4.6 big bore reliability issues - TCCoA Forums
 
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post #1 of 12 (permalink) Old 11-02-2006, 07:43 AM Thread Starter
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4.6 big bore reliability issues

just like the title says. are there any reliability shortcomings of a 4.6 big bore as far short life expectancy due to heat or other issues. i plan on having the motor on the street. thanks, Dave
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post #2 of 12 (permalink) Old 11-02-2006, 03:28 PM
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No issues at all, everything works normally, especially if you go with one from Modular Performance. They were the first to be doing the process, but I've read some things about other engine builders out there who's product tends to eat head gaskets. It all has to do with the prep of the deck surface after the resleeve in an effort to have easier machining and lower costs. I don't know if John @ MP wants me letting out his trade secrets.

The only other issue is boost. Don't plan on running more than 16 PSI or so, since the head gaskets are so thin because of the fatter bores. But, then again, you'll make more power with less boost anyhow, so high pressure isn't really needed from the beginning.

Pete

-97 XR-7
-5.0 Big Bore ...
Ran @ Normal Operating Temps, No Race Tune, No Setup Changes from Daily Driven Configurations
9.0 @ 78 (1/8 Mile only in Abilene )
2.06 60' on Street Tires (BFG G-Force Super Sport 245/50/16)
3805 Lbs, Stock Exhaust Manifolds
Density Altitude = 4132'
That Run, Corrected for Standard Day
1/8 mile: 8.75 @ 82
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post #3 of 12 (permalink) Old 11-02-2006, 06:20 PM
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pete, just to clarify, do you mean thin as in: actual head gasket thickness, or as in: the bore-to-bore distance is less due to the 3.7" bore?
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post #4 of 12 (permalink) Old 11-02-2006, 07:28 PM
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Oh, sorry about that. They are actualy Cometic head gaskets, really good pieces. If I recall correctly, typical materials don't survive because there is only 6mm of bore spacing between the cylinders after Modular Performance installs the new sleeves. The gaskets can even be reused once with no worries.

Pete

-97 XR-7
-5.0 Big Bore ...
Ran @ Normal Operating Temps, No Race Tune, No Setup Changes from Daily Driven Configurations
9.0 @ 78 (1/8 Mile only in Abilene )
2.06 60' on Street Tires (BFG G-Force Super Sport 245/50/16)
3805 Lbs, Stock Exhaust Manifolds
Density Altitude = 4132'
That Run, Corrected for Standard Day
1/8 mile: 8.75 @ 82
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post #5 of 12 (permalink) Old 11-08-2006, 12:21 AM
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I know that the company with the head gasket issue installs their 3.7" sleeves upside down compared to the way that Modular Performance or Renegade Racing do.

The only issue I have with my 5.0L Big-Bore is staying off the fun pedal.

R.I.P. Johnny Langton (1975 - 2011)

1996 Thunderbird 5.0L 2V-4R70W
12.64 @ 107 MPH -> DA 3315 Ft above Sea level
12.49 @ 109 -> DA 2967 Ft above Sea level
2005 Mustang GT 4.6L 3V-TR3650 - SOLD
13.39 @ 102 MPH -> DA 3617 Ft above Sea level
2011 Mustang GT 5.0L 4V-6R80 - Bolt-ons
12.32 @ 115 MPH -> DA 2980 Ft above Sea level
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post #6 of 12 (permalink) Old 11-08-2006, 01:29 AM
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Yep, that and the way the sleeve and deck the block too....

Pete

-97 XR-7
-5.0 Big Bore ...
Ran @ Normal Operating Temps, No Race Tune, No Setup Changes from Daily Driven Configurations
9.0 @ 78 (1/8 Mile only in Abilene )
2.06 60' on Street Tires (BFG G-Force Super Sport 245/50/16)
3805 Lbs, Stock Exhaust Manifolds
Density Altitude = 4132'
That Run, Corrected for Standard Day
1/8 mile: 8.75 @ 82
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post #7 of 12 (permalink) Old 11-26-2006, 01:29 PM
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I also have a BB from Modular Performance. I could not be happier with my motor. It is VERY hard to stay off the pedal. Im running 9psi of boost right now, planning on going twin screw race kit from AED to 16psi soon. Im actually going to pulley for 16spi but will see about 14psi on the gauge due to my better flowing motor, so ill be more in the safe zone, but will be making great power. Im even going to top it off with about a 50-75hp shot for those close races.

If your going BB I would go with Modular Performance or Renagade.

Its also my daily driver.

Good luck.

2002 EXPLORER: 400+whp 2v/M90 434tq / 401rwhp @ 9psi.. suv, 20's, IRS, slush box
COMING SOON: Modular Performance 324ci, Trick Flow Heads w/custom grind cams, Tork Tech TVS SC
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post #8 of 12 (permalink) Old 11-27-2006, 05:19 PM
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How much horse does a 5.0 big bore have? just a question i'm thinking about getting one.
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post #9 of 12 (permalink) Old 11-27-2006, 07:01 PM
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All depends on what cams you use and what heads you go with, especially when you choose between SOHC and DOHC. But, for a SOHC, plan on getting 40-60 more RWHP than an identical motor of the standard bore. The shape of the dyno curve stays almost identical, but how much you get depends on a lot of factors.

Pete

-97 XR-7
-5.0 Big Bore ...
Ran @ Normal Operating Temps, No Race Tune, No Setup Changes from Daily Driven Configurations
9.0 @ 78 (1/8 Mile only in Abilene )
2.06 60' on Street Tires (BFG G-Force Super Sport 245/50/16)
3805 Lbs, Stock Exhaust Manifolds
Density Altitude = 4132'
That Run, Corrected for Standard Day
1/8 mile: 8.75 @ 82
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post #10 of 12 (permalink) Old 11-27-2006, 09:13 PM
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Quote:
Originally Posted by Tim
How much horse does a 5.0 big bore have? just a question i'm thinking about getting one.
Mine made 294 RWHP uncorrected on a Mustang Dyno in 95+ weather and 100% humidity.

R.I.P. Johnny Langton (1975 - 2011)

1996 Thunderbird 5.0L 2V-4R70W
12.64 @ 107 MPH -> DA 3315 Ft above Sea level
12.49 @ 109 -> DA 2967 Ft above Sea level
2005 Mustang GT 4.6L 3V-TR3650 - SOLD
13.39 @ 102 MPH -> DA 3617 Ft above Sea level
2011 Mustang GT 5.0L 4V-6R80 - Bolt-ons
12.32 @ 115 MPH -> DA 2980 Ft above Sea level
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post #11 of 12 (permalink) Old 11-27-2006, 11:19 PM
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Quote:
Originally Posted by TGJ
Mine made 294 RWHP uncorrected on a Mustang Dyno in 95+ weather and 100% humidity.
With what other mods?

2002 EXPLORER: 400+whp 2v/M90 434tq / 401rwhp @ 9psi.. suv, 20's, IRS, slush box
COMING SOON: Modular Performance 324ci, Trick Flow Heads w/custom grind cams, Tork Tech TVS SC
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post #12 of 12 (permalink) Old 11-28-2006, 04:56 PM
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Quote:
Originally Posted by awdRocks
With what other mods?
Breakdown is this.

Renegade Racing Big-Bore, roughly 10.2:1 Compression ratio
Renegade Racing P&P NPI heads
Crower Stg 2 PI SC cams
Plastic PI intake
C&L upper intake
BBK 75mm TB
Big Kooks TBird headers
TFHS 4R70W
4200 RPM Stall TC
4.30 TLok Rear-end

There is a few other things if you want all the nitty gritty. You can read about that here. Due note, even though the numbers don't really reflect it, I am pretty sure SAE corrected on a DynoJet, the car would make around 330 RWHP as is.

R.I.P. Johnny Langton (1975 - 2011)

1996 Thunderbird 5.0L 2V-4R70W
12.64 @ 107 MPH -> DA 3315 Ft above Sea level
12.49 @ 109 -> DA 2967 Ft above Sea level
2005 Mustang GT 4.6L 3V-TR3650 - SOLD
13.39 @ 102 MPH -> DA 3617 Ft above Sea level
2011 Mustang GT 5.0L 4V-6R80 - Bolt-ons
12.32 @ 115 MPH -> DA 2980 Ft above Sea level
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