm
Forum: Prop Talk
Topic: Prop VS Motor: Airgator, LS2 6.0, Sensenich NEED ADVICE
Replies: 30
Views: 839

Re: Prop VS Motor: Airgator, LS2 6.0, Sensenich NEED ADVICE

Also not a bad idea to pull the plugs and look at them. Might give you some info to solve the problem.
by CarMotorBarge
Sun May 12, 2019 10:07 am
Forum: Automotive Power Only
Topic: LOW TORQUE LS Engine Build
Replies: 27
Views: 994

Re: LS LOW TORQUE Engine Build

JB550 wrote:You are a mess. LOL


I probably am a mess for building a high RPM LOW TORQUE motor for an airboat. Remember it is all about TORQUE. :stirpot: I am just hoping I don't have to cruise around at 4500 to 5000 RPMs sucking tons of gas.
by CarMotorBarge
Sun May 12, 2019 10:01 am
Forum: Automotive Power Only
Topic: LOW TORQUE LS Engine Build
Replies: 27
Views: 994

Re: LS LOW TORQUE Engine Build

Here is an update. I think I found a used LS2 block for $500. It is a stock 6.0 aluminum block. Now I need to determine what length stroke I am going to use keeping in mind that max HSP will be at 7000 RPMs.
by CarMotorBarge
Sat May 11, 2019 8:42 pm
Forum: Automotive Power Only
Topic: LOW TORQUE LS Engine Build
Replies: 27
Views: 994

LOW TORQUE LS Engine Build

Well I have decided to build a LOW TORQUE LS engine to put on my airboat. As with any engine build, you have to have goals. Here are my goals: 1. Make maximum HSP at 7000 RPMs. This engine will have no low end torque. I expect that a 540 A/C will make more maximum TORQUE than this LS engine. :shock:...
by CarMotorBarge
Sat May 11, 2019 7:57 pm
Forum: Airboat Talk
Topic: Fun With Numbers
Replies: 5
Views: 453

Re: Fun With Numbers

The answer is the thrust curve doesn't closely follow either the torque or HSP curves. When the thrust curve is graphed based on prop RPM and thrust, it looks like an exponential curve. Neither the torque curve or the HSP curve look like that.
by CarMotorBarge
Thu May 09, 2019 9:08 pm
Forum: Automotive Power Only
Topic: Cadillac 500 turbo charging???
Replies: 16
Views: 1350

Re: Cadillac 500 turbo charging???

You have to seek RPM to make HSP and more HSP is how you turn more prop. :stirpot: :stirpot: :stirpot: :stirpot: :stirpot:
by CarMotorBarge
Thu May 09, 2019 8:54 pm
Forum: Airboat Talk
Topic: RIP Ruagatr
Replies: 17
Views: 875

Re: RIP Ruagatr

Sorry to hear this. He was a great guy.
by CarMotorBarge
Wed May 01, 2019 5:45 am
Forum: Automotive Power Only
Topic: Air fuel ratio for direct drive
Replies: 86
Views: 2447

Re: Air fuel ratio for direct drive

Reading through this thread has been interesting. There is a lot of old tech and info about EFI in here. worry about computers overheating, not being waterproof, failing components. Like we all forgot that we daily drive on efi in our cars for the last 30 years..Standalone computers arent much diff...
by CarMotorBarge
Tue Apr 30, 2019 1:23 pm
Forum: Automotive Power Only
Topic: Air fuel ratio for direct drive
Replies: 86
Views: 2447

Re: Air fuel ratio for direct drive

LOL. Airboaters are really slow to embrace new technology. You still have people running 70 year old A/C motors wondering why they are always getting stuck and having to shake rakes to get out.
by CarMotorBarge
Mon Apr 29, 2019 9:24 pm
Forum: Automotive Power Only
Topic: Air fuel ratio for direct drive
Replies: 86
Views: 2447

Re: Air fuel ratio for direct drive

new to airboats but not tuning engines. I have one serious question for you guys. Why are people disregarding the O2 sensor in favor of the plug read method? If I chose to read plugs vs WB o2, my turbo engines might not make it past the first boosted run. Not to mention making the whole tuning proc...
by CarMotorBarge
Thu Apr 18, 2019 5:17 am
Forum: Airboat Talk
Topic: New ej20 subaru turbo 2:1 belt drive 10 blade
Replies: 13
Views: 449

Re: New ej20 subaru turbo 2:1 belt drive 10 blade

That is what it is all about. 8)
by CarMotorBarge
Mon Apr 15, 2019 6:46 am
Forum: Automotive Power Only
Topic: reduction and prop help on 650 hp
Replies: 5
Views: 504

Re: reduction and prop help on 650 hp

I would run the motor 5600 RPMs at WOT with a 2.68 turning either a 4 blade JR or 3 blade JX. A properly built LS is very dependable with WOT at 5600. The 4 blade JR will give you a little more push because of more blade area. You might have enough HSP for a 4 blade JX. Call Sensenich to find out. Y...

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