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Massey Harris & Massey Ferguson Tractors Discussion Forum
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continental h260 specs.

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the preacher

03-24-2005 17:07:36




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i would like to know the compression height for a continental h260 engine.mine is actually an h277. someone a long time ago installed pistons and liners from a 277, but the compression height should be the same. i would appreciate any help. thanks




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the preacher

03-25-2005 15:15:59




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 Re: continental h260 specs. in reply to the preacher, 03-24-2005 17:07:36  
i apologise for not putting it in laymans terms. compression height is the distance from the center of the wrist pin to the top of the piston. this is measured on a flat top piston.if piston has a dome it would be measured to the part of the piston that meets zero deck height at T.D.C.



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HarleyD

03-25-2005 14:55:12




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 Re: continental h260 specs. in reply to the preacher, 03-24-2005 17:07:36  
I think there is a difference in the rear main seals between the 260 and the 277 engines. I would like to buy a seal for a 277 engine used in a 444. thanks



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Bruce C

03-26-2005 07:22:57




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 Re: continental h260 specs. in reply to HarleyD, 03-25-2005 14:55:12  
The rear seal for my 260 I got from Continental Engines.It come as a kit.It bolts on the outside of the block.



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Bruce C

03-24-2005 22:02:16




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 Re: continental h260 specs. in reply to the preacher, 03-24-2005 17:07:36  
The H-260 engine was built with a 3-7/8 in bore and 5-1/2 in stroke.Compression ratio:Distillate 4.68 to 1.Has 80 to 85 pounds of compression.Compresion ratio:Gas 6.65 to 1.Has 125 to 135 ponds of compression.The H-277 has a 4 in bore with a 5-1/2 in stroke.Copression ratio is 6.25 to 1.Has 120 to 130 pounds of compression.Compression is checked at cranking speed.The blocks for the H-260 and the H-277 are the same.The differance in the engines is the size of the bore.Four in pistons and liners will fit in the H-260 block.4-1/16 pstons and liners will also fit in the H-260 block.I know this for sure because my H-260 had four in pistons in it and I changed it to 4-1/16 pistons and liners.

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jjl

03-25-2005 12:56:29




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 Re: continental h260 specs. in reply to Bruce C, 03-24-2005 22:02:16  
Blocks are very similar, but not identical. The OD on the liners are around .080 difference from the 260 to the 277. 4 1/16 sleeves were made for both the 260 & 277. If you would have gotten the wrong set they would not have fit in your 260 block. The 260 block is designed for thrust washers on the front journal whereas the 277 is designed for a thrust bearing on the center journal. These are the 2 major differences.

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jjl

03-24-2005 19:06:30




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 Re: continental h260 specs. in reply to the preacher, 03-24-2005 17:07:36  
Not sure I understand what you are looking for. Do you mean compression ratio, or piston to valve clearance? The 4" piston is the same height as the 3 7/8". The liners are not from a 277 as they have a different OD & would not work in the 260 block. The old liners may have been bored to 4" or replaced with an overbore kit.



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Harris Guy

03-24-2005 19:03:29




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 Re: continental h260 specs. in reply to the preacher, 03-24-2005 17:07:36  
You are getting to know every bolt on classic correct red. The specs on 260/277 sleeves are both
.004, above the block. Ring thickness was a tad more on the 277, gap clearance, as well. We're
talking marginal decimal differences here. The engines were close, until the head was upgraded,
on the 277, in the 444, RPM's pushed from 1350, to 1500. High-Arch Special, late series, is a nice MH, with all the potential, no compromises.

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