SoCal Jet Boats
Tech Talk => Projects => Topic started by: JordanDangerfield on April 13, 2019, 10:10:11 AM
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I picked up a '75 Mandella flatbottom jet at the end of last year. It was last registered in '05. It sat covered, but water got in the boat and unfortunately the motor.
Lee (69Kona) is building the motor and pump for the boat. Hopefully he can chime in on the specifics of the motor build.
So far I've stripped the interior and most of the old rigging from the boat. The plan is:
Bring back the shine of the floors.
Replace the fiberglass tanks with aluminum or stainless.
Repair the interior wood since the material still in excellent shape.
Re-rig the boat as clean as possible.
The motor parts were polished at one point, but after sitting for fourteen years outside they were in sad shape. My focus on this project lately has been painting and polishing all the parts going back on the motor.
Next up is fiberglass work! One fuel tank is out. They laid these tanks up thicker than some boats I've seen!
The pics below are from the day I brought it home.
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Here are some pics of when it was in one piece. Anyone recognize where they are on the water? It's The Cove (formerly Riviera) in Blythe. I think it's pretty cool this boat was used on a stretch of river I frequent.
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The motor is .030 over .
Zero decked the block
Milled the G heads for smaller combustion chambers
I went to a 45* seat angle instead of the stock 30* on the valve seats and put the big valves and isky valve springs for the comp cam 292
Forged pistons 10:1 compression
Oiling mods
Balanced the rotating assembly
Motor will make some killer torque
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Neat boat. Looking forward to watching the progress

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Here's some before and after on the motor parts. Whatever I couldn't polish I painted.
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Cool looking boat. How do these ride?
Be careful when tightening those valve covers. I have the same ones and snapped that bolting flange real easy.
Looking forward to see how it turns out. 
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Cool looking boat. How do these ride?
Be careful when tightening those valve covers. I have the same ones and snapped that bolting flange real easy.
Looking forward to see how it turns out. 
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Thanks for the heads up. I'd be bummed after all the time I spent on them!
I've talked to a couple guys that owned a Mandella flat. They don't handle like a typical jet, but nothing weird. We shall see!!
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I pieced together a solid ignition system. I had the 6AL box left over from an old motor and found a good deal on the distributor.
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Progress.
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Progress.
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Did you do the polishing yourself? If so, great job.
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Did you do the polishing yourself? If so, great job.
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I did. Thank you!
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Looks awesome

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69Kona and I did some jet boat things today...
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Looks killer
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Engine is back in it!
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I saved a few pictures of hat boat to my phone when you first posted it up. I was just looking at it the other day wondering what happened to it. Glad to see it 🤟

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Love it
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So sexy
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I saved a few pictures of hat boat to my phone when you first posted it up. I was just looking at it the other day wondering what happened to it. Glad to see it 🤟
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So sexy
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Thank you!! It's been a longer than expected project and I almost sold it along the way, but it's how these things go.
I'm happy with how it's turning out. I can't wait to get it out on the water for a little winter run.
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Few more pics from last night.
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Making a bracket for the 6AL box.
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Making progress on the rigging.
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Details.
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Big difference from the original fiberglass tanks.
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Details on the tank mounts.
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Looking good my friend!
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Looking good my friend!
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Thanks John!
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About time to plumb and wire the ol' thing.
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Boats looking killer
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Love it. Going to look good when finished


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Thanks guys! I'm stoked to see it in almost one piece. Should be a running boat in a couple weeks.
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Making the most of my angle grinder and HF drill press. It ain't much, but it's honest work!
I decided I wanted the ignition box on the other side of the engine and also wanted to move the oil filter forward from its location on my original bracket. So, I remade them. Just need to polish them.
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Nice buddy!! You doing all this around the corner from me? I’m gonna have to go for a walk!!
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Nice buddy!! You doing all this around the corner from me? I’m gonna have to go for a walk!!
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The HOA put a stop to me working on the boat at home pretty quick. I got a spot at Daytona Storage in Perris. They're pretty cool about me working on the boats and the units have power.
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Wtf!!! What has California come to when can’t work on your own shit in you own house.
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Wtf!!! What has California come to when can’t work on your own shit in you own house.
That's an hoa for you.
But it works both ways.
I don't have to listen to somebody grinding away at something, either, if I'm in an hoa.
No, I don't live in an hoa.
Pick your battles.
Dan'l
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Wtf!!! What has California come to when can’t work on your own shit in you own house.
Unfortunately, that's where I live currently. No street parking either. Where I lived prior I had two projects sitting in front of the house for months and no one cared.
Ultimately, it's better that I got myself a little shop space. More room, everything is inside, and I can work on it any time of the day and night. The other day I was over there until 3:30am making noise.
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There's nothing like having your own shop
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Nice space Jordan!!
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Getting close!
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Damn that is coming out really nice. That’s actually a pretty bitchen little shop set up you have

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Here's a look at the fuel tank selector, fuel water separator, and remote oil filter mount.
I used two existing holes in the stringer to mount everything. I hate drilling additional holes in a boat so I made the most of the two already there. I'm happy with the setup. It's clean, accessible, and will make servicing the filters easy.
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Couple photos from the day I wired it.
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Getting close! Down to the finishing touches.
The interior still needs a little love, but at this angle it looks good.
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The Mandella is looking good!! Can we see a side view please.
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The Mandella is looking good!! Can we see a side view please.
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Thank you. I just took these couple close ups. I'm going to bring it by the house at some point. I'll swing by your place.
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Looking forward to that! I’ll have a Coors latte waiting for you!🤣
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Dialing in the details.
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I had to remove the engine to install the pump because it's such tight quarters. While the engine was out I put a different battery box in and loomed up the wiring with braided mesh sleeving. Now, the pump is installed and the engine is back in for the last time.
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Disclaimer: I didn't pull the engine with the plate attached to the intake.
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I still need to repair and paint the transom ring, but the nozzle is on and all the hardware is mocked up. I need a couple random bolts then I can bolt it all together for the last time.
It seems like the little details always take the longest.
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I want to acknowledge a few people that had a hand in this project.
Lee (69Kona) was the first to get involved. He built a badass engine and pump combo that should get this old hull moving!
Wes (Carrera202) worked his magic on the paint and brought the metal flake back to life. This boat had been getting beat up living on a side yard since '05. Also, thanks for the wiring tools that have made life MUCH easier.
Keith (Crewchief) rebuilt the carb. Rebuild is an understatement because it was GROSS inside. Now, it's sanitary and dialed in for the engine combo.
Joe (Flusher) I appreciate you coming by and scoping out the project!
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I want to acknowledge a few people that had a hand in this project.
Lee (69Kona) was the first to get involved. He built a badass engine and pump combo that should get this old hull moving!
Wes (Carrera202XR) worked his magic on the paint and brought the metal flake back to life. This boat had been getting beat up living on a side yard since '05. Also, thanks for the wiring tools that have made life MUCH easier.
Keith (Crewchief) rebuilt the carb. Rebuild is an understatement because it was GROSS inside. Now, it's sanitary and dialed in for the engine combo.
Joe (Flusher) I appreciate you coming by and scoping out the project!
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Thanks for having me buddy! We need to get together soon now that im back up and runnin!
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Looks very nice i like the style.....are you going to make it to the season kick off event?
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Great job
! The boat looks so cool. That metal flake cleaned up nice.
The little details are the killer. Especially when stuff goes together in order and you forget something and have to take everything back off again. 🤬 
Great write up as well. I always enjoy your project threads.
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Love that boat. Looks amazing. Cant wait to see it in the water. Gonna look killer
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I appreciate the kind words!!
Life has been hectic lately so if I make it to the opener it'll be a last minute decision.
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I scored a set of twisties. I feel like they fit the boat much better than the standard Bassetts. I stopped by to drop them off, but HAD to see what they looked like on the engine. Then, I took like eighty pictures. Here's a few...
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Looks killer
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I like the Twisties better. They look faster
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I think I read somewhere they flow a bit better and give a little bump in HP over the regular headers.
Are they closer to the gunnels than the other set?
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I like the Twisties better. They look faster
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I think I read somewhere they flow a bit better and give a little bump in HP over the regular headers.
Are they closer to the gunnels than the other set?
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They're close, but not too bad.
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Finally dug into the interior.
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Need more interior pics from Bradley Bear Customs!
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Need more interior pics from Bradley Bear Customs!
I'll eventually get a build thread going for the Hallett.
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Here's some of Brad's handy work.
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You breaking that motor in yet!! Time to get it wet!
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Snagged a couple pics in the sun. I need to hurry up and finish the interior so I can get on the water!
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Looks great. What color interior are you going to go with?
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I can't wait to see it finished!!! Lots of work about to pay off!
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Absolutely love that boat.
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Only 15 more days till the river trip, you got this!!!
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Looks great. What color interior are you going to go with?
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I'm using the original vinyl. It's still in great shape surprisingly. The new seat base is just about finished.
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Let me know when I have some silver bullets for the occasion
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Finally finished up Pumpkin Spice and got her on the water for a shakedown run! Not a single issue or leak. 69Kona built one hell of an engine!
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That boat looks amazing! I love that you kept the original colors. The orange flake turned out great. I had to replace my gel and most of the flake. Talk about a nasty job... Hope you get lots of enjoyment out of your toy.
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Absolutely gorgeous. Fuckin love it. Great job



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Took Pumpkin Spice to Havasu.
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Awesome! Beautiful boat, Great job.
I am currently having Martinez marine reupholster my interior, and he is making me a Bimini top also, as does not have one yet, how tall is your top from the floor?
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My float just got “released from the paint booth today and will be heading to Martinez marine next week
JAG Motorsports
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My float just got “released from the paint booth today and will be heading to Martinez marine next week
JAG Motorsports
Beautiful boat more pics please. Martinez marine did the upholstery for my Rogers and it turned out great! Would recommend them to anybody in so cal
Matt 85 TR
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I had a’73. It will spin with little or no warning but a fun boat once you learn to drive it
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