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Tractor Pulling Discussion Forum

Re: JD A Engine Rebuild

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Author  [Modern View]

07-02-2013 12:38:03

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About those eyebrows? I'm in the process of building a LP 60 with a stock head and block. The custom pistons I have ordered will take the comp. ratio to 12.5 to 1. It was recommended to me to open up the eye brows around the valves slightly by milling, which we did, and then measured the CC to arrive at the piston fabrication measurements. My question is if I were to have detonation problems can I completely remove the eyebrows to raise CC measurement? I had planned to install some type of thicker head gasket if I had problems. What do you guys think?

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07-03-2013 04:23:17

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 Re: JD A Engine Rebuild in reply to Noforddon, 07-02-2013 12:38:03  
You can put a steel spacer below the cylinder block. 12.5:1 is pretty steep for a 2 cylinder. Huge bore exaggerates detonation problems.

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07-02-2013 15:46:08

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 Re: JD A Engine Rebuild in reply to Noforddon, 07-02-2013 12:38:03  
I have/had pictures of a sectioned 60 head showing the deck thickness under and around the eyebrows. Take all the eyebrow off and use a set of valve springs from an 80/820/830/840 iirc they fit and are much heavier. The problem is with the open chamber combustion chamber design. There is no squish or quench area which reduces detonation. Unless the there is some way to make a flat potion of the piston approach within 40 thou of a flat portion of the cylinder head.

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