July 25, 2014, 11:05:16 PM

Author Topic: Hot Rod Magazine makes 1200HP on "junkyard" 4.8L... stock bottom end!  (Read 8512 times)

Offline mattster03

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I was reading this article last night and figured I would share.  It was their intentention to build a 5.3L but ended up finding out it was a 4.8L.  :cheers:




1993 Mazda RX7 R1, LS1/T56, EPS 230/238, TSP Ported heads
10.826 @ 128 , 1.53 60' - SOLD

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Offline cool

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Re: Hot Rod Magazine makes 1200HP on "junkyard" 4.8L... stock bottom end!
« Reply #1 on: August 22, 2011, 01:45:46 PM »
That set the bar pretty high for Speedfabs truck...

Offline wickedrx7

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Re: Hot Rod Magazine makes 1200HP on "junkyard" 4.8L... stock bottom end!
« Reply #2 on: August 22, 2011, 01:46:45 PM »
Very cool.

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Offline thetastelingers

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Re: Hot Rod Magazine makes 1200HP on "junkyard" 4.8L... stock bottom end!
« Reply #3 on: August 22, 2011, 02:10:02 PM »
That set the bar pretty high for Speedfabs truck...
Or a certain RX7 that is built on this site...
wazzaaaaaaaaaaaapppppp!

Offline forcefed86

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Re: Hot Rod Magazine makes 1200HP on "junkyard" 4.8L... stock bottom end!
« Reply #4 on: August 22, 2011, 04:17:32 PM »
There are many rumoprs that the bore to stroke ratio of the 4.8 is more favorable to a boosted engine. Now they need to do the same test with teh same kit on an iron 5.3, 6.0, and LS1 and L33.

Offline mattster03

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Re: Hot Rod Magazine makes 1200HP on "junkyard" 4.8L... stock bottom end!
« Reply #5 on: August 22, 2011, 04:22:15 PM »
There are many rumoprs that the bore to stroke ratio of the 4.8 is more favorable to a boosted engine. Now they need to do the same test with teh same kit on an iron 5.3, 6.0, and LS1 and L33.

that was my frustration with the article... i now need to see the results with the 5.3 and 6.0!  I also would have preferred they fix the 'ignition' failure and run it to mechanical failure as they promised.
1993 Mazda RX7 R1, LS1/T56, EPS 230/238, TSP Ported heads
10.826 @ 128 , 1.53 60' - SOLD

Feature Article - http://www.importmeet.com/blog/2012/03/29/best-of-both-worlds-v8rx7guys-ls1-swapped-1993-mazda-rx-7/
Build & Race Compilation Video - http://www.youtube.com/watch?v=oMyojHnA1ok
Swap Info - http://www.cardomain.com/ride/2801662

1986 Mazda RX7 GXL, LT1/T56 "Retired"
Swap Info - http://www.cardomain.com/ride/641869

Offline Daniel

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Re: Hot Rod Magazine makes 1200HP on "junkyard" 4.8L... stock bottom end!
« Reply #6 on: August 22, 2011, 04:38:33 PM »
The magazines are actually on a very tight budget now and do pay for the dyno time.  If they ran out of time, which I'm sure they did, they can't just come back another day.  There are a lot of runs there and a lot of data.  Its one of the better stories I've seen done in quite a while.

Offline forcefed86

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Re: Hot Rod Magazine makes 1200HP on "junkyard" 4.8L... stock bottom end!
« Reply #7 on: August 22, 2011, 05:22:54 PM »
not to mention the engines condition before and after. Id like to get a mic reading before and after on the bearings after that. Its free to tear down the engine and inspect it!

Offline BeasTT

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Re: Hot Rod Magazine makes 1200HP on "junkyard" 4.8L... stock bottom end!
« Reply #8 on: August 22, 2011, 06:22:27 PM »
Their a2w's are shinier than mine :(
Nick Shultz

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Offline zbrown

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Re: Hot Rod Magazine makes 1200HP on "junkyard" 4.8L... stock bottom end!
« Reply #9 on: August 22, 2011, 09:10:06 PM »
Very cool no matter how you look at it
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Offline DavidPHumes

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Re: Hot Rod Magazine makes 1200HP on "junkyard" 4.8L... stock bottom end!
« Reply #10 on: August 22, 2011, 09:12:42 PM »
Yeah, this is pretty awesome I'd say. I'd never do it in my own person car but it's not my  :bacon:
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Offline forcefed86

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Re: Hot Rod Magazine makes 1200HP on "junkyard" 4.8L... stock bottom end!
« Reply #11 on: August 22, 2011, 10:54:32 PM »
Not to mention those are those cheapo cxracing "Chinese" turbos. Seem to be working ok to me! 

http://www.cxracing.com/mm5/merchant.mvc?Screen=PROD&Store_Code=CXR&Product_Code=TRB-T76-P96-O&Category_Code=TOCH

Offline dark-one

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Re: Hot Rod Magazine makes 1200HP on "junkyard" 4.8L... stock bottom end!
« Reply #12 on: August 24, 2011, 01:10:25 AM »
well shit maybe I need to just find a 4.8 liter  :scratch:

Offline 383mazda

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Re: Hot Rod Magazine makes 1200HP on "junkyard" 4.8L... stock bottom end!
« Reply #13 on: August 24, 2011, 10:54:08 PM »
Hmm... so should I gap my rings larger before I put my motor in?  BTW the CXRacing / chinese turbos are good other than the piston rings - they like to fail quickly - rebuilding with good garrett rings would cost you less than $20, but you do need a way to put it back together and make sure it's balanced...
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Offline atomicsix

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Re: Hot Rod Magazine makes 1200HP on "junkyard" 4.8L... stock bottom end!
« Reply #14 on: August 24, 2011, 11:55:59 PM »
Hmm... so should I gap my rings larger before I put my motor in?  BTW the CXRacing / chinese turbos are good other than the piston rings - they like to fail quickly - rebuilding with good garrett rings would cost you less than $20, but you do need a way to put it back together and make sure it's balanced...

Probably depends on the power output you are going after. We have been well over 650 to the rear wheels with no regapping.

Standard gap on a mid nine run, and standard gap on some low nine runs with E85. These cars were all 3200lb to 3500 lb weight.

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