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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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770 engine rebuild

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Hotrod770

08-06-2007 18:33:47




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Looking to rebuild a 1958 770 gas for some farming and summer pulling. What is the largest sleeve kit available? What are my options to achieve a 4" stroke. What is the highest compression ratio I can run on 87 octane? Where can I find a replacement radiator, stock or upgraded. Any recommended head shops in S. WI?




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ken77

08-08-2007 04:27:38




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 Re: 770 engine rebuild in reply to Hotrod770, 08-06-2007 18:33:47  
i have a friend who stroked his cockshutt 30 and thought he could use it pulling and farming till one day it decided to let loose in the field and a very expesive engine for the scrap man. i would not suggest stroking the crank for a dual purpose tractor i would put oversize pistons and shaving the head and match the in and exh ports on the head and manifolds to the gaskets i have built straight 77s with 3 3/4 pistons and gotten 60+ hp

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Hotrod770

08-06-2007 19:05:55




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 Re: 770 engine rebuild in reply to Hotrod770, 08-06-2007 18:33:47  
I want to increase the bore and the stroke, just looking for options.



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J Schwiebert

08-06-2007 18:40:23




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 Re: 770 engine rebuild in reply to Hotrod770, 08-06-2007 18:33:47  
You asked about sleeves and pistons, but if you stroke it all you ar buying is an expensive set of sleeves as the pistons will not work. Forgot to mention that.



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J Schwiebert

08-06-2007 18:38:55




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 Re: 770 engine rebuild in reply to Hotrod770, 08-06-2007 18:33:47  
Are you thinking 550 valves or bigger? Me I would go 3.625 and gain torque with a longer stroke. It is your checkbook.



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Hotrod770

08-07-2007 10:34:04




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 Re: 770 engine rebuild in reply to J Schwiebert, 08-06-2007 18:38:55  
Could I install a crank out of a 1600?



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770

08-07-2007 18:44:29




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 Re: 770 engine rebuild in reply to Hotrod770, 08-07-2007 10:34:04  
No.



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Hotrod770

08-07-2007 19:16:56




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 Re: 770 engine rebuild in reply to 770, 08-07-2007 18:44:29  
What is the largest bore sleeve kit that I can install? I see 3.75" kits for sale, but some talk about a 3.875" bore? What can I gain in stroke by grinding the stock crank? I would also like to do some head work, port polish, valves? any suggestions? I still want to use this tractor in the field.



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J Schwiebert

08-08-2007 03:28:25




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 Re: 770 engine rebuild in reply to Hotrod770, 08-07-2007 19:16:56  
Just remember a couple of fundamentals. More displacement and you need a larger opening for the fuel/air mixture (valves, cam,etc) to fill that volume. What do you plan to use for rods when you offset grind the crank? Have you talked to a good machine shop? Reinforced the checkbook? Tractor pulling is like racing. Question? How to wind up with a small fortune in winnings? Answer: Start with a larger one.

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Hotrod770

08-08-2007 05:14:28




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 Re: 770 engine rebuild in reply to J Schwiebert, 08-08-2007 03:28:25  
If I had all these questions answered, I would not be writing this thread. I dont want to re-invent the wheel here. I am looking for successful things that others have done. I am not doing any of this for financial gain in pulling, its like any other form of recreation your going to pay to play.



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jpsepp

08-08-2007 08:18:21




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 Re: 770 engine rebuild in reply to Hotrod770, 08-08-2007 05:14:28  
Hot rod I think what J is trying to tell you is either pull it or farm it. This guy is a wealth of knowledge and is old school. I don't even own an oliver but if J said hook a row crop 77 to a 5 bottom plow then im hookin it up. He is just looking out for your best interest. If you want to farm and pull then I suggest a farm tractor and a pulling tractor.



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Hotrod770

08-08-2007 09:44:47




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 Re: 770 engine rebuild in reply to jpsepp, 08-08-2007 08:18:21  
Well I posted this thread for information regarding a rebuild of a 770. I have two other tractors, one that is farm, other is for farming and pulling. All I asked for was what is the largest sleeve kit for that motor? What can I gain by turning down the crank? And any valve suggestions. There is no reason that I cannot increase the HP on this tractor and use it for both. Oliver did it 50 years ago, they just installed these motors in larger frames. I am not looking for practical or financial advice here, just some technical input.

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770

08-08-2007 13:54:31




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 Re: 770 engine rebuild in reply to Hotrod770, 08-08-2007 09:44:47  
suggestions? well..... 3-3/4 overbore, A GOOD port and polish, cam and some carb, manifold work will get you 65 horses. If you want any more, get the wallet out! Just my opinions.....



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Princeton Bill

08-08-2007 13:29:44




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 Re: 770 engine rebuild in reply to Hotrod770, 08-08-2007 09:44:47  
Well, since money doesn't seem to be an impediment I think that John gave you the best technical advice you are going to get here, i.e. talk to a local machine shop and see what they recommend. I didn't check, but if you have not posted the question on the puller's forum you might want to do that. There are more guys on there that know what can be done and where you can get the parts you need.

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Hotrod770

08-08-2007 16:32:57




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 Re: 770 engine rebuild in reply to Princeton Bill, 08-08-2007 13:29:44  
770
Thanks for the input.



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