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Tractor Pulling Discussion Forum

77 stroker problem

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rudy77

08-10-2006 18:51:27




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I am building a 77 with a 3 3/4" bore and 4" stroke with stock rods. the problem is the pistons come up past the top of the block about .100 - .125. I have never built a stroker motor before so I am not sure of the best way to fix. I know this combo has benn used alot so any help would be great. thanks




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B-maniac

08-12-2006 20:50:12




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 Re: 77 stroker problem in reply to rudy77 , 08-10-2006 18:51:27  
When you increase the stroke of an engine by 1",the piston will come up the cylinder 1/2" higher and go 1/2" lower in the cylinder at the bottom of its stroke. Assuming your engine had a zero deck height (top of piston to top of cylinder block deck) you would have to reduce the piston height by 1/2". You could machine it off (if there is enough material to do so)or buy different pistons with the pin 1/2" closer to the top. Shorter rod would work,but dont,it's the stupid way of doing it for many reasons. Now comes the good part. IF your engine DIDN'T have zero deck,by stroking it,you now can make it zero or any other clearance you want,so you can up your compression to where ever you want it(within reason).Make sure and check for valve to piston clearance when doing this. So it's a win-win-win situation. You get more torque from the added leverage of the crank pin being farther away from the centerline, you get more cubic inches(torque) from the piston being 1/2" farther down the cylinder at BDC and you get more compression which allows you to burn a higher octane fuel and a little more spark timing which gives you a longer more powerfull power stroke. AND, to top it all off,you can get ALL of this at the same rpm you were running before! Please resist the temptation to buzz the thing up 1000 more rpm than it was designed for. It's a tractor, not an Indy car.Eventually something WILL fly apart from exessive centrifugal forces.It's 50 yrs old,the extra hp is bad enough on it,keep the rpm within 500 of stock.People are going to start getting hurt with these things and when they do, no one will be able to get insurance to run these pulls anymore.(affordable)These figures are only for explanation purposes.I'm sure your specs are different.The idea is the same.

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rudy77

08-11-2006 14:39:47




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 Re: 77 stroker problem in reply to rudy77 , 08-10-2006 18:51:27  
Would a thicker head gasket work?



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Been There

08-11-2006 06:45:48




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 Re: 77 stroker problem in reply to rudy77 , 08-10-2006 18:51:27  
If you don't mind the compression, take them into the machine shop and have them machined to fit into the head. Leave the resulting step for the extra compression.



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Gamitch

08-11-2006 05:21:42




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 Re: 77 stroker problem in reply to rudy77 , 08-10-2006 18:51:27  
No sweat Rudy. Take the pistons to a shop and get them ground down whatever you need taken off unless you feel comfortable doing it yourself with an angle grinder or belt sander.



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