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Author
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Topic: Press Fit vrs Bushed Rods
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mainer
Gearhead Posts: 168
From: Bryant Pond, Maine
Registered: Sep 2003
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posted 10-01-2003 07:01 PM
 
What's the pro/cons of this choice. The rods for my 393 come both ways, the bushed version being a few $'s more.Thanks,
don
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Mpcoluv
Gearhead Posts: 1421
From: Charlotte NC usa
Registered: Apr 2001
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posted 10-01-2003 07:07 PM
What is your application?
In a full out race application, it is thought that the floating pins are worth a few extra HP.
In a street strip motor, you will never see a difference.
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mainer
Gearhead Posts: 168
From: Bryant Pond, Maine
Registered: Sep 2003
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posted 10-01-2003 08:25 PM
Thanks, this will be an occasional test/tune fun car so it sounds like the press fit are fine. don
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CHIPSBAD67
Gearhead Posts: 396
From: LOU,KY;USA
Registered: Sep 2003
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posted 10-01-2003 10:42 PM
press fit baby! ------------------
306, 4speed, 4.11's....best 1/8 mile 7.58 at 92mph with 1.72 60ft. PUMP GAS/NO ADDERS/STREET TIRES
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Tbird
Gearhead Posts: 298
From: USA
Registered: May 2003
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posted 10-02-2003 07:30 AM
I like bushed rods and not pressed fit. Some machine shops heat the small end of the rod too much to get the pin in. To me, this could alter the metallurgy of the rods and the heat treatment.
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kid vishus
Gearhead Posts: 7251
From: middle of NC
Registered: Oct 2000
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posted 10-02-2003 08:28 AM
I also prefer bushed rods. I feel press fit is good for stock rebuilds, but not for anything hi-performance.
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jsracingbbf
unregistered
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posted 10-02-2003 08:59 AM
I like the bushed ones myself. Makes things easier later when re-building. ------------------
JS
69 Mustang Pro ET Drag
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Rustang
Gearhead Posts: 880
From: Clarion PA
Registered: Nov 2000
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posted 10-02-2003 10:19 AM
If they're a production rod I'd be hesitant to go bushed. Sometimes the factory don't get the hole centered on the forging and after it's bushed the material's too thin and it'll break. An old trick is to still float the wrist pin, but go "steel-on-steel" without a bushing. Just drill an oil hole near the top of the wrist pin hole and this set-up works fine. ------------------
'68 mustang 351 clevor- 10.92@124
'67 Stang, 351W -11.18@118
'69 351C Torino-14.90@100
'78 Pickup 351W-15.56@88
'79 Pickup 460 ET=??
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n2oMike
Gearhead Posts: 3058
From: Spencer, WV
Registered: Jan 2001
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posted 10-02-2003 02:15 PM
The 289 rods in my 302 were shot peened, had ARP Pro-Series bolts installed, and used press-fit pins. I had zero problems.The rods in this new engine are Boss 302 units using press fit pins. Many stock rods are just too thin (in my opinion) to drill out for a bronze bushing. If the rod is too thin in this area, bushing might do more harm than good. Plus... I hate installing spiro-locks! Good Luck! ------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220
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Rustang
Gearhead Posts: 880
From: Clarion PA
Registered: Nov 2000
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posted 10-02-2003 02:29 PM
My windsor motor was pressed pins with stock truck rods and never had a problem with 7200rpm shifts. I did go thru 3 sets of rods before I had a set that had good material around the wrist pin bore. The one thing I was always nervous about was how much the rods had "blued" after the machine shop installed the pins. So heat can be an issue. I was especially nervous because on their first attempt they put the domed pistons on backwards and had to reheat the rods to reinstall! 
If I ever put together another lo-buck screamer I'll float 'em steel on steel!------------------
'68 mustang 351 clevor- 10.92@124
'67 Stang, 351W -11.18@118
'69 351C Torino-14.90@100
'78 Pickup 351W-15.56@88
'79 Pickup 460 ET=??
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Ryan Wilke
Gearhead Posts: 3237
From: Stanton, Michigan, zip 48888
Registered: Oct 2000
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posted 10-02-2003 07:08 PM
quote:
Originally posted by n2oMike:
....I hate installing spiro-locks!
I'LL SECOND THAT MOTION!! Not only did I turn my fingertips into hamburger,,,,I think I invented a few new cuss words while I was at it!! Ryan 
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smblk t-bolt
Gearhead Posts: 102
From: port alberni BC Canada
Registered: Apr 2002
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posted 10-02-2003 08:09 PM
My 289 has full floating pins/pistons done without the bushing (its steel on steel) and its survived 3 rebuilds and LOTS of 6500+ shifts. the rods are basically stock with arp bolts and a good balance job.ron
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Tbird
Gearhead Posts: 298
From: USA
Registered: May 2003
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posted 10-03-2003 08:36 AM
Installing spiro-locks aren't the pain....It is taking them back out is what is the pain....
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kid vishus
Gearhead Posts: 7251
From: middle of NC
Registered: Oct 2000
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posted 10-03-2003 09:00 AM
I've ran bushed rods in my stock cleveland rods for years without any problems from them. I have broken about everything around them, but never had a problem with the small end of the bushed rods.
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