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Old 07-15-2009, 08:58 PM   #1
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Default 2008 1800 SR3

I want to get a better prop on my 2008 1800 SR3 4.3 TKS than the stock 14" 23P 3 blade aluminum that came stock. I see a lot of people recommending a High Five with a 21P. What diameter would that be? I am trying to get better hole shot and minimizing the bow rise. Any recomendations?
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Old 07-16-2009, 01:48 PM   #2
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Default Re: 2008 1800 SR3

The 2008 1800 SR3 4.3L came in a 190HP and 220 HP configuration. The 220HP version came in a MPI version, while I belive the 190HP is Carburated. The gear ratio of the outdrive is going to impact this as well. I beleive your model has an Alpha I outdrive which came in 1.62; 1.81; & 2.0 gear ratio's. You'll need this along with the total weight of the boat and gear and people which are most frequently on the boat. Elevation above seas level will impact this number as well.

I would think that you would need to go down in pitch to increase your hole shot. Where are you at Max RPM's? Are you within the recommended range for the motor? If you can't reach the max RPM's, then a smaller pitched prop will increase max RPM's. You don't want to be able to exceed your MAx RPM's if you can avoid it, as this would indicate you're UNDER propped. Not being able to reach Max RPM's would typically indicate you're overpropped.

In your case, you'd be changing from a 3 blade to a 5 blade which is going to add an additional level of complexity. I would take the time to speak with Mercury about this.

Here are some resource links which may be helpful:

http://sites.mercurymarine.com/portal/p ... ema=PORTAL

The site includes a Prop Calculator as well as contact info.

Here is the link to the Mercury Prop Calculator:

http://sites.mercurymarine.com/portal/p ... ema=PORTAL

Here is another generic Prop Calculator:

http://www.propline.com/Select-Boat-Pro ... s/main.htm
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Old 07-16-2009, 04:16 PM   #3
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Default Re: 2008 1800 SR3

Quote:
Originally Posted by Rynorito
I want to get a better prop on my 2008 1800 SR3 4.3 TKS than the stock 14" 23P 3 blade aluminum that came stock. I see a lot of people recommending a High Five with a 21P. What diameter would that be? I am trying to get better hole shot and minimizing the bow rise. Any recomendations?
I run an 1880 SR3 (2007)
The 21" is the ideal choice ... I think it's about 13.5" ... you don't have diameter choice anyway, it is what it is.

It will give better holeshot, but it won't do much for appalling bow rise on this hull.

Read my post on fitting Smart Tabs ... fitted them to my boat and it handles like a totally different hull .... best investment you can make - and very easy to fit.
http://maxumownersclub.com/forum/viewto ... f=1&t=1203
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Old 07-18-2009, 12:43 AM   #4
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Default Re: 2008 1800 SR3

I installed the smart tabs on my 1800 SR3. Huge difference, bow rise is less and the boat planes at a lower speed. Very glad I put them on the boat.
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Old 07-27-2009, 05:57 PM   #5
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Default Re: 2008 1800 SR3

For those who have a High Five 21P on the 1800 SR3 what is your WOT RPM's? Does anyone have the 23P High Five?
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