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half groove bearing or full groove #1464796 07/08/13 02:14 PM 07/08/13 02:14 PM
Joined: May 2012 Posts: 69 Fairhope, Alabama B BeeSuper OP member
BeeSuper OP member B Joined: May 2012 Posts: 69 Fairhope, Alabama	Just to be sure guys, the stroker kit I want to buy from Hughes comes with 1/2 groove rod and main bearings, 2.2 journal with fillet. Some books say for a performance build I need full groove bearings. Will the half groove be ok? ( clevite 77)

Re: half groove bearing or full groove [Re: BeeSuper] #1464797 07/08/13 02:20 PM 07/08/13 02:20 PM
Joined: Jul 2008 Posts: 30,424 Florida STAYcation dOrk ! The village idiot's idiot
dOrk ! The village idiot's idiot Joined: Jul 2008 Posts: 30,424 Florida STAYcation	I like the full-groove ... but the NARROWER style .... Michigan bearing made them and the only place I ever saw them available was from JC Whitney ....

Re: half groove bearing or full groove [Re: BeeSuper] #1464798 07/08/13 03:06 PM 07/08/13 03:06 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	I just pulled my W-2 stroke apart the other day... it has full groove mains and those bearings(both mains and rods) looked like new.. I replaced them but could have put them right back in... that engine has been running 6 years in the race car... its going in the Rampage now.. I replaced the bearings with the same part number

Re: half groove bearing or full groove [Re: MR_P_BODY] #1464799 07/08/13 03:18 PM 07/08/13 03:18 PM
Joined: Jan 2010 Posts: 1,442 NW Chicago suburban area Mopar Mitch pro stock
Mopar Mitch pro stock Joined: Jan 2010 Posts: 1,442 NW Chicago suburban area	What is actually the very best (for racing/hi-perf) is to use 3/4 grooved bearings... the top should be fully grooved; the bottom should be grooved at the outer edges ~25% per side so to allow the bottom to be solid. That design is proven to provide the bottom thrust face being solid to absorb the greatest amount of force. I think Federal-Mogul (via their "Speed Pro" line) sells 3/4 grooved bearings. ("Fully-grooved" is yester-year's technology.) You can call the Federal-Mogul Tech-Line and discuss this with them. Mopar Mitch "Road racers and autocrossers go in deeper and come out harder!"... and rain never stops us from having fun with our cars... in fact, it makes us better drivers! Check out MOPAR ACTION MAGAZINE, August 2006 issue for feature article and specs on my autocross T/A!

Re: half groove bearing or full groove [Re: Mopar Mitch] #1464800 07/08/13 03:49 PM 07/08/13 03:49 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: What is actually the very best (for racing/hi-perf) is to use 3/4 grooved bearings... the top should be fully grooved; the bottom should be grooved at the outer edges ~25% per side so to allow the bottom to be solid. That design is proven to provide the bottom thrust face being solid to absorb the greatest amount of force. I think Federal-Mogul (via their "Speed Pro" line) sells 3/4 grooved bearings. ("Fully-grooved" is yester-year's technology.) You can call the Federal-Mogul Tech-Line and discuss this with them. Yes they are... a well know indy builder told me that the best is 5/8 of the diameter but we dont have that so the 3/4 would be next... and in cases they are hard to find for our stuff

Re: half groove bearing or full groove [Re: MR_P_BODY] #1464801 07/08/13 04:35 PM 07/08/13 04:35 PM
Joined: Jan 2007 Posts: 685 pennsylvania poboyengineering mopar
poboyengineering mopar Joined: Jan 2007 Posts: 685 pennsylvania	Quote: Quote: What is actually the very best (for racing/hi-perf) is to use 3/4 grooved bearings... the top should be fully grooved; the bottom should be grooved at the outer edges ~25% per side so to allow the bottom to be solid. That design is proven to provide the bottom thrust face being solid to absorb the greatest amount of force. I think Federal-Mogul (via their "Speed Pro" line) sells 3/4 grooved bearings. ("Fully-grooved" is yester-year's technology.) You can call the Federal-Mogul Tech-Line and discuss this with them. Yes they are... a well know indy builder told me that the best is 5/8 of the diameter but we dont have that so the 3/4 would be next... and in cases they are hard to find for our stuff just looked up the speed pro line, and part 120M appears to be a 5/8 groove for a 360 crank. they appear to only be available in std and .010 sizes, but I may be reading it wrong. edit: they are listed as 3/4 groove...still... Last edited by poboyengineering; 07/08/13 04:37 PM. It may be ugly, but it sure is slow. Girls comb their hair in rear view mirrors and the boys try to look so hard....

Re: half groove bearing or full groove [Re: BeeSuper] #1464802 07/08/13 04:51 PM 07/08/13 04:51 PM
Joined: Nov 2004 Posts: 1,708 S. Il. U.S.A. 5spdcuda top fuel
5spdcuda top fuel Joined: Nov 2004 Posts: 1,708 S. Il. U.S.A.	I would agree with Mitch that the 3/4 groove bearings are probably ideal. That said, I have used a lot of full groove mains and I've yet to see anyone have a main bearing problem that could be attributed to their use. I have seen people lose rod bearings due to insuffient oil. Given a choice between 1/2 groove and full groove, I'll use full groove everytime.

Re: half groove bearing or full groove [Re: Mopar Mitch] #1464803 07/08/13 05:20 PM 07/08/13 05:20 PM
Joined: Aug 2003 Posts: 43,161 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,161 Bend,OR USA	Quote: What is actually the very best (for racing/hi-perf) is to use 3/4 grooved bearings... the top should be fully grooved; the bottom should be grooved at the outer edges ~25% per side so to allow the bottom to be solid. That design is proven to provide the bottom thrust face being solid to absorb the greatest amount of force. I think Federal-Mogul (via their "Speed Pro" line) sells 3/4 grooved bearings. ("Fully-grooved" is yester-year's technology.) You can call the Federal-Mogul Tech-Line and discuss this with them. I disagree with not oiling the rods full time all the time, especially when revving a motor above 5000 RPM I like and use the Federal Mogul truck full narrow groove main bearings Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: half groove bearing or full groove [Re: Cab_Burge] #1464804 07/08/13 06:17 PM 07/08/13 06:17 PM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	I have used fully groved mains for many years. Never had a bearing problem on any of my engines. Ron

Re: half groove bearing or full groove [Re: 383man] #1464805 07/08/13 06:30 PM 07/08/13 06:30 PM
Joined: Dec 2005 Posts: 4,231 State of retirement 5 52savoy master
52savoy master 5 Joined: Dec 2005 Posts: 4,231 State of retirement	groovy.... but you and Cab are yester-year's technology

Re: half groove bearing or full groove [Re: 52savoy] #1464806 07/08/13 07:36 PM 07/08/13 07:36 PM
Joined: Oct 2003 Posts: 11,684 W. Kentucky justinp61 I Live Here
justinp61 I Live Here Joined: Oct 2003 Posts: 11,684 W. Kentucky	Quote: groovy.... but you and Cab are yester-year's technology I didn't think I was old but must be. I use full grove mains also.

Re: half groove bearing or full groove [Re: BeeSuper] #1464807 07/08/13 07:59 PM 07/08/13 07:59 PM
Joined: Aug 2003 Posts: 1,313 Charlotte, NC L LSP pro stock
LSP pro stock L Joined: Aug 2003 Posts: 1,313 Charlotte, NC	I haven't had any issues using 1/2 groove mains in anything, and have used 3/8 groove mains in a 8200 rpm build with .680" wide rod bearings.

Re: half groove bearing or full groove [Re: LSP] #1464808 07/08/13 08:52 PM 07/08/13 08:52 PM
Joined: Dec 2006 Posts: 3,395 Pa Hot 340 master
Hot 340 master Joined: Dec 2006 Posts: 3,395 Pa	I often wonder if half groove bearings have any part in new flat tappet cam failures.

Re: half groove bearing or full groove [Re: Hot 340] #1464809 07/08/13 09:01 PM 07/08/13 09:01 PM
Joined: Jan 2003 Posts: 4,616 Kissimmee Fl. D dusturbd340W5 master
dusturbd340W5 master D Joined: Jan 2003 Posts: 4,616 Kissimmee Fl.	Quote: I often wonder if half groove bearings have any part in new flat tappet cam failures. on a stock block the lifters get oil before the crank so I would say no. and I have never used any thing but half groove bearings and never had any problems from it. 70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4

Re: half groove bearing or full groove [Re: dusturbd340W5] #1464810 07/08/13 09:41 PM 07/08/13 09:41 PM
Joined: Dec 2006 Posts: 3,395 Pa Hot 340 master
Hot 340 master Joined: Dec 2006 Posts: 3,395 Pa	Quote: Quote: I often wonder if half groove bearings have any part in new flat tappet cam failures. on a stock block the lifters get oil before the crank so I would say no. and I have never used any thing but half groove bearings and never had any problems from it. Im speaking in respect of the cam getting less oil flung on it because the rods oil half as much.

Re: half groove bearing or full groove [Re: 52savoy] #1464811 07/08/13 09:54 PM 07/08/13 09:54 PM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	Quote: groovy.... but you and Cab are yester-year's technology Oh well it worked years ago and it still works for me now. Ron

Re: half groove bearing or full groove [Re: 383man] #1464812 07/09/13 07:35 PM 07/09/13 07:35 PM
Joined: Jan 2003 Posts: 6,591 Canton, Ohio S Sport440 master
Sport440 master S Joined: Jan 2003 Posts: 6,591 Canton, Ohio	I feel our mopars have some rod bearing starvation issues. Narrow full grooves help fix that IMO. Sure a 3/4 or half groove bearing might be better for the Crank itself. But I feel the Narrow full grooves are fine. Its more important to feed the rods then worry about a little loss surface area on the bearing for the crank. So for me its the Narrow Full groove bearing all the way.

Re: half groove bearing or full groove [Re: 52savoy] #1464813 07/09/13 10:05 PM 07/09/13 10:05 PM
Joined: Aug 2003 Posts: 43,161 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,161 Bend,OR USA	Quote: groovy.... but you and Cab are yester-year's technology It must be great being you , a newbie with so much expereince Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: half groove bearing or full groove [Re: Cab_Burge] #1464814 07/11/13 02:16 AM 07/11/13 02:16 AM
Joined: Jun 2007 Posts: 103 NEW JERSEY BIGSPEED member
BIGSPEED member Joined: Jun 2007 Posts: 103 NEW JERSEY	Full grooved main bearings allow the hydrodynamic oil wedge between the journal and bearing to deplete,Nascar cup Nhra Prostock and Comp elim. most not using full grooved bearings or crossdrilled cranks.Bill C. Ceralli Racing Engines & Checkered Flag Machine Racing engines , CNC porting & induction development http://www.checkeredflagmachine.net/

Re: half groove bearing or full groove [Re: BIGSPEED] #1464815 07/12/13 07:57 AM 07/12/13 07:57 AM
Joined: Mar 2003 Posts: 1,629 pa 572charger top fuel
572charger top fuel Joined: Mar 2003 Posts: 1,629 pa	fm 119m in my hemi !!!! 606 hemi pump gas best 9.60 at 142mph on motor 05 hemi daytona 1500 go-mango 4wd quadcab 2007 hotrod mag pump gas drags runner up, roadkill nights dodge big tire winner 2018 2019 back to back

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