Glastron SX195 5.0Gl SX Penta - Prop recommendation

paradiddle1

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1) Top End Rpm is too low - 4100 rpm
2) Solas 14 1/4 X 23 p Alum.
4) Wide open throttle RPM = 4100 and speed with an average load = 46.5 mph
5) 2000 Volvo 5.0 GL 220hp & SX Penta ( 1.6 ?)
6) Glastron SX 195 bowrider 18.5 ft. 2200 lbs

I just added a SE300 hydrofoil to help holeshot. with 4 people it was terrible.
Previous WOT RPM = 4200 before SE300

I am thinking I need 21p
 

craze1cars

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Re: Glastron SX195 5.0Gl SX Penta - Prop recommendation

And I'm thinking you may need to go all the way down to a 20, or more likely even a 19....

What is your intended usage? Just cruising? If yes, 21 might be good enough, it'll get you to the bottom of your correct 4,400 to 4,800 range. But for watersports? Strive for that 4,800 figure. And for that you need to gain 700 rpms, which will take a solid 4 inches of pitch to acheive.

You are clearly overpropped in any event. A 23 has no place on a boat like that...

Same for hydrofoil. Remove and sell. The remaining holes you drilled can be ignored and won't hurt anything.
 

paradiddle1

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Re: Glastron SX195 5.0Gl SX Penta - Prop recommendation

thanks of the input - I think I will go with the 21p as I am just a cruiser - now rubber hub or not ?
 

Tail_Gunner

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Re: Glastron SX195 5.0Gl SX Penta - Prop recommendation

A solas hr Titan in a 4 blade ss 19p would really fit your application well about 300 here at i-boats...Or a 20p 4blade amitia in alum would work...Doesnt matter as to hub type which is cheaper..The 19 will launch that boat and maintain excellent midrange performance.

Just read your post on hub type...and the sand bar. If you had ss your prop would still be ok..and your drive....
 

paradiddle1

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Re: Glastron SX195 5.0Gl SX Penta - Prop recommendation

lower pitch (19 or 21) will it also help my holeshot and low speed/idle speed headway?

why 4 blade vs 3 blade ?
 

Tail_Gunner

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Re: Glastron SX195 5.0Gl SX Penta - Prop recommendation

Hmm i have the same hull type engine and gearing. A 20p 4 blade ss is perfect for myself and another...With the kids and associated gang members its a 18p...(8 people)

1. Wide open throttle RPM = 4100 and speed with an average load = 46.5 mph
2.just added a SE300 hydrofoil to help holeshot. with 4 people it was terrible.
Previous WOT RPM = 4200 before SE300
3. as I am just a cruiser

23@4100
22@4300
21@4500
20@4700
19@4900

A 19p 4 blade ss will greatly improve hole shot....improve midrange....lower planing speeds and run smooter...and you should be able to run @ about 50 with that prop. The HR titan is a very good prop and inexpensive

Yes you could prop for top overall speed but how often do you run at WOT..mabe for 5-10 minutes...compared to running at 3000 for hours.

If you want top all out performance for just 2 or maybe 3 people a Stilletto Bay Pro 4 blade In a 20p SS is the prop...But more than 3 people will pull your Rpm down a bit...In the end you always give up something and a engine running at optiium loads is the better choice... than being able to run @ 55mph for a few minutes vs 51 or 52
 

ramster

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Re: Glastron SX195 5.0Gl SX Penta - Prop recommendation

I have the exact same boat, and I used the Mich. Wheel Apollo SS 14X20 four blade. Great prop and inexpensive, I ran 55 @4900 with my normal load (two adults 2 teens) great holeshot too.
 

paradiddle1

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Re: Glastron SX195 5.0Gl SX Penta - Prop recommendation

I am hearing a lot of 4 blade - 14 x 20p. I ordered the Michigan Vortex ( I'm cheap but may upgrade to SS at a later date).
 

craze1cars

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Re: Glastron SX195 5.0Gl SX Penta - Prop recommendation

That should be a good choice for you. Please report back your results after you run it...good or bad. It's always helpful to see if theories on math and paper pan out in the field, as there are sometimes exceptions.

I would also suggest running the new prop both with and without the hydrofoil to see what it is doing to your handling and performance. In my experience, a boat of your type usually does not respond real well to foils....
 

ramster

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Re: Glastron SX195 5.0Gl SX Penta - Prop recommendation

I tried the vortec 14X20 AL, I don't think you will like it, it turned way to many RPM's, and was slower everwhere than my original 21 3 blade AL. The four blade Apollo 14X20 SS you will like.
 

paradiddle1

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Re: Glastron SX195 5.0Gl SX Penta - Prop recommendation

I tried the vortec 14X20 AL, I don't think you will like it, it turned way to many RPM's, and was slower everwhere than my original 21 3 blade AL. The four blade Apollo 14X20 SS you will like.

I hope I was able to cancel my Vortec order in time ......

How was your 14 x 21 3 blade alum?
 

ramster

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Re: Glastron SX195 5.0Gl SX Penta - Prop recommendation

The factory Volvo 14 1/2 X 21 worked pretty good all around, but I can never leave well enough alone. If you run light most of the time the 21 is fine, but if you tube or ski, and have 5-6 people, the four blade 20 really works much better. With a light load the Apollo will run close to 5000 rpm@ 55MPH, with a full crew you should still see 52-53mph @ 4800rpm. I also ran a Stilletto 14 1/2 X 21 and could only spin it 4400rpm @ 55mph with a light load, and with a full load the engine was just lugging too much. I think the four blade Apollo is a good match for the 5.0 because it's not a super aggressive design but better than aluminum, and loads the motor just right. The blade geometry of the Vortec is just too conservative for your V-8. Funny how two different props of the same pitch can have totally different performance. Other props to avoid for your setup are the Solas Amita 14X21 four blade, lugs the engine too much, and the 3-blade Apollo 14 3/4 X 21 just did not work well on my boat. Then you build a 350 HP 5.7 like I did and start the prop search all over. Another thing you can do is install a Q-jet four barrel, fits right on your factory intake, really wakes up the top end.
 

paradiddle1

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Re: Glastron SX195 5.0Gl SX Penta - Prop recommendation

OK I did order that 4 blade Apollo SS 14 x 20p and tried it out today. I left the SE 300 tail fin on and went out by myself. It does hole shot great at full or partial throttle. I can get up on plane to a low of 18 mph. The acceleration is great. I topped out at 4500-4600rpm at 50 on the GPS. I would like to try without the Se 300 to see hole shot and top end effect. I will have to check my carb to make sure I'm getting full throttle also
 

paradiddle1

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Re: Glastron SX195 5.0Gl SX Penta - Prop recommendation

I took the Se 300 Tail fin off because at full throttle power up it would porpoise 1-2x times before planing. Other than that no difference and max rpm = 4500 at 47-48 mph. I am thinking I need a 19p? I don't need the 50+mph but like the quick planing. It looks like I Boats is discontinuing the Michigan XHS 4 blades so I guess I go back to Solas Titan for 19P?
 

ramster

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Re: Glastron SX195 5.0Gl SX Penta - Prop recommendation

If you are only turning that Apollo 4500, I think you are down on power. Have you done a recent a tune up? Clean the carb, change the fuel filter, check your cap and rotor for corrosion. My cap had aluminum contacts and they were caked with white powdery crust, I got a cap from NAPA and it had brass contacts much better. You should be spinning that prop to at least 4800 no problem.
 

paradiddle1

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Re: Glastron SX195 5.0Gl SX Penta - Prop recommendation

If you are only turning that Apollo 4500, I think you are down on power. Have you done a recent a tune up? Clean the carb, change the fuel filter, check your cap and rotor for corrosion. My cap had aluminum contacts and they were caked with white powdery crust, I got a cap from NAPA and it had brass contacts much better. You should be spinning that prop to at least 4800 no problem.

Did a compression test and it was 165-175 psi all 8. The cap and rotor look good and it is brass. The contacts could use some cleaning. Plus look good - Champ RS 12YC - Wires are marine grade Stainless.

My next thing is to pull the float bowl and clean out the jets. It should be a Marine Holley 2300 500 CFM ? I assume and uses the same gaskets as auto. I will replace plugs any way and maybe cap and rotor and check timing

I pulled float bowl and all clean - has 69 jets - I think that is factory. I am thinking of checking timing and maybe trying a step leaner on the jets. Hot time of year with humidity - less oxygen. replaced fuel filter/seperator also. Filled with 93 oct and will test again. replaced all new plugs RS 12yc and cleaned contacts on rotor and inside cap with brass contacts.
 

ramster

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Re: Glastron SX195 5.0Gl SX Penta - Prop recommendation

Sounds like you did all the right stuff, but I would not lean the jetting, if anything richen it up 1 step to compensate for the crappy E-10 gas. I am surprised about the porposing, the Glastron hulls usually have very little bow rise. I did add Smart Tabs to my boat to help with the slow speed wandering, and low speed cruising for tubing and wake boarding. The Tabs did help a little but IMO the SX195 dosen't really need them. I also added a four barrel to my boat, which gave me about 200 RPM and 2-3 MPH on my stock 5.0. A Q-jet will bolt right on your manifold, very easy swap and worth it.
 
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