SoCal Jet Boats

Tech Talk => Engine Mechanical / Electrical => Topic started by: sportinwood on May 21, 2014, 09:52:40 AM

Title: Holley carb model
Post by: sportinwood on May 21, 2014, 09:52:40 AM

Took a quick picture of the model # on my carb. Trying to find out what it is. Pretty sure its an 850 but I am trying to hunt down a diagram of it to adjust tuning and all that fun stuff.



Sent from my XT1058 using SoCal Jet Boats mobile app

Title: Re: Holley carb model
Post by: Just Electric on May 21, 2014, 10:00:39 AM

600cfm carb 410 vacum secondary according to my Holley bible


Sent from my iPhone using SoCalJetBoats mobile app

Title: Re: Holley carb model
Post by: Just Electric on May 21, 2014, 10:01:58 AM

Here's a pic might have to zo in



Sent from my iPhone using SoCalJetBoats mobile app

Title: Re: Holley carb model
Post by: 93_ultra on May 21, 2014, 10:06:53 AM

Quote from: sportinwood on May 21, 2014, 09:52:40 AM

Took a quick picture of the model # on my carb. Trying to find out what it is. Pretty sure its an 850 but I am trying to hunt down a diagram of it to adjust tuning and all that fun stuff.



Sent from my XT1058 using SoCal Jet Boats mobile app

I think I have that same carb. Can u take a picture of the whole thing?

Sent from my SCH-I545 using SoCal Jet Boats mobile app

Title: Re: Holley carb model
Post by: sportinwood on May 21, 2014, 10:10:00 AM

I can get a picture of it when I get home this afternoon. I was running out the door and just grabbed a picture of the numbers to start.

Thanks for the info to start though. I did some searches and just couldnt land on any good information.

Title: Re: Holley carb model
Post by: crewchief22 on May 21, 2014, 06:19:51 PM

I'm pretty sure that is one of Holley's 4010, 4011 series carburetors that were only available for a few years and discontinued by Holley before 2000. 

Unless you are emotionally attached to this carb, I'd recommend getting a traditional Holley 4150, 4160 style carb or one of the clones that are available new or used just about anywhere.

Title: Re: Holley carb model
Post by: sportinwood on May 21, 2014, 08:28:55 PM

These are the additional pictures. I'm running a stock 502 Chevy. I unfortunately don't have a build sheet or any better information on the motor.

Sent from my XT1058 using SoCal Jet Boats mobile app

Title: Re: Holley carb model
Post by: sportinwood on May 21, 2014, 08:38:34 PM

Crew chief, why would it be beneficial to change carbs? Is this just outdated for any rebuild kits or tuning information?

Sent from my XT1058 using SoCal Jet Boats mobile app

Title: Re: Holley carb model
Post by: crewchief22 on May 21, 2014, 09:22:57 PM

When Holley introduced these carbs they marketed them to the street rodders because this was their first attempt at a shiny finish.  The basic design of the carb is a copy of an old Ford (Motorcraft/Autolite) design.  The "best" feature and reason they made them into marine carburetors is that there isn't a gasket surface below fuel level... meaning that it should never be able to leak fuel onto your engine (questionable selling point in my book).

It's one of those things, if you have it and it's in usable shape... run it, but if there is any question of condition or run-ability pitch it and get a traditional Holley design.

A quick search of the List # came up with a aftermarket overhaul kit available to replace the discontinued kit from Holley (sounds to me like Holley even wants you to forget that the produced them).

Title: Re: Holley carb model
Post by: sportinwood on May 22, 2014, 07:18:10 AM

OK, well this thread started because I ran the boat last weekend and after a day out on the water, there was black soot under my swim steps. Never happened before that.

I was told to check floats and all that to make sure nothing got stuck. I was looking for some type of diagram to reference because I am not too familiar with tuning a carb.

I know where and how to adjust the two floats on front / rear. Any other possible things that can get sticky or cause this?

Thanks.

Sent from my XT1058 using SoCal Jet Boats mobile app

Title: Re: Holley carb model
Post by: crewchief22 on May 22, 2014, 07:12:17 PM

How was the boat running otherwise? 

Do you know if the carb has been overhauled in the last few years?  It might be time.

Inspect the needle and seat for debris that could be causing a rich condition.  How old are the fuel hoses, could they be starting to deteriorate from the inside?

Title: Re: Holley carb model
Post by: sportinwood on May 22, 2014, 08:05:18 PM

The boat ran great when it was running. I had to crank it for much longer than normal to get it to turn over.

The fuel lines are maybe 3 years old.

I will inspect this weekend and check the needle and seat.

Thanks for the info and responses.

Sent from my XT1058 using SoCal Jet Boats mobile app

Title: Re: Holley carb model
Post by: crewchief22 on May 22, 2014, 09:13:36 PM

The extended crank time could be due to excess fuel running into the manifold when stopped.

Title: Re: Holley carb model
Post by: sportinwood on May 22, 2014, 09:48:06 PM

When I pull the boat out of the water, i bump the key and it fires right up like it should. Drop it right back in and it cranks for 5-10 seconds.



Sent from my XT1058 using SoCal Jet Boats mobile app