Best Engine Choice for 5.4 Searider?

[DM]

Originally Posted by willk

60 hp equivalent is yer lot.

In my experience, that rule of thumb argument about twins being the lesser of the whole doesn't always pan out.

Having said that, Yam/Tohatsu 90 everytime for a 5.4. Mid mount the tanks and a 115 V4 does the business.

[DM]

Originally Posted by willk

There's no contest, performance wise.

Osprey Viper 5.2 with single 100hp = 35 knots

Osprey Viper 5.2 with 2 x 60 = 38 knots

You're right, no contest.

[chewy]

Originally Posted by Pikey Dave

Chewy, oxymoron

Your never from Yorkshire using words with an "x" in!

[willk]

Originally Posted by chewy

Your never from Yorkshire using words with an "x" in!

YorXire!

[Downhilldai]

Originally Posted by chewy

Some SR5.4's were rated to 115hp.....

Only JSP's



......and that was what JSP rated it at, 'cos someone had fitted a 115 to it before he bought it.


Here's another thought:
Soozook DT90: not many of them around, but if you could find one, it would be a super motor on a SR5.4. It's a 60 deg V4, 1.5 litre, good on juice and bags of grunt. Basically a de-tuned DT100, produced in the mid to late '90s to replace the ageing DT85, before Soozook went all 4-stroke on us.

There again, you could go for a Twatsoo TLDi, Opti or E-tec, if you want a modern 90hp 2-stroke. The new(ish) Soozook DF90 is relatively light if you want a 4-stroke.

Now, have I left anything out?

[colcreate]

Thanks DM, one vote for the twins then!
I wonder what insurers would say about overpowering a SR with the 115hp I know it's often done but could it be a problem?
Has anybody got true performance figures for a Yam90 5.4?

[Pikey Dave]

Originally Posted by DM

Osprey Viper 5.2 with single 100hp = 35 knots

Osprey Viper 5.2 with 2 x 60 = 38 knots

You're right, no contest.

how did other factors compare? Holeshot, planing speed, time to plane, WOT etc, it's not always about top end

[chewy]

Originally Posted by Downhilldai

Only JSP's



......and that was what JSP rated it at, 'cos someone had fitted a 115 to it before he bought it.

Lol, theys a pic kicking about of an SR5.4 with a CE plate rated to 115hp.

[Downhilldai]

Originally Posted by chewy

Lol, theys a pic kicking about of an SR5.4 with a CE plate rated to 115hp.

What boat was the CE plate fitted to originally?

[chewy]

Originally Posted by Downhilldai

What boat was the CE plate fitted to originally?

Well it had Avon and Searider 5.4m stamped on it....

[DM]

Originally Posted by Pikey Dave

how did other factors compare? Holeshot, planing speed, time to plane

Dunno. I've never owned a watch.

Originally Posted by Pikey Dave

it's not always about top end

No, it's not and it's not always about redundancy and manouvrebility either. Twins give better low down torque but more important in a small boat, better lateral stability.

[Downhilldai]

Originally Posted by chewy

Well it had Avon and Searider 5.4m stamped on it....

A bit of 'trick photography' by JSP

[DM]

Originally Posted by Downhilldai

......and that was what JSP rated it at

Being a welsh person, I thought you would know that the 5.4 was originally rated at 115 til some one who shall remain nameless blew the transom off one by fitting a Yam 130 V4 so the 115 was a compromise

[colcreate]

OK exploring options here, what are a matched pair of Mariner 40 longshafts worth Elec and manual start, oil injection complete with all cables and controls. Exceptionally tidy condition, been in storage for years.

[Downhilldai]

Originally Posted by DM

Being a welsh person, I thought you would know that the 5.4 was originally rated at 115 til some one who shall remain nameless blew the transom off one by fitting a Yam 130 V4 so the 115 was a compromise

Was that the prototype model, before fibreglass was invented?

[DM]

Originally Posted by Downhilldai

Was that the prototype model, before fibreglass was invented?

Silly boy. It was one of Wales finest.

ps Have you measured your 4.7

[chewy]

Originally Posted by Downhilldai

Was that the prototype model, before fibreglass was invented?

Had a CE plate on so would have been a production model?
DM I owe you a pint, come to think of it theys still a bottle waiting here for you from my favoutrite Welshman.

[Downhilldai]

Originally Posted by colcreate

OK exploring options here, what are a matched pair of Mariner 40 longshafts worth Elec and manual start, oil injection complete with all cables and controls. Exceptionally tidy condition, been in storage for years.

I'd say around £600 - £700 each. Would suit an SR4 nicely and there's always guys resurrecting them.

The market for selling them as a pair would be limited.

[Pikey Dave]

Osprey Viper 5.2 with single 100hp = 35 knots

Osprey Viper 5.2 with 2 x 60 = 38 knots

You're right, no contest.

Originally Posted by DM

Dunno. I've never owned a watch.



No, it's not and it's not always about redundancy and manouvrebility either. Twins give better low down torque but more important in a small boat, better lateral stability.

I agree, but you didn't mention that initially, you highlighted the top end performance difference

[Downhilldai]

Originally Posted by DM

ps Have you measured your 4.7

Could I borrow your tape? I quite fancy owning an SR5.1