1993 Correct Carburetor
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=51180
Printed Date: November-24-2024 at 12:33pm
Topic: 1993 Correct Carburetor
Posted By: pjsmoreno
Subject: 1993 Correct Carburetor
Date Posted: June-13-2023 at 8:55am
|
I need a little help for my buddy on his new purchase of a 1993
Ski Nautique. He has a 351 engine in the boat but with a 750 double pumper Holly
carburetor. I don’t believe this is the correct carburetor for the engine. Is that correct or not? If not, what would be the correct Holly carburetor? Paul |
Replies:
Posted By: desertskier
Date Posted: June-13-2023 at 9:04am
Holley 4160. And tell him not to buy one of those POS Quick Fuels
https://www.holley.com/products/fuel_systems/carburetors/marine_carburetors/parts/0-80319-2" rel="nofollow - https://www.holley.com/products/fuel_systems/carburetors/marine_carburetors/parts/0-80319-2 ------------- 92 SN - Owned since 93 99 Pro Air 89 SN - Went to live on a lake in Texas 75 Donzi 16 - Sold in 93 |
Posted By: pjsmoreno
Date Posted: June-13-2023 at 1:29pm
|
Thanks for the help! We were out on the water yesterday morning for my first time
on his boat. Notice acceleration issues and flooding when trying to start at
times. We talk about rebuilding the carburetor to take care of the problems.
When we were loading up the boat, he opened up the engine cover and I notice it
was a double pumper Holly. Wasn’t sure at the time if it was the correct
carburetor or not. When he looked up the
number for a rebuilt kit on the Holley, it’s a 750. I knew
then it was to big for this small block. |
Posted By: Jonny Quest
Date Posted: June-13-2023 at 11:46pm
|
If you like the double pumper, then Quick Fuel makes a marine M-650. The M-650 is based on the Holley 4150 and is similar to the 750 your friend has now. Keep in mind that the M-650 has mechanical secondaries whereas the M-600 has vacuum secondaries (like the 4160). My personal preference is for mechanical secondaries, but there is nothing wrong with the vacuum configuration. Many, many SBF engines with Holley 4160s and vacuum secondaries were produced...and many are still running today. The 600 or 650 CFM carbs are plenty for your marine application as you typically wont spin much past 5,000 RPMs. A 750 CFM carby is a bit too big -- however, keep in mind that the engine will only aspirate the volume of air/fuel that it needs. So, a 750 CFM will work, but its very doubtful that you will run more than 600 "ish" CFM through it. JQ ------------- Current 2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
Posted By: phatsat67
Date Posted: June-14-2023 at 8:22am
|
Absolutely no way on earth should anyone spend 892 dollars on a vacuum secondary Holley 600. Grab a QF m-600. It may or may not require some slight idle circuit tuning. If you can’t get it set up without minor tweaks send it back to Summit for warranty easy peasy. I’ve had to do that once or twice but I’ve seen plenty of new Holleys out of the box suck too. You’ll have to set up the float level which is easy enough. Recommend starting out low and bring it up slowly. Since someone has messed with the carb already you’d likely need to order a new PCM fuel supply hard line for the Holley anyhow so grab up a Sierra 18-8115 fuel line. Usually you can get a QF with the functioning choke to run basically like it’s fuel injected. Some I’ve set up will even cold start most of the time with no pumps and idle immediately. |
Posted By: pjsmoreno
Date Posted: June-14-2023 at 1:05pm
|
Thanks for all the advance! Really appreciate it. What we are going to do is this. I have a marine Holly 650 with vacuum
secondary on the shelf in my garage. It’s my old Holley that I replace some
years ago from my boat. It’s been rebuilt and tested out so it’s good to go. I
know we should put a 600 on the engine but checking to see if this was an
option I called a few guys up who knows marine engines and they both said it
will work fine on that engine. And Jonny Quest help in convincing that matter even
more. And he doesn’t have to spend 900
dollars. He has a close friend that I’m willing to give it to him. We have known
each other since we were seven or eight a long time ago. As to the fuel line, yes,
we will need to make that change over. Either with PMC hard fuel line that is
suggested, making our own metal fuel line or go with a branded fuel line that I
might have most of the connecters to do that and branded line. Depending on how
long the length is. |
Posted By: pjsmoreno
Date Posted: July-28-2023 at 8:33am
|
Just a follow up on putting the Holley 650 on a PCM351. My bubby finally got the carburetor on a
couple of weeks ago. A lot of texting and face timing in helping him out. There
was an issue with the accelerator pump diaphragm leaking and getting a new fuel
line from the fuel pump on the engine to the carb. Both were easy fixes. This past Wednesday we both had the day off and hit the lake
to do the final adjustments in checking the timing and adjusting the idle screws.
Engine ran extremely well. Way better than it was prior to the change out. |