Exhaust

[Leedo Lanes]

Hey, anyone have any Persuader S.S. exhaust tips for sale. Or, perhaps know where to get some?? I want a pair for my Sportfire...

[Leedo Lanes]

Hey, anyone have any Persuader S.S. exhaust tips for sale. Or, perhaps know where to get some?? I want a pair for my Sportfire...

[jrumon]

Leedo... Any of the marine suppliers have them...gill, rex marine, eddie marine, teague custom marine, stainless marine, etc. The Stainless steel ones run about $150-200 a pair. The older cast aluminum style with rubber flappers run about $100-130 a pair. You will also need to purchase the correct outdrive exhaust block off plates (Merc or OMC) when converting to thru-hull set-up. You will also need the correctly rated rubber exhaust hose to hook the tips to you manifolds (the same suppliers sell it too).

Just a word of caution...if your sportfire is a V6...they sound kinda LAME with thru-hull...higher pitch and like one of those raspy little sports cars. Jim.

[Leedo Lanes]

Thanks for the tips Jim,

It does actually have a 4.3 so I was hesitant about what it would sound like. I thought about putting a 350 in it instead, both for more power, and a cool sound. Is this adviseable??

[Eriktheviking]

A 350 would certainly change the attitude of the boat.However if your outdrive isn't a 1:50 ratio you'ed have change the upper gear set too. http://www.checkmate-boats.com/infopop/emoticons/icon_frown.gif NOT CHEAP As far as S/S tips go,I see a bunch on Ebay all the time for about $75.-$100.00 pair.

[Leedo Lanes]

How do you determine if it is the 1:50 ratio or not?? (This stuff is somewhat new to me, I am used to working on airplanes!!)

[senator-holland]

i had a question too about exhaust:

1. I see that on the pricelist of new checkmate's there are three option's.
if you order the 4" tru transom exhaust with ss tips and inline mufflers, is there the open sound of the V8?
or do you have to order the option with electric select sound?

what is corsa quick and quiet?
what is the y-pipe?

[Leedo Lanes]

Who is the resident exhaust expert?? We need some guidance!

[Enforcer 24]

The thru-hull w/ inline mufflers and SS tips is open exhaust. The "mufflers" are the baffels in the tips themselves. This is the set up the I have. The corsa exhaust is routed out through the propeller via the Y-pipe which, like in a car, connects both left and right cylinder exaust manifolds together to form one single outlet and exit through the prop or just below the U-Joint bellow with its own exhaust bellow.

[Leedo Lanes]

Yeah, doesn't that allow you to use both?? (The corsa system that is). You can either go through hull or out the prop depending on the throttle??

[Enforcer 24]

The corsa is switch activated via the helm. You are correct about going through either or but throttle position is not a factor.

[JW]

I have personal experience with 4" exhaust and my 1995 Persuader 4.3LX.

Sounds GREAT at idle! Love it! But anything above 1,000 rpms and you'll hate it. Sounds lame. Also, if you do not re-jet the carburator when you run straight pipes on the carb 4.3, you'll lose a lot of top end power like I did. 5 mph worth!

After I found the Y-pipe thru-prop produced way more power for my stock 4 barrel carb than the 4" transom exhaust, I did some checking around and got the same answer from a lot of sources. When an engine is jetted for the Y-pipe and you hit the switch for the transom exhaust, a lot of torque goes away.
The best induction system for the switchable exhaust is the factory EFI system that can compensate for the changing exhaust restriction between open and prop exhaust. With a carb motor, you'll have to play with jetting until you find the sweet spot where switching the exhaust between the two settings will produce the least amount of performance loss.

[Leedo Lanes]

Wow,
Thanks JW.

So what system would you recommend me buying? Changing the 4.3 to fuel injected and going with the "Y" pipe?? Should I not even bother with the through transom exhaust?

[JW]

For the V6, I'd stay with a stock setup (Y pipe from manifolds down to the prop) and not bother with the through transom. It costs quite a bit of money for a Corsa switchable exhaust that only sounds good when it's at idle when in the transom mode.

If you really want to spend some money on mods, then go with a marinized 350 V8 with properly jetted Holley double pumper with through transom exhaust. Better yet, a nice barely used 350 Mag MPI would be a very nice motor to install! A lot of big dollar offshore boats come with base engines that the owners promptly take out and install a blown big block. You may be able to find a 'take-out' small block V8 for a reasonable price. There's a dealer by me with a 'take-out' 454 sitting in his showroom......

[Eriktheviking]

Leedo,
Look at the upper left side of your Alpha gear case and you should find the ratio #'s stamped into the case.

[Leedo Lanes]

Hey thanks guys!

This is all great advice. I don't want to ruin the boat or spend a ton of money on a dumb mod. JW, what would you call a "Reasonable" price on a 350??

Thanks for all the help. This is great!

[JW]

I don't know how much a 350 Mag installed is. I sold my Persuader before I could research it.

[175checkmate]

leedo, here ya go brother.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2464307532&category=50442

[175checkmate]

Carb version.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2463298610&category=50442

[175checkmate]

Here is a place that builds various stages of 350's
http://www.michiganmotorz.com/

[175checkmate]

One more.
http://www.marinepowerservice.com/?OVRAW=marine%20engines&OVKEY=engine%20marine&OVMTC=standard

[175checkmate]

Yet another place to look.
http://www.rebuiltmarineengines.com/

[Leedo Lanes]

Wow!

Thanks for all the info. What do you think about building up a 350?? Buy the block, then heads etc... I am reading that book on building a marine high performance small block and from the sounds of it, there aren't that many differences between a marine and an auto engine...

[175checkmate]

Not much differance between building a marine engine over a car engine. But if you are looking to build one your self and buy all the parts outright it will be hard to beat a crate motor. They are building crate motors now days almost as cheap as building one when you factor in machine work and such. And they come with a warrenty.

[Leedo Lanes]

Good advice.

Thanks, I appreciate it. I think you are right about the crate motors. Certainly more bang for the buck. And it is finished...(Almost)
I guess my other option is to get some performance out of my 4.3 Nothing beats a cool sounding V8 though!!

[jrumon]

If you have the room in front of the motor..go V8!!! That 4.3L uses the same bellhousing, coupler, wiring (not distributor), and all front accessories that the 5.0 and 5.7 (Chevy) V8's do...vene the motor mounts are the same (just move them forward)! Call around a few marine salvage yards... good running 350 magnum take-outs usually bring $1500-2000 complete with exhaust. Your V6 should bring $1000 back! DO THE SWAP...it's quick & easy!!! Jim

[Leedo Lanes]

Thanks Jim. It is in a 1989 Sportfire. I think I will take your advice if you think it wouldn't be too difficult for the swap. Sounds like a good fall project. Do you think I should go fuel injected??