searider 5.4 and e-tec prop advice needed

[yellowmitch]

Hi there. I have an e-tec 90 with the standard 13.25 x 17 prop on a searider 5.4m. The engine is sitting down so as it touches the transom (bottom hole) and the cavitation plate sits just slightly above the bottom of the hull.

I can get 4500rpm with this set up, but would like to get more (namely 5000)

Evinrude suggest this to be the suitable top rpm and so I am wondering should I change the prop, or should I lift thee engine a hole.

I had an accident with my prop today, and so I have to buy a new one PRONTO. (I need it for Tuesday)

What should I buy (size, brand, etc)

What Should I pay?

And finally where do I buy it to have it for Tuesday ?

[PeterR]

I have a brand new one in my garage if you want to buy it could arrange delivery

[PeterR]

Just got it out foryour info its genuine evenrude ali prop 17x14 had it as spare cost 128 pounds you can have for 70.00 plus postage if its any help

[Chris]

Mitch,

Before you lift the engine on the transom I would try a lower pitched prop. I always tend to buy manufacturers props however there are loads of different ones out there, its a bit of a black art getting the right prop for your engine however if you want to get 500 more RPM wich I would say you do then I would start by trying a 13.25x15" a rule of thumb is about 200RPM per inch of pitch.

I have found Aquamarine in Chertsey to hold quite a lot of stock http://www.aquamarineuk.com speak to John. he can advise you of the best bet for you engine.

Chris

Originally Posted by yellowmitch

Hi there. I have an e-tec 90 with the standard 13.25 x 17 prop on a searider 5.4m. The engine is sitting down so as it touches the transom (bottom hole) and the cavitation plate sits just slightly above the bottom of the hull.

I can get 4500rpm with this set up, but would like to get more (namely 5000)

Evinrude suggest this to be the suitable top rpm and so I am wondering should I change the prop, or should I lift thee engine a hole.


What should I buy (size, brand, etc)

What Should I pay?

And finally where do I buy it to have it for Tuesday ?

[Chris]

Try these, got them off the BRP website...

Lisnaskea
Ernecraft Ltd
Derryhurdyn
Brookborough Road
Co Fermanaugh, N. Ireland
BT92 0LD
Tel: +44.28.677.21555
Fax: +44.28.677.21150

www.ernecraft.com
www.isismotorboat.com
Northern Ireland

Sion Mills
Jet Products Ltd
191 Melmount Road
C. Tyrone
BT82 9LA
Tel: +44 28 816 58668

sales@jetproducts.co.uk
www.jetproducts.co.uk
Northern Ireland

Coleraine
Newmills Car and Marine
54 Newmills Road
BT52 2JD
Tel: 02870 343535
Fax: 02870 351431
michael@newmillsmarine.com

Northern Ireland

[Pete7]

Originally Posted by yellowmitch

Hi there. I have an e-tec 90 with the standard 13.25 x 17 prop on a searider 5.4m. The engine is sitting down so as it touches the transom (bottom hole) and the cavitation plate sits just slightly above the bottom of the hull. I can get 4500rpm with this set up, but would like to get more (namely 5000)

I would have thought that 90 hp could turn that prop and reach full revs on an Avon. Are you trimming the engine out when you are on the plane ? and if its got a flooding hull is it emptying properly?

The Evinrude Dealer in Coleraine has a slipway on to the River Bann so he can do speed tests above the weir, which could be useful. Suggest you take the boat along and ask for there help. Always been helpful to me in the past.

Pete

[yellowmitch]

Thanks guys for all the help so far. First prt of call is to try the local dealers and see if they have a standard prop in stock.

Thanks PeterR for the offer of a prop, but unfortunately I think it will be too big.

I have decided that the only two sizes that I am willing to fit are 13.25 x 15 or 13.25 x 17, most likiely the latter as it seemed to work ok on the boat.

I will see what I can turn up locally this morning and if that does not work, then it's royal mail special delivery all the way!!!

p.s. I think my hull is emptying properly because as I go faster the boat DOES become more rolly polly, and when I slow down I can feel it filling.

I reckon standard prop and lift a hole is the best option at the min.

If anyone has any better ideas, please continue to contribute.

P.s. Stainless or alu?

Mitch

[Chris]

Mitch if your cavitation plate is already 1" above the bottom of the transom and you raise it more I think you may start to have cavitation issues.

I own a 5.25 metre Rib with a 11 year old 90 on the back and it is pulling 5300RPM with a 19" prop. So it suprises me you are only getting 4500 RPM on a NEW Etec.

What speed are you getting with a 17" prop at the moment at 4500RPM?

Chris

[yellowmitch]

hitting around 40mph Chris.

Could just be that the engine is not yet fully run in.

Also, when I say 1" above the bottom, I mean the VERY bottom, and it is a sharp V, so to lift another 1" might be safe enough

I think I am going to stick with the standard prop, because I think that stainless is too hard if I hit something.

I am going to the local dealer now to buy another standard prop, unless I can be better advised!

Mitch

[Chris]

Mitch if you are getting 40MPH on a 17" prop I think you will find your RPMs are higher then you think (or the tacho is telling you)

I would check they have set the RPM guage on your dash correctly as there is a small dial on the back to set it for the engine it is being used on.

I think 40MPH on that prop base a 2.1 gearbox ration would be giving around 5,200 RPM

Chris