Maximus Prop Help
#1
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Maximus Prop Help
I have a 1994 Cigarette TOP GUN.
2 blown 605hp motors.
I currently have the large diameter stock 28 pitch maximus props.
I am only hitting 4400rpm and 68mph at WOT.
My motors dyno reads 605hp and 5500rpm.
Something has to change.
What should I do.
Change props, lab my Maximus.
2 blown 605hp motors.
I currently have the large diameter stock 28 pitch maximus props.
I am only hitting 4400rpm and 68mph at WOT.
My motors dyno reads 605hp and 5500rpm.
Something has to change.
What should I do.
Change props, lab my Maximus.
#2
Charter Member # 55
Charter Member
To get 1100 rpms, you are going to need to go to a lot smaller pitch. Probably around a 24 and have them labbed. Have you tried any other props???? I would try set of bravo 1 26's.
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When I bought the boat, there were 26 pitch 4 blade hydromotive props. I had new engines built. With the 26 pitch hydromotive props, I hit my mark, 5500rpm, but I did not like them. I had about a 20% prop slip at cruising and I could feel vibration. I went with the Maximus props. Now I don't have vibration. My crusing speed is great, but top end is not. Cigarette racing told me to reduce my Maximus props to 15 1/2 diameter and take half in off the diffuse ring. I don't know what this diameter reduction and diffuse altering will do. As a summary, I had 4 blade hydromotive props, I increased a blade and went up 2 pitches when going to the Maximus, thinking my engines were going to be able to pull it off....I was wrong.
#4
Offshoreonly Advertiser
Offshoreonly Advertiser
Labbing the 24 or 26 ximus at 15.25 and removing the diff. ring will most likely get you where you want to be. I think testing a Bravo 1 prop is a good idea too.
Let us know if you would like to test some props.
Brett
Let us know if you would like to test some props.
Brett
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Brett Anderson / BBLADES Professional Propellers
920-295-4435 http://www.bblades.com/
[email protected]
Brett Anderson / BBLADES Professional Propellers
920-295-4435 http://www.bblades.com/
[email protected]
#6
21 and 42 footers
Platinum Member
that prop is way too far off and you'll never modify it enough to work properly......test some props first if at all possible. There was a set of labbed 26 MAX available awhile ago that would be close.
#7
Charter Member # 55
Charter Member
You said you were at the right rpm with the Hydro 4 blades. You should have gone with 1-2" less pitch in 5 blades to maintain the same rpm with. The increased diameter of the new 5 blades also reduces the rpms.
You need different props. The best thing to do is sell yours and buy some new ones.
You need different props. The best thing to do is sell yours and buy some new ones.
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Thanks Griff.
Why does Cigarette Racing say to take off the diffuse ring?
What does that do?
I have 2 large diameter non-lab 28 Pitch Maximus Props for Sale.
No nicks or dings.
Anyone Interested?
I have the props in the classified section now.
$1400 or trade for 26 Pitch Maximus.
Why does Cigarette Racing say to take off the diffuse ring?
What does that do?
I have 2 large diameter non-lab 28 Pitch Maximus Props for Sale.
No nicks or dings.
Anyone Interested?
I have the props in the classified section now.
$1400 or trade for 26 Pitch Maximus.
Last edited by UrbanDisturbance; 11-05-2009 at 06:53 AM.
#9
Offshoreonly Advertiser
Offshoreonly Advertiser
There is a long story behind the diff ring on the Maximus prop. I was personally involved at Mercury Racing. If you do a search on the prop forum you can find a bunch of information.
Anyway, removal can increase rpm and speed and increase bow lifting capacity.
Anyway, removal can increase rpm and speed and increase bow lifting capacity.
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Brett Anderson / BBLADES Professional Propellers
920-295-4435 http://www.bblades.com/
[email protected]
Brett Anderson / BBLADES Professional Propellers
920-295-4435 http://www.bblades.com/
[email protected]
#10
Charter Member # 55
Charter Member
The diffuser ring helps the boat get on plane easier. Removing it may help some with rpms and speed, but you are too far off to try and modify what you have. With 600hp a 38 TG should run about 75 mph.