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MERCRUISER 470

A

AirAg

Well-known member
I remember a long time ago Waterthunder was talking about this little engine. And a recent post reminded me about it, so I thought I would ask some questions. What type of power (hp, torque) are we talking about if a 460 ford head is used? Is this whole engine (including the head) aluminum? What type of carb is used (or fuel injection)? Just thought I would further my ever growing knowledge.

Thanks,

Brent
 
AirAg, there are both aluminum block and iron block 470's ...... all of them have an iron head as delivered as I understand it.
There are, however, aluminum heads that will bolt to this little motor, and the all aluminum motor would be what you'd want. Waterthunder would be the man to tell you the what and where of all of that.

With a gearbox or belt drive you could probably turn something like a 76" 3 blade 'Q' propeller.
On a small, light boat you'd have a little hot rod, and you should be able to run all day on 10 gals. of gas.
 
I did a stock rebuild on one of these engines years ago and was impressed with the pieces used inside. The block is aluminum and cast by some exotic european car company like Maseratti or something, thats what I was told. It had a steel forged crank with 460 steel rods and 460 forged pistons. The head was real nice. It was a 460 head,cast iron, and utilized 2.25" intake valves and like 1.9" exhaust. Huge ports that have some good possibilties. The motor was basically half a 460 . It was fresh water cooled and carburated. I think the rating was 170 HP from what I remember. Parts were easy to get for the inside. The head was a Cobra Jet casting or something. I do not remember what the bellhousing pattern was. I always thought this motor had lots of potential for a small airboat.
Hope this helps.
 
A light just came on up here ..... Merkur is German Ford. That explains why the big block Ford heads fit that engine. That has to be what it is.
Good post, man. I love this website. :D
 
So it is the Merkur? :D Been there done that! I had two of those bad boys, one to drive and one for parts. The driver was a white 86 and the parts car was a blue one. They were built on the line one behind the other. (Thats another long story) Fair warning, that little som-b!*$h will drive you !@#$%^&* crazy!! :twisted: Bought the white one brand new, the other a few years later. New one stayed in the shop more than on the road :twisted: BUT, when she was a running, she was like a scalded dog, nothing could touch her. I took a Maserati on interstate 95 just south of Titusville one night. We played around w/ the turbo boost doing this and that and were lucky never to have blown her up. Lost both of them in a divorce, one week later the new owner totaled the white one. :angryfire: I also wrecked one on the autobahn at a very high rate of speed ( another story) thats how I came to knowing and owning them.
 
Now come on, Fatboy. You're confusing this stuff with the stuff that silver haired widows drive. Sedan DeVille or something like that ..... :D :D .
 
This has brought up two questions.

What kind of torque are we looking at? I figure my little PE90 is making around 280 ft-lbs. Trying to compare.

And what about the bellhousing? Can you even put on a gear box/beltdrive with this motor?

Fun topic!

Brent
 
Hey Air, I can not remember what the bellhousing pattern was. Im thinking chevy, but we need Thunder on here to get more info. This motor was the next step up from the 140HP Pontiac 4cyl. motor so the torque should be more than that motor. Good luck. P.S. We at least know an outdrive will fit it :wink: .
 
Thunder thinks that 350 reliable hp is not a problem, and that he's seen race motors that more than doubled that.
The bolt pattern matches a Chevy, so all boxes and belts work. That would take care of the torque.

I'm wanting to have Thunder build me an aluminum one, and as soon as Blue Lightning offers a 2.5 ratio, drop it into a 12', 2 seat lightweight aluminum hull. It will be lighter than an 0360 with almost twice the horsepower.

It should be a little rocket and at the time very easy on gas. If any of y'all want to build one before me, go for it. I'll catch up.
 
Not yet, 5Gen. To be honest I've been too busy this Winter to look but I want to get on it before long. I'll need two ...... one for Thunder to build, and another block for the mock-up to build the riggin.
 
WHAT SIZE PROP ARE YOU THINKING ABOUT USING ? ALSO IVE BEEN SEARCHING FOR INFO ON THE ENGINE AND ABOUT MODIFYING THESE ENGINES WHAT HAVE YOU FOUND?
 
5Gen, I wouldn't be at all surprised if this little engine could easily turn a 3 blade 76" 'Q', and maybe more. It would be a light little hoss of a combination.

If my math is right the engine, belt, and radiator would weigh less than an 0360, make double the horses, and a lot more torque. :)
 
HEY OLF I DON'T MEAN TO BE NAGGING YOU BUT WHERE DID YOU FIND THE WEIGHTS ? HAVE YOU FOUND ANY WEB SIGHTS WITH PEOPLE BUILDING THESE ENGINES FOR CARS ETC? THANKS FOR THE INFO I'M EXITED ABOUT THIS . P.S. WHATS THE TORQUE NUMBERS?
 
When Thunder builds the motor we'll do a pull on the dyno and post the numbers.
You've gotta remember though that we're going to put a Blue Lightning belt on it with a 2.5 or 2.6 ratio.
When you hear the torque numbers, you'll have to multiply them by that amount ..... 8) .
 
Just to let you know, the Blue Lightning only comes in a 2.3 to 1 ratio and right now only fits late model chevy crank bolt pattern. We are gearing up for LS motor bolt pattern (chevy had to go and change things again). But 2.3 ratio with no friction loss, and the dimensions this offers makes for a great setup.

Bob
 
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