Please evaluate my exhaust system

[Charles A. Beever III]

Recent repower- older 250hp 6bta in a 236 Mako inboard. Engine was a spare irrigation unit in storage. Little to no use from what I was told.

I just acquired the boat and love it.

I realize I need to upgrade cooling system tank and plumbing away from the old “corner mounted tank” system.

Main question here is do I need a riser? I’m not comfortable killing engine while out fishing due to possible backflow to turbo.

Turbo has some broken blades on compressor side so while out for repair seemed a good idea to explore getting a riser built. Also was considering getting turbo labs to upgrade h1e while it was apart. It would retain same footprint.

At present everything is still together so can take whatever pic you need.

What else can I provide you to move forward?

Best,
Charles

Topic

[Charles A. Beever III]

Thank you Bill. I will help you any way I can. Am currently still gathering critical measurements to find out what kinds of unanticipated hurdles yet await us. These guys are fun to work with.

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Bill Stenger

[Bill Stenger]

Charles please keep me in the loop on your game plan on this. I have a very similar setup and space restraints. I need a dry riser as well. My turbo looked worse than yours did. I bought a upgrade factory holset turbo from Laz, he owns a turbo company in Ft Lauderdale. The new turbo I believe is for the 300hp Engine with the same footprint. I believe it was 1300 to my door. He has the oe part number as well pretty much the same money. If you want the contact info let me know I have the invoice in my records.

[Justin Riege]

The high mount turbo typically works best with V drive setups.

Charles, it sounds like you are pretty serious about addressing this. If you want to discuss some options, shoot me a phone call at the shop. These days I am the one who builds most of the exhaust risers, with some help from Tony on the design work, especially in the tricky situations like these. I am sure between myself and Tony we can come up with a solution. I’ve got a few ideas myself and he has a lot of tricks up his sleeve. Some of the stuff floated here by Rob and Corey might be worth a look too. It all comes down to the physical dimensions. We can all see it’s tight, but exactly how tight?

I can send you a worksheet for you to fill out with all of the critical measurements, and then I can really get a 3D model in my head of the space we have to work with and we can mock a few ideas up on the shop floor. I think Corey’s earlier comment that some fiberglass work may be in your future, but it might be pretty minimal.

I think you are on the right track and it sounds like you want to address this so a phone call can cover a lot of ground much faster than going back and fourth on here.

Justin Riege
805.382.6287

[Charles A. Beever III]

I am not really familiar with that setup, but am open to anything.

[David Shaffer]

Have you considered a high mount turbo?

[Charles A. Beever III]

I’m for “exhausting” every option before cutting into the decks. Would certain measurements help you guys any? Would be great if there was “just enough room” to get a riser in there.

I remember reading one of Tony’s articles where he said in certain cases exhaust diameter can be reduced for short spans and still work well. Would something like that be a possibility here?

[Corey Schmidt]

Charles, that turbo is done… at this point you know the “WHY”…. question really becomes… how do you make enough room given how you’re currently setup to fit a proper riser so this doesn’t happen again? Looks pretty tight in there…

You may be able to get away with a VERY tight up and down design with short radius elbows but I’m not ever sure that you have the clearance for that…

Odds are you may have to consider some fiberglass work for this one…. otherwise the can will ultimately get kicked down the road.

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Tony Athens

[Charles A. Beever III]

Rob-
Had an old K&N. I upgraded to your S&B.

That design just might work. Especially if the heat exchanger could be shimmed away from engine creating space where it now sits for the circular riser. Or maybe heat exchanger could even be mounted remotely??

I will attach a few more pics showing space we are working with.

[Rob Schepis]

What were you running for an air filter?
As to the needed riser – Could something along this geometry be implemented?

[Charles A. Beever III]

Thanks for reply Tony. What is the next step short of dragging my boat to Cali? Want to fix this the SB way.

[Tony Athens]

100% for sure your exhaust side of the turbo in on a salt water diet. Intake side has eaten something also to break the blades like that.

Tony

[Charles A. Beever III]

Also am keen to address riser at this time and can take more pics or measurements as needed.

[Charles A. Beever III]

So here is what the turbo looks like. How bad is it?

Have re-thought get turbo upgraded by a third party. Just want a rebuild by a reputable outfit or exchange for Cummins Recon. Problem is Data Plate is missing from timing cover.

250hp
JWAC
Lucas Cav
Tombstone Aftercooler
Sendure heat exchanger 4603-1-7
Holset H1E – assy 3552228 which doesn’t even come up as a valid turbo at local Cummins dealer

Maybe I could just ask for whatever turbo came on JWAC Lucas Cav 250hp 6bta and call it good?

[Charles A. Beever III]

That would be getting close to strainer setup. I saw a circular setup on one of your writeups that angled fore and up and circled back. Seemed doable.
I’m not saying crossover wouldn’t work. Just trying to apply KISS philosophy.

[Rob Schepis]

Could you go with a crossover to port and then tie into the wet exhaust with a custom angle section of FRP?

[Charles A. Beever III]

Loaded waterline is close to turbo location. Tons of y axis room under hollow center console for riser. Starboard and aft clearances are tighter. Like really tight.

Maybe sen-dure heat exchanger could be slid forward or repositioned to create more space..

Control cables could be repositioned I imagine. I want to do this the right way as long as it doesn’t harelip the pope.

[Rob Schepis]

She’s definitely low on the spillover height. Have you identified the loaded water line? It looks like there is plenty of height under that console when it is lowered but it also looks like the control cables sit right on your exhaust coming off the turbo? Is that right? That can be a bit of a PITA to work around..

[Author]

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