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87MCProstar
04-02-2007, 10:40 AM
Just curious if I could be getting more speed out of the boat then I am getting. I have a velvet drive 1:1 tranny with a 13x13L 3 blade prop. My top speed is like 43/44 and not sure what rpms are at though, just around 5000 i think. Look at both acme's and oj's site and noticed they go up to 13x15 or 14x18. Is there a noticeable difference in those pitches.

Jim@BAWS
04-02-2007, 10:52 AM
The OJ 13 x 14 Stainless might be your ticket. MAX RPM on a FORD 351 is about 4400 RPM's. A 14 x 18 will not work on your boat.

Call me if we can help

Jim@BAWS

TMCNo1
04-02-2007, 10:53 AM
If speed is as you stated, then 4200 to 4400 rpm is the normal rpm. If you change props to gain speed, you will loose holeshot and low end pulling power, but contact Eric @ OJ Props or Acme and let them tell you exactly what to expect with what prop and maybe the can make a recommendation so you can go racing.

BrianM
04-02-2007, 10:56 AM
Call Eric at OJ props or give Bill a call at Acme. Either will be able to hook you up with a prop that will work for your needs.

I ran an Acme #541 13 x 12 3 blade on my '88 and although it ran the same top end of about 44 mph it was substantially faster out of the hole and held better speed through the course and was silky smooth. Had the same results with a 13 x 12 OJ XMP that I tried as well.

erkoehler
04-02-2007, 11:03 AM
i am with Brian acme 541 is the all around best acme prop for your boat. i do not know the size number of the Oj that would be the best for you.

87MCProstar
04-02-2007, 01:03 PM
Its not about going racing, more of the fact that I weigh 215lbs and love to long line barefoot. And with the boat running 43mph is just fast enough for me not doing any tricks, and is a little slow for one foots. I was curious what prop would get me to like 45mph. Thanks for all your help.
Tim

east tx skier
04-02-2007, 01:06 PM
Some GT40 or GT40p heads should get you to 45 mph or more. My boat gets 45.5 at 4,600 rpm. Your boat shouldn't have as much wetted surface as mine, so that 40 hp bump should do a great deal for the top end. While the 541 or comparable OJ XMP might let you keep low end and offer some better tug out of the hole, I don't think either of those props will give you too much more on top from my experience with them. If anything, I'd think you'd need to increase pitch for more top end.

TMCNo1
04-02-2007, 01:17 PM
Its not about going racing, more of the fact that I weigh 215lbs and love to long line barefoot. And with the boat running 43mph is just fast enough for me not doing any tricks, and is a little slow for one foots. I was curious what prop would get me to like 45mph. Thanks for all your help.
Tim


Sorry, just adding some wrongly taken humor, my bad.:o

BrianM
04-02-2007, 01:18 PM
Its not about going racing, more of the fact that I weigh 215lbs and love to long line barefoot. And with the boat running 43mph is just fast enough for me not doing any tricks, and is a little slow for one foots. I was curious what prop would get me to like 45mph. Thanks for all your help.
Tim

I have a feeling that getting that boat to do 45 mph pulling a 215lb footer is going to be tough if not impossible. You may be able to prop it to do that speed but it will probably be a dog out of the hole. ICBW but I doubt it. GT-40 heads and a different intake might get you there but that is going to set you back probably $1000+ in parts plus labor if you have someone do the work.

east tx skier
04-02-2007, 01:28 PM
The heads (GT40p) off a 98 Ford Explorer V8 will get you there if you go the salvage route. You ought to be able to hit 45 mph without the intake, but that's just a guess.

Check ebay for the heads.

TMCNo1
04-02-2007, 01:55 PM
I'd just go the juice route,

TRBenj
04-02-2007, 02:54 PM
Some GT40 or GT40p heads should get you to 45 mph or more. My boat gets 45.5 at 4,600 rpm. Your boat shouldn't have as much wetted surface as mine, so that 40 hp bump should do a great deal for the top end. While the 541 or comparable OJ XMP might let you keep low end and offer some better tug out of the hole, I don't think either of those props will give you too much more on top from my experience with them. If anything, I'd think you'd need to increase pitch for more top end.

The 1:1 Nautique guys have seen top end gains ranging from 1-3 MPH going to the Acme 540 from the stock 13x13. (The 540 is the RH equivalent of the 541.) The hulls are completely different, so youre mileage may vary- but gains are certainly possible. Speaking from experience, the prop is the single biggest upgrade you can make to your boat. On my boat, not only did the Acme increase my top end by 1MPH, but it held speed better too. My top end of 43 was only reduced to 41 with a 190lb footer.

If I were you, Id spring for a 541 without hesitation- if afterwards you decide you still need more speed then we can start making suggestions. A prop is definitely the best place to start.

87MCProstar
04-02-2007, 05:58 PM
To me it sounds like i'm just better off losing 15 lbs. But those GT40 heads are normal automotive heads off an explorer? And while on the topic of aftermarket upgrades, what automotive parts work in the internal marine engine??

PendO
04-02-2007, 06:03 PM
Before you put a stainless steel prop on you should ask some of the "locals" on the board about the added expense of hitting something with a SS prop ... I know a guy who bought a used prostar for 7500, took it out, hit a rock, and is now looking at 5000 in repairs ... stainless if fast, but not forgiving:)

east tx skier
04-02-2007, 06:28 PM
The 1:1 Nautique guys have seen top end gains ranging from 1-3 MPH going to the Acme 540 from the stock 13x13. (The 540 is the RH equivalent of the 541.) The hulls are completely different, so youre mileage may vary- but gains are certainly possible. Speaking from experience, the prop is the single biggest upgrade you can make to your boat. On my boat, not only did the Acme increase my top end by 1MPH, but it held speed better too. My top end of 43 was only reduced to 41 with a 190lb footer.

If I were you, Id spring for a 541 without hesitation- if afterwards you decide you still need more speed then we can start making suggestions. A prop is definitely the best place to start.

I'm sure it varies, but in my case, going from a 13x13 OJ legend to a 541, my top end stayed exactly the same on the GPS.

That is not to say that Tim isn't right about the prop being an incredible upgrade. Absolutely money well spent.

east tx skier
04-02-2007, 06:31 PM
To me it sounds like i'm just better off losing 15 lbs. But those GT40 heads are normal automotive heads off an explorer? And while on the topic of aftermarket upgrades, what automotive parts work in the internal marine engine??

They are automotive heads.

Somebody will have to add to this list as I've had memory fade, but it's automotive except for ...

1. The carb
2. The Starter
3. The Alternator
4. ....

87MCProstar
04-02-2007, 09:16 PM
That will help when the time comes to tear down the motor and start anew. Time on this message board as been time well spent.

Footin
04-02-2007, 09:20 PM
Hey 87, looks like we are in the same "boat"......I weigh about 210 and one foots were a little week until I went with an Acme 541, world of difference from stock.

87MCProstar
04-02-2007, 09:22 PM
Sounds like I definately need to invest in a 541 then.

Upper Michigan Prostar190
04-02-2007, 09:22 PM
Hey 87, looks like we are in the same "boat"......I weigh about 210 and one foots were a little week until I went with an Acme 541, world of difference from stock.
NO WAY! you cant weight 210!!!!?????!!!! how tall are you? NOw way! I am like 205 or so. how can you weigh 210? your not taller than me are you? and your dam sure thinner than me!:confused: :confused:

Footin
04-02-2007, 09:24 PM
NO WAY! you cant weight 210!!!!?????!!!! how tall are you? NOw way! I am like 205 or so. how can you weigh 210? your not taller than me are you? and your dam sure thinner than me!:confused: :confused:

6'1"........all solid muscle. hehehehehe

87MCProstar
04-02-2007, 09:30 PM
Where is the cheapest place to buy a 541??

Footin
04-02-2007, 09:36 PM
I think everywhere is about the same....about 330 to 350.

BriEOD
04-02-2007, 09:41 PM
Same boat, w/stock OJ 13x13 prop with an aftermarket Edelbrock intake, on a long block with under 200 hours on it and I have hit 44+ on a military quality GPS.

BrianM
04-03-2007, 10:40 AM
Where is the cheapest place to buy a 541??

www.wakeside.com has a good price on it plus you get reward points for future purchases. Good people to deal with also.

On another note you might want to give the OJ XMP 13x12 a try as well. That prop is equivalent to to #541 and is a great prop. Max at www.skiertoskier.com has good prices on the OJ. Or just give Eric at OJ a call. Either of those guys will treat you right.

east tx skier
04-03-2007, 10:56 AM
These are the least expensive I've seen. $335.

Propellers Online (http://www.propellersonline.com/Acme3bl.php)

On a side note, Schnitz's prices sure have gone up. I bought mine from him in 2004 for $295 delivered. Today, looks like $395.:eek:

BrianM
04-03-2007, 11:14 AM
Skier to Skier has the XMP for $330 with free shipping. Can't say enough good things about Max and his customer service.

Looks like Wakeside went up quite a bit since last time I check on the Acme. $379.

TRBenj
04-03-2007, 12:18 PM
They are automotive heads.

Somebody will have to add to this list as I've had memory fade, but it's automotive except for ...

1. The carb
2. The Starter
3. The Alternator
4. ....

4. Distributor
5. Fuel pump

The GT40p heads are what was used on a 97+ Explorer/Mountaineer. The GT40 heads were originally installed on the Mustang Cobra and Lightning pickup. The p's outperform the regular GT40's by just a touch.

87MCProstar
04-03-2007, 07:20 PM
So those GT40p heads fit on all ford long blocks i take it?

TRBenj
04-04-2007, 09:12 AM
So those GT40p heads fit on all ford long blocks i take it?

Yup, theyll bolt up to the entire Windsor family (289-302-351). The bolt holes need to be drilled out for the 351, as they are originally 302 heads.