Any Gearhead's? - SailNet Community
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post #1 of 41 Old 11-11-2008 Thread Starter
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Any Gearhead's?

Just wondering if anyone had added a belt driven supercharger setup on a perkins 4-108? I have the space, and I have already made an intercooler. I run 490 compression, and I set the injectors at 250 BAR, more air, more boom!, less fuel.
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post #2 of 41 Old 11-12-2008
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Craziness... Haven't seen a supercharger on a small diesel. Hope you got room for a bigger wheel. You going to go with a stack? Black smoke all the way out of the marina? Post some pics when you are done!

I remember looking at some boats that had a marinized version of the Volkswagen 1.6L diesel. I have wondered if it would be possible to maranize the later VW turbo diesel that they put in the late 80's Golf's.
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post #3 of 41 Old 11-12-2008
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I have no direct experience of supercharging, but a mate of mine was at one time into adding blowers to his old cars and I remember some spectacular results, sometimes including flying pistons!

I have briefly looked into the possibility as a cheaper way of getting more power, but it actually looked mighty expensive to me.....

I would be really interested to know how it goes. My memory (not necessarily to be relied on these days) is that the installation process was reasonably straightforward.

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post #4 of 41 Old 11-12-2008
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Why would you want to add that kind of complexity to a marine diesel that hopefully isn't used all that much??? It is a sailboat you have, right???

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post #5 of 41 Old 11-12-2008
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No, i have not seen anyone put a superchager on sailboat. But, I put one of these on my boat to blow across the sails. Works great, I gained 112 knots. The only draw back so far is I go through a lot of sails.


Last edited by bubb2; 11-12-2008 at 09:28 AM.
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post #6 of 41 Old 11-12-2008
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Oooooo! Neat. Bolting that on the bimini I would likely reduce my motoring time from five minutes to 37 seconds to get out of the slip and out on the water!

Wonder if I could get the sails up while the hull was still skipping?

Probably lose a lot more hats, too.

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post #7 of 41 Old 11-12-2008
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Cap :
Be careful.
The motor does breathe in very hot air with a supercharger, or turbocharger, hence the need for your intercooler.
They don't make the easiest of bolt-on devices.
Spare a thought for the motor.... it wants to breathe cold, and will probably detest the hot intake air.
If it is a sailboat, it probably won't need the extra power and certainly won't need the uncertainties of the new set-up.
Pls be careful.
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post #8 of 41 Old 11-12-2008
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After drag racing cars for years, I would not complicate a proven system that's only purpose was to get you in and out of a slip. I just don't see the benefit for added cost, wear and tear on the engine, and more fuel used. How do you plan on tuning this engine?
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post #9 of 41 Old 11-12-2008
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Good idea, but I know of three folks that recently had to replace older turbo motors, ALL went with an equal HP non turbo version. It might have been cost, but mostly it seems with motors used in boats, the turbo/supercharged motors are not as long lived, or reliable. I have a mini trackhoe with a 15hp turbo motor, the next later model went with a non turbo 16Hp motor. No issues with that yanmar as of yet, hopefully not with 1500 or there abouts hrs on it.

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post #10 of 41 Old 11-12-2008
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Also, if you go with this project any way, many non turbo designed diesels have about 21 to 21-1 compression vs turbo version with 17 to 18-1 compression. So do not boost to more than about 12psi or you WILL hurt the motor, vs lower compression motors you can get into the 20 even 30 lbs of boost, but you will see lots of black smoke behind you!

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