Posted By: Hot 340
Hemi #4 cam groove (GEN 2) - 02/28/15 11:15 PM
We got a new comp cam, small solid roller with no groove in the #4 journal. Is there a good reason why it isnt there? Or should I put it in?
Hemi #4 cam groove (GEN 2)
Posted By: rickseeman
Re: Hemi #4 cam groove (GEN 2) - 03/01/15 04:44 AM
I wouldn't put it in.
Posted By: Cab_Burge
Re: Hemi #4 cam groove (GEN 2) - 03/01/15 06:34 AM
I make sure all my roller cam motors oil the rockers full time 
I will restrict them as needed 
Oiling the rockers full time helps a bunch on cooling the valve springs 
I will restrict them as needed Oiling the rockers full time helps a bunch on cooling the valve springs
Posted By: Hot 340
Re: Hemi #4 cam groove (GEN 2) - 03/01/15 07:09 PM
Quote:You wouldnt put the cam in or the groove in?
I wouldn't put it in.
Posted By: Hot 340
Re: Hemi #4 cam groove (GEN 2) - 03/01/15 07:12 PM
Quote:Cab, why open it up just to restrict it back down? How do you restrict it? Carb jet tapped into galley somewhere?
I make sure all my roller cam motors oil the rockers full time
Posted By: astjp2
Re: Hemi #4 cam groove (GEN 2) - 03/01/15 07:17 PM
To maintain oil pressure to the bearings...
Posted By: Hot 340
Re: Hemi #4 cam groove (GEN 2) - 03/01/15 07:25 PM
Quote:I get that. Im just asking why open it up to close it back off. Does not having the groove starve the valve train and grooving the cam over flood it?
To maintain oil pressure to the bearings...
Posted By: RUNCHARGER
Re: Hemi #4 cam groove (GEN 2) - 03/01/15 08:35 PM
Hence the jet to control the amount.
Sheldon
Sheldon
Posted By: rickseeman
Re: Hemi #4 cam groove (GEN 2) - 03/01/15 09:37 PM
Quote:Quote:You wouldnt put the cam in or the groove in?
I wouldn't put it in.
Wouldn't put in a cam without the groove. Hemi's have the groove. Have had for 50 years. Let's not try to make this harder than it is. Hemi's have the groove. If your cam doesn't, have them make you one right.
Posted By: Hot 340
Re: Hemi #4 cam groove (GEN 2) - 03/01/15 09:46 PM
Quote:My thinking too. ThanksQuote:Quote:You wouldnt put the cam in or the groove in?
I wouldn't put it in.
Wouldn't put in a cam without the groove. Hemi's have the groove. Have had for 50 years. Let's not try to make this harder than it is. Hemi's have the groove. If your cam doesn't, have them make you one right.
Posted By: Hot 340
Re: Hemi #4 cam groove (GEN 2) - 03/01/15 10:40 PM
This cam DOES have oil holes through the #4. Did hemi cams use a combination of them both?
Posted By: cknight
Re: Hemi #4 cam groove (GEN 2) - 03/01/15 10:55 PM
The 426 Hemi cams should have both the timed holes in #4 journal, and the groove. Regards, Chase
Posted By: Cab_Burge
Re: Hemi #4 cam groove (GEN 2) - 03/01/15 11:00 PM
Quote:I've seen a old Crane solid roller cam that had both, that is where I got the idea of having all my solid roller cams grooved to oil the rockers full time
This cam DOES have oil holes through the #4. Did hemi cams use a combination of them both?
To answer your other question on restricting the oil to the rocker shafts it depends on which type rocker arms your using and the oil weight and oil pressures in the motor as well as how well the heads drain the oil back to the oil pan On full roller rocker arms I'll use a .040 restrictor on each side, I drill and tap the oil passage in the block to use a #6x32 thread so I can use a #6 brass set screw with a allen head on one end and drill it to the size I want 
You can do the same thing in the head oil passage, which is easeir to change later On a bushed or non bushed(non roller rocker arm) rocker arm set up I'll start with a .080 oil hole in the set screw and see how that works on that motor The new replacement World Mopar iron blocks come with a .040 oil restrictor in them stock
Posted By: JohnRR
Re: Hemi #4 cam groove (GEN 2) - 03/02/15 08:51 PM
Quote:
This cam DOES have oil holes through the #4. Did hemi cams use a combination of them both?
Yes it should have both , take it to a machine shop and have the groove added , not a big deal.
But with that said , Hi RPM Hemis can suffer spinning rod bearings on the rods fed by #4 main. The better thing to do is the block the ports at the cam bearing and make it full time oiling in the lifter valley by feeding the oil passages to the head from the main galleys and then restricing the amount of oil to the head.