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Drilling oil holes in a 216 crankshaft
#1337446 Fri Dec 13 2019 12:11 AM
Joined: Feb 2004
Posts: 20,608
H
Boltergeist
One of the really interesting things about buying my crankshaft grinder was where I got it- - - -King's crankshafts in Denver North Carolina. King's is a 2-generation family business, one that's been whittling billet crankshafts out of chunks of solid steel for close to 50 years. They start with a round chunk of steel over a foot in diameter, program a CNC mill to the right specifications, and end up with a custom crankshaft for a NASCAR engine, a tractor puller, or even an experimental airplane engine! Of course, years ago, all this stuff was done with a lathe and a hand-cranked milling machine, and then a manual crankshaft grinder! I bought one of their "retired" machines.

I brought up the subject of drilling oil holes in a spray-oiler crankshaft, and the owner of the business says it's something he could do, as they drill oil passages in the billet shafts they make. The first one would be a little expensive, as he would have to do all the CNC programming to make the holes come out in the right places, but others would cost considerably less once the machine knows what to do. If a few people wanted to chip in and split the costs, it might be worth considering, assuming there's enough interest to make it worth the gentleman's time to do the programming. He's definitely one of the good guys in the custom crankshaft business.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Drilling oil holes in a 216 crankshaft
Hotrod Lincoln #1337804 Mon Dec 16 2019 02:28 AM
Joined: Jul 2014
Posts: 209
1
Shop Shark
I read about guys doing this years ago (maybe it was McGurk) but I think it was on a one-off basis and I don't remember what motive made it worthwhile. I'd be interested to know the rationale. Racing rules? Vintage racing?


51 3800 PU, 55 235 (w/cam, headers, 2 carbs, MSD ign.), SM420 & Brown-Lipe 6231A 3spd aux. trans, stock axles & brakes. Owned since 1971.
Re: Drilling oil holes in a 216 crankshaft
Hotrod Lincoln #1337813 Mon Dec 16 2019 03:11 AM
Joined: Feb 2004
Posts: 20,608
H
Boltergeist
It was done along with machining the connecting rods for insert bearings to provide full pressure lubrication to the rods and eliminating the dippers, troughs, and spray-oiling system. The spray holes in the rod caps are plugged and the dippers are removed. Fitting the Melling M-45 oil pump for the 235 and reworking the oil pickup plumbing a little would also be a good idea to increase oil volume. I'm working on the details of putting an increased-stroke 235 crankshaft in a 216 block, along with several other modifications to create a 266 cubic inch inline six with full pressure oiling that looks exactly like a 216 from the outside.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Drilling oil holes in a 216 crankshaft
Hotrod Lincoln #1337818 Mon Dec 16 2019 04:23 AM
Joined: Oct 2006
Posts: 1,848
B
Shop Shark
crower cams, crankshaft division already has the program, they did it on my crankshaft, mostly because the programmer didn't have anything to do. however they centered the rear main bearing hole, mostly because I didn't tell them otherwise, but that would be an easy fix. They only charged me like $150

Re: Drilling oil holes in a 216 crankshaft
Hotrod Lincoln #1338126 Tue Dec 17 2019 08:30 PM
Joined: Feb 2011
Posts: 1,007
T
Shop Shark
I'm out of practice, but I could still program that in about 1 hour. The setup would take longer than programming it.


Ret, Machinist , Industrial Engine
Engine specialist
Re: Drilling oil holes in a 216 crankshaft
Hotrod Lincoln #1356960 Fri Apr 24 2020 10:52 PM
Joined: Sep 2019
Posts: 2
M
Diy
hotrod lincoln- how did it all work out? Did you get the full pressure stroked 216 you were looking for? How does it run? Worth the cost? I'm looking to full pressure the original 216 in my '49.


1949 Chevy 3600 w/ 216 and sm420 floor shift
Re: Drilling oil holes in a 216 crankshaft
Hotrod Lincoln #1356993 Sat Apr 25 2020 01:35 AM
Joined: Feb 2004
Posts: 20,608
H
Boltergeist
I'm still accumulating parts and the crank grinder isn't in operating shape yet. The Chicken Little virus "panic-demic" ("The sky is falling!") has slowed down my ability to hire some of the grunt labor it's going to take to get the shop set up the way I want it. If things work out as planned, I'm going to have a "216" looking engine with 260+ cubic inches, 9:1 compression or so, with full pressure oiling and a leakproof rear main bearing seal. I'm going to do some very stressful dyno testing on the prototype engine to see if it will stay together under hard use. As with all high performance modifications, there's always the possibility that I'll end up with a very expensive boat anchor!

The 55-62 year 235 crankshaft that I'm using needs some pretty extensive modifications- - - -the thrust bearing area of the shaft needed to be machined wider so it will fit the 216 block, and about 1/2" had to be machined off the counterweights so the slightly shorter NASCAR connecting rods don't cause the piston skirts to hit the crankshaft. As soon as the crank grinder is in operation, I'll be able to do the finish work on the shaft. I'm also reboring the 216 block 60 thousandths and using standard bore 235 aluminum pistons instead of the cast iron 216 pistons. Along with the lighter weight connecting rods, that will make for a big reduction in the reciprocating weight.

Bore: 3 9/16"
Stroke: 4 3/8"
Cubic inch displacement: 262.25

This should be quite a "sleeper 216" if I manage to get all my ducks in a row!
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Drilling oil holes in a 216 crankshaft
Hotrod Lincoln #1357021 Sat Apr 25 2020 03:20 AM
Joined: Mar 2010
Posts: 9,309
5
Master Gabster
What are you expecting in terms of torque as compared to a 261?
Looks like you are making a long stroke 235.

Re: Drilling oil holes in a 216 crankshaft
Hotrod Lincoln #1357025 Sat Apr 25 2020 03:39 AM
Joined: Feb 2004
Posts: 20,608
H
Boltergeist
It's bound to be considerable, but until I can log some dyno time, anything I come up with would be a SWAG at best. I can do the same thing with a 235 block, but it would require about 1/8" to be milled off the top of the block to get the piston deck height right. The 216 is shorter, and there's the added advantage of having a "Sneaky Pete" engine that can be made to appear just like a 216 from the outside. The counterweights would still have to be turned down, regardless of which block I start with.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Drilling oil holes in a 216 crankshaft
Hotrod Lincoln #1357059 Sat Apr 25 2020 02:13 PM
Joined: Mar 2019
Posts: 839
G
Shop Shark
Hmmm, whats da plan for the exhaust manifold, intake and carb, if stock looking is the goal?

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