Crankshaft Mopar Performance 0.040 in

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360tripleblack7

360tripleblack7

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Dear MoparManiacs

My name is Diego Jones. I live in Brazil and have a 1977' Brazilian Dodge Charger. A-Body with a 318 stroker 360 engine. I use the engine crankshaft Mopar Performance, PN: DCC-5007257 318/340 main.

Purchased at Summit Racing: http://store.summitracing.com/partdetail.asp?part=DCC-5007257&autoview=sku

I had a problem with the oil pump and a crankshaft of the damaged rods.

Send it to retifer. been measured with 0.040 in

I risk breaking the engine is turning 7000 RPM with the crankshaft since 0.040?

YOUTUBE video of My Dodge Charger on Drag Race: http://www.youtube.com/watch?v=GXYSfUCsd-4

Thanks...
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What is your horsepower level Diego? .040 is allot to take off the rods but Chevy rods are .125 smaller to begin with and they hold up pretty well. I would think you'll be ok if not over 450 hp. Just my opinion.

BTW: Welcome to the board. Your Charger sounds like it runs good. What 1/4 mile times do you run?
 
Hey Diego;

The oil pump failed? Or just doesn't pump enuff oil?

The oiling system on a small block engine is ok until approx. 6,000 rpm's and not much more at all. 7,000 is to many rpm's unless you have made modifications to the oil system.

Also, most engines will make peak power way below this rpm.

On the crank. Was the crank cut down .040?
Or was it the rods were cut down .040 on there big end?

I know the crank can be cut that much without problems. I don't know about the rods though. I never had the rods cut down so much before. I do not see a problem, but like I said, I just don't know.

Cool video by the way.
 
fishy68 said:
What is your horsepower level Diego? .040 is allot to take off the rods but Chevy rods are .125 smaller to begin with and they hold up pretty well. I would think you'll be ok if not over 450 hp. Just my opinion.

BTW: Welcome to the board. Your Charger sounds like it runs good. What 1/4 mile times do you run?
Click to expand...
Dear Fishy68,

My horsepower level is between 410 and 430 hps. The car has constantly 12.8s in quarter mile with radial tires.

Engine Configuration:

KB Hypereutetic Pistons
OEM Connecting rods with ARP Screews
Mopar Performance Purple Camshaft 296/296 Mechanical
Cylinder heads is a mopar 915 J heads 2.02, 1.60 with 58cc chambem combustion
Compression ratio 11,1:1
Intake Manifold is a Torker II
Carburator is Mighty Demon 750
Oil Pump is a Meiling High-Volume

Thanks for your tips...
 
Hello rumblefisch360,

Surely the oil pump lost pressure.

I really did not make any changes to the lubrication circuit of the block. I believe this may have contributed to the problem in the crankshaft.

Actually, when I took the engine in the dyno, it was found that peak power at 6400 RPM.


On the crankshaft. Yes he will be at .040

2.125 - 0.040 = 2.085

I have no problems. Put of the MSD limiter at 6500 rpm to as of now.


Thanks for your tips...

Diego
 
I'd get another crank 40 under is excessive,builders i know won't touch anything more then 20 under...
 
Not a big deal to run run .040 under. Done it before, would do it again.

To me it's no different than running spacers to run a smaller journal crank in a big bore, like a 340 crank in a 360 block.

Make sure your oiling system is up to the task. Drill extra holes in the filter plate is one spot that is very simple.

If you engine makes peak at 6400, don't put a 6500 chip in an MSD unit. They are known to start dropping cylinders a few hundred RPM before the actual rating. Put a 6800 or 6900 chip in the box to get clean ignition signals to 6400, plus a little extra in case you run through the lights at higher than peak rpm.
 
Dear Crakedback,

Thanks for your tips. I made the holes for the extra lubrication as you indicated. I' ll be mounting the engine in Saturday. then put the assembly in the photos forum.

Thanks
 
I would not expect a long life running it that hard at .040 undersize. I would be concerned shifting at 6500. The MPs are a cast crank, and even tho the stroke is not 4". the power carrying potential has been drastically reduced. I am hoping it was internally balanced.
 
crackedback said:
Not a big deal to run run .040 under. Done it before, would do it again.

To me it's no different than running spacers to run a smaller journal crank in a big bore, like a 340 crank in a 360 block.

Make sure your oiling system is up to the task. Drill extra holes in the filter plate is one spot that is very simple.

If you engine makes peak at 6400, don't put a 6500 chip in an MSD unit. They are known to start dropping cylinders a few hundred RPM before the actual rating. Put a 6800 or 6900 chip in the box to get clean ignition signals to 6400, plus a little extra in case you run through the lights at higher than peak rpm.
Click to expand...
I just get the crankshaft in retifer. To my surprise he made with .030

anyone know a rod bearing to race with this measure?

Thanks...
 
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