Cascade Crew

blue89 · Posted: Sun Jun 28, 2009 4:15 pm Post subject: boat carb fun

So I took the carb in my boat apart for a seasonal clean. Since I have been reading a bunch on holley carburetor stuff I figured I'd give it a go. Plus the boat has been needing a little extra umph. When I took the throttle plate off I had the idea. So I ground down some new screws, shaved the shaft down, and sudo knife edged the throttle plates. Looks much better and took me less than an hour. Mainly used my sanding paddle wheel on my right angle grinder and a triangle file. I shaved the screw heads down further than from the picture and I did both sides and some red threadlock too.

blue89 · Posted: Mon Jun 29, 2009 7:45 am Post subject:

Got the boat fired up in the back yard. Without changing any settings the engine idled at 350rpm and was smooth! Looked odd to see the pulley's spinning so slow. So I bumped up the idle to 700rpm and called it done. Also cleaned out my backfire suppressor. Should be a wakeboarding machine!

iansane · Posted: Mon Jun 29, 2009 12:45 pm Post subject:

Sweeeeet! I finally got the stereo installed in mine after having it sit on the counter for 3 or 4 seasons. Laughing

Hit the lake on Sunday and I'm going back out on thursday!

blue89 · Posted: Mon Jun 29, 2009 1:53 pm Post subject:

What engine is in yours? I'm thinking a cold air intake on mine would make a huge difference.

iansane · Posted: Mon Jun 29, 2009 5:35 pm Post subject:

http://www.boatcrazy.com/images/sale_owner/2009_malibu_016.jpg

Minus the shnazzy exhaust. Indmar 350. I think it's just a marine version of the vortec motor just a bit more hp.

blue89 · Posted: Tue Jun 30, 2009 9:06 am Post subject:

I might be scoring a TBI setup from a Mercury. That would be fun to have on the boat. Do you have a cold air intake tract on your boat? I'm thinking about doing something like that so I can get some cooler air into the engine. I bet it's sucking in some pretty warm air especially when you are sitting there for a while waiting for someone to get in the water. I was just going to put a normal contained filter housing on it (no filter) and then run the duct over by the side vents. Sounds reasonable as long as it doesn't suck up water, right?

91RSVert · Posted: Tue Jun 30, 2009 12:03 pm Post subject:

I wanna put TPI on a boat motor Very Happy

blue89 · Posted: Tue Jun 30, 2009 12:15 pm Post subject:

That would be fricken sweet! I'd just need to convert mine to chevy Crying or Very sad

Or I could go mustang or F150 mpfi 5.0L.

iansane · Posted: Tue Jun 30, 2009 5:08 pm Post subject:

91RSVert · Posted: Tue Jun 30, 2009 5:46 pm Post subject:

yea, aslong as your running the blower, it doesnt get "too" hot. But if you can easly duct it for fresh air, I dont see how it would hurt.

if you go ford, go with the truck 5.4, or a 4.6s/c Twisted Evil

iansane · Posted: Tue Jun 30, 2009 9:36 pm Post subject:

91RSVert · Posted: Wed Jul 01, 2009 6:59 am Post subject:

As I said, if he keeps it ford.

Now if he goes chevy, yea, Id love to see an LSx in one Twisted Evil

91RSVert · Posted: Wed Jul 01, 2009 7:10 am Post subject:

http://www.castlehillexhaust.com.au/files/boat2.JPG

http://www.castlehillexhaust.com.au/files/boat1.JPG

blue89 · Posted: Wed Jul 01, 2009 8:18 am Post subject:

that would be pretty sweet! Does anyone know if you can simplify the plumbing on a raw water cooled marine engine? Mine has hoses everywhere and I'd like to change the intake and play with it.

HONDASLAYER · Posted: Wed Jul 01, 2009 11:00 am Post subject: Re: boat carb fun

blue89 · Posted: Wed Jul 01, 2009 11:24 am Post subject:

It decreases the obstructed area and lets more air through the carburetor.

HONDASLAYER · Posted: Wed Jul 01, 2009 11:47 am Post subject:

blue89 · Posted: Wed Jul 01, 2009 1:18 pm Post subject:

I am by no means a carb guy. I am learning as I go. I'm trying to help out my 650 and experimented on my 350. I do have the "How to build horsepower vol.2" by david vizard though. And since I have two motors that are undercarbed and I thought I would try it. I'll quote from his book some numbers:

Stub stack or choke horn removal +45 CFM
butterfly and shaft streamlining +35 to 50 CFM (depending on throttle bore)