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 Post subject: Supercharged LD28s
Post Number:#1  PostPosted: Wed Sep 27, 2006 8:00 pm 
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Joined: Wed Sep 27, 2006 7:50 pm
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Location: NEW ZEALAND
I run twin supercharged LD28s approx 120 hp each thru alpha 1 mercruiser stern legs on my 30 ft 5.5 ton fibreglass boat they rev out to 3800 rpm with the props set at 14 in pitch and give a top speed of 17 knots, should I adjust the pitch up to bring the revs back [propulse adjustable props] and keep the speed or would this possibly work the engines to hard spinning bigger pitch props,normal cruising speed is 12 knots at 2800rpm using about 20 litres an hour

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Post Number:#2  PostPosted: Sun Nov 12, 2006 11:31 pm 
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Joined: Sun Nov 12, 2006 11:22 pm
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Location: New Zealand
Hi, I don't have an answer for your question but am looking at putting LD28's in a 8meter shark cat I have. Wondering how you supercharged the ones you have and also is your 20 ltrs an hour per engine or total fuel consumption. Thanks.


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Post Number:#3  PostPosted: Tue Nov 14, 2006 9:55 am 
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Location: NEW ZEALAND
My engines were supercharged when I got the boat,The guy I bought it off did the job maybe you could try him,His name is Greg Surgenor his business is Rimu Engineering in Blenheim,he has a website but you will have to google it as im not sure of the address,fuel usage at 2800rpm is about 20-25lts an hour combined giving me cruise speed of 12kts but at 3500 rpm speed is 18kts and fuel is about 20-25 lts per side so about 40lts an hour thats with the props set at 15 inch pitch,Ive tried the props at 17 in but that just cut my revs back and only gave me top speed of 13kts at 3000rpm which was all the engines could pull.hope this helps

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Post Number:#4  PostPosted: Thu Nov 16, 2006 8:43 am 
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Joined: Mon Nov 28, 2005 5:01 pm
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Location: Des Moines, Iowa
Any possibility of getting to see pictures of the supercharger install?

thanks

sa

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Post Number:#5  PostPosted: Sat Dec 28, 2013 5:15 pm 
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Location: Iceland
I know this is a long time dead post but, is there any change I could a pic if that supercharge setup?


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Post Number:#6  PostPosted: Sat Jan 11, 2014 9:02 pm 
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Joined: Sat Nov 26, 2005 7:28 am
Posts: 5286
Location: Duvall, Wash.
I'm reasonably sure that when the OP says supercharger, he means turbosupercharger (ie turbo).

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1982 Maxima diesel wagon, 2nd & 4th owner, 165k miles, rusty & burgundy/grey. Purchased 1996, SOLD 16Feb10
1983 Maxima diesel wagon, 199k miles, rusty, light yellow/light brown. SOLD 14Jul07
1981 720 SD22 (scrapped 04Sep07)
1983 Sentra CD17, 255k, bought 06Jul08, gave it away 22Jun10.


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 Post subject: Re: Supercharged LD28s
Post Number:#7  PostPosted: Tue May 03, 2016 4:31 pm 
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I believe that the original post is correct as I have just perched a 30ft boat with twin ld28 born are supercharged


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 Post subject: Re: Supercharged LD28s
Post Number:#8  PostPosted: Wed May 04, 2016 3:54 am 
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Joined: Sat Nov 26, 2005 7:28 am
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Location: Duvall, Wash.
Yup, Thanks for that picture. I'd never heard or seen a supercharged LD28 before today.

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Al S.

1982 Maxima diesel wagon, 2nd & 4th owner, 165k miles, rusty & burgundy/grey. Purchased 1996, SOLD 16Feb10
1983 Maxima diesel wagon, 199k miles, rusty, light yellow/light brown. SOLD 14Jul07
1981 720 SD22 (scrapped 04Sep07)
1983 Sentra CD17, 255k, bought 06Jul08, gave it away 22Jun10.


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 Post subject: Re: Supercharged LD28s
Post Number:#9  PostPosted: Sat May 14, 2016 6:30 am 
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Joined: Tue May 03, 2016 2:08 am
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both run one supercharger needs work but it runs sounds mean bit smoky as first time thay have ben run in 2-3 years will try upload a video


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