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Hot Rod magazine stock bottom end 4.8 1200hp

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Old 07-21-2011, 02:38 PM   #1
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Hot Rod magazine stock bottom end 4.8 1200hp

Just thumbed through the new hot rod magazine to see...

4.8
118 octane race gas
Twin 76mm eBay turbos
Cam
Ported heads
Arp head studs
Fast Intake and throttle body
26.8 psi for 1,203 hp!!! Still didnt go boom...
Old 07-21-2011, 03:21 PM   #2
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Re: Hot Rod magazine stock bottom end 4.8 1200hp

yea but how much longer will it hold together?
Old 07-21-2011, 03:28 PM   #3
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Re: Hot Rod magazine stock bottom end 4.8 1200hp

apparently it was asking for more but the ignition couldn't keep up.
Old 07-21-2011, 03:43 PM   #4
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Re: Hot Rod magazine stock bottom end 4.8 1200hp

They made over 60 pulls and it didnt blow up....thats amazing
Old 07-21-2011, 03:46 PM   #5
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Re: Hot Rod magazine stock bottom end 4.8 1200hp

stock rotating assembly?
Old 07-21-2011, 04:19 PM   #6
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Re: Hot Rod magazine stock bottom end 4.8 1200hp

Stock rotating assembly... Rusty junkyard motor. Had rust inside cylinder number 8 that they tried to hone out...
Old 07-21-2011, 04:21 PM   #7
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Re: Hot Rod magazine stock bottom end 4.8 1200hp

Only thing they changed was ring gap but reused stock rings
Old 07-21-2011, 04:28 PM   #8
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Re: Hot Rod magazine stock bottom end 4.8 1200hp

I wanna see some pictures
Old 07-21-2011, 04:45 PM   #9
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Re: Hot Rod magazine stock bottom end 4.8 1200hp

yep ticking time bomb...
Old 07-21-2011, 05:06 PM   #10
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Re: Hot Rod magazine stock bottom end 4.8 1200hp

Link to a forum posting http://www.performancetrucks.net/for...-going-485734/
Old 07-21-2011, 07:32 PM   #11
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Re: Hot Rod magazine stock bottom end 4.8 1200hp

Quote: Originally Posted by s10studduts01s
yep ticking time bomb...
that was the point they wanted to see what a stock ls could hold before it let loose.
Old 07-21-2011, 07:42 PM   #12
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Re: Hot Rod magazine stock bottom end 4.8 1200hp

I know that was the point...but put that thing in a car and run it at the track where it sees a real load instead of on an engine dyno where it IATs aren't nearly as high as you would see at the track and im sure it wouldn't make too many passes at that power level. granted the numbers are impressive I just think some people are going to be disappointed when they try to duplicate the build and they don't see as many pulls at that power level before it blows up...I just think the article is a little misleading is all im saying.
Old 07-22-2011, 10:37 AM   #13
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Re: Hot Rod magazine stock bottom end 4.8 1200hp

because it effects me, i am interested in speculation as to how long u guys think it will last at 700 hp versus the 1200 in the real world? this is very close to the setup im researching and if the stock rotating assembly will last 50k at this power lvl ill be happy.
Old 07-22-2011, 12:19 PM   #14
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Re: Hot Rod magazine stock bottom end 4.8 1200hp

I think it's mostly in the tune... Detonation will even kill a forged motor!
Old 07-22-2011, 12:38 PM   #15
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Re: Hot Rod magazine stock bottom end 4.8 1200hp

At 500-700 HP, a perfect tune and 93+ octane gas, an efficient intercooler and methanol/H20 injection. It should live a very long time.
Old 07-22-2011, 04:38 PM   #16
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Re: Hot Rod magazine stock bottom end 4.8 1200hp

they still made 50+ passes over 1000hp and nothing went south, pretty darn good for a stock motor with god knows how many miles on it. i know what some of you are saying, but put a stock 350 4 bolt with a twin turbo set-up and try to get to 27psi and see what happens. it's still pretty amazing that a truck engine can withstand that much boost and not break with stock used lower end.

i doubt dodge or ford engines could survive that much punishment and not break.
Old 07-22-2011, 05:10 PM   #17
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Re: Hot Rod magazine stock bottom end 4.8 1200hp

The one thing that no one has mentioned was the cylinder damage noted before doing the test. One cylinder had a huge rust stain in #8. They left it "as-is" and still did over 100 pulls. (they did increase the upper ring gap on all the pistons.)

75lb injectors, worm clamps on the tubing.
Old 07-24-2011, 10:44 AM   #18
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Re: Hot Rod magazine stock bottom end 4.8 1200hp

Quote: Originally Posted by s10studduts01s
I know that was the point...but put that thing in a car and run it at the track where it sees a real load instead of on an engine dyno where it IATs aren't nearly as high as you would see at the track and im sure it wouldn't make too many passes at that power level. granted the numbers are impressive I just think some people are going to be disappointed when they try to duplicate the build and they don't see as many pulls at that power level before it blows up...I just think the article is a little misleading is all im saying.
Thats any magazine build though. Take your favorite car mag, rip out all the full page ads, rip out the dyno hero number builds, rip out the ads disguised as tech articles. Whats left? Maybe 5-10 pages?
This engine came to mind, I still remember the article because it pissed me off so much
http://www.carcraft.com/techarticles...ild/index.html
I'd love to see how many "bang shifts at 7800" this stock block motor could take.
Not because its a ford, I don't discriminate. Because its stupid.
Old 07-24-2011, 04:17 PM   #19
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Re: Hot Rod magazine stock bottom end 4.8 1200hp

Quote: Originally Posted by s10studduts01s
I know that was the point...but put that thing in a car and run it at the track where it sees a real load instead of on an engine dyno where it IATs aren't nearly as high as you would see at the track and im sure it wouldn't make too many passes at that power level. granted the numbers are impressive I just think some people are going to be disappointed when they try to duplicate the build and they don't see as many pulls at that power level before it blows up...I just think the article is a little misleading is all im saying.
I've seen more motors let loose during dyno pulls then at the drags and I've seen a hell of a lot more cars drag race, then get dynoed
I don't see the IAT being higher at the drag, then in a shop with stagnet air around the vehicle only being circulated by a 3 or 4 foot fan.
Old 07-24-2011, 04:36 PM   #20
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Re: Hot Rod magazine stock bottom end 4.8 1200hp

inside source says they have over 120 runs.. and no issues, that article was written 2 months ago.
Old 07-25-2011, 12:15 AM   #21
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Re: Hot Rod magazine stock bottom end 4.8 1200hp

Quote: Originally Posted by badmatt
inside source says they have over 120 runs.. and no issues, that article was written 2 months ago.
at the same power level as it was in the article minus the drive train loss obviously?
Old 07-25-2011, 12:48 AM   #22
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Re: Hot Rod magazine stock bottom end 4.8 1200hp

Quote: Originally Posted by poconojoe
I've seen more motors let loose during dyno pulls then at the drags and I've seen a hell of a lot more cars drag race, then get dynoed
I don't see the IAT being higher at the drag, then in a shop with stagnet air around the vehicle only being circulated by a 3 or 4 foot fan.
yea but you're talking about engines that aren't pushing the envelope like this one is either...were also not talking about a car dyno. Were talking about an engine dyno where the crank doesn't see the stress it would if it was installed in a car. I just don't think that people should take to heart too much of what car magazines or car tv shows tell you sometimes...
Old 07-25-2011, 09:04 PM   #23
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Re: Hot Rod magazine stock bottom end 4.8 1200hp

Actually, in most applications there would be less strees on the crank on a chassis dyno.
I totally agree about not having a lot of faith in magazine articles, Ive been in the back ground of a few and even though I'd say there weren't any lies told, they certianly didn't tell the wholle story and the vendors come first even if they ended up not using their product
Old 07-25-2011, 11:32 PM   #24
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Re: Hot Rod magazine stock bottom end 4.8 1200hp

I think the article should be taken as an example that the LS engine are tougher than the old 2nd gen 350's and 305's and not that you should stick twin turbo's at 27psi on a stock 4.8.

I think their point was proven but people don't need to try and build a drag truck with their setup.
Old 07-26-2011, 08:29 PM   #25
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Re: Hot Rod magazine stock bottom end 4.8 1200hp

Apples and oranges. Interesting and cool though. Engine dyno is a controlled environment with no external forces.

I'd be willing to bet a person could jump off a 5th story balcony and walk away, but are you going to be the one that tries it?
Old 09-11-2011, 12:12 PM   #26
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Re: Hot Rod magazine stock bottom end 4.8 1200hp

The guys that are arguing about whether or not it will run that at the track and not explode, really missed the point.

All that is saying to me, is that you can feel safe bolting on their sponsors bolt on blower, turbo, and nitrous kits for 600hp all day long lol.

F-n impressive either way.... 1200hp on a 150k mile 280ci truck motor that had 250hp stock. If it ran one pull, I would have been impressed no less 60.

Last edited by philntx; 09-13-2011 at 11:41 AM. Reason: cleaned up
Old 09-12-2011, 02:05 PM   #27
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Re: Hot Rod magazine stock bottom end 4.8 1200hp

You guys are nuts. At over 120 dyno pulls, thats a two year race season. And hell if you blow it up go buy another one from the junk yard for $500.
Old 09-14-2011, 11:37 PM   #28
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Re: Hot Rod magazine stock bottom end 4.8 1200hp

http://www.hotrod.com/techarticles/h...g_bang_theory/
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