Big_Baller

I pulled my mildly modified (heads / cam / 10:1 compression) .030 454 from my 24’ baja outlaw prior to storage with some plans to upgrade this winter. Plan is to basically build a 575sci like engine with the specs below. I would love to the group to chime in with concerns / suggestions as this is the first marine engine I am putting together. (Sorry I tried to post links to the parts but I guess I am too new, once I hit the 10 post mark ill put up the links to the parts and images of the engine)

454 block bored to .060 over

Ross Racing Forged Pistons 82017 ~7.5:1 compression

Crane Hydraulic Roller Camshafts 169621

Manley BB-Chevy H-Beam Connecting Rods 6.135"

Scat Forged Standard Weight Crankshafts 4-454-4000-6135-L

re using Dart 15200030 heads (119cc chamber) heads on engine now.

Stock 575sci blower
Super chiller intercooler
A1000 Fuel Pump
Young performance 575sci Injection plate

Questions…?
What is everyone using for a lift pump?
Thoughts on keeping the stock stroke (468) vs stroking to 496?
Who is flashing 575sci ECU’s for modifications?
Are most people running wideband 02’s to monitor af?
Anyone running smaller blower pulleys? what boost are you seeing?
where is the stock knock sensor located on a 575sci?

BBYSTWY

I would bump the compression a little personally...the 7.5:1 is a really conservative mercury number...I'd go to 8:1 but that's just me...that's about all the advice I can give lol

gonna be a sweet setup!! post up some pics!! miss seeing the blower setup when I go into my spare room hahahaha

Big_Baller

Generally I would not go below 8:1 on automotive application but figured the extra load on the engine would warrant the slightly lower compression? Thoughts?

-Nick

BBYSTWY

I'm at 8.2:1 on mine with an 8-71...and being a smallish blower for that motor bumping the compression will compensate for the size of the blower....at least that's how it was explained to me when I was gonna use that blower lol

Big_Baller

Makes sense, I have been running 93 with the 454 that came out of the boat, what kind of boost were you able to run on 93? Do these ECU's pull timing if knock is detected?

-Nick

BBYSTWY

well to be totally honest I haven't had it running long enough to honestly answer that...I saw 5 at wot but then I had some valve issues..i also changed the pulleys when I just put the motor back in to up it a little...I'm shooting for 8 lbs which is what was recommended by the builder and some people on here...hopefully others will chime in with some other opinions

Big_Baller

Have people had any issues running the A1000 pump ? I would be also plumbing in a return line so hoping vapor lock will not be an issue ?

Big_Baller

So between life and issues with the engine builder this project is slowwwwwwwly moving forward lol. I did end up going with slightly higher compression 8.25:1 but most of the other build is the same. Images of the progress are below, currently I am working on wrapping up wiring with the PDM and CAN
keypad, running hydraulic lines from the helm and installing the digital dash.

snapmorgan

iTrader: (2)

Eddie can tune your ECM. I would use a Weldon 1100A pump instead of the Aeromotive. Much better pump for the same money. Mount it low in the bilge and return fuel back to the tank. no need for a lift pump. On my 575 with Brodix heads, I saw about 5# boost with the stock 4" pulley, about 6# with the 3.5" and 7# with the 3" pulley. I had my rotors teflon stripped and picked up 1#. I ran the 3.5 most of the time because the belt tended to slip a little on the 3". The knock sensor mounts low on the port side of the engine block, ECM will pull timing if it detects a knock.

Big_Baller

Yeah Eddie actually put a tune on the ECM based on what we discussed when I bought the injection plate, we will have to see how close it is once I take the boat out. In terms of fuel pump I am looking at the weldon DB2025-A, think that will work well with the set up.