supercharging on a stock block

[Bradley G]

I read several members posting up that they exceed 400 RWHP on a stock Marauder engine.
I just want to make clear there are inherient risks to doing this no mater what you read here or what someone tells you.
I have had my Trilogy kit on the car since 2005 it has 113500 miles on a stock block.
I have been very fortunate not to have incurred an driveine failure thus far.
If it blows up today on my way to Chicago, I realize the risks I have taken by modifying it.
I realize some members have exceeded the 500 RWHP mark on a stock block, but even Lidio told me he wonders how some of these motors hold together at that level and some won't .
I was at 400 HP before any adjustments and my tuner Lonnie Doll said before he threw some fuel at certain points in the tune, "How luckey do you feel?"

I had a 5 1/2 hour return trip home with a car seven years old with an excess of 100K miles.
I said, "put me where you think I will be able to hand the keys over, without my hands sweating while they are gone".

[blazen71]

That's why I had Bob stop at 425rwhp. With the current set-up I have it could be at 450 easy. Maybe add a boost-a-pump. The second pull was 440rwhp. He backed it off and its been heaven ever since!

[massacre]

my tuner Lonnie Doll said before he threw some fuel at certain points in the tune, "How luckey do you feel?"

Hahahaha Lonnie is awesome!

:banana2:

[RacerX]

I realize some members have exceeded the 500 RWHP mark on a stock block, but even Lidio told me he wonders how some of these motors hold together at that level and some won't.
Some of those have specific "race tunes" where they can put higher octane fuel in at the track and some just have more timing pulled and fuel being dumped in. Yes, that is riding the edge though imho. Some may not care and can put a new engine in when they ventilate the block anyway! :beer:

[SC Cheesehead]

Matt kept the tune pretty conservative on my car. It dynoed at 423 originally and he left some on the table.

He's got another in the x-cal that'll add 10-15 hp, but he recommended that for race fuel only.

[Spectragod]

Mine is conservative now, I think it's capable of a lot more, but it's nice and safe.

[LANDY]

Push it to the limit.........

[justbob]

445 for two years! It's only up from here..

Sent from my Ally using Tapatalk

[bigmerc'03]

434 here with no problems ...4 years and still pulling strong

[guspech750]

Nice and safe for a DTR, 23.8 hp :) LOL


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[Motorhead350]

456 and the issue was the tuner. Still running strong, even with the tick.

[Spectragod]

521 on the stock "block", the internal components are not though.

[Vortech347]

The "Block" is good for 750-800rwhp.

The Internals, not so much.

Rods/pistons I wouldn't run them over 450 with aggressive driving. 450-475 can survive but not if you get into the go pedal much.

The cranks are actually fairly stout, 500-600ish would be OK.

[Bradley G]

I'm @ 418/420 hp tq , so it's not like I hope to grenade the motor anytime soon.
Tons of motors have not survived even N/A levels

[SC Cheesehead]

I'm @ 418/420 hp tq , so it's not like I hope to grenade the motor anytime soon.
Tons of motors have not survived even N/A levels

Our motors do NOT handle detonation issues very well. FBM's blew up right in front of me on the way up to Gainesville at MVIV, apparently due to nothing more than bad gas.

But yeah, you should be in good shape with yours. Bradley, S/C'd at those power levels should be very reliable.

[BODYMAN]

The "Block" is good for 750-800rwhp.

The Internals, not so much.

Rods/pistons I wouldn't run them over 450 with aggressive driving. 450-475 can survive but not if you get into the go pedal much.

The cranks are actually fairly stout, 500-600ish would be OK.

What you said here has a big factor on it also. How do you drive youre car if you drive agressive most the time and youre up around 475 youll eat it however be smart with it and you can go along way..

[99SVT]

The things to keep in mind for keeping a stock short block together with a S/C is RPM and detonation.

The more RPM the engine sees the more likely you are to throw one of the powdered metal rods, when SVT was doing engine trials for the 03 Cobra they found that the powdered rods would ventilate the blocks at random when they ran them up to redline. Less RPM puts less stress on weak rods and keeps them together longer.

The pistons have a habit of breaking off ring lands at the hint of detonation, bad fuel or overly agressive timing can destroy a motor in seconds. Paying attention to the motor especially after fueling up can keep the engine running for a long time.

There are a few other things to be aware of as well.
- 4-2 downshifts, this increases piston speed faster than the rods can handle, Lightnings are more prone to this due to the increased stroke and higher piston speed of the 5.4l.
- At some point, probably just over 500whp, the pistons can start to expand enough to scuff the cylinder walls due to the tight assembly tolerances. Short durations at that power level may be OK (1/4 mile with no hot lapping), but sustained high boost runs without adequte cooldown or hot lapping can blow an engine.

[Vortech347]

The hyper pistons don't have the expansion problems the 03/04 Cobra shortblocks do.

[MM_BKK]

The hyper pistons just have a bad habit of grenading the ringland if you encounter detonation as previously mentioned.

The 03/04 Cobra shortblock have forged pistons.

ANY engine with forged pistons must run more PTW clearance than cast or hyper pistons due to more expansion. That is just the nature of the beast.
I don't see that being a problem. Infact, I'd rather deal with that problem than the other one (premature piston self-destruction).