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Old 06-09-2013, 07:51 PM   #1
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Diesel Upgrade on an alpha 1??

Does anyone know a realistic torque figures for an alpha 1?

I am looking to dieselise my 24fter. Cant seem to find any bravo x's for a realistic amount! the boat is about 2 1/2 tonne - but I'm just wanting to potter the coastline at 25knts and not pay for a petrol (as live on a farm... )

So far im thinking of an Isuzu trooper engine, a volvo d5 (2005 on as it has watercooled turbo - bonus!)

Or... the dreaded 1.7 merc that apparently used the alpha 1 as standard.

Custom parts are no issue (or can cheat with D5 as the penta D3 is exactly the same)

I know a lot of people say it is cheaper to buy a diesel boat complete, but i can get these engines very cheap (opposed to £22k for a new D3 Penta )
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Old 18-09-2013, 08:55 AM   #2
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Can handle 550 NM with a dual mass flywheel
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Old 18-09-2013, 09:01 AM   #3
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So is it the peaks of torque that will kill it? I take it if i could find a nice v8, then it could handle a bit more?

Interesting tho, I have not thought of a dual mass!

Has anyone seen this engine, whether its a good one to get? ebay item no. 200961215593

Thanks!

Will
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Old 19-09-2013, 10:25 AM   #4
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On low rpm levels the peaks by cilinder firing gives a rattle of the tooths on the upper unit and damaged the gears on longer time.
So a dual mass flywheel is the solution.
On short times it can handle more torque, we did 700 NM (BMW 535d) but we have not tested that for longer time.
tuned 530d gives no problem, see dyno sheet
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File Type: pdf Test 530d.pdf (14.9 KB, 78 views)
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Old 19-09-2013, 12:59 PM   #5
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Thanks mate, worth a serious look into!

Probably go down this route, as long as theres a mechanical pump type as not so keen on ECU and water

Many thanks
Will
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Old 19-09-2013, 01:25 PM   #6
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The truc is to bring it not together :-)

I prefer a engine with electronics that can handle the boating conditions than a old indirect injection engine on that ebay aventorial.
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Old 19-10-2013, 06:24 PM   #7
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What can an Alpha 1 Gen 2 Take HP diesel

If you work on And Alpha 1 Gen 2 It can handle. 150 hp diesel At 4000 rpm With a shower on it I am running mr Drives And I am putting 110 Hp Through Them And have been running for two years With no problems And mr Drive Is not as strong I have LanRover 300 TDI And my boat 28 feet 4 1/2 tons And Does 20 knots With 2 300 TDI Hope this answers your question
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Old 21-10-2013, 08:29 AM   #8
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Hi Sam1cats

Im at a point where if i under-power the boat, i will kick myself for seasons to come! i have only got room for one engine, so im going to make it the biggest i can put in! sounds very interesrting with your tdi300, seriously bullet proof..!

Just need a new braxo x drive!

Thanks mate
Will
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Old 22-10-2013, 10:15 PM   #9
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Found a Bravo 3X drive in my price range.. finally!

I saw this post on another forum, does this make sence? Thinking of doing the same as i have access to a mill, reams ect!

http://forums.iboats.com/mercruiser-...ve-562089.html

Im definately going to match the two up and see if it actually will work - has anyone got any experience doing this?

Cheers
Will
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Old 23-10-2013, 11:41 AM   #10
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The cost of a Bravo bellhousing (helmet) is around £800+ alone, so this, plus the value of your current Alpha Transom, would be close to the cost of a brand new Bravo 1 Transom Assembly, with a years warranty!
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Old 23-10-2013, 11:57 AM   #11
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Hi Mate

can you price me for a bravo transom assembly then?

Im all up for making changes ect but if its going to be more cost effective to get the proper parts then ill take that route. Would you consider a PX?

Cheers
Will
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Old 24-10-2013, 02:32 PM   #12
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I'll sort out a price for you later today.

P/X, probably not!!!!
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Old 02-11-2013, 09:14 PM   #13
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Bravo Drives

I got a couple of 3x drives complete with transom asembly if your still looking.
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Old 04-11-2013, 09:07 AM   #14
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Hi Mate

I would have been 2 weeks ago.. typical! haha I should be sorted for the time being, I will give you a shout if not!

Cheers
Will
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