Full-Time or Part-time Rocker Oiling
#3137530
04/12/23 10:18 PM
04/12/23 10:18 PM
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Joined: Dec 2012
Posts: 257 Alberta
440_Offroader
OP
enthusiast
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OP
enthusiast
Joined: Dec 2012
Posts: 257
Alberta
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So, I've been collecting parts for my 512B engine, and purchased some Mancini Racing Rocker arms. I kinda slipped up, and thought these had needle bearing fulcrums for some reason. Um, they don't, and are just aluminum on shaft configuration. I was going to leave it with the part time oiling with needle bearings, but now I'm wondering if I need to change up to full time oiling for the solid rockers? These rockers have an orfice, to spray oil onto the adjuster ball, but not the roller/spring side. Not sure if this will sway which way I should go with the oiling? The engine is going into a 70's truck and will only be on the street. Keeping the rpm's low at around 5500rpm max. Probably run a HFT, maybe a solid, but not doing a roller, so spring pressures won't be crazy. Found lots of good information on how to do the full time oiling, but nothing concrete on when to do it. I'm leaning towards full time, but if it's not required, I won't bother. Any suggestions would be awesome! Thanks.
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Re: Full-Time or Part-time Rocker Oiling
[Re: AndyF]
#3137584
04/13/23 01:16 AM
04/13/23 01:16 AM
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Joined: Dec 2012
Posts: 257 Alberta
440_Offroader
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Thanks guys, lots of good info, and more to think about. Andy, I was figuring, there were probably lots of street type deals running factory oiling on bushed rockers, MRE, or Hughes rockers. It still bugs me to be robbing oil from the #4 main. I do have the #4 main drilled to the lifter galley to the 9/32", and will be running a HV pump with a stock relief spring too. That might be OK? Stanton, your points are very valid, and I don't imagine there is much material for the plugs to grab onto. If the deal goes south, then the block is kinda pooched too. My block also has a weird ridge that runs across the valley, right where I'd need to drill. I'd have to grind that down to drill straight in the intersect area. I do like the idea of not stealing oil from the #4 main. Cab, I see you've done the #4 cam bearing groove many times with success (with. 040" restrictions), so that makes it more reassuring. DrCharles, that is good to know about no restrictors for your grooved cam. I haven't measured the clearance between the shafts and these rockers, but I figure they should only be. 001" or so. These rockers do have the squirting orifice that lube the pushrod cup though. Not sure if that would bleed too much oil up top?
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Re: Full-Time or Part-time Rocker Oiling
[Re: 451Mopar]
#3137631
04/13/23 05:22 AM
04/13/23 05:22 AM
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Joined: Aug 2005
Posts: 760 Southington Ct.
turbobitt
super stock
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super stock
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Southington Ct.
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I like the idea of a fully grooved cam for full time oiling because it enables the option to restrict it at the rocker gear if desired.
AG.
1970 Challenger w/572 Hemi street car and my pride and joy.
1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno.
1976 Cee Bee Avenger Jet Boat - 460 Ford powered.
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Re: Full-Time or Part-time Rocker Oiling
[Re: Cab_Burge]
#3138136
04/15/23 08:44 AM
04/15/23 08:44 AM
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Joined: Oct 2005
Posts: 8,874 Ontario, Canada
Stanton
Don't question me!
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Don't question me!
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Posts: 8,874
Ontario, Canada
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enables the option to restrict it at the rocker gear if desired. Well I for one would like to know how you do that - restrict it at rocker gear ?!?!
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Re: Full-Time or Part-time Rocker Oiling
[Re: jwb123]
#3138160
04/15/23 10:04 AM
04/15/23 10:04 AM
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Joined: Mar 2003
Posts: 2,509 PA
moparacer
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I would think how much spring pressure you are going to run would be a major factor. But I will tell you I ran the edelbrock victor jr. heads with Hughes rockers which have no rollers, .750 lift cam 250 on the seat and 650 open pressures for many years with no issues at all with the standard oiling. I never had any wear or breakage issues. Now if you are going to run much more aggressive spring pressures then maybe you may need more oiling. I had a world products block but used the same rockers for 3 seasons with a stock block. One issue I would think about is if you would break a rocker you have needle bearings in your engine and the bushed you do not. I always preferred the bushed rocker on a good shaft. I run 800 over the nose and I went back to bushed rockers and lifters.
67 Barracuda street/bracket car 11.27-119 68 Dart 502 BB 8.70s-152 414 cid SB Dragster 7.65-174
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Re: Full-Time or Part-time Rocker Oiling
[Re: jwb123]
#3138195
04/15/23 12:26 PM
04/15/23 12:26 PM
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Joined: Dec 2012
Posts: 257 Alberta
440_Offroader
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I was lucky to get the rockers with no needle bearings. I thought that these MRE rockers used needle bearings for some reason. After finding they were indeed a solid/ bushed style, that's when the timed oiling seemed maybe inadequate to me. By what many of you say, it would have been fine, but this will make me sleep better at night. I haven't spec'd a cam or springs for this yet, but it's not going to be very aggressive. Stanton, I didn't put any restriction in. I can shorten the line into the back of the block to fit an orfice fitting if need be. After the engine is together, I will prelube it and see how the flow to the rockers is. I used 1/4" stainless tubing with an ID of about 0.140". Cab, it didn't actually take to long to do, maybe a little over an hour. I probably took more time pondering the idea of drilling into my block! Also, tapping into the oil crossover at the back of the oil gallery. I had not heard of anyone doing it that way before, but I thought it was a good idea. Me and my ideas!?!?! BTW, the casting is about 0.300" thick, before you hit the oil gallery at the back. The reason I did it this way, as I can revert back to factory oiling by only removing the intake manifold, and plugging the 1/8" holes. I doubt I will change to a different style rocker, but you never know. I am going to leave my #4 cam bearing in the stock orientation. I would have the timed oiling, and full time oiling happening simultaneously, but the pressures should be similar at the intersection point. I don't see a problem, but maybe someone can shed some insight on this? I seem to over analyze everything, not able to KISS it. Thanks guys, your input is appreciated. What works with everyone's specific setups is always good knowledge.
Last edited by 440_Offroader; 04/15/23 12:29 PM.
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Re: Full-Time or Part-time Rocker Oiling
[Re: Stanton]
#3138254
04/15/23 04:07 PM
04/15/23 04:07 PM
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Joined: Aug 2003
Posts: 43,202 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,202
Bend,OR USA
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Last edited by Cab_Burge; 04/15/23 04:08 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Full-Time or Part-time Rocker Oiling
[Re: Cab_Burge]
#3138277
04/15/23 05:27 PM
04/15/23 05:27 PM
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Joined: Jan 2003
Posts: 1,760 Windsor, ON, Canada
Diplomat360
top fuel
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top fuel
Joined: Jan 2003
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The drill and tap in the heads is the approach I've taken with my W2 Econo's setup and Harland Sharp roller needle rocker arms. HS specifically advised to limit the oil flow to the rockers, but not knowing what the right fit is for a street ride I figured I would play it safe by prepping for adjustability: if too much oil flows, I'll scale back in the size of the orifice, and all it takes is pulling the rocker arm shafts off and replacing the plug, as opposed to having to yank the heads off the block!
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Re: Full-Time or Part-time Rocker Oiling
[Re: crackedback]
#3138546
04/16/23 06:53 PM
04/16/23 06:53 PM
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Joined: Oct 2005
Posts: 8,874 Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 8,874
Ontario, Canada
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You can buy allen head brass set screws Why brass ??? They're harder to find and steel ones work just fine! A .060 or .062 (1/16") orifice is a good starting point.
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