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 Post subject: Re: 1800 Class Engines
PostPosted: 16 Jun 2013, 19:28 
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4.8


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 Post subject: Re: 1800 Class Engines
PostPosted: 16 Jun 2013, 19:38 
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Joined: 28 Mar 2008, 18:51
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Location: Melbourne - Gippsland?
APBA 2012 - 2013 Rule book.

1202.02 Hull length - A limit applies to the motor capacity permitted to be fitted to a given length of Boat as
follows:
Up to 550cc Unrestricted length 1251cc to 1800cc 4.0 metres
551cc to 800cc 3.35 metres 1801cc to 2100cc 4.8 metres
801cc to 1250cc 3.50 metres Over 2100cc 5.0 metres
Any engine above 220kg 5.5 metres
1202.03 The Boat length must be measured between perpendiculars at the extreme bow and stern.
- 62 -
1203.04 The bow is the forward most point of the Boat meeting the main deck.
1203.05 The stern is the transom joining the extremities of the Boat and to which the motor is attached.
1202.06 Any extending parts, rubbing strakes, fenders, stabilising and trim fins are not included in the length
measurement.
1202.07 Trim tabs, after planes and directional fins are permitted.

Hope that helps Gary. So reading this, with his 1802CC motor, his boat would have to be a minimum of 4.8 metres. Thanks Gilli.


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 Post subject: Re: 1800 Class Engines
PostPosted: 16 Jun 2013, 19:45 
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Location: Melbourne - Gippsland?
Which poses another problem and probably needs to be addressed with the National Rule changes.

Your motor is right on 1800cc's from the factory on it's original bore. So you rebuild it, new oversized pistons which are allowable under the new rules for next season. But now you are over 1801 cc's. So now you need a bigger boat, or a dodgy tape measure!

Or step up into the next class.


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 Post subject: Re: 1800 Class Engines
PostPosted: 17 Jun 2013, 16:55 
Thanks for all the info. From memory the boat measured somewhere over 16' (so more than 4.8m) so this shouldn't be an issue.

I was looking at what the options would be for an engine to fit. Nigel you might be right, the more I think about it the in line 6 Merc may be my simplest option. Probably won't break any records, but just would like to get it on the water again and have some fun.
I used to run a 6 litre ski-race boat many moons ago, no were near the fastest boat, but had a ball.

Back in OZ early August, so will try to get along to a club meeting after that. Is there one in August?


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 Post subject: Re: 1800 Class Engines
PostPosted: 17 Jun 2013, 21:23 
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Location: Melbourne - Gippsland?
Meetings are the 2nd Wed of every month at the Water Sports Centre at Carrum. Look forward to seeing you there.


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 Post subject: Re: 1800 Class Engines
PostPosted: 18 Jun 2013, 20:04 
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It is the combined Inboard and Outboard Australian Titles. Oops, sorry, that is wrong.

It should be The combined Outboard and Inboard Titles. All classes will be catered for as long as enough entries are received to constitute a class. So if the class is in the rule book, enter.

The NSW Council of the APBA are running this event.


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 Post subject: Re: 1800 Class Engines
PostPosted: 18 Jun 2013, 20:54 
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Not quite Woody! Its not a club day. I think you will find that Australian Titles need to be applied for and ratified at the National AGM by the applying club/state council. Once this is done, the conducting club/state council will ask for entries and only then will it require a minimum of four bona fide entries 14 days prior to the race date. That said, has the NSW state council distributed a proposed list of classes that they intend to run? :beer


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 Post subject: Re: 1800 Class Engines
PostPosted: 15 Jul 2013, 17:34 
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So I hear that the OEM oversize rule has now been thrown out?

Those that are thinking of running a 85/87 OMC Looper need to make sure all four bores are standard.

Bore - 3.500 inch / 8.8899999865cm (divided by 2 for radius 'r' = 4.44499999325cm) rounded up to 2 decimal places = 4.44cm
Stroke - 2.858 inch / 7.25931989cm rounded up to 2 decimal places = 7.26cm

Calculation of cylinder capacity Pi x r2 x stroke (calculations all done on scientific calculator)

Pi (3.141592653589793) x 4.44sq x 7.26 = 449.63cm3

Therefore;

1985/87 V4 OMC Looper = 449.63cm x 4 cylnders = 1798.51cm3/cc
1985/87 V6 OMC Looper = 449.63cm x 6 cilynders = 2697.76cm3/cc


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