665 inch BBC for LaveyCraft NuEra29 build
 

It's not everyday I get to play at this level. I've been collecting parts for a Marine 665 inch *naturally aspirated* BBC. That's 4.600" bore x 5.000" stroke. The Winberg billet crankshaft just showed up today :) I also have a photo of the Crower billet 7.325" long rods next to a stock length Manley rod for comparison. Custom RaceTec pistons, etc.

This is for John Mosetti's (BUP) 29' LaveyCraft NuEra that is currently being built. If you haven't seen the build on the boat, it's completely awesome. Follow this link: http://www.laveycraft.com/construction-of-29-nuera

I'm going to photo document the assembly of this engine as I go so you can see how I do it. That doesn't mean I'm right or wrong, it's just how I do it. I won't get going on this until after PRI sometime, but I thought I'd share the start of it.

The very first thing I did was pick out a block. I decided on a Dart Big-M pro. The reason for this was that I could get it in an 11.1" deck, it already came with 55mm cam bearing bores, .903" lifter bores, steel caps, and it has room for a 5" stroke with the spread pan rails and .600" raised camshaft position.

The next thing I did was to select a ring set. Why were rings #2 you ask? I needed to know the ring width and radial depth before I could order pistons. I also had to decide on a cylinder head so the correct valve angles, location, and spacing would be known. Once we figured out the rings (.043x.043x3mm in this case) I ordered the pistons. I am shooting for 9.5:1 compression or a tick more so I ordered the pistons with a 24cc dish figuring a 119cc combustion chamber. Once I knew the pin height on the pistons I could order the connecting rods. 11.1" deck - 1.27" pin - 2.5" (1/2 stroke) -.005" (piston to deck) = 7.325" rod.

After the block, rings, pistons, and rods were delivered and bearings were mocked up in the block, everything was checked dimensionally and weighed. The crankshaft was ordered to bob-weight . I would have ordered it to a finished pin size rods and mains but that was an extra 8 weeks (Winberg had a semi-finished 5" stroke partially finished) so I may have to play with bearing shells to get the clearance I want.

At the same time, the Brodix BB3XO-332 cnc oval port heads are at Chad Speier's (Speier Racing Heads) place getting worked over to meet the requirements that I have for this engine. That meant a camshaft had to be ordered so I knew the peak lift and then the valves, springs, retainers, locks, and locators were also ordered.

As you can see, one little decision affects the entire package. It's best to write it all down on paper before you ever order a single part.

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Cool, looking forward to following this. That crank is a work of art.

Nice build but think you need more cylinder head for the cubes.
That thing will make a bunch of torque.

The goal is 900hp. These heads will go there with ease.

This is gonna be a badass build!

But an engine thread on OSO, at the beginning of fall? I'm predicting 300 pages plus... :food-smiley-007:

hopefully it all good popcorn ^^^^ haha

As exotic as this piece is it's going to take some time to get it together correctly. I'm going to do my best at a photo documentary and post here as the build goes along. I hope to be on the dyno with it before the end of February. Really our goal is to duplicate the performance of something like a Teague 825 but without the supercharger.

How big of a camshaft you going to run? I ran the 351xo brodix that did run 900hp they make great power. How much work is chad going to do to them? Thanks

Cam is 267/271 @ .050", .775" ish lift, and 114 LSA.

Chad is doing whatever he needs to ;)

BUP, have your balls started to grow since this started ? :D

This is awesome and I can't wait to see the finished product.
Mark from MER Performance is turning reliable 825-ish HP out of Holley Injected 572s in an OSO member's boat.
I would think done right, pushing 900HP should be doable.

Rod ratio 1.465?

Yup.

What RPM is this monster bringing the goods?

6000 ish

What's the total cost for a N/A big inch engine like this? Parts/Labor/etc.

I don't really know yet. I'm sure we are going to be over $30K. 4 gallon dry sump oiling system alone is pretty expensive and the intake manifold.......... that's not cheap either.

Did I mention what intake manifold I'm going to use? Well it's on order and it looks just like this one only it's going to be a different color ;)

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My WIFE takes care of all that end of the building process.

the poor women

The crankshaft was NOT CHEAP either. jeez. But anyways the bottom end will be built to handle way over the 900 hp.

We do have some sponsors as well.

www.laveycraft.com and I have will be helping each other out and thru out plus continue to do so.

Mark aka 900HP has been a huge help - we talk everyday and basically he has free will on the engine side. I do have a say so as well and we talked about IMO our best options along with parts to buy, build process and so on.

john,what drive will this boat have?

Mike the plan currently is a IMCO SCX upper and a SC lower

that should work.sure glad you didn,t say xr.

I know better than that because I see it enough from other owners using an XR in person with a lot LESS power in their application.

This thing will pull like a freight train.

Your engine is very close to what I had but bigger. [ATTACH=CONFIG]561550[/ATTACH]

What electronics you have picked out? With MSD or individual coils?

No MSD coils on the build. Same coils Merc racing uses, More info - crank trigger, Jesel belt and If recall correctly ATI dampner,

Also - closed cooling as I am working on a custom design with a manufacturer for all that end and the same with them for the cool fuel system and oil coolers. Weldon Fuel pump

^^^^ Who built your engines ?

Yeah BRx sr20 or dart 20s would be good on 632+.

I built them and I also freshwater cooled them
Could probably save you some money on the coolers for engine. Use flat plate cooler off eBay they use them for boilers and fire places.
Don't need fuel cooler for a 2015 or 2025 Weldon pump.
I have tons of info for you.

I am going to use a cool fuel set up just like what ILmor does on a few of its engines, Its such a simple design and very inexpensive. The cooler the fuel is, the better we are all the way around even for power. I really wanted the fuel pumps in the gas tank but have changed my mind about it. Tank depth one of the issues for that end of it among a few other issues. Mercruiser and Volvo are the only 2 left using external fuel pumps on the marine side. I am not going to cool fuel like Merc set ups. I work on enough of those already to know WTH were they thinking. Just saying.

Volvo Penta uses plate oil coolers as well. I like the plate coolers.

Thanks for posting and the help.

Also here in Texas dead of summer vapor lock can be a huge problem regardless of fuel set up. Weldon set ups and manyy other fuel set ups vapor locked - 90 degree lake water temps and 110 degree weather with engine heat soak can = vapor lock here. The only boats I seen in our hottest summer year was the Mastercrafts with the fuel pump cell in the gas tank NOT vapor locked that summer.

I think they are to big. Sr20 is 440cc intake
Big chief I have is 416cc I would of bought the sr20 heads but it would of bin a turd on the low end. Planning would of bin impossible for my boat. I went from 351cc to 383cc and almost would not plane off.

Not trying to sway you on the cooler I know the ilmore has a fuel cooler but they also have the pump getting cooled by the fuel. Merc 1075 has Weldon 2025 pump and no cooler motor on that pump is not cooled by fuel.

You mean the fuel pump heating the fuel. not the other way around. lol
Not talking about the Weldon.

The 20* stuff has the same or less CSA than the large conventional heads (380-400cc). The runner is longer, not a good metric. I think youd need a 632 at least and 665 would be just right for them.

There's some discussion on the ports and CSA if you dig on chevelles or yellowbullet. Saw it the other day.

Any thought on lifter and spring oilers ?

Just curious. Did you get the heads raw? No seats or guides...

You are forgetting that this has to make power from 3000-6000 rpm. A 665 at 6000 rpm moves around the same amount of air as a 540 would at 7400 rpm. IMHO most of the marine builds use heads that are sized more for drag racing than endurance. You have to forget about trying to make more peak power in the last 500 rpm of the curve and concentrate on making a bigger curve. ;)

No. they were ordered bare cnc with seats and guides.

I have valve covers coming from Billet Fabrications with spring oilers integrated in the covers. I'm also doing piston oilers of which I will post photos of the installation/modification procedure. I'm not doing anything special for lifter oiling.

Piston and spring oilers will be installed 4 sure on those. ^^^^ jeez you beat me to it ^^^^^

I thought you were working - you know on a 665 CID for some kind of boat ^^^^

Had to mess with you early here

BUP and I have discussed this as I wasn't too concerned with the fuel cooler using a full return open loop fuel system but apparently there are a lot of boats that suffer from vapor lock or fuel boiling. In the end I don't see where a fuel cooler does any harm other than adding a little weight and complexity. Personally I like to keep it simple but I don't see any harm in a fuel cooler.