Previous Thread
Next Thread
Print Thread
Page 1 of 3 1 2 3
which rod for a bracket motor #2189688
11/04/16 09:41 PM
11/04/16 09:41 PM
Joined: Dec 2006
Posts: 4,647
aotearoa
rebel Offline OP
master
rebel  Offline OP
master

Joined: Dec 2006
Posts: 4,647
aotearoa
i'm upgrading my combo, time to ditch the old rods & step up to something newer & stronger. I'm looking for a set of 6.535 rods to suit my stroker, HP is around 900, reving to 8k. what do you guys feel would be a good reliable rod to fit this combo?

Re: which rod for a bracket motor [Re: rebel] #2189737
11/04/16 10:36 PM
11/04/16 10:36 PM
Joined: Jan 2003
Posts: 16,376
D
dogdays Offline
I Live Here
dogdays  Offline
I Live Here
D

Joined: Jan 2003
Posts: 16,376
http://www.dragracecarparts.co/oliver-billet-i-beam-connecting-rods-bb-chevy-6-535-length-c6535bb8/

If cost is no object here they are. Callies Ultra would also be there, as would Crower or Carillo.

But realistically you could probably run Scat or Eagle H-beams or Molnar or Compstar or K1 or 440Source, no problem.

The real question is your rpm is 8000, what is your stroke and how much does the piston/pin weigh? The inertia loading at the top of the exhaust stroke is what kills rods, that and detonation.

R.

Re: which rod for a bracket motor [Re: rebel] #2189742
11/04/16 10:40 PM
11/04/16 10:40 PM
Joined: Mar 2006
Posts: 9,813
MI, usa
dvw Offline
master
dvw  Offline
master

Joined: Mar 2006
Posts: 9,813
MI, usa
I've been very happy with Molnar. Call Tom and give him your stroke, piston/pin/ring weight, and desired RPM level. He'll give you an honest answer. Mine were $579 shipped. The weight was light, tolerances were with-in .0001"
Doug

Re: which rod for a bracket motor [Re: rebel] #2189758
11/04/16 11:00 PM
11/04/16 11:00 PM
Joined: Jan 2003
Posts: 684
St. Charles, MO.
S
Slingshot383 Offline
mopar
Slingshot383  Offline
mopar
S

Joined: Jan 2003
Posts: 684
St. Charles, MO.
I've got a set of GRP rods mated to a set of Ross pistons that lived @ 8200 rpm, in a 408 cu.in 440-1C headed motor, injected on alcohol.


1994 Undercover Chassis 125" altered stack injected big block, soon blown and injected Member of The Torque and Recoil Club
Re: which rod for a bracket motor [Re: rebel] #2189776
11/04/16 11:32 PM
11/04/16 11:32 PM
Joined: Jan 2003
Posts: 5,762
Hot Rod Ridge
FastmOp Offline
master
FastmOp  Offline
master

Joined: Jan 2003
Posts: 5,762
Hot Rod Ridge
GRP here

Re: which rod for a bracket motor [Re: rebel] #2189897
11/05/16 08:47 AM
11/05/16 08:47 AM
Joined: Dec 2006
Posts: 4,647
aotearoa
rebel Offline OP
master
rebel  Offline OP
master

Joined: Dec 2006
Posts: 4,647
aotearoa
To be honest, I cant see myself using Scat, Eagle & definately not 440 Source rods in a 900 HP engine. I'm also leaning toward Steel rods so GRP's are out too. Never seen Molnar rods so i'm not sure how strong they are, i know theyre lighter but are they as strong as Compstars?
My pistons are custom Ross pieces @ 4.400 dia. with their generic pins running at 12.5 compression running on on gas, no spray.
i remember a few years back someone did a comparrission test of the different rods, anybody have a link to that?

Re: which rod for a bracket motor [Re: rebel] #2189915
11/05/16 10:14 AM
11/05/16 10:14 AM
Joined: May 2003
Posts: 13,185
aZLiViN
J
J_BODY Offline
I Live Here
J_BODY  Offline
I Live Here
J

Joined: May 2003
Posts: 13,185
aZLiViN
questions about Molnar rods? Call Tom himself.

Re: which rod for a bracket motor [Re: rebel] #2189923
11/05/16 10:46 AM
11/05/16 10:46 AM
Joined: Jan 2003
Posts: 2,915
A shed in England
Tig Offline
master
Tig  Offline
master

Joined: Jan 2003
Posts: 2,915
A shed in England
Oliver make good rods also up


'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
Re: which rod for a bracket motor [Re: rebel] #2189928
11/05/16 10:54 AM
11/05/16 10:54 AM
Joined: Jan 2003
Posts: 11,705
Portage,michigan
B
B3422W5 Offline
I Live Here
B3422W5  Offline
I Live Here
B

Joined: Jan 2003
Posts: 11,705
Portage,michigan
Had real good luck with compstar rods.


69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8

Re: which rod for a bracket motor [Re: rebel] #2189959
11/05/16 12:09 PM
11/05/16 12:09 PM
Joined: Jan 2007
Posts: 8,031
Mt Morris Michigan
mopar dave Offline
master
mopar dave  Offline
master

Joined: Jan 2007
Posts: 8,031
Mt Morris Michigan
The molnars come with ARP2000 bolts as well. The machining is very nice and for the price I think they are a bargain.

Re: which rod for a bracket motor [Re: rebel] #2189995
11/05/16 01:10 PM
11/05/16 01:10 PM
Joined: Jan 2003
Posts: 11,705
Portage,michigan
B
B3422W5 Offline
I Live Here
B3422W5  Offline
I Live Here
B

Joined: Jan 2003
Posts: 11,705
Portage,michigan
Local racer around here has an 8 second w8 barracuda. He broke a molnar Rod in it


69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8

Re: which rod for a bracket motor [Re: B3422W5] #2190006
11/05/16 01:25 PM
11/05/16 01:25 PM
Joined: Feb 2005
Posts: 20,145
PA.
pittsburghracer Offline
"Little"John
pittsburghracer  Offline
"Little"John

Joined: Feb 2005
Posts: 20,145
PA.
Originally Posted By B3422W5
Local racer around here has an 8 second w8 barracuda. He broke a molnar Rod in it



Lol. Some guys can break anything and lots of issues can too. High rpm, bad engine building technics, oiling issues, and MANY more. Some guys shift at 8000 rpm without ever trying 7000 rpm


1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time




Re: which rod for a bracket motor [Re: B3422W5] #2190017
11/05/16 01:37 PM
11/05/16 01:37 PM
Joined: Jan 2007
Posts: 8,031
Mt Morris Michigan
mopar dave Offline
master
mopar dave  Offline
master

Joined: Jan 2007
Posts: 8,031
Mt Morris Michigan
Im sure someone some where in the world has broke a Oliver rod as well. Just sayin

Re: which rod for a bracket motor [Re: rebel] #2190022
11/05/16 01:42 PM
11/05/16 01:42 PM
Joined: Oct 2004
Posts: 3,097
back in Georgia
dthemi Offline
master
dthemi  Offline
master

Joined: Oct 2004
Posts: 3,097
back in Georgia
Most of the broken rods I see are from spun bearings (from tight oil clearance), or locked wrist pins, same issue, too tight.

Re: which rod for a bracket motor [Re: dthemi] #2190026
11/05/16 01:45 PM
11/05/16 01:45 PM
Joined: Feb 2005
Posts: 20,145
PA.
pittsburghracer Offline
"Little"John
pittsburghracer  Offline
"Little"John

Joined: Feb 2005
Posts: 20,145
PA.
Originally Posted By dthemi
Most of the broken rods I see are from spun bearings (from tight oil clearance), or locked wrist pins, same issue, too tight.



Or people that think because an engine block coming from a machine shop LOOKS clean, it is clean.


1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time




Re: which rod for a bracket motor [Re: pittsburghracer] #2190095
11/05/16 03:27 PM
11/05/16 03:27 PM
Joined: Aug 2003
Posts: 43,097
Bend,OR USA
C
Cab_Burge Online work
I Win
Cab_Burge  Online Work
I Win
C

Joined: Aug 2003
Posts: 43,097
Bend,OR USA
Originally Posted By pittsburghracer
Originally Posted By dthemi
Most of the broken rods I see are from spun bearings (from tight oil clearance), or locked wrist pins, same issue, too tight.



Or people that think because an engine block coming from a machine shop LOOKS clean, it is clean.
Valid point up
Engine assembly is like brain surgery, it is absolutely freaking impossible to keep it to clean work


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: which rod for a bracket motor [Re: J_BODY] #2190151
11/05/16 05:36 PM
11/05/16 05:36 PM
Joined: Dec 2006
Posts: 4,647
aotearoa
rebel Offline OP
master
rebel  Offline OP
master

Joined: Dec 2006
Posts: 4,647
aotearoa
Originally Posted By J_BODY
questions about Molnar rods? Call Tom himself.


the thing about asking the seller is sometimes they'll just tell you want you want to hear, bit like car salesmen. Hence this is why i'm asking here so i can get some real world experiances on the different brands. Unfortunately you have to weed thru the folk that know what theyre talking about & those who only have an opinion because they have that brand & they consider it to be the bomb, even if theyre not using it to the capacity i want to be. maybe i should have done a post on 900HP engines & asked what rods they used & for how long they've run them?

Re: which rod for a bracket motor [Re: rebel] #2190170
11/05/16 06:01 PM
11/05/16 06:01 PM
Joined: Feb 2005
Posts: 20,145
PA.
pittsburghracer Offline
"Little"John
pittsburghracer  Offline
"Little"John

Joined: Feb 2005
Posts: 20,145
PA.
The more info you provide in your post the better replies you will get back. Garbage in, garbage out


1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time




Re: which rod for a bracket motor [Re: rebel] #2190177
11/05/16 06:07 PM
11/05/16 06:07 PM
Joined: Oct 2007
Posts: 3,978
Hilltown Pa
1967dartgt Offline
master
1967dartgt  Offline
master

Joined: Oct 2007
Posts: 3,978
Hilltown Pa
Crower or Carrillo.


Brett Miller W9 cnc'd heads
STR Chassis fabraction
Re: which rod for a bracket motor [Re: rebel] #2190183
11/05/16 06:18 PM
11/05/16 06:18 PM
Joined: Dec 2006
Posts: 4,647
aotearoa
rebel Offline OP
master
rebel  Offline OP
master

Joined: Dec 2006
Posts: 4,647
aotearoa
your possibly right Pittsburgh, but i thought 900 HP & 8k rpm limit might have reduced the possible options for good answers. i guess i need to be more specific even with that info.
so looking for...
6.535 length STEEL H beam rods
900HP power output
8000 rpm limit
565grm Custom Ross Pistons
No spray
4.250 stroke
am i missing anything?

Page 1 of 3 1 2 3






Powered by UBB.threads™ PHP Forum Software 7.7.1