Barefoot Props |
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footer89
Newbie Joined: November-24-2008 Location: United States Status: Offline Points: 18 |
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Posted: August-03-2012 at 12:17am |
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I have searched around looking for a prop preference for the BFN. I have an '89 with a 454. Currently I have an Acme 542 that was tweaked by Acme to give a few extra rpms. What are the advantages of the Acme 1598. I have also ran an OJ 14x14 .... Any suggestions?
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BuffaloBFN
Grand Poobah Joined: June-24-2007 Location: Gainesville,GA Status: Offline Points: 6094 |
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How many rpm's are you turning with the 542? Only from what I've read...seems the BBC would over spin that one? Shows what I don't know about the different sizes.
I got a 1598 on advice from here; luv it. |
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hotboat
Gold Member Joined: March-28-2009 Location: Conn Lake Pa Status: Offline Points: 814 |
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542 = no way correct
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Brian
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JoeinNY
Grand Poobah Joined: October-19-2005 Location: United States Status: Offline Points: 5698 |
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Agreed an acme 542 would be way too small a pitch prop for a healthy barefooter with a 454.
An acme 540 will also usually spin too fast and use more fuel than necessary for all around day to day usage. But, if you are looking for maximum holeshot and are regularly pulling multiple deeps or bigger guys then it can be a good choice. An acme 430 is a good all around choice. OJ makes several fine choices as well depending on your performance goals.. but I dont have direct experience driving barefoots with them. |
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BuffaloBFN
Grand Poobah Joined: June-24-2007 Location: Gainesville,GA Status: Offline Points: 6094 |
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Something is amiss. |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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I agree but, maybe he's turning that big block at over 6500! |
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Offline Points: 21169 |
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A 542 would most likely spin around 5200 on a stock bfn. Way too high for all around use, but should have one hell of a holeshot! Kurtis runs a 540 on his '87 and it turns right at 5k.
On the late direct drives (87-90) I might be inclined to run the 430 as joe suggested. It should run in the 4600-4700 range. The 1598 is a great prop as well (we run it on our '79 bfn) and it should turn very similar revs to the stock 14x14 (~4400). |
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tullfooter
Grand Poobah Joined: March-02-2007 Location: White Lake, MI Status: Offline Points: 2225 |
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I think it's time for a rebuild (1750 hours). My 542 ( P.O. says the prop was "custom" made for the boat, something about a .115 cup) is only spinning around 4300.
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Play hard, life's not a trial run.
'85 BFN '90 BFN White Lake, Michigan |
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hotboat
Gold Member Joined: March-28-2009 Location: Conn Lake Pa Status: Offline Points: 814 |
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Are u sure??? At wot? That's not barefoot speed is it? Lol my martini spun the 540 almost 6000 and my 90 ski 5400 ish
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Brian
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hotboat
Gold Member Joined: March-28-2009 Location: Conn Lake Pa Status: Offline Points: 814 |
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Steve I know where there's a bfn for sale that's not tired 700 hrs,, my garage
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Brian
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tullfooter
Grand Poobah Joined: March-02-2007 Location: White Lake, MI Status: Offline Points: 2225 |
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Is the 91 still available? |
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Play hard, life's not a trial run.
'85 BFN '90 BFN White Lake, Michigan |
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hotboat
Gold Member Joined: March-28-2009 Location: Conn Lake Pa Status: Offline Points: 814 |
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You bet, only had it out once this year so far about a month ago. Craziest summer at work in years as well as put my last dog down but got a new e mastiff 2 nights ago
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Brian
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mdvalant
Grand Poobah Joined: May-06-2009 Location: Bellevue, IA Status: Offline Points: 2059 |
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We run a 1598 on the 07 330 excal for show team use. That prop is a hoss. Sorry, no idea about BFN's but didn't know anyone else used a 1598 for anything. Neat to know what you guys like that on.
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Offline Points: 21169 |
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I would imagine that's only 41mph or so (unloaded)? And only pulling a footer ~39? Is that right? Get a gps to confirm. Either your tach can't be trusted, or you've got some major issues. It should be downright scary out of the hole with that prop on a 454. |
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mdvalant
Grand Poobah Joined: May-06-2009 Location: Bellevue, IA Status: Offline Points: 2059 |
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thread jack, sorry Steve...I have dibs on the pontoon trailer and the dock is sold alrady I think
ok, carry on. |
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Offline Points: 21169 |
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I've heard of some 1.23-1.26 boats running 13x14's for ski team duty. Gotta be a nice holeshot/pulling prop on boats that came with ~13x15.5 wheels. The original application for that prop was the big block 1:1 boats, which ran 14x14's from the factory. |
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tullfooter
Grand Poobah Joined: March-02-2007 Location: White Lake, MI Status: Offline Points: 2225 |
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Brian
I have a guy who may be interested (and I too am still interested). I will let you know within a week. Tim You are correct with your estimates. The speedos show around 42 without a footer and 40 with a footer and two in the boat. I am trying to get two more MPH's before our race next weekend. I hope to do a timing check on Saturday. I know this may sound funny, but I've lost about 2 mph this season. One issue is that I normally run 93 octane, but my kids have been putting the 87 in for the last two tankfuls. I plan on running the half tank of 87 out tomorrow and giving her some 93. Any ideas on how to get all she has? Mike I didn't think that trailer would last at $750. Good purchase. |
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Play hard, life's not a trial run.
'85 BFN '90 BFN White Lake, Michigan |
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tullfooter
Grand Poobah Joined: March-02-2007 Location: White Lake, MI Status: Offline Points: 2225 |
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BTW
I have two band new stock props that came with the boat. Do you think the stock prop would add top end? |
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Play hard, life's not a trial run.
'85 BFN '90 BFN White Lake, Michigan |
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hotboat
Gold Member Joined: March-28-2009 Location: Conn Lake Pa Status: Offline Points: 814 |
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All u can do is try the props Steve, run 93 and see what your timing is now when the advance is all in, try 32 degrees full advance then try 36 full advance, see what it likes
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Brian
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Offline Points: 21169 |
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Steve, you're missing 7-8mph, that's kind of a big deal. Have you verified the speedos with a gps? The airguides are only as accurate as you set them to be.
If the speed is correct, Then how handy are you? I'd be going through the ignition system first- when's the last time it was tuned up, timing set, etc? If recent, then compression test it. I would not be swapping props. Unless you're pinging on the 87, you won't see better performance with 93. Higher octane doesnt give you more power. More final timing might (ideally you want about 35 deg) and sometimes you need higher octane to keep from pinging with extra timing... But the gas alone doesnt add hp. |
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tullfooter
Grand Poobah Joined: March-02-2007 Location: White Lake, MI Status: Offline Points: 2225 |
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I'm going to do a compression test soon, wires, plugs fuel filter are all fresh. Timing is the big question. When you say advanced timing of 32-36, 35 being the ideal, what is the timing spec? And are you saying 35 btdc? I think it's on my valve covers, but I'd like to know before I head to the boat.
footer89, Sorry for the thread jack. I'll buy you two beers at the race. |
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Play hard, life's not a trial run.
'85 BFN '90 BFN White Lake, Michigan |
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lewy2001
Grand Poobah Joined: March-19-2008 Location: NSW Australia Status: Offline Points: 2234 |
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Steve that 32-36 degrees will be total timing advance at max or WOT rpms. It is the static advance at idle plus the advance provided by the mechanical system in distributor.
You can keep increasing your static advance until you get your required total advance at WOT. Keep your ear tuned for pinging (sometimes called detonation with good reason ). This is where the higher octane fuel helps. |
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If you're going through hell, keep going
89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
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tullfooter
Grand Poobah Joined: March-02-2007 Location: White Lake, MI Status: Offline Points: 2225 |
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Thanks for that info. I know the static timing should be 10 BTDC. My query is how would you set the timing at WOT? Do you do slight advances to the static timing, then run it at WOT and se what happens? Lewy My uncle just landed here in Michigan for a week long visit. I know it's not close to you, but he came in from Perth. He'll turn 70 on Aug 11th. He bought me my first barefoot wetsuit when I was 16 (32 years ago) |
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Play hard, life's not a trial run.
'85 BFN '90 BFN White Lake, Michigan |
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BuffaloBFN
Grand Poobah Joined: June-24-2007 Location: Gainesville,GA Status: Offline Points: 6094 |
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Set the initial timing at idle; probably 650 rpm's. The advance mechanism in your distributer controls the advance from idle on up the rpm range. If you have the original set-up, you have weights and springs that make up your advance mechanism under the mounting plate for the points and condensor. Also, you don't really set final advance. You set the initial and then check the advance. You either need a nice light or timing tape on your balancer to see where she falls.
These parts can get rusty over time and cost performance. I don't know your maintence routines, but since you're asking about it... |
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tbeard
Senior Member Joined: April-26-2012 Location: Fort Worth TX Status: Offline Points: 379 |
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Great thread....My 88 BFN has some vibration (not terrible but annoying) This winter I am going to restore the boat. The previous owner hit something and had the prop cold worked on the boat and the repair looks bad. I have been planning to take the prop to a shop and have it repaired and re balanced. But I wanted some feedback on the performance of the boat...Wide open 4200 RPM at 48 - 49 MPH. Hole shot is strong and the exceleration is excellent. May be a POS prop but the boat runns like a stripped ape. Any feedback would be great...
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Thanks.......Tom
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tullfooter
Grand Poobah Joined: March-02-2007 Location: White Lake, MI Status: Offline Points: 2225 |
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4200 and 48.5 mph. Nice!
This site is great. 10 minutes after I posted, Brian (hotboat) gave me a call to help with my questions. It's almost as if you have a group of buddies along side when you need help with your boat. And Brians thinking of heading to the Buckethead. Hope you do. |
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Play hard, life's not a trial run.
'85 BFN '90 BFN White Lake, Michigan |
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hotboat
Gold Member Joined: March-28-2009 Location: Conn Lake Pa Status: Offline Points: 814 |
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Puttin the pressure on now aren't ya?
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Brian
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Offline Points: 21169 |
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48-49 would be stronger than typical performance for a stock 88. Are those numbers gps verified? 47 would be typical. 4200 is on the low side for the stock 14x14 prop and would not equate to that speed... So something doesn't add up.
Steve, final advance is checked in neutral. A timing light with a built in advance dial helps. Hopefully the timing is all in by 3k rpm but check to see where it stops advancing. |
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hotboat
Gold Member Joined: March-28-2009 Location: Conn Lake Pa Status: Offline Points: 814 |
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Tim bringing your bfn?
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Brian
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tbeard
Senior Member Joined: April-26-2012 Location: Fort Worth TX Status: Offline Points: 379 |
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Steve, I will get you my prop specs but it will be next weekend. I will not be down at the river this weekend and I have no idea what prop is on my boat. (I know that sounds bad but I bought the boat in May and we have skied the hell out of it for 3 months without much reguard to the drivetrain) It runs so good my thoughts were do not try to fix something that is not broke. All I did was change the oil and plugs and ski it:)
As far as your 454 I am a old school BB fan and have found they are very reliable without much maintenance. I would be surprised if you have an engine issue all of a sudden. My suggestion is eliminate other issues first...get an accurate read on RPM, speedo, and then I would focus on external things like prop, ignition and carb, vac leak...things like that. |
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Thanks.......Tom
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