1970 Weiman

« **Reply #200 on:** June 22, 2015, 08:54:07 AM »

That is awesome let me know the next time you take it out hopefully I can get out there with you. And great job!!

"RTCP"

« **Reply #201 on:** June 22, 2015, 09:08:48 AM »

You should run the two engine dumps together with a T or Y into a single line, then T or Y from that for injection water. This way it will equalize pressure and flow through the engine.

Did you GPS it at all? I'm curious what a 5.3 will pull speed wise. I'm thinking 60-65 MPH.

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« **Reply #202 on:** June 22, 2015, 09:18:37 AM »

Quote from: capogniracing on June 22, 2015, 08:54:07 AM

That is awesome let me know the next time you take it out hopefully I can get out there with you. And great job!!

"RTCP"

thanks dennis, i really appreciate it! Ill let you know next trip out. As of right now the next trip is for the 4th of july to Mesa AZ for some friends

« **Reply #203 on:** June 22, 2015, 09:28:48 AM »

Quote from: philofab on June 22, 2015, 09:08:48 AM

You should run the two engine dumps together with a T or Y into a single line, then T or Y from that for injection water. This way it will equalize pressure and flow through the engine.

Did you GPS it at all? I'm curious what a 5.3 will pull speed wise. I'm thinking 60-65 MPH.

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I did not really GPS it, didnt want to beat on the new engine to hard yet.

But at 3000 RPM it is running right about 32mph according to GPS. I didnt realize that when my phone locks, it shuts off the GPS so i dont know what it runs past that. It felt strong though im guessing at the least 60 but based on what ive seen other 5.3's report and the fact i should be making a bit more power im hoping to see a solid 70. Another member here had a 16ft heavy schiada with a stock 5.3 and a jet it ran 72 if i remember correctly.

As far as the cooling goes, here is a very crude paint drawing of what i have going on. I run a line from the pump to a gate valve, the gate valve to a tee under the motor. then into the two cooling ports on the motor, then out the thermostat ports (two of them) then straight to the dumps. I added a tee in line to the driver side dump overboard.

Are you saying to tee the thermostat ports back to one, then tee off of that?

« **Reply #204 on:** June 22, 2015, 09:39:52 AM »

Yea, I doubt you need two dumps for the coolant. One 1/2 dump should be enough. If it creates too much pressure in the engine or can't cool well enough go to a single 5/8 or 3/4 dump. I'd put a temp pressure gauge on it to see what pressure you are getting in the engine. I like to see 10-15 psi at full throttle. As with anything else there are lots of ways to accomplish the same thing and YMMV.

On my little Omega I will be pulling the water from the steam ports with a small adjustable gate valve to regulate flow to supply the headers. The block returns will use a Y to combine and exit the boat with a single 1/2 dump.

« **Reply #205 on:** June 22, 2015, 09:41:42 AM »

Quote from: philofab on June 22, 2015, 09:39:52 AM

Yea, I doubt you need two dumps for the coolant. One 1/2 dump should be enough. If it creates too much pressure in the engine or can't cool well enough go to a single 5/8 or 3/4 dump. I'd put a temp pressure gauge on it to see what pressure you are getting in the engine. I like to see 10-15 psi at full throttle. As with anything else there are lots of ways to accomplish the same thing and YMMV.

On my little Omega I will be pulling the water from the steam ports with a small adjustable gate valve to regulate flow to supply the headers. The block returns will use a Y to combine and exit the boat with a single 1/2 dump.

I thought about pulling from the steam ports. But i dont think itll be enough volume to fill a 5/8 hose to a valve to the front.

So, Tee the two dumps to one, then tee them to one dump and one to the header valve?

« **Reply #206 on:** June 22, 2015, 09:43:31 AM »

Yup. That should fix your pressure issue to the header valve and also keep it from creating a pressure difference in the engine.

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« **Reply #207 on:** June 22, 2015, 09:45:50 AM »

Quote from: philofab on June 22, 2015, 09:43:31 AM

Yup. That should fix your pressure issue to the header valve and also keep it from creating a pressure difference in the engine.

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Cool, then i need one more tee and a way to block off the dump in the transom until i get a second bilge pump

« **Reply #208 on:** June 22, 2015, 09:55:52 AM »

+1 on second bilge pump. I want one manual and one automatic. Freaks me out this boat has a flat floor and I can't see if there is water.

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« **Reply #209 on:** June 22, 2015, 09:58:09 AM »

Quote from: philofab on June 22, 2015, 09:55:52 AM

+1 on second bilge pump. I want one manual and one automatic. Freaks me out this boat has a flat floor and I can't see if there is water.

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Yeah thats the plan... I current;y have one of the harbor freight 1000 GPH bilge pumps on a switch. Its a 1, 1/8 hose and is like a damn garden hose. Figure ill get a smaller rule one on a float thatll be automatic

« **Reply #210 on:** June 29, 2015, 08:09:03 AM »

Well, I think all of the big projects are done with this thing. Moving forward the plan is just get the trailer cleaned up, painted new bunks etc. and then of course, when funds allow build a 408

This weekend i broke down and put mufflers on it. For a few reasons. 1. Hopefully take some of the sharpness away. 2. so i can tell cops i have mufflers. 3. To extend the collectors past the transom so when i inject water it doesnt soak the inside of the back of the boat.

I only tack welded them in three spots, didnt feel like pulling the headers off

then yesterday i decided to pull the wheels and check the bearings out since we are planning to tow the boats to Phoenix for the 4th. Good thing I did because they were pretty much shot

I also got the alternator installed and wired up. Works great

Other than that, i installed the engine cover thingy, and cleaned the interior. Washed/Waxed it and i think im ready to go.

« **Reply #211 on:** June 29, 2015, 08:09:55 AM »

some more pics

« **Reply #212 on:** June 29, 2015, 07:47:12 PM »

I didn't realize they made a K5 pulley for GM alts.

« **Reply #213 on:** June 29, 2015, 07:48:01 PM »

Quote from: philofab on June 29, 2015, 07:47:12 PM

I didn't realize they made a K5 pulley for GM alts.

K5 pulley?

« **Reply #214 on:** June 29, 2015, 08:09:17 PM »

Oops. K5 = 5 Rib

I just call them that because thats how the part number works on the belt.

Most are K6, as far as I know all of the GM serpentine setups use 6 rib unless it's a diesel which use 8 rib.

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« **Reply #215 on:** June 29, 2015, 08:11:25 PM »

Quote from: philofab on June 29, 2015, 08:09:17 PM

Oops. K5 = 5 Rib

I just call them that because thats how the part number works on the belt.

Most are K6, as far as I know all of the GM serpentine setups use 6 rib unless it's a diesel which use 8 rib.

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Oh. Idk. Pulled the pulley off of an old alternator I had from a 1986 trans am.

« **Reply #216 on:** July 07, 2015, 01:25:17 PM »

well I took her out to Canyon Lake In Arizona for the fourth. Visited some friends.

Boat ran great all weekend. Was turn key reliable and a shit ton of fun.

I learned my cam is entirely to big for this little 5.3 (figured it was but its what i had) and i can only spin to 5000 rpm. The cam starts making power around 4500, but i hit that wall and the 5.3 just doesnt make enough power to swing any higher.

Im starting to look into cam options.

She pulled 65 on GPS with me, another grown man, 3 ice chests, some other shit for the day and two full tanks of fuel.

Im happy with that, i REALLY need a diverter/split bowl/droop. But for a more or less stock JC im more than impressed.

But for now, im just going to enjoy it for the summer. Maybe this winter ill look into another engine build. But i think with some fine tuning on the combo, i have 70. And thats not bad for a 325ci motor

« **Reply #217 on:** July 07, 2015, 02:01:35 PM »

There was a Car Craft years ago where they compared the stock LS1 cam vs the stock 5.3 and then an aftermarket cam. The LS1 did ok, but the aftermarket one they tested made almost 100 hp. A cam with similar specs would probably be just right for a jet boat. I'll see if I can find it.

I have a bunch of stock LS3 cams but I think they use a different trigger / cam gear.

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« **Reply #218 on:** July 07, 2015, 02:06:41 PM »

Quote from: philofab on July 07, 2015, 02:01:35 PM

There was a Car Craft years ago where they compared the stock LS1 cam vs the stock 5.3 and then an aftermarket cam. The LS1 did ok, but the aftermarket one they tested made almost 100 hp. A cam with similar specs would probably be just right for a jet boat. I'll see if I can find it.

I have a bunch of stock LS3 cams but I think they use a different trigger / cam gear.

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Chris,

i think i found that article. Im pretty sure my cam is good for ATLEAST 100hp over stock. But at 6500 RPM or so....

The article i found is here

http://www.hotrod.com/how-to/engine/1307-ls-cam-test-comparison/

based on that article, im considering something like the Crane Cam Trio 210 or 224

« **Reply #219 on:** July 07, 2015, 02:18:06 PM »

A little less power with a better curve will go a long way. Something that starts winding up at 3k or so.

What impeller do you have? B?

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« **Reply #220 on:** July 07, 2015, 03:07:28 PM »

Quote from: philofab on July 07, 2015, 02:18:06 PM

A little less power with a better curve will go a long way. Something that starts winding up at 3k or so.

What impeller do you have? B?

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I've got a BC. And thats what im thinking too.

Called a cam guy here in Glendora that ive used a few times. Told him what i have for an engine, and what im running right now for a cam. He said right away that it was way wrong and i should gain with a smaller cam.

He has a few grinds he recommends. And he said the same thingas you. all of his will start making power around the 2500-3k mark with my 5.3.

Now i need to find a core. He said if i can find a 5.7 LS1 core that would be best and we can do anything on it.

« **Reply #221 on:** July 07, 2015, 03:21:26 PM »

I have a brand new aluminum B impeller here if you want to give it a try and see how it does vs your BC cut after you get the cam swapped.

LS1 cores are plentiful on LS1tech.com.
That is where I pick up most of my parts. Some of the engine guys in your area may have some too, maybe Danzio or Redline.

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« **Reply #222 on:** July 07, 2015, 03:31:44 PM »

Quote from: philofab on July 07, 2015, 03:21:26 PM

I have a brand new aluminum B impeller here if you want to give it a try and see how it does vs your BC cut after you get the cam swapped.

LS1 cores are plentiful on LS1tech.com.
That is where I pick up most of my parts. Some of the engine guys in your area may have some too, maybe Danzio or Redline.

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I might give that a shot if you dont mind. But i think it might end up being to big and i wont get the RPM i need out of it. Though it would lower my cruising rpm (from the 3k it is now) I might hit you up on that

I called a few and they have some but they want around 100-150. The cam grinder wants 75 for a core. So if i dont find one ill use on of his

« **Reply #223 on:** September 08, 2015, 09:18:25 AM »

Never got around to changing out my cam. Its still sitting in the box. Ill get around to it sooner or later.

But i think all the bugs are worked out now. I have a slight porpoise at the top end that i need to iron out other wise i think the nightmare is over.

Took it out to Elsinore Sunday for a couple hours early. Boat ran very strong. Previously i had some fuel psi issues, but i bought an Aeromotive regulator to go with the new pump i bought, and everything seemed under control.

fuel pressure is stable at 6.5 pounds and the boat runs very clean. It did stall on me after hitting the rev limiter once and coming out of the water. I think it might have ingested some water from the scoop being backwards. My reverse bucket seems to throw a little bit of water over the transom.

but regardless with me, my GF, two full tanks, and a small ice chest I ran 69 on GPS at elsinore. Im pretty happy with that. I did the math and thats about 600 pounds of weight onboard.

Not bad at all for a little 5.3

Heres a picture my mom got of me doing a fly by in needles the weekend of the Avi, airs out pretty nicely.

And the gps screenshot from Elsinore Sunday

« **Reply #224 on:** September 08, 2015, 10:18:34 AM »

Quote from: steves86ta on September 08, 2015, 09:18:25 AM

Never got around to changing out my cam. Its still sitting in the box. Ill get around to it sooner or later.

But i think all the bugs are worked out now. I have a slight porpoise at the top end that i need to iron out other wise i think the nightmare is over.

Took it out to Elsinore Sunday for a couple hours early. Boat ran very strong. Previously i had some fuel psi issues, but i bought an Aeromotive regulator to go with the new pump i bought, and everything seemed under control.

fuel pressure is stable at 6.5 pounds and the boat runs very clean. It did stall on me after hitting the rev limiter once and coming out of the water. I think it might have ingested some water from the scoop being backwards. My reverse bucket seems to throw a little bit of water over the transom.

but regardless with me, my GF, two full tanks, and a small ice chest I ran 69 on GPS at elsinore. Im pretty happy with that. I did the math and thats about 600 pounds of weight onboard.

Not bad at all for a little 5.3

Heres a picture my mom got of me doing a fly by in needles the weekend of the Avi, airs out pretty nicely.

And the gps screenshot from Elsinore Sunday

Hell ya Steve cam change should put you good into the 70's! 👍👍

"RTCP"