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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
Show Parts for Model:

52 Oliver 77 cubic inches

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Curt Courtney

02-18-2014 13:05:36
173.118.159.69



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How would I figure how many cubic inches would a 77 with 3/78 bore would be




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Curt Courtney

02-21-2014 12:43:13
173.155.244.81



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 Re: 52 Oliver 77 cubic inches in reply to Curt Courtney, 02-18-2014 13:05:36  
So wouldnt 880 valves be good for this set up since the 880 had larger bore than the 770 and 550?



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Curt Courtney

02-20-2014 15:03:41
173.155.244.81



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 Re: 52 Oliver 77 cubic inches in reply to Curt Courtney, 02-18-2014 13:05:36  

Thank you everyone Lots of good info I think I am leaning towards doing work to the head, shaving and bigger valves just have to figure out what valve to use I am posting a picture of the tractor

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dboll

02-20-2014 16:38:41
72.251.115.90



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 Re: 52 Oliver 77 cubic inches in reply to Curt Courtney, 02-20-2014 15:03:41  
use the 550 valves as suggested,we put a set in a 77 head



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Curt Courtney

02-20-2014 16:47:13
173.155.244.81



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 Re: 52 Oliver 77 cubic inches in reply to dboll, 02-20-2014 16:38:41  
550 for both intake and exhaust?



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dboll

02-21-2014 17:32:38
72.251.115.208



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 Re: 52 Oliver 77 cubic inches in reply to Curt Courtney, 02-20-2014 16:47:13  
yes and it was a 770 head not a 77, sorry for the typo



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Curt Courtney

03-01-2014 12:30:58
173.113.186.206



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 Re: 52 Oliver 77 cubic inches in reply to dboll, 02-21-2014 17:32:38  
Know where to find reasonable priced 550 valves



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dboll

02-18-2014 17:34:17
72.251.115.140



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 Re: 52 Oliver 77 cubic inches in reply to Curt Courtney, 02-18-2014 13:05:36  
265- I don't like over square engines for tractors unless intended for higher rpm's.



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dblair

02-18-2014 14:19:16
67.172.202.153



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 Re: 52 Oliver 77 cubic inches in reply to Curt Courtney, 02-18-2014 13:05:36  
here's an easy site to figure your stuff on . http://www.race-cars.net/calculators/compression_calculator.html

if you got that compression up to 11 to 1 you could get 75 hp . it would take a 25 cc dome on your piston though .
This post was edited by Dblair at 14:26:59 02/18/14.



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Curt Courtney

02-18-2014 13:45:33
173.118.159.69



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 Re: 52 Oliver 77 cubic inches in reply to Curt Courtney, 02-18-2014 13:05:36  
Thanks everyone I came up with 265 so with stock crank cam and no headwork do you think this tractor would make 50 to 55 horse



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schim

02-18-2014 14:20:10
74.218.67.3



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 Re: 52 Oliver 77 cubic inches in reply to Curt Courtney, 02-18-2014 13:45:33  
That set up would give you 265.34861718750005 cubes. I had a 77 with 55 horse. Stock stroke, 3 3/4" bore, stock cam, stock carb, stock valves, and stock RPM's. But it had 80 thousandths off the head. Ran premium fuel. Dont bore the sleeves or block or whatever youre doing (unless its already done.) Get murphys roller rockers and intake manifold. Shave the head .0100. 1550 or bigger carb with 770 valves and I bet you will have 65-70 horse. That's pretty good for no machining to the crank or block.

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J. Schwiebert

02-18-2014 16:13:21
209.173.169.187



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 Re: 52 Oliver 77 cubic inches in reply to schim, 02-18-2014 14:20:10  
Why not use 550 valves?



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Curt Courtney

02-19-2014 11:11:10
173.113.232.119



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 Re: 52 Oliver 77 cubic inches in reply to J. Schwiebert, 02-18-2014 16:13:21  
why do you say 550 valves instead of 770 valves thank you



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J. Schwiebert

02-19-2014 13:12:27
209.173.169.187



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 Re: 52 Oliver 77 cubic inches in reply to Curt Courtney, 02-19-2014 11:11:10  
Simple: Later (3.625 Bore) 550 engines have larger exhaust valves. I would need to look up the intake valves.



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oliver90owner

02-18-2014 13:20:55
92.1.34.150



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 Re: 52 Oliver 77 cubic inches in reply to Curt Courtney, 02-18-2014 13:05:36  
Stroke is the same, so just calculate it!

Pi r squared h is the volume of a cylinder.

Or pi d squared/4 times h

Pi =3.146, r = radius, d = diameter, and h =stroke.

RAB



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1970-1655

02-18-2014 13:19:04
166.147.104.164



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 Re: 52 Oliver 77 cubic inches in reply to Curt Courtney, 02-18-2014 13:05:36  
Bore x bore x .7854 x stroke x # of cylinders.

Example: 4" bore, 4" stroke, 6 cylinders
4 x 4= 16
16 x .7854= 12.5664
12.5664 x 4 (stroke)= 50.2656
50.2656 x 6 (# of cylinders) = 301.5936



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Curt Courtney

02-19-2014 10:44:43
173.113.232.119



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 Re: 52 Oliver 77 cubic inches in reply to 1970-1655, 02-18-2014 13:19:04  
The block is already bored thinking of shaving the hed and bigger valves but I might just runit for a season as is to see what kind of power i have I am wanting to pull div II 4000 and 4500



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Dick W.

02-19-2014 16:25:37
174.54.58.169



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 Re: 52 Oliver 77 cubic inches in reply to Curt Courtney, 02-19-2014 10:44:43  
I run the 3.75x3.75 in my 66. It is a super 55 engine with the late 550 head, manifolds and carb. The head is shaved .100 and everything else is stock. It pulls really well most of the time. You can see it pulling on youtube. 2014 Pa Farm Show Antique tractor pull - YouTube. It won the 3,000 and got 2nd in the 4,000. Lots of fun!! I use Sunoco 89 pump gas. I don't have the PTO in it so I don't know what the HP is, guessing more than 50 @ 2600RPM. Your 77 should be 60 or better at a lower speed with 3.875.

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Curt Courtney

02-19-2014 16:31:29
173.140.63.239



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 Re: 52 Oliver 77 cubic inches in reply to Dick W., 02-19-2014 16:25:37  
60 without doing head work or after?



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Dick W.

02-19-2014 18:50:24
174.54.58.169



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 Re: 52 Oliver 77 cubic inches in reply to Curt Courtney, 02-19-2014 16:31:29  
With the big pistons the head work will make it much better. Or get a late 770 or 1550 head for it. I'll try to take a look in my Oliver manual to find the valve sizes. The later manifolds and carb might be a good thing for that engine also. The later upper end really awakened my 4 cylinder. I worked on the carb this year to get rid of a lean problem on a long hard low RPM pull. I like it now, good torque at lower RPM.

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