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401 Roller Motor Update |
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Rebel Machine
AMC Addicted Joined: Jul/03/2007 Location: Western Il Status: Offline Points: 5118 |
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Posted: Aug/05/2012 at 5:47pm |
I've been having problems with oil pressure since installing the roller
cam & lifters. After the engine warms up the oil thins and pressure
drops to about 12 lbs at idle. Under heavy acceleration the pressure
drops around 30 lbs and flutters around. This tells me too much oil is
getting thrown around and leaving the pan dry. When the engine is cold
this doesn't happen.
I removed the roller lifters today. Got less than 500 miles on them. They're definitely loose in the bore. They all look like this: Put my cheapo dial caliper on it and an unused lifter that came out of a 290 last winter. Does anyone make these roller lifters 0.905"? -Steve- |
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whizkidder
Supporter of TheAMCForum Joined: Mar/03/2008 Location: North Georgia Status: Offline Points: 2972 |
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I've heard Johnson will machine a set to your specs.
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Ron Frost
marne1ancient @ gmail.com 910 nine two two 0563 "There is no limit to what a man can do, so long as he does not care a straw who gets credit for it. Charles Montague |
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Rebel Machine
AMC Addicted Joined: Jul/03/2007 Location: Western Il Status: Offline Points: 5118 |
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Yeah... I've spent too much $$$ on this roller cam nightmare already. Cordova is coming up so I've got a decision to make:
1) New high $$$ roller lifters.
2) Go back to a flat tappet cam.
3) Take The Machine instead of the AMX and tear down the 401 this winter.
-Steve-
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SKeown
AMC Addicted Joined: Jul/30/2009 Location: Texas Status: Offline Points: 3085 |
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Using a dial bore guage (begged, borrowed or stolen) measure all the lifter bores, calculate an average, then call Joe Lewis at Johnson Lifters. He'll make some that will correct you're problem. A number of people have taken that course of action and been happy with the outcome.
SKeown
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Grey Ghost
AMC Apprentice Joined: Oct/11/2009 Location: Route 66 Il. Status: Offline Points: 158 |
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I put the Johnson solid rollers in my 401 oil pressure has been great since.
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Lets go racing!
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Rebel Machine
AMC Addicted Joined: Jul/03/2007 Location: Western Il Status: Offline Points: 5118 |
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SKeown,
Thanks for the info. I'd rather not tear this engine down a second winter in a row. If I can get some roller lifters that fit correctly that would be the path of least resistance.
Will they use the same length pushrod as the Comp lifters?
-Steve-
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bigbadgreen
AMC Addicted Joined: Jan/07/2009 Location: WI Status: Offline Points: 1770 |
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Isnt Crane making them again?
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Ontario Automotive
AMC Fan Joined: Aug/02/2012 Location: callander on Status: Offline Points: 3 |
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just a note on roller lifters on 401 engines The problem exsist with one side of the engine getting more oil then the other side so what I have done was to bore and install new bronze bushings in the lifter gallerys with smaller holes and on the left side of the engine i ran smaller hole pushrods to even out the oil to both sides works perfect price wasn`t to bad either we dyno it and pulled 650 horsepower out of it with good oil pressure we went 060 over on flat top pistons with aluminum rods X heads and a good camshaft with a herman lewis tunnel and two 750 cfm carbs
works very well total build cost about $15000 but when we go to the drag strip people do notice a we have it mounted in a 1969 scramble with 7000 original miles been a race car since 1972 lots of fun so don`t hesitate to email if you need help Thanks Karl
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SKeown
AMC Addicted Joined: Jul/30/2009 Location: Texas Status: Offline Points: 3085 |
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Bushing the lifter bores with smaller oil feed holes is what I did, but that's a major undertaking compared to getting properly fitted Johnson lifters. You can easily restrict the oil flow going to the driver's side bank by using a .090 orifice flow 1/4" plug behind the 3/8" galley plug.
SKeown
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Rebel Machine
AMC Addicted Joined: Jul/03/2007 Location: Western Il Status: Offline Points: 5118 |
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What pushrods are you guys using with the Johnson lifters? Are they the stock length?
-Steve-
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