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Thread: Manley H Beam rods? How much HP?
12-05-2007, 04:49 PM #1
Manley H Beam rods? How much HP?
I've done the usual reading and searching through threads, and i've been to the website and read the HP ratings which i know plenty of people have exceeded the "700" hp listed rating.
I'm going to be having my motor built in january and need to get an idea of what most people are making on these rods? Right now im either having to pick between these and the Billet I beams.
The current setup is a custom single turbo setup running a Single GT42-76.
The I beams will definately get me over the 1000rwhp mark but what about the H beams? There is a conciderable price difference between the two and rightly so concidering.
Will the H beams handle 850rwhp-900rwhp or would that put them on borrowed time even with a good tune? I'd like to hit the 1k mark but I'f i can do with with the H beams is unknown to me.
Any help would be appreciatedMods? Nah.....
12-05-2007, 05:05 PM #2
mine made 815rwhp.. they only rated my h beams to 700 flywheel hp.. i was gonna take them to 1000rwhp, but I blew a headgasket.. if i were u i would go ahead and do the billet rods.. thats what Im runnin now..
HCIE LMB C6 Z06 N/A
612rwhp/562rwtq w/ STOCK compression, all motor.
10.552 1/4 in crap weather on 604rwhp and stock gears, 10.20s or better coming soon
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12-05-2007, 05:53 PM #3
Was quoted they were a 1200 upgrade over the Hbeams
I figure if nothing else i could run the h beams to around 850rwhp and then swap to the I beams later
12-05-2007, 06:00 PM #4
the shop im associated with has been running a eagle H beam on their race car for over 2 years. Making over 1000rwhp the whole time.
Its up to you, i personally think a H beam will be fine.
12-05-2007, 07:22 PM #5
h beam will prob be fine.. but to "swap"out the h beams for billet rods is no easy task.. not only does the motor have to be pulled but the motor has to be disassembled, re-balanced, etc.etc.etc. and will cost a ton!
u can get forged h beams for $350 and billet ones for $1,200.
12-05-2007, 09:05 PM #6
- Join Date
- December 2006
- Gainesville, VA
get the I beams and you won't ever have to worry about upgrading!!!!!
04 Silver Cobra
Kenne Bell 2.6h
12-05-2007, 09:15 PM #7
I would say go with the billets, but if you want to save some money, and run H-beams, with the best rod bolts you can.
Black 00 WS.6 M6
SOM 01 WS.6
Couple of Bolt-ons.
12-05-2007, 09:17 PM #8
- Join Date
- March 2006
if your looking for 1000hp I would get those I beams. Throw some nice pistons on them and you never have to think about the bottom end again...
12-09-2007, 01:59 AM #9
I sleep better at night with the billet Manley's. Spend the extra money now and you won't be sorry later.99 Cobra #76, VT engine, 9cc CP pistons, Manley billet rods, billet oil pump gears, stage 3 ported heads, Ford GT cams, Procharger D1sc @ 19.5# w/ race bypass, Nazman ported intake, head cooling mod, Accufab single blade tb, custom made 4" intake system, 03 cobra tank, twin gt pumps, Kenne Bell bap, stage II fpdm and wiring, 60# mototron injectors, PMAS and SCT tune.
Spec stage 3+ clutch, Tremec tko, Steeda adj cable, quadrant and fire wall adjuster, aluminum drive shaft, 4.10's.
American Racing headers, matching x pipe and Magnaflow cat back.
Bilstein struts/shocks, Steeda bumpsteer kit, Steeda x2 ball joints, QA1 k-member, Energy suspension total polyurethane kit, MM caster/camber plates, full length subframe connectors, cross drilled and slotted rotors, stainless steel brake lines.
2000 Cobra R hood, Saleen side skirts, scoops and spoiler, chrome Cobra R wheels w/ 245/45-17 fronts, 285/40-17 nittos 555 rear.
Alpine cd, stock 460 amps and speakers, JL Audio 1000/1V2 amp, 2 JL W6 12" woofers in custom box, Stinger 1 farad cap.
650 rwhp, 523 lbs Tq @ 7000 rpms with 19.5# boost.
2001 Lightning, mostly stock, not dyno'd yet.
12-09-2007, 02:12 AM #10
12-11-2007, 08:13 PM #11
With 1000rwhp, you'll need all you can get . You may want to have those Manley billets blessed with holy water too.94 Cobra - H/C/I '99 DOHC (10:1), T-Trim, Air-H2O Cooler, LT's, T-56, 4.10's, SCT, C10 629/517
12-12-2007, 12:06 AM #12
Meh thats not near the max rating for the I beams. It's like 1200rwhp or so. I could always step up to 300m's though lol
12-19-2007, 11:48 AM #13
It's all about having a good tune.....
I have seen Manley H beams hold up to 1700hp for 2+ years on a full on race car.... Then a set of Eagle H beams hold the same.
But if it would have been detonating.... well that would have been the end of them instantly.
I know countless cars making 800+ rwhp, with NO issues with the H beams.
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12-20-2007, 01:29 AM #14
I thought the h beams use 3/8 bolts and the good i beams used 7/16? That's quite a difference in equal quality bolts. Since it is being built, apart etc. I'd do the 7/16's.1969 Gt 428 4 Speed w stuff gone to Scotland
2003 Sonic Blue Cobra w stuff
1994 White T bird 4.6
Sterling Gray 5.0 jlt, x/or, bama tuned auto
12-21-2007, 11:15 PM #15
make sure you get a quality rod bolt
arp 2000's will do the trick
12-22-2007, 12:39 AM #16
Carrillo FTMFW66' Coupe 408ci/tko 600/Moser 9"/on radials
12-22-2007, 03:39 PM #17
Thanks for the info guys, any info is definately appreciated.
Anyone used these for over 900rwhp?
12-23-2007, 02:41 AM #18
we have had a race car w/ H-beam making over 1000rwhp thru a powerglide for 2 years with those rods.
12-23-2007, 12:45 PM #19
- Join Date
- March 2006
Whats the difference between MMR H beam rods (made by Manley) and the standard Manley brand H beam rods? They look the same. I have been wondering this for awhile....