Ford 460 power question

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Marius

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« on: August 21, 2019, 02:29:08 AM »
Hello.. i got an issue with my boat.

I have a Glastron CVX20 with a Berkeley JE12 pump with A aluminium impeller. Place diverter and the "sports" loader i think.
Pump is recently rebuilt and the impeller looked like new.
Stock this boat comes with Ford 460 rated at 320 Hp, turning the A impeller at 4600 rpm.

Now i have a new built motor, a Ford 466, it did 485 at 5150 rpm in the dyno.
I have been kind to it in the beginning almost just have run it on the primary jets...
So after some days i thought i should open it up and see how it would run at full speed.
At first i notice that the motor stalls for a split second when i open the secondaries, then run as it should..
But it's only turning the A impeller at 4500 rpm.... so i got the same speed as with a stock motor..

What do the jet people think, shouldn't it be going faster?





« Last Edit: August 21, 2019, 02:37:16 AM by Marius »


FordLover

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« Reply #1 on: August 21, 2019, 02:18:03 PM »
Same carb that was on the last engine and just plopped on this new engine? What carb?
Timing was set properly?

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Marius

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« Reply #2 on: August 22, 2019, 12:09:05 AM »
Same carb that was on the last engine and just plopped on this new engine? What carb?
Timing was set properly?

Sent from my LG-TP450 using SoCal Jet Boats mobile app

No, the stock motor had an Edelbrock 750.

The new motor has a Quickfuel 850M
Timing was set in the dyno, haven't touched it since.

Marius

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« Reply #3 on: August 27, 2019, 11:36:03 PM »
I took the motor cover off to check fuel pressure while driving.

At idle i have 6,5 psi.. at full throttle it pulses between 4-5 psi...  ::)

What fuel pressure are you guys feeding your carbs with ?

LakesOnly

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« Reply #4 on: September 14, 2019, 01:02:14 PM »

I have a Glastron CVX20 with a Berkeley JE12 pump with A aluminium impeller. Place diverter and the "sports" loader i think.
Pump is recently rebuilt and the impeller looked like new.
Stock this boat comes with Ford 460 rated at 320 Hp, turning the A impeller at 4600 rpm.

Now i have a new built motor, a Ford 466, it did 485 at 5150 rpm in the dyno.
I have been kind to it in the beginning almost just have run it on the primary jets...
So after some days i thought i should open it up and see how it would run at full speed.
At first i notice that the motor stalls for a split second when i open the secondaries, then run as it should..
But it's only turning the A impeller at 4500 rpm.... so i got the same speed as with a stock motor..

What do the jet people think, shouldn't it be going faster?
What was the exhaust system used on the dyno? Tubular headers?
And now in the boat the engine has cast manifolds? Well, there's your answer (ie, the reason for your power loss). :)


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LakesOnly

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« Reply #5 on: September 14, 2019, 01:04:46 PM »
.
PS: ALSO....



.
First: wow, over 500 ft-lbs of torque over a 1500 rpm spread, very nice.
Second: at 5100 rpm horsepower was still climbing, and I'd say based on extrapolation that your engine produces more than 500 hp at a higher rpm (at about 5300 rpm).

.

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Marius

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« Reply #6 on: September 21, 2019, 01:32:19 PM »
You think so Paul, are my cast manifolds destroying my power that much?
I know they are worse than the tubular headers we used in the dyno, but i hoped they were ok up to 500 hp.. ;D

I see others with the same manifolds are running over 5000 rpm...   but i guess that is not an answer saying that it will work on my motor combination ?

WOT


Here's the manifold type..


82 baja 460

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« Reply #7 on: October 07, 2019, 08:31:59 AM »
Nice boat it sounds awesome! I'm new to this forum I have the same 460 with the Berkeley JE A cut. How much did it cost to get your 460 to the 485hp range?  That is something I would like to do down the road.  Currently My Baja is still stock with 320hp and I'm getting 59mph at 4600rpm on my gps .

mash on it

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« Reply #8 on: October 07, 2019, 12:02:17 PM »
Nice boat it sounds awesome! I'm new to this forum I have the same 460 with the Berkeley JE A cut. How much did it cost to get your 460 to the 485hp range?  That is something I would like to do down the road.  Currently My Baja is still stock with 320hp and I'm getting 59mph at 4600rpm on my gps .

Marius is in Norway.
Building a Big block Ford in Norway would be extremely expensive vs. here in the states.

Paul (lakes only) at high flow dynamics would be my choice on a 460.

Dan'l
CJ/RR 212...under construction  "Pistol Annie"

Marius

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« Reply #9 on: October 16, 2019, 12:28:36 AM »
Nice boat it sounds awesome! I'm new to this forum I have the same 460 with the Berkeley JE A cut. How much did it cost to get your 460 to the 485hp range?  That is something I would like to do down the road.  Currently My Baja is still stock with 320hp and I'm getting 59mph at 4600rpm on my gps .

I was lucky to get a overhauled 460 for $3100 (todays valuta) with new pistons and bearings, .030 overbored.
If i was going to get my own 460 fixed, which lost oil pressure at full throttle, i would have to pay around $5000 for machining and parts.
Got the heads reworked by a specialist, porting, machined for studs and resurfacing for a little more compression. ($1500)
I also got Scorpion roller rockers, thicker pushrods, camshaft and lifters from Paul (Lakes Only)
I've spent almost $10000 on this motor in total, includes everything from gaskets to flame arrestor.
I have to pay tax and shipping on parts from the states, so every part get's a little more expensive to me.

I might have gained more power with another intake, but as my boat has a motor cover, it can't be any higher than the Edelbrock Performer RPM which i have.
I'm very pleased with the power output, as it was more than i hoped for.

But it's a little sad that i't won't perform in my boat.
I was hoping the cast manifold didn't cut the power that much.. right now my boat only have stock performance.
Turning almost exactly the same rpm as the stock 320 HP motor at full throttle.
Guess i need to get some headers on it instead of the cast manifold.. but jacketed headers are not cheap! :-\
« Last Edit: October 16, 2019, 12:43:29 AM by Marius »

Marius

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« Reply #10 on: October 16, 2019, 12:37:51 AM »
What was the exhaust system used on the dyno? Tubular headers?
And now in the boat the engine has cast manifolds? Well, there's your answer (ie, the reason for your power loss). :)

A pic of the headers used in the dyno



Marius

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« Reply #11 on: October 16, 2019, 12:39:45 AM »
doublepost.
« Last Edit: October 16, 2019, 12:41:46 AM by Marius »

pickleforkcanuck

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« Reply #12 on: December 04, 2019, 03:12:50 PM »
Just off hand do you have the specs on the camshaft, thanks in advance

 


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