5.2m Kevlacat Re-Powering

[couldbe]

Gents,

I am looking at a 1999, 5.2m Kevlacat with Yamaha 70's. I think that they have a little life left on them but was wondering the options of repowering to a HPDI 2 Stroke or a 4 Strokes. I know that the 5.2m KC is rated to 90Hp so I did some research on engine HP and engine weights. The following is what I found.

119 Kg60 HPYamaha High thrust4 Stroke25' Leg120 Kg60 HPmercury big foot4 Stroke25' Leg122 Kg90 HPyamaha 2 stroke2 Stroke125 Kg90 HPyamaha 90's 2 strokes2 Stroke138 Kg90 HPmerc 2 stroke2 Stroke148 Kg90 HPevrinrude E-techsHPDI25' Leg162 Kg60 HPsuzuki4 Stroke165 Kg90 HPhonda 4's 75 and 904 Stroke170 Kg90 HPMercury OptimaxHPDI172 Kg80 HPyamaha 4 Stroke181 Kg90 HPmercury 4 Stroke193 Kg90 HPsuzuki4 Stroke

From what I can see the heaviest 90HP 2 stoke (theoretically the max weight allowed) was the 90HP Merc at 138KG. Based on this logic does this mean that an Evrinrude E-Tec 90 Hp at 148KG would be OK?

Can anyone give me some information as to the best way to repower a 5.2m KC and are the engine pods the limiting factor for weight? Are all the old 5.2m in the same situation or are some suited for more weight than others?

Thanks heaps in advance.

Daniel

[finding_time]

Daniel

Mines been repowered with yamaha high thust 60 4strokes ! Top speed seems to be 30 knots with my cruise at 23-24 knots at 4600rpm i'm using 20-22l per hour at this speed and the boat goes very well. I'm not sure of the fuel capasity of the later models but if i was repowering i would go with a similar motor as any bigger i start loosing range and to me range is very important!! Sometimes i think people get sucked into larger motors ( it the nature of the male race to want bigger and faster) but i dont know if there needed in this case the high thrust 60 4 strokes seem to be a very good match.

Ian

[rat_catcher]

I'm not sure of the fuel capasity of the later models but if i was repowering i would go with a similar motor as any bigger i start loosing range and to me range is very important!!

Ian - What is the fuel capacity of your rig? And is this in two tanks and are they plumbed separately?

[Grunter71]

Ian

Another question for you. Is that 20 - 22 litres/hour at cruise speed for both motors?

[finding_time]

Each side has 110 litres so 220 litres for the boat and there separate systems one tank feeds one motor.

Each side is using between 10 and 11 litres per hour at cruise of between 22-24 knots so 22 per hour for the boat.

Giving me a range of about 200nm or360 km's before the need to carry extra.

These figures are bassed over the last 60 hours of use


Ian


Couldbe


Pm Kittycat( wayne) he knows alot more about the KC than me. He runs 75 honda 4 strokes on his and is getting about 1 km to the litre as oposed to my 1.4-1.6 to the liter i'm getting. This could be due to the larger motors and also the fact that he drives a little harder than me I'm a bit soft

Ian

[Kerry]

ian,

Where did the 90hp max figure come from? Is this for the original 5.2 or the new 5.2?

The original 5.2 is basically limited in engine weight by the pods.

Do not see any reason to want to go to 90's, does really serve no purpose on a 5.2?

Regards, Kerry.

[finding_time]

ian,

Where did the 90hp max figure come from? Is this for the original 5.2 or the new 5.2?

The original 5.2 is basically limited in engine weight by the pods.

Do not see any reason to want to go to 90's, does really serve no purpose on a 5.2?

Regards, Kerry.

Kerry


I agree with you regards the 90's to big! It was Daniel that mentioned them he's looking at a 1999model and maybe these have a 90 limit? I think the earlier ones like mine have a 70 or 75 limit, i'm very happy with the 60 4 strokes.

Ian

[Kerry]

The "old" 5.2 (2000) as far as I am aware existed in original form from the late 80 until discontinued sometime in early 2000 and something?

The "new" 5.2 has been reborn as a 1900 only in the past few years.

Towards the end of life of the 5.2 the 5.8 (2100) was made and this one was specifically designed from the ground up for heavier engines (a la 4S's)

So this is why I ask where the 90HP max came from with regard a 1999 5.2 as this would have to be the original 5.2 (2000) hull?

The original spec for the 5.2 was 70HP max but I have seen a 5.2 with 90 mercs but really they didn't do anything more than the 75's they replaced.

Maybe I've lost track of time?

Regards, Kerry.

[Kerry]

Each side has 110 litres so ... Ian

Ian, Have you ever filled these tanks from scratch, from bone dry?

Just curious if they are actually 110 litres (25 gall) or not?

The so called 40 gall tanks which should be 180 litres are only 160 litres, which has made me think the volume is quoted on external tank dimensions and not internal volume?

Regards, Kerry.

[finding_time]

Kerry

was unsure of this my self so tried to run them dry , there was still a fraction in ( using dip stick) but we managed to put in 105l so there probably 110 maybe just a fraction more if you include the filler hose volume

Ian

[mirage]

Daniel, everyone I have heard of has re-engined with the 60hp high thrust 4stk Yamaha and have been very happy with them. See this post from Fly_1 for some more actual figures http://www.ausfish.com.au/vforum/showthread.php?t=67347

[finding_time]

Mirage

Thanks for reposting that link as i have looked for it before!!!

[Lovey80]

Coulbe, I really wish i was in your position.

Cheers Chris

[couldbe]

Thanks for all the info so far. I think that Kerry might be right I may have assumed that the max horsepower for the 5.2m was 90HP when it might be something less. Does anyone know what the max HP and weight is for a 1999, 5.2KC.

I am happy to go with the 60HP Yamaha High Thrusts and got a quote for $8100 for each + installation but just want to explore my options first. The reason I was asking about the extra HP in 90's was that i do a lot of extended crusising around the Barrier Reef and the extra speed would be useful. Can anyone recommend a place to get the motors from in Brissy?

Cheers
Daniel

[couldbe]

Thanks for all the info so far. I think that Kerry might be right I may have assumed that the max horsepower for the 5.2m was 90HP when it might be something less. Does anyone know what the max HP and weight is for a 1999, 5.2KC.

I am happy to go with the 60HP Yamaha High Thrusts and got a quote for $8100 for each + installation but just want to explore my options first. The reason I was asking about the extra HP in 90's was that i do a lot of extended crusising around the Barrier Reef and the extra speed would be useful. Can anyone recommend a place to get the motors from in Brissy?

Cheers
Daniel