SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: speedymopars on March 02, 2008, 11:01:48 PM
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OK, minor flow in my plan. I bought some glenwoods from and rear mounts - they are 26 inches wide, which corresponds to my stinger width (in to in measurement).
I got it lined up, then realized that the entire engine, all 4 mounts, was only going to be supported by bolts going into the stringers at 90 degrees with nothing on top of the stringer to take the force of bouncing etc. My 455's mounts had it at 90 degrees AND over the top of the stringers.
My question is, how critical is that. I am thinking it is pretty essential, and throwing a couple of lag / wood / etc screws, even at 1/2 diameter, isn't going to be enough. I'd love to hear thoughts - I am stalled at this point.
Thanks!
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Hey Speedy,
I'll take a couple of photos tomorrow and post them but what I did was take some 4" x 1/4" aluminum plate, 36" long and ran then on the outside of my stringers and let it rest on the hull. Then I lined everything up motor mount wise and in position then with all the mounts attached to the motor, I marked the places on the inside of the stringers (wooden part) and then clamped the aluminum in place and drilled through stringers and plate. Dropped the motor back into place and ran the bolts through and tightened everything down.
Greg
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Speedy,
Here is what I did when I put my BBc in my Nordic. I made plates and welded half pipe on top (half pipe is kind of just for looks.) The feet on the other side as well.
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fwww.tjsperformance.com%2Fimages%2Fnordic51.jpg&hash=31430d656973c9aafe2018575f7c1d5ac2b83177)
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fwww.tjsperformance.com%2Fimages%2Fnordic52.jpg&hash=491388375c2d4d10d62049148efabc770d9cc0f8)
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Speedy,
Here is what I did when I put my BBc in my Nordic. I made plates and welded half pipe on top (half pipe is kind of just for looks.) The feet on the other side as well.
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fwww.tjsperformance.com%2Fimages%2Fnordic51.jpg&hash=31430d656973c9aafe2018575f7c1d5ac2b83177)
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fwww.tjsperformance.com%2Fimages%2Fnordic52.jpg&hash=491388375c2d4d10d62049148efabc770d9cc0f8)
Nice job. I'll have to remember this when I take everything apart to fix some bad glass work that was done prior to me getting the boat and then painting. Greg
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That does look nice. So if the top part is just for looks, my assertion that something needed to sit on top of the stringers was wrong, wasn't it...
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Normaly the bolts just go through the stringers with nuts on the backside, don't use bolts threaded for wood.
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That does look nice. So if the top part is just for looks, my assertion that something needed to sit on top of the stringers was wrong, wasn't it...
I am not sure on that Speedy. I just put them on there to act as a big washer. The large feet on the other side as well as the plate are pinching the stringer. I imagine this is better than how the factory did it with just washers on the outside. The next move would be a rail kit I guess. IMHO I feel this is strong.
T.J.
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What I did to support my engine until I do the hull work.
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fhome.comcast.net%2F%7Egregaw%2FStringer_Support_vsm.jpg&hash=feb727ece3b7072307c12ecc0a21981570207ece)
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TJ you did an excellent job on that. I'm really impressed with your weld's I am but a novice welder and I can appreciate how hard it is to weld aluminum (or any metal) as clean as this fine example. You guys have got to see Ralph's boat, he really did a job stiffening that sucker up with aluminum. He essentially laddered his stringers with some well placed aluminum plates.
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thanks Undone. I originally had full plates on each side. See pic., but when mounting the hardin marine mounts up I really did not have the room on the inside of the stringer so I cut that plate off. See pic. ok Ralph, let's see the pics of what you have.
T.J.
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fwww.tjsperformance.com%2Fimages%2Fstringer_plates06.jpg&hash=856d5a03c92bb6ca1a0155b78735814d8bf187ff)
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Got the engine mounted today. All day project, that's for sure.
I went ahead and used 3/16 aluminum angle iron with grade 8 bolts, fender washers and nylocks to mount to my stringers. Hopefully it ends up being OK.
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...Still to come tonight / tomorrow- New (to me) Nickson snails to be mounted along with some 4 inch exhaust tips with Salsberrys. I shouldn't have any water issues with that set up...
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3/8 motor plate and 1/4 angle
(https://www.socaljetboats.com/cpg/albums/userpics/10041/flyweel_instal_009.jpg)
(https://www.socaljetboats.com/cpg/albums/userpics/10041/flyweel_instal_008.jpg)
(https://www.socaljetboats.com/cpg/albums/userpics/10041/flyweel_instal_007.jpg)
(https://www.socaljetboats.com/cpg/albums/userpics/10041/flyweel_instal_006.jpg)
this is in my liberty i'll see if i can find some pix of the hornet, but its basically the same
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the hornet
(https://www.socaljetboats.com/cpg/albums/userpics/10041/DSC03874.JPG)
(https://www.socaljetboats.com/cpg/albums/userpics/10041/DSC03877.JPG)
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THAT'S what I was talking about when I said Ralph is serious about his aluminum. Personally I think they did a pretty good job strengthening her up and kept it professional looking at the same time. Not bad for some "backyard hacks." Keep up the good work.
BTW if anyone requires material (steel or aluminum plate) let me know dimensions and I'll take a stroll through our scrap yard. Prices on the material is based on the contractual scrap price our company has with the major smelters of the southland. typically around $.65-$1.70 per pound. We have tons of 7075 T5 aluminum and thousands of tons of steel. I can keep an eye out for other aluminum alloys, we have A LOT of lithium-aluminum used to make the big orange fuel tank on the space shuttle. We make that tank. Not the foam, just the tank...
Totally off subject here.........
We also have 2 M60A3 tank engines- Continental AVDS-1790-2C 865 hp V-12 engines and Allison CD-850-6/6A powershift crossdrive transmissions. 865BHP @1800rpms 2600lb/ft @1700 out of 24.7 litres-quad turbos. Weighing in at 8000 lbs. Come get 'em we don't even want money for them. They still run, we were gonna use them as generators.
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Totally off subject here.........
We also have 2 M60A3 tank engines- Continental AVDS-1790-2C 865 hp V-12 engines and Allison CD-850-6/6A powershift crossdrive transmissions. 865BHP @1800rpms 2600lb/ft @1700 out of 24.7 litres-quad turbos. Weighing in at 8000 lbs. Come get 'em we don't even want money for them. They still run, we were gonna use them as generators.
Gee, if I could find about a 47 foot cat to drop those into, it would be perfect :-)
Now, seriously, that would take an a4 impeller, right :-)
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Gee, if I could find about a 47 foot cat to drop those into, it would be perfect :-)
Now, seriously, that would take an a4 impeller, right :-)
Damn and I was thinking it would need a A9 cut :banghead: ;D 8,000 POUNDS? :sly:
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Yes 8000 with transmission and all 30 quarts of oil... The Allison Tranny actually looks like a backpack. It's cool. I'll look for the pictures I took of them a few months back.