So that 5.7 V8 waterpump in the boot....

[cptsideways]

of the boat


Have aquired my first ever yankee V8 a Chevy 5.7 hemi four barrel, re-badged as an OMC Cobra that's lurking in the back of our newly purchased boat. It does sound nice I have to say!!! the 45gallon fuel tank may take some getting used to though

Alledgedly it's 260bhp but I some how doubt that, feels more like 160 to me


So what makes these go faster?? apart from a basic tune up.

It's in the back of this, we might be out at the Bournemouth airshow with it if I can sort it in time & the weather holds up.

[Qwert1e]

cptsideways said:

the 45gallon fuel tank may take some getting used to though

Have you found out yet how long a tank of fuel will last?

[Escort3500]

Don't think Chevrolet ever made a true Hemi motor. It sounds like a 350ci, and there's plenty of aftermarket kit for them - aluminium (sorry, aloominum) big valve heads, tubular headers, fuel injection etc. Have a lookSummit's website for inspiration. Quite a few dealers of parts in the UK too - Real Steel, USAutomotive

[C.A.R.]

Hmm, that reminds me. We recently had a meal in a place called the Four Winds pub in Cornwall. Don't go, it's probably the worst restaraunt I've ever visited.

Nice boat.

[Alucidnation]

cptsideways said:

.... & the weather holds up.

Good thinking.

You wouldn't want to get wet.

[996TT02]

Qwert1e said:

Have you found out yet how long a tank of fuel will last?

Probably 12 gal/hr at cruise so 3.75 hrs!

[mwstewart]

Love boating! She looks to have been well cared for.

Where are you mooring her? Poole, Salterns?

[J4CKO]

cptsideways said:

So what makes these go faster??

Putting it in a car ?

[VxDuncan]

Chevy V8 was strangled by the emissions law, along with the rest of them. Compression and airflow are the biggies to look at. A top end kit with cam, intake and high flow aftermarket heads will give you a lot more power without touching the bottom end. The chevy 350 is fairly easily stroked to 393 ci as a further cheap way to get more power. Not sure the impact of the extra torque on the rest of your driveline however.

"How to build max performance chevy small blocks on a budget" is a brilliant starting point book, with dyno'd combinations on different parts at the end to see what the different combos should give you.

[cptsideways]

On the plane at 25mph-30mph I'm expecting 1m/L or 4.5mpg which is a pretty average figure for boats.

[waynedear]

Pft, our lifeboat has a 1200 gallon tank for the twin Cat 1250hp engines....lol

I have spent many hours of my life standing (usually in the rain) holding the nozzles in the tanks.

Nice looking boat you have there.

[Huntsman]

cptsideways said:

On the plane at 25mph-30mph I'm expecting 1m/L or 4.5mpg which is a pretty average figure for boats.

That's about right. But put the hammer down and it'll drink like George Best.

[leigh1050]

Escort3500 said:

Don't think Chevrolet ever made a true Hemi motor. It sounds like a 350ci, and there's plenty of aftermarket kit for them - aluminium (sorry, aloominum) big valve heads, tubular headers, fuel injection etc. Have a lookSummit's website for inspiration. Quite a few dealers of parts in the UK too - Real Steel, USAutomotive

Dodge Make a 5.7 Hemi,Mistake perhaps in calling it a Chevy!

[skyrover]

very tunable engine's with massive aftermarket support... how much power do you want?

400+ is easily attainable

[kev b]

I recall standing near a fuelling dock the first time I visited Florida, a powerboat took on 100 gallons of gasoline and rumbled off into the sea, sounding like the car chase from Bullit.

Imagine my surprise when, not long after, it returned to refuel. That's when I realised that powerboats were probably going to be beyond my reach for a while and I should probably aim for something cheaper to run, like a Ferrari.

[Otispunkmeyer]

Yep, if you think super cars are expensive to run don't look at what it costs to run their water borne equivalents! It's eyewatering!

[Qwert1e]

I've seen reports that if you tune the engine for more power it can drain a big tank of fuel very fast, especially if you're trying to push a hull beyond its design speed.

http://www.boatdesign.net/forums/gas-engines/fuel-...

[robinessex]

Best not buy this then:-

3 x 1075hp $499,000

http://www.powerboatlistings.com/view/14931

Edited by robinessex on Wednesday 27th August 18:05

[Coatesy351]

See above running

http://youtu.be/aeIVOfOBnNQ

[robinessex]

Coatesy351 said:

See above running

http://youtu.be/aeIVOfOBnNQ

See !! It's the NOISE. Bloody fantastic!!!!