V8 Mercury Marine engines.

Really cool job. Tough, but cool. I believe this engine is all we will build untill the next model comes out.

pics or it didnt happen

lol ok , i will take some

quote Originally posted by DanDamage: lol ok , i will take some

Yeah... pics...

I mean, what is that? 500 cubic inches? or just shy of it... 490 or something? I wanna put one of those in a car. That'll rival a Caddy 500!

Im working abroad I need to buy a new cellphone the one I have does not have a camera USB output for the PC for the pics of my actual job.

But at this dealer its the only motor we build untill they come out with a new one. All the pistons and every internal peice has GM stamps on it. The motor is a 496. It does not use a distributor , not sure if they use it in any cars/trucks but Mercury loves it.

For its size its actually really compact. When the engine is not dressed up with all the parts it looks tiny.

[This message has been edited by DanDamage (edited 03-27-2013).]

Can someone tell me why the exhaust manifolds are spitting out water? I looked at some other videos and they all do this. I assume it has something to do with it being a marine engine, but I wasn't aware that water was supposed to be dumped into the exhaust logs?

quote Originally posted by 82-T/A [At Work]: Can someone tell me why the exhaust manifolds are spitting out water? I looked at some other videos and they all do this. I assume it has something to do with it being a marine engine, but I wasn't aware that water was supposed to be dumped into the exhaust logs?

2 reasons, First cold water is pumped into either the heat exchanger ( closed cooling ) or through the engine ( open cooling), That water needs to exit the system to continue the flow of cold water circulation. Second is there is an exhaust system from the manifolds down and out the bottom of the transom through the lower unit. That exhaust system is inside the boat in an area with little air circulation and needs to be cooled.

The circulated water isn't dumped into the exhaust manifolds, it exits into the exhaust system above them at the exhaust elbows, The exhaust pressure keeps the recirulated water from falling down into the manifold and pushes it out the exhaust system.

[This message has been edited by jelly2m8 (edited 03-27-2013).]

^pretty intersting read. When we start them we have to hook up these huge hoses to the "exhaust"

So I imagine this core engine isnt in a truck ?

Im new here , I think the motor does not use spark plugs or distributor or both

quote Originally posted by jelly2m8: 2 reasons, First cold water is pumped into either the heat exchanger ( closed cooling ) or through the engine ( open cooling), That water needs to exit the system to continue the flow of cold water circulation. Second is there is an exhaust system from the manifolds down and out the bottom of the transom through the lower unit. That exhaust system is inside the boat in an area with little air circulation and needs to be cooled. The circulated water isn't dumped into the exhaust manifolds, it exits into the exhaust system above them at the exhaust elbows, The exhaust pressure keeps the recirulated water from falling down into the manifold and pushes it out the exhaust system.

So, when I install one of these in my Fiero, will I need to have a water tank? Hahah...

water tank in the trunk and i can picture the two sides coming out of the decklid spitting water at the car behind you LOL

quote Originally posted by DanDamage: Im working abroad I need to buy a new cellphone the one I have does not have a camera USB output for the PC for the pics of my actual job. But at this dealer its the only motor we build untill they come out with a new one. All the pistons and every internal peice has GM stamps on it. The motor is a 496. It does not use a distributor , not sure if they use it in any cars/trucks but Mercury loves it. For its size its actually really compact. When the engine is not dressed up with all the parts it looks tiny.

I have that 8.1 Litre engine in my motorhome and I have seen lots of Pickups with it in it as well

Many marine engines have a closed loop (fresh water) cooling system.
It recirculates water through a heat exchanger, similar to a radiator. Sea water is (I believe) circulated through the other portion of the heat exchanger. (Think "intercooler".)
This is especially useful in salt water, as the salt and other minerals can corrode the coolant passages in short order.
Water is pumped through the exhaust manifolds in order to cool them. Otherwise, they can get hot enough to set fire to nearby flammables (like wood or fiberglass boat components.)

This engine has to have sparkplugs.
I've heard, however, that GM adapted the later 350s to run on coil packs instead of a distributor.
I have to believe they did the same thing with the big block.

[This message has been edited by Raydar (edited 03-29-2013).]

quote Originally posted by DanDamage: Im new here , I think the motor does not use spark plugs or distributor or both

It's a gasoline engine, so it will have spark plugs. Actually, since it's an LSx based engine, it has the typical coil-near-plug ignition. No distributer; no ignition brick. Each coil sits on the valve cover, directly above its matching spark plug.

If you want more details (you know, since you build them and all ), you can check out the service manual here: http://www.marinepowerusa.c...4_Service_Manual.pdf

Thsi guy has the 8.1 in his 67 Chevelle:

http://www.automotiveforums...street_cars____.html

"was wondering if anybody else was running marine engine in anything? I am running a 8.1 G,M, based Indmar marine engine in a 67 SS chevelle pushing 450 hp. 560 tq. a real blast to drive:screwy:"

"The most significant "differences" between a "marine" BBC and a car or truck BBC, are the head gaskets (marine engines require a stainless steel fire ring), the expansion plugs (marine requires brass) and the camshaft. The carb is also slightly different, "venting" the bowl into the venturi (avoids external fuel leaks, VERY important on a boat...).Change the cam, add an intake and "big" carb, and instant "hot rod"... "

"In actuality, most marine engines these days are carbon-copies of what gets put in the street version. They add the brass freeze plugs, a bronzed lining in any aluminum water passage, a marine water pump, and mechanically speaking - that's pretty much it. It used to be that they ran larger bearing tolerances requiring 20w50 oil, but metallurgy has come so far in the last 30 years that they can use stock street tolerances and just use 10w30. "

"Marine Engines 101: ...."

thanks blacktree

sweet 2.5!

quote Originally posted by Blacktree: It's a gasoline engine, so it will have spark plugs. Actually, since it's an LSx based engine, it has the typical coil-near-plug ignition. No distributer; no ignition brick. Each coil sits on the valve cover, directly above its matching spark plug. If you want more details (you know, since you build them and all ), you can check out the service manual here: http://www.marinepowerusa.c...4_Service_Manual.pdf

It might be an "LSx based" engine, based on the engine management, but it's still an evolution of the old Big Block architecture. (Spark plugs are still included. )
I like the way they've done it though.

Too bad they don't have LSx style heads on it. These things would make gawdawful amounts of power.

I've been a marine mechanic for about 4 years. under the wing of a certified mercury marine master mechanic.
I've had to do a few of these myself, they are mpfi like a 2.8 fiero.
gm uses these in big non-diesel versions of work trucks.
and they are expensive!!! 7-10k a piece!!!

^that some serious loot! Thanks to all that posted in this topic!