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FLexpat 07-06-2021 09:13 PM

I love it but don't go too crazy on that build!!!
I think the straight back Bravo 3 is limited to about 450 ft-lbs torque unless you do some upgrades. Another thing to watch is how deep you mount it - I know you can get drive extensions (0.5"-3") but I don't think you can get a shorty lower for the Bravo 3.
This might be useful: https://www.go-fast.com/Mercury-Merc...uction-Changes

Xcomunic8d 07-06-2021 11:22 PM

Thanks Iíll look into that. Most of that parts list is the heavy duty parts to handle prolonged higher rpm than car engines experience (main bearings, connecting rod bearings, heavy duty bolts, etc). Iím trying to make a how-to as there arenít many out there and I want a simple list for the next guy who wants to do this.

The dealer was kind enough to tell me mercís suggested mounting point of 13 9/16Ē up the framing sq from keel of boat. Thatís the center point for the template to cut out drive hole. Iíll need to mark that and compare the centerline of flywheel and the A/V plate on foot to keel. Iíll measure it out and let you guys know how itís going.

I was told 600hp was max. I was worried I wouldnít have enough torque but my bravo3 has a 2.0 (we think) gear ratio. Weíll know more once we tear it apart, inspect and reseal it. Itís the older style without the swept back design. My local dealer told me itís gonna max out around 55-60mph depending on rpm and be an absolute torque monster with dual prop and 20p blades.

The cam Iím planning on running is a tsp212/218. 437hp @6200 rpm, 418tq @ 4800rpm. I plan to high speed troll 13-20mph most of the time. Other than slightly ported heads, and maybe a bigger TB, there are no other power adders.

Iíll be mating it up to the 454 coupling on flywheel to help mitigate the chance of shearing the coupler apart. Those things are pricey.

I think I finally solved the raw water pump mounting issue to the crankshaft. Hopefully Iíll get through to guy I need to speak with tomorrow.

Xcomunic8d 07-17-2021 01:16 AM

So parts are coming in left right and center. I haven’t taken pics of each one b/c how exciting are piston rings and main bearings? I figured you see them installed.

https://i.postimg.cc/tZ2Sf38G/4809AA...C14CDB82E2.jpg

https://i.postimg.cc/30NSHyH4/35740F...FFABA4CFB9.jpg

Here’s more hand valve lapping.

https://i.postimg.cc/LYHQNCCV/7D8CDD...0DB79808C8.jpg

Using your water pump bolts can be very helpful to install the cam. Also it’s useful to reach around behind to guid it in for the last 2 cam bearings.

https://i.postimg.cc/hhhsnDP9/086D06...49604E8872.jpg

Here’s my 12yo son putting in his first batch of lifters.

https://i.postimg.cc/Cz3mJ30b/0C1C78...60144493E8.jpg

https://i.postimg.cc/wy4kNPFy/357911...67D98221DC.jpg

https://i.postimg.cc/D4WPPgYC/1D66C2...85D325A636.jpg

So the exhaust manifolds come in Monday. The majority of raw water system comes in tonight at some point.

I ended up ordering the exhaust manifolds from Hardin marine b/c they ended up being cheaper. The marine engine depot guy told me I had to pay more for O2 sensor bungs and it was not in a kit. I did however get most of the raw water system there.

Xcomunic8d 07-24-2021 10:03 PM

So I caught a mistake when I was reviewing my project. And trying to order a Holley terminator x. The timing set I ordered is compatible for a 1x sensor not a 4x sensor.

i 2 day aired a different cam sprocket in. It was a BTR.

Wrong sprocket for my gen4, 58x reluctor 4x cam sensor:

https://i.postimg.cc/wy4kNPFy/357911...67D98221DC.jpg

right sprocket

https://i.postimg.cc/ygZcZRCz/74B23B...CACABD3DE8.jpg

I tried to break my collarbone yesterday so my son is installing the second head under dads close supervision. I was helping some older friends pack and move off island. I had just repaired the bumper on their avalanche. I was up to my elbows in grease and filth due to rain and conditions. I went out back fo wash off. I went one way and mud went the other. My shoulder landed squarely on a lava rock. Boy that hurt.

https://i.postimg.cc/4KMpy5M5/4C7877...F9E4681E79.jpg


torquing rocker arms

https://i.postimg.cc/V0PMBNz0/CCCFC9...49729D1291.jpg


https://i.postimg.cc/dh52Pvjg/5A9230...290B519A31.jpg

https://i.postimg.cc/WDtMsK9z/04BCB1...3B05CB26E7.jpg


the exhaust manifolds are here and look awesome. That’s a follow-up post shortly with more research I did and info that will help the next guy.

Xcomunic8d 07-31-2021 07:48 AM

So itís kind of bad news, good news, bad news.

bad news #1. Canít find a Holley terminatorX 550-905 or 905t anywhere. If anyone can make a suggestion on where to find one or a different tunable system that has a harness, O2 sensors, and supports MPFI. Otherwise, Iíll be waiting until mid-late August (hopefully).

good news, as I was thinking through how the elbows and risers work along with closed cooling it occurred to me that water might be flowing over O2 sensors. That would be catastrophic. I didnít want to change these out regularly. I see no worries fir that.

https://i.postimg.cc/cv8nMq0g/2E6A85...830600A139.jpg

you can see the O2 bungs here.
https://i.postimg.cc/ZCn3nBQL/DABA2D...1EF376F75B.jpg

water inlet passage:
https://i.postimg.cc/CBv5pJwp/02D4A5...3E3BE16EEE.jpg

exit:
https://i.postimg.cc/QKHt85M9/D5DBDD...6F52E10E2E.jpg
i do have the parts to install a crank mounted raw water pump. Itís kind of cool when you think up an idea to have a machine shop build and then a little discouraging to find itís already made. But I suppose that is reinforcement you are on the right track. Iíll post those pics and parts when the whole system is here.

Bad news #2- this is kind of painful

the bravo 3 outdrive I purchased needs a full rebuild. Gear set, cone clutch, shims, seals, bearings, everything- but case, props and shafts are done.
Iíve really considered going alpha route but Iím too far in to turn back now and Bravo is clearly better suited for my application.

I was told itís pushimg $7k for that job before I buy the gimbal housing another 3k. I got the parts list and found a way to trim some costs down. I expect it will be 4.5k-6k. And then the gimbal housing at 3k. A new alpha is under 3k for whole thing and while that appeals to my wallet. I donít think that is a wise long term choice. But oh this one hurts, ouch really badÖ

we decided to go with 1.81 gear ratio. Originally it was a 2.0 gear ratio. We considered a 1.65 but weíre concerned somethings gonna give as that was not designed for these shafts as well as the load on the engine. Given itís primary role of fishing we decided to play it safe. I have the parts lists if anybody wants them. Partsvu.com says itís $3k out the door.

FLexpat 07-31-2021 11:12 AM

Quote:

Originally Posted by Xcomunic8d (Post 272315)
Bad news #2- this is kind of painful

the bravo 3 outdrive I purchased needs a full rebuild. Gear set, cone clutch, shims, seals, bearings, everything- but case, props and shafts are done.
Iíve really considered going alpha route but Iím too far in to turn back now and Bravo is clearly better suited for my application.

I was told itís pushimg $7k for that job before I buy the gimbal housing another 3k. I got the parts list and found a way to trim some costs down. I expect it will be 4.5k-6k. And then the gimbal housing at 3k. A new alpha is under 3k for whole thing and while that appeals to my wallet. I donít think that is a wise long term choice. But oh this one hurts, ouch really badÖ

we decided to go with 1.81 gear ratio. Originally it was a 2.0 gear ratio. We considered a 1.65 but weíre concerned somethings gonna give as that was not designed for these shafts as well as the load on the engine. Given itís primary role of fishing we decided to play it safe. I have the parts lists if anybody wants them. Partsvu.com says itís $3k out the door.

Smart move in avoiding Alpha - While it is a good drive up to ~300HP, your motor would destroy it pretty quickly. You might check out the swap shop on OffShoreOnly - I have seen decent looking Bravos there periodically. Think Bravo X if you go that route.

Xcomunic8d 08-20-2021 03:51 AM

I have given up on getting a terminator x from Holley. They have moved shipping dates to end of October for the unit I need.

I did find the lingenfelter trg-002 that allows a 58x/4x to run on a 24x/1x. Holley only had ev1 injectors and I have ev6 and I thought adding $300 to the 1k price to do something even ling was a little like “I don’t know man…it should work?” Add it about 1400 for this one engine I figured I depin and tune for much less.

I ordered a harness and ecm for $275 shipped. I’ll depin the harness and program the ecm. I plan on HPTuners ($600) unless there is better advice. I’ll just need a pair of O2’s and I’ll be in business.

I made a run stand and here pics as of now. I’m waiting on the new bell housing for the flywheel and starter. Getting a little closer everyday.

The run stand is a 4x4, some casters, a 2x4, some pocketholes and lag bolts. I figure I will get it running and tuned on stand before lifting it up with gantry crane and in.

https://i.postimg.cc/JyZBLQfG/93510F...BB55CC3DCB.jpg

https://i.postimg.cc/5YmYH2NJ/9F9CA7...7F0B09E1ED.jpg

https://i.postimg.cc/Q9DKxTDS/C7B6E0...B8B30913DF.jpg

Should be picking up bell housing tomorrow. I’ll be adding a plywood control plate for gauges and ignition switch to make sure it’s all good. I’ve been trying to figure out the cooling. It’s been kind of pain finding the fittings and hose locally (without getting destroyed on money).

Xcomunic8d 08-21-2021 10:58 PM

So here it is with exhaust manifolds on.

https://i.postimg.cc/Cnzd74Mm/5BB613...2317A0BAEE.jpg

Problem with coilsÖ
https://i.postimg.cc/z3BLqqwK/914B0E...410445E876.jpg

Iíll have to relocate the coils using ict billet stuff. #ís 551115-01, 551532- donít forget custom length plug wires not sure which ones yet Iíll use.

https://i.postimg.cc/YGSS2xFM/B5C726...B69B73A453.jpg

Iím working on the cooling system. Iím trying to get a drawing of what I envision but Iím artistically challenged. Itís not going to be cheapÖ I have a friend that runs a local plumbing shop.

The harness and ecm should be here Tuesday.
Iím working on ordering the HP tuning supplies and fuel system as we speak.

FLexpat 08-22-2021 01:23 AM

Make sure you put a remote oil filter kit and remote drain valve kit on that - it will save you a ton of time and frustration. Does it have an aluminum oil pan? Oil pan rust-through is a giant problem with deep bilges.

Xcomunic8d 08-22-2021 07:06 AM

Has an aluminum oil pan that I have seriously coated in paint and primer. Everything’s been or getting painted… Definitely putting on a remote drain kit (flip lever with hose out the drain plug style). I’ve been arguing about an oil cooler (requiring remote oil filter). It’s probably worth it.

https://i.postimg.cc/478KRxWL/LS_Cooling1.jpg

https://i.postimg.cc/cg1KznBt/LS_Cooling.jpg


This is what I’m going for but above shows fitting sizes. I was toying with doing a pipe manifold with 4 inputs on bottom of manifold (already has threaded holes) but think dual in and out will give more flow.

https://i.postimg.cc/c62HRj2n/514607...A53-AEFC20.jpg


Input, suggestions, etc, please.


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