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Old 28-09-2008, 09:40 AM   #1
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Advantage of twins on a puma?

Everyone i've spoken to about my new puma has told me to put it back to twins... I had a good look at the conversion to a single motor yesterday, the glassing is a mess and the bolts holding it on have washers made from chequer plate that sit at an angle to the transom on the inside, so are diggging in.

Knowing the abuse it'll get from the seas over here, i've got 2 options. Re-make this bit with much more strength, or just re-rig her with twins

Firstly, would anyone have any close pics of the twins setup on hospitality inns (thistle hotels)? The old bolt holes are in place, but the hull shape has changed a lot, i'd like to be able to see exactly how it was back then!

What kind of advantages will i see from running twins? So far i've been told i'll get more stability and better speed, hoping for 90's.

Last but not least, i'm not on a big budget here, infact i've only just got a budget at all... What motors should i be looking to get?
I'm thinking xr2's... they're not my favourite engine, but they're cheap at the mo and parts should be easy to find!

I'm hoping to get a pair of whatever for the same price as my (mariner branded) 300 promax which is immaculate. If someone's got something, or even better would be interested in a swap, send me a pm!

Basically i'd like to get her running as well as possible without spending too much, i do have a baby on the way!

Any advice would be great

Cheers, James
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Old 28-09-2008, 11:24 AM   #2
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Twin setup would be best because that is what the boat was designed and built to have, I would imagine the strength would be built for either side of the Transom rather than the middle, Best PM Hutchy who had your boat with a twin set up or Gav who i believe put the top deck on, maybe for the photos.

Scand or Adam here could be contacts on what options are open as they both design


gaZ
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Old 28-09-2008, 11:30 AM   #3
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cheers for that gaz, from looking at the stern as it is now i think my only option will be to bolt them straight to the back with a small spacer. Due to the new top half i can't have anything forward of the boltholes (imagine the transom carrying on straight up in front of the engine).

I've spoken to steve h on here, he's the one that's really got me thinking about twins. The way i look at it, it'll probably be cheaper to put on a set of xr2's if i can get a pair with steering, rather than strenghtening the centre for the single and still having to get steering!

I don't think i'll go for lifters or anything to start with, it didn't have them when it raced so i may as well keep things simple and cheap!

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Old 28-09-2008, 11:56 AM   #4
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hutchy put the deck on himself, gav just supplied it
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Old 28-09-2008, 12:05 PM   #5
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Ran 110 with 260s as per this thread.

http://www.boatmad.com/forum/showthr...highlight=puma


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Old 28-09-2008, 02:36 PM   #6
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thats tempting but...

I doubt i'll get a pair of 2.5's for the same kinda price as a 300x and a gorilla lifter

JF himself said the he sh*t his pants at that kinda speed so xr2's should do me fine

Ideal motors for me would be a pair of 2.5 carb motors, doubt i'll get them either tho!
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Old 29-09-2008, 10:50 AM   #7
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Alright larby!

Good to hear you've got your new boat, we were out in Charlies yesterday, was perfect weather round the back of herm with the biscuit! Feeling it in my arms today though!!

Just noticed you are thinking of an engine change! Whats the score with your 300? May be interested if it was comming up for sale... or would it be a very bad idea on the back of an R21??
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Old 29-09-2008, 12:50 PM   #8
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thats tempting but...

I doubt i'll get a pair of 2.5's for the same kinda price as a 300x and a gorilla lifter

JF himself said the he sh*t his pants at that kinda speed so xr2's should do me fine

Ideal motors for me would be a pair of 2.5 carb motors, doubt i'll get them either tho!
Taz had a pair of XR2's for sale not long ago.
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Old 29-09-2008, 08:30 PM   #9
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Mike, I'm in discussion with taz at the moment, hoping to strike a deal there... he's away at the mo.

Andy, PM me your mobile number, i'm sure many on here would agree the ring would be more than capable of taking the 300, and it's got the right length leg too!

Cheers, James
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Old 14-10-2008, 06:11 AM   #10
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I have a pair of 2005 Merc 15" 280 ROS motor with fresh rebuilds for $26,000 US dollars for both, and a pair of 1999 300 Promaxs, $18,000 for the pair.

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Old 14-10-2008, 07:35 AM   #11
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Both of which I'd sell my gran for, but could still never afford

Cheers for the offer though, had seen them on S&F too...

James
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Old 14-10-2008, 09:12 AM   #12
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Xr2's are more than likely going to push your puma way past a speed your able to comfortably maintain plus they are light and they are the engine I think the boat was designed for and dont mention the fact there are 1 million Xr2's for sale in the UK and finding a pair for 4k-5k or even less isnt going to be a problem.
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Old 14-10-2008, 05:16 PM   #13
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I've got my eye on a pair of Yam 225's at the mo that i can get a really, really good deal on. I know they're heavier but the extra power should make up for that. I'd personally trust the reliability of the yams more than xr2's, especially seeing as they've only done very few hours.
Main deciding factor is the price though, £5k is way too much, especially considering i need to still buy steering, and get the engines shipped... The yams are local

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Old 14-10-2008, 06:14 PM   #14
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Both of which I'd sell my gran for, but could still never afford

Cheers for the offer though, had seen them on S&F too...

James
Tell us more about this gran. Is she fit?
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Old 14-10-2008, 08:22 PM   #15
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Tell us more about this gran. Is she fit?
You "OLD CHARMER" Is that a pair of 225 yams in your pocket or has your Truss Slipped - Again
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Old 14-10-2008, 09:15 PM   #16
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I was taking to someone about this boat at drivers. And I think weight is an issue. The extra weight of the yams my not be the best way to go.
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Old 14-10-2008, 09:36 PM   #17
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I'm sure the Yams are about 245 Kg each and the Mercs are 193kg def.
104kg's extra for the pair, would the 2.5 Merc's EFI's not put more load on the transom because of the higher power although weighing less?
Mr Rob, What do you think?



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Old 15-10-2008, 09:00 AM   #18
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Tell us more about this gran. Is she fit?
Nah, she gets out of breath just walking across the lounge....
That is what you meant isn't it??

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I'm sure the Yams are about 245 Kg each and the Mercs are 193kg def.
104kg's extra for the pair, would the 2.5 Merc's EFI's not put more load on the transom because of the higher power although weighing less?
Mr Rob, What do you think?

gaZ
Cheers for all the feedback guys, I'd rather go through it all now than after i've bought a pair!
Steve H mentioned that she could easily be upset by too much weight in the back as she was built so light... That said, so far i've removed over 150kg of 2x4 and other assorted kinds of wood, including 2 fence posts from the back which should help with that!
She also had the fuel tanks moved forwards to balance her when she did the 111mph run, so this should help with balance for the heavier motors?

What would be the effects of her being a little stern heavy? Is there anything else i can do to counteract this?

Cheers, James
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Old 15-10-2008, 11:28 AM   #19
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I'm sure the Yams are about 245 Kg each and the Mercs are 193kg def.
gaZ
Over the years I had collect a few Merc XR2 pamphlets showing their spec sheets and they showed weight at 159KG considerably lighter than Yams
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Old 15-10-2008, 08:08 PM   #20
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I was only going on a 2.4 merc 200 weight.
2.5 EFI 170kg
2.5 200 179kg

gaZ
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