AngrySailor’s random machining, motors, fix it or (explitive) it thread

[AngrySailor]

Was 75% done blasting then it rained for ten friggin mins yesterday🤬  put some bump stops on and brackets to hold the tail light wiring. Going to run small pvc conduit down each side. 

[Alan Dinan]

That sucks about the rain, but it is looking good 

[jeeper61]

Here's a little Detroit for hump day

 

[AngrySailor]

1 hour ago, jeeper61 said:

Here's a little Detroit for hump day

 

NICE! I worked on a ship with two 12v149’s running generators. They were awesome under load. Two blowers, quad turbos. 

[AngrySailor]

Finally got a coat of urethane paint on it. 

[Rawleigh99]

Looks like new!

[AngrySailor]

Almost done. 

[Alan Dinan]

Looks brand spankin’!!!

[AngrySailor]

Working on the wiring rn and put some side bunks on the inside of the fenders. I’ve got a ‘52 8N Ford that we haven’t run in a while parked in front of the barn door with the boat inside rn. I cleaned the points yesterday and she fired up, the engine is whipped but always had good oil pressure. She had zero… pulled an oil line off the pressure port in the block and nothing, there’s oil in the sump so something went for a crap… 

[AngrySailor]

Trailer done, wired, marker lights, center marker, even a license plate light. Ran a ground wire down each side so no lights use the trailer chassis as ground. Ran the wires inside PVC conduit and grommeted everywhere they pass through the frame.

[jeeper61]

Finally found the time to put the front diff back together and back in my Trailblazer took it for spin all seems well.

The SS has mechanical AWD with Torsen diff in the transfer case so no front diff no go.

LS2 with a Magnuson 112 

 

 

[AngrySailor]

Working on the blower again finally. Got the rotor timing real close, had to cut 0.009” off the shoulder of the non drive rotors gear, working on the teflon retaining screws now. Once the new Teflon is in and held I’ll double check the timing and should be ready for assembly. 

[Gearclash]

On 8/3/2025 at 6:17 PM, AngrySailor said:

Trailer done, wired, marker lights, center marker, even a license plate light. Ran a ground wire down each side so no lights use the trailer chassis as ground. Ran the wires inside PVC conduit and grommeted everywhere they pass through the frame.

I did something similar (dedicated ground wire) on my 20' goose neck when I built it.  One problem though.  I used 14 gauge wire for the ground, and I found when I stepped on the brakes (and sent current to the trailer brakes) that the ground wire got overloaded and made the LED marker lights go out.  I had to chassis ground the brakes and and use a heavier ground wire in the whip for the plug and chassis ground that also.  

Interesting setup  on the mill!

A while back I asked if the blowers on Detroit 2 strokes had teflon seals.  The answer was no.  I got to thinking I suppose they really aren't needed there as the pressure increase across the blower is not very much compared to a performance application where intake pressure is considerably above atmospheric. 

[AngrySailor]

Yes, the brake ground must be capable of handling all the brake supply wires… no brakes on the boat trailer thankfully. Brakes and water don’t mix let alone salt water… that’s right about the Detroit blowers. They don’t really build much air box pressure, they’re technically a “scavenge blower”. Detroit blowers can be converted to automotive applications with no strips and they make aftermarket blowers with no strips like my BDS 8-71 stage II. Strips are really only needed for big boost builds. I wish the 14-71 didn’t have strips, they’re not required for the boost I want but the blower won’t work without them due to the grooves for them machined into the rotors.  
 

All the retaining screws drilled and tapped now. Restrip the rotors tomorrow and it’s ready to assemble, final check/adjustment on rotor timing and it’s a blower. That did take a little messing around to get set up. Was able to one rotor in one set up, angle the head to the helix, drill and tap each end then flip the rotor and do each end again for 12 holes, then angle the head opposite and do the same for the other rotor. 

[jeeper61]

https://www.facebook.com/watch?v=1087689266665112

[Gearclash]

8,000 rpm valve train in an 8V-92 — now stop for a moment and consider that the valve train in that engine, at 8K, is moving as fast as the valve train in a 4 stroke that is howling at 16,000 rpm. That’s pneumatic valve spring territory. 

[hardtail]

Only need to worry about exhaust valves though, 1/2 the hardware

[AngrySailor]

The exhaust valves are also opening and closing while the piston is down the cylinder (when the intake ports are uncovered), not trying to pull away from a rising piston like a 4 stroke. On the 598 the piston and exhaust valve get to within 0.110” of each other before the valve begins closing faster than the piston is rising. Still 8K on a two stroke Detroit is wild, effectively the same valve train speed as 16k on a 4 stroke! I bet the cam profile isn’t as aggressive as far as ramp rates and lift as a four stroke capable of that rpm which will reduce the spring load required also the Detroit valves are pretty small/light weight so that helps as well. I’d be worried about the valve bridges bouncing out of place if they float though. That’s what failed on the 12v149 that ran away on one ship I worked on. 

[jeeper61]

Its got 8K rated valve train

Likely some 4 stroke racing stuff 

They aren't spinning it that fast or the whole bottom end would need some attention too  

[jeeper61]

What am I seeing here?

https://www.facebook.com/reel/10027552220666694

[AngrySailor]

22 minutes ago, jeeper61 said:

Its got 8K rated valve train

Likely some 4 stroke racing stuff 

They aren't spinning it that fast or the whole bottom end would need some attention too  

Yeah I don’t think them heavy azz Detroit pistons will take that kind of rpm! 

[jeeper61]

2 hours ago, AngrySailor said:

Yeah I don’t think them heavy azz Detroit pistons will take that kind of rpm! 

Just imagine the rods needed for 8k with the stock pistons 

[AngrySailor]

25 minutes ago, jeeper61 said:

Just imagine the rods needed for 8k with the stock pistons 

Gotta keep in mind that theoretically the rod should never be under tension like in a four stroke… unless there’s a misfire….

[AngrySailor]

Ready for assembly and final timing check. 

[AngrySailor]

Holy fork it’s together guys! Turns nice, think it’s a blower again.