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F-20 Engine Assy with Pictures!!

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SproutW

03-13-2007 07:09:33

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To clear things up on my earlier post I've attached some pictures. One picture is the deck with the head gasket installed. Let me know what you guys think. I might be worried for nothing but was a little concerned about the clearence since the pistons are sticking up so far above the deck. I'm use to seeing domed pistons and not flat top when they stick up this far.

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03-14-2007 04:59:43

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Re: F-20 Engine Assy with Pictures!! in reply to SproutW, 03-13-2007 07:09:33

Who's your buddy on the floor? I have a lab too she can hardly wait to get in the shop with me and then she can hardly wait to get out the door. Always on the wrong side and missing somthing.

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SproutW

03-14-2007 05:24:32

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Re: F-20 Engine Assy with Pictures!! in reply to ET, 03-14-2007 04:59:43

I actually have two shop buddies. They watch me work or sleep on their beds and usually stay out of my way. They are like family to us.

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03-14-2007 04:52:53

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Re: F-20 Engine Assy with Pictures!! in reply to SproutW, 03-13-2007 07:09:33

Who's your buddy on the floor? I have a lab too she can hardly wait to get in the shop with me and then she can hardly wait to get out the door. Always on the wrong side and missing somthing.

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the Unforgiven

03-13-2007 13:35:04

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Re: F-20 Engine Assy with Pictures!! in reply to SproutW, 03-13-2007 07:09:33

Okay, here goes. The pressure of compression and combustion is equal everywhere ABOVE the top ring. That high crown on Sprout's pistons do nothing to make a seal in the head, nor do they seal ANYTHING while it is still in the cylinder, that is the primary job the top ring. Since the top of the piston is smaller than the cylinder, the gasket does not care where the top of the piston is, because the sealing ring is still below it. The high crown only occupies more space in the combustion chamber than a lower crown, less open space at TDC means a higher compression ratio and more power. I think you could set the rocker gear on and push the rocker down with the heel of your hand and get a good idea of how much valve travel you have available at TDC. I would bet that your spring will be coil bound before you hit the piston, or at least very close. If someone showed me that picture of most any engine, I would say that it almost certainly would not work. But the 20 does have a huge true open chamber, and I have used these pistons myself. Is that a narrow tread?

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SproutW

03-13-2007 17:00:52

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Re: F-20 Engine Assy with Pictures!! in reply to the Unforgiven, 03-13-2007 13:35:04

Yup that's a narrow tread. The engine must of had water in it and froze. Everything was full of cracks. I located a NOS block and the engine kit and went to town. I hope in the next month or so the old girl will be going again after 40+ years.

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FarmallBob

03-13-2007 12:43:31

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Re: F-20 Engine Assy with Pictures!! in reply to SproutW, 03-13-2007 07:09:33

Hi,
I was wondering this same thing. When I did my engine over my pistons were below the block. I would be afraid that much out of the block would be hitting the head or the plugs. You must have .200-.300 thosandths over the block and it seems to me you want the compression to be down inside the sleeve area. Otherwise all that compression is on the headgasket. I hope someone else adds to this that is a little more knowledgeable than myself.
Bob

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03-13-2007 10:34:33

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Re: F-20 Engine Assy with Pictures!! in reply to SproutW, 03-13-2007 07:09:33

Thats about how mine looks.

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SproutW

03-13-2007 11:13:49

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Re: F-20 Engine Assy with Pictures!! in reply to ET, 03-13-2007 10:34:33

I feel a whole lot better.

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SproutW

03-13-2007 07:10:41

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Re: F-20 Engine Assy with Pictures!! in reply to SproutW, 03-13-2007 07:09:33

Another picture without the head gasket.

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