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Consider buying a 502 for my 242SS

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Old 09-26-2011, 12:08 PM
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Default Consider buying a 502 for my 242SS

Hi All

I am planing to uppgrade my 1988 242 SS

I looking to buy 502 (8,4L) mercruiser MPI 1999

Complitely rebuild and upgraded in 2008, gone 35 hours
since. Somewhere between 500 - 550 HP claimed by
current owner.

Question1:
Will there be space for this engine?? Of course with out the
headers ( see picture)
I think it is allready thight with my 454 standard 330 hp, Do the 502 have the same outside messures??

Question2.
What kind of top speed on a 242 SS with 500 hp ++??

Question3
What kind of price can I get for the existing headers, supose to be in mint condition?? See picture

Regards
Rune
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Old 09-26-2011, 12:56 PM
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Thier will be enough space for the engine, Im not sure about fitment with these headers though. For reference My 242 ls with performance bravo one and 509 c.i. is currently at 68 mph on gps with a 23p standard mirage (non plus) at 5200 rpms. The motor on the dyno made 470 hp and 550 ft lbs of torque. The motor originally made 525 but the builder ended up putting in a smaller cam on rebuild. I should see 70-72 when I get the proping figured out/ tweaked, and maybe a -2 shorty.

Last edited by 86242ls; 09-26-2011 at 01:00 PM.
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Old 09-26-2011, 12:58 PM
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would you be interestred in trading your headers for a set of fully polished emi thunder exhaust?
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Old 09-26-2011, 02:52 PM
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Quote:
Originally Posted by 86242ls View Post
Thier will be enough space for the engine, Im not sure about fitment with these headers though. For reference My 242 ls with performance bravo one and 509 c.i. is currently at 68 mph on gps with a 23p standard mirage (non plus) at 5200 rpms. The motor on the dyno made 470 hp and 550 ft lbs of torque. The motor originally made 525 but the builder ended up putting in a smaller cam on rebuild. I should see 70-72 when I get the proping figured out/ tweaked, and maybe a -2 shorty.
Hi
Thanks for the reply

The engine room in a 242SS and a 242 LS is different , see attach pic. Thats why I am concerned about the space.

A guy I know in Sweden has upgraded his 242LS to a 496 HO Bravo1 1:65 prop bravo1 28 pich. Top end so far 64,8 mph GPS, not to bad. Are the 470 hp messured at the prop? If so I am sure with the correct prop you should see 70mph ++ :-)

Regarding the headers, first I did not buy the engine yet and second I am living in Norway (North Europe). I think we will have a transport/frieight price issue he he
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Old 09-26-2011, 03:09 PM
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I know their is a difference between ls and ss models, still you should have no problem with it fitting, and the hp numbers were at the crank I run a 1.50 ratio drive. Just thought I'd ask about the headers.
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Old 09-26-2011, 04:37 PM
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Engines are the same external dimentions. FYI those headers won't work with your boat. Those are for a boat with an SSM drivetrain. The HP that that engine is putting out will get you close to or at 70 MPH!
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Old 09-26-2011, 05:26 PM
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If I buy the engine the headers will be for sale :-)

Could a Bravo1 1.50 handle 500+ hp??
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Old 09-26-2011, 06:08 PM
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The engine in my 242 is putting out a little over 515hp... The bravo should be fine as long as you don't go WOT when getting on plane.. But I guess it also depends on how healthy your B1 is.. My B1 is only 2 years old, but I only go 60% throttle and the boat still jumps out of the water.. Once I'm on plane and trimmed I will increase the throttle if I want to go faster..

You'll love having a 502 in your boat.. I cruise right around 42 and am at 3900rpms, the engine feels like it's not even breaking a sweat!!


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Old 09-26-2011, 06:55 PM
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Quote:
Originally Posted by AdoubleU View Post
The engine in my 242 is putting out a little over 515hp... The bravo should be fine as long as you don't go WOT when getting on plane.. But I guess it also depends on how healthy your B1 is.. My B1 is only 2 years old, but I only go 60% throttle and the boat still jumps out of the water.. Once I'm on plane and trimmed I will increase the throttle if I want to go faster..

You'll love having a 502 in your boat.. I cruise right around 42 and am at 3900rpms, the engine feels like it's not even breaking a sweat!!

Hi your boat look awsome for the age :-)

I am planing on doing an upgrade on my SS too

What is the speed at around 3-3200 rpm?

Have you tested the top speed yet?

What kind of proppeler do you use?
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Old 09-26-2011, 07:49 PM
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Quote:
Originally Posted by Monaco20 View Post
Hi your boat look awsome for the age :-)

I am planing on doing an upgrade on my SS too

What is the speed at around 3-3200 rpm?

Have you tested the top speed yet?

What kind of proppeler do you use?
Thanks! I wish I could take the credit, but I just bought the boat 3 weeks ago.. The previous owner had it for 10 years. He is a commercial airline pilot so he only works 2-3 days a week.. I'm convinced he spent the rest of the week cleaning, maintaining and upgrading the boat... But anyway, back to you questions..

I have only taken the boat out on the water once... I haven't used it enough yet to figure out where the different sweet spots are. As for the prop, I think it's a 21 4 blade, ss of course. I might change mess around with different props next year...

Sorry I can't be more help!
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