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Oil gallery question?????
#1411003 Sun May 23 2021 06:37 AM
Joined: Feb 2004
Posts: 23,644
H
Kettle Custodian (pot stirrer)
Does anybody know the diameter of the oil gallery that runs from the front to back of a late model 235 engine to supply the hydraulic lifters? I'm building a deep-hole drill guide to gun-drill a 216 block for juice lifters, and I'm wondering how big the final cut needs to be. I'm starting with a 1/4" bit and step-drilling to a bigger hole a couple of times.
Jerry


"Freedom's just another word for nothing left to lose"
Kris Kristofferson

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

WAG MORE- - - - - -BARK LESS!
Re: Oil gallery question?????
Hotrod Lincoln #1411016 Sun May 23 2021 12:54 PM
Joined: Mar 2014
Posts: 2,606
J
'Bolter
Looks like 5/8" Jerry. I'll have to check it better later. On the way to early church.


Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
Re: Oil gallery question?????
Hotrod Lincoln #1411035 Sun May 23 2021 02:50 PM
Joined: Feb 2004
Posts: 23,644
H
Kettle Custodian (pot stirrer)
Thanks, Jon! A gallery that big sounds like a bit of overkill with the lifters I'm considering using- - - -each one has a fill hole slightly smaller than 1/16". I'm probably going to go with a passage around 7/16" or maybe 1/2", and an oil pump that can provide almost twice the volume of a standard 216 pump.
Jerry


"Freedom's just another word for nothing left to lose"
Kris Kristofferson

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

WAG MORE- - - - - -BARK LESS!
Re: Oil gallery question?????
Hotrod Lincoln #1411040 Sun May 23 2021 03:25 PM
Joined: Dec 2020
Posts: 59
L
'Bolter
I can measure my 59 235 block oil gallery today.

Re: Oil gallery question?????
Hotrod Lincoln #1411044 Sun May 23 2021 04:08 PM
Joined: Feb 2004
Posts: 23,644
H
Kettle Custodian (pot stirrer)
Thanks! I believe I've figured out how to route some oil lines internally to pressurize the passages I'm drilling, to preserve the illusion that the "216" I'm building is all original. I had considered running external lines to each of the lifter bores, but that would be a dead giveaway that the engine was modified. There's a pretty big oil drain hole from the center of the lifter valley to the crankcase that should be able to accommodate a pressure line without seriously compromising the drain-back from the head. By using a bolt-on drill guide from the front and rear of the block and drilling halfway from each end, I should be able to keep a 12" long drill bit tracking straight through all the lifter bores. I'll be using hydraulic lifters for a MOPAR big block, either flat tappet or rollers, depending on further research and development on cam timing and lift.
Jerry


"Freedom's just another word for nothing left to lose"
Kris Kristofferson

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

WAG MORE- - - - - -BARK LESS!
Re: Oil gallery question?????
Hotrod Lincoln #1411047 Sun May 23 2021 04:37 PM
Joined: Mar 2014
Posts: 2,606
J
'Bolter
I finally got to where I can see better and try some different methods. More like 1/2"...possibly 17/32", Jerry. The soft plug appears to be 5/8" so I'm thinking they did a step-cut with the galley passage more narrow. Not entirely easy to get something in there but using bent pieces of thin metal (hack saw blades), this is what I've come up with...hope it helps.


Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
Re: Oil gallery question?????
Hotrod Lincoln #1411049 Sun May 23 2021 05:24 PM
Joined: Feb 2004
Posts: 23,644
H
Kettle Custodian (pot stirrer)
Yes, that helps immensely. I believe that with a more modern lifter with a lower leakdown rate, and a higher volume oil pump, the gallery can be a smaller diameter than original, but it looks like there's plenty of room for an accurately-drilled 7/16" or 1/2" hole that will intersect all the lifter bores. Thanks again!
Jerry


"Freedom's just another word for nothing left to lose"
Kris Kristofferson

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

WAG MORE- - - - - -BARK LESS!
Re: Oil gallery question?????
Hotrod Lincoln #1411052 Sun May 23 2021 05:33 PM
Joined: Mar 2014
Posts: 2,606
J
'Bolter
I would think either size would be plenty, wouldn't you? Especially if you used the oil pump you were talking about.


Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
Re: Oil gallery question?????
Hotrod Lincoln #1411054 Sun May 23 2021 05:52 PM
Joined: Feb 2004
Posts: 23,644
H
Kettle Custodian (pot stirrer)
Yes, I think so. The early stovebolt hydraulic lifters had a massive leakdown rate and a very low volume oil pump, so drilling a huge passageway seems to me like it was a mistake from the start. I'm beginning to think that converting juice lifter stovebolts to a slightly smaller diameter, later design lifter might be a good idea, even if more radical modifications aren't attempted. Sleeving the lifter bores for the MOPAR lifters isn't a terribly difficult task as long as some accurate machining is done. A good CNC machine could crank out dozens of the sleeves in an hour, once it was programmed correctly, including the oil passage holes.
Jerry


"Freedom's just another word for nothing left to lose"
Kris Kristofferson

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

WAG MORE- - - - - -BARK LESS!
Re: Oil gallery question?????
Hotrod Lincoln #1411056 Sun May 23 2021 06:38 PM
Joined: Mar 2014
Posts: 2,606
J
'Bolter
That would be a good idea from a few different standpoints, Jerry. Cost, build quality, availability, lack of the right oil, for just a few. If an affordable roller cam/lifters were a possibility that would also be interesting. Next you could figure out how to add more main bearings, better rods and a head that could breathe. Or just remove the cam, plug the oil galley and add the cam to the head at the same time...just like Mr. DeLorean did.


Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
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