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71 Detroit Specs not found in a book.


 
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VicS
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PostPosted: Sun Nov 04, 2012 7:00 pm    Post subject: 71 Detroit Specs not found in a book. Reply to specific post Reply with quote

At least I can"t find them. I understand the lip on the sleeve sits .045 down from the top of the block. How thick are the compression/head gasket rings? do they crush? How far is the piston down in the sleeve at top-dead-center? It appears to come up flush, when I looked at one at the junk yard. Seems the piston would hit the valves because the head is flat and the valves and injector stick out. I am attempting to bore and stroke it. Need to know exactly to order pistons. Have I forgot something? Thanks Vic
 
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old 2 stroker
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PostPosted: Sun Nov 04, 2012 8:00 pm    Post subject: Re: 71 Detroit Specs not found in a book. Reply to specific post Reply with quote

Your not going to be able to stoke it much as you will either pull the lower ring pack out of the liner or push it past the intake port. It fire rings are aluminum and crush. The wrist pins must be sealed vacuum tight or it will either start picking its own oil up and run off or have a lot of blowby. I prefer trunk rods. Hope this helps.
 
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buickanddeere
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PostPosted: Mon Nov 05, 2012 11:01 am    Post subject: Re: 71 Detroit Specs not found in a book. Reply to specific post Reply with quote

As previously stated. Good luck on the stroking as some precision machined custom pistons will be required to keep the deck height and port timing.
A bored 71 series is just a 92 series.
Time to get the degree wheel and dial indicator out and measure valve timing. Port timing may perhaps be tested by putting a few psi in the cylinder and listen for the hissing sound to change.
 
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johns
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PostPosted: Mon Nov 05, 2012 8:26 pm    Post subject: Re: 71 Detroit Specs not found in a book. Reply to specific post Reply with quote

Vic I like the idea of trying this on a 71 series, I'm just not sure how its possible with the 71 series being a dry liner. How many cylinder 71 series are you working on? Have you considered a high port block, the high compr. 18.7:1 pistons, ground cam, 4 valve head, and large injectors? They really wake up the 71 series. Are you planning on using a turbo? What tractor are you using? Sounds like a fun project.
John
 
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VicS
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PostPosted: Tue Nov 06, 2012 6:58 pm    Post subject: Re: 71 Detroit Specs not found in a book. Reply to specific post Reply with quote

Thanks for your serious reply's. I am trying to make a 2-53 series into a 2-71. I am slowly getting there. We have it mocked up, crudely! It's like putting a 7 inch stroke into a WC. Actually within .050 of being there. Vic
 
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bock
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PostPosted: Tue Nov 06, 2012 7:13 pm    Post subject: Re: 71 Detroit Specs not found in a book. Reply to specific post Reply with quote

hope you dont brake that tractor in half with all that motor you are building ,dont ever say it cant be done , a tractor puller will try it how are you getting along with the d17?
 
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VicS
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PostPosted: Tue Nov 06, 2012 7:45 pm    Post subject: Re: 71 Detroit Specs not found in a book. Reply to specific post Reply with quote

It's on hold for a while. Actually I'm building Christmas presents for the Grand Kids right now.
 
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