312 Stock Car Engine


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By RumbleFish - 14 Years Ago
Okay guys I pick up a 312 engine that was built by Euclid Ford in Ohio for a guy by the name of Bob James who raced the round and round track in NE Ohio in the mid to late 50's and it was last ran on the streets in '59.



The setup was as told by the guy I got it from it had been bored and stroked to 347?(341) and ran Hilborn Injection with a Mag. I was one month late on getting the hole dealSad but have everything else. Jahns domed pistons ECZ rods, crank, cam and tappets, head and rocker assembly ect.... The piston are big, now I do not have a set of Mics. so I measure across and got 3 15/16"+/-.



I have a couple questions...........first the Rod caps are not number and I'm worried about the wrong cap being on the wrong rod. Second is the bearings size, it is not stamped on the bearing. The bearing number is FoMoCo D.A.B. 11 59 EBV-6211 can anyone tell me what size they are and what to do about the caps please.



Thanks for your time,

Brian
By Ted - 14 Years Ago

You’ll need to measure the crankshaft journals.  2.1884” is standard size for the rods and 2.6244” is standard size for the 312 mains.  Although mics would be nice for this, a dial caliper will be accurate enough to determine if the crankshaft is either standard size or has been ground undersize.  It would help to put up the decimal equivalent or the mic reading of the bores to get an accurate feel for what those are.  The 3 15/16” value is a bit ambiguous.

 

As far as stroke goes, the easiest method on your end would be to measure the distance a piston is sitting in the bore at both TDC and BDC and the difference between these would be the stroke.

 

Then doing the math using the bore and stroke values would give you the real cubic inch displacement.

Bore X Bore X Stroke X 6.2832 = cubic inch for an eight cylinder engine.
By Ted - 14 Years Ago

I’ll add that this block is likely a good candidate for sonic checking.  If the bore is indeed ~3.937”, then it may be marginal in certain cylinder wall areas depending upon the core shift that was originally residing in the block.

By RumbleFish - 14 Years Ago
Ted (5/22/2011)

You’ll need to measure the crankshaft journals. 2.1884” is standard size for the rods and 2.6244” is standard size for the 312 mains. Although mics would be nice for this, a dial caliper will be accurate enough to determine if the crankshaft is either standard size or has been ground undersize. It would help to put up the decimal equivalent or the mic reading of the bores to get an accurate feel for what those are. The 3 15/16” value is a bit ambiguous.

As far as stroke goes, the easiest method on your end would be to measure the distance a piston is sitting in the bore at both TDC and BDC and the difference between these would be the stroke.

Then doing the math using the bore and stroke values would give you the real cubic inch displacement.Bore X Bore X Stroke X 6.2832 = cubic inch for an eight cylinder engine.





Thanks Ted!! I will get some additional measurements and post them today.



Thanks again for your time!!!

Brian
By Ted - 14 Years Ago
RumbleFish (5/22/2011)
I have a couple questions...........first the Rod caps are not number and I'm worried about the wrong cap being on the wrong rod
Surprised that the rods aren’t numbered but they could have been purchased new over the counter which would explain the non-numbering.  Assuming that the rods and the caps are apart now, then it’s just going to be a slow process of putting caps on the rods and by a process of elimination, getting them matched back up as their respective pairs.  Tang to tang so that takes care of part of it and then it’s a matter of matching up sides and bevels/chamfers between the caps and the rods until they are all matched back up.

 

If the caps are currently on the rods, then double checking each rod big end hole for roundness with a mic once they are torqued would be prudent.

By RumbleFish - 14 Years Ago
Ted (5/23/2011)
RumbleFish (5/22/2011)
I have a couple questions...........first the Rod caps are not number and I'm worried about the wrong cap being on the wrong rod
Surprised that the rods aren’t numbered but they could have been purchased new over the counter which would explain the non-numbering. Assuming that the rods and the caps are apart now, then it’s just going to be a slow process of putting caps on the rods and by a process of elimination, getting them matched back up as their respective pairs. Tang to tang so that takes care of part of it and then it’s a matter of matching up sides and bevels/chamfers between the caps and the rods until they are all matched back up.

If the caps are currently on the rods, then double checking each rod big end hole for roundness with a mic once they are torqued would be prudent.







Ted, They were all out and tagged when I got them with the cylinder number only, not stamped on the cap or rod just tagged. They do look new but they all have bearings in them and you can see that they had been turned on the crank at some point. I will post some pictures and measurements some time this week.



Thanks,

Brian