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Old 07-23-2005, 01:02 AM
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engine Idea!

OK so I had another idea floating around in my head, this one is a double over head valve engine..yeah... also and idea for a wet cylinder sleeve and cylinder head in one casting which would prevent head gasket leaks and make things more simple.

heres a picture


It's kinda like a nail head but with a pent roof head another set of valves, cam, push rods ans all the other fun stuff!

It would have 4 valves per Cly,two cams,and the advantages of a DOCH engine but some of the simplicity of a OHV engine.

So what do you think, any comments would be welcome, good or bad


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Last edited by inspiron; 07-23-2005 at 11:45 AM.
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Old 07-23-2005, 01:29 AM
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seems like a good idea from what i can tell, i would put my name on the pic or or something make it yours and only yours before some one takes your idea
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Old 07-23-2005, 02:05 AM
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Is that an opposing cylinder engine you are toying with? It looks a lot like a BMW air cooled engine used on their bikes.

Al
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Old 07-23-2005, 01:24 PM
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Quote:
Originally Posted by Gr8 '48 bow tie
Is that an opposing cylinder engine you are toying with? It looks a lot like a BMW air cooled engine used on their bikes.

Al

Nope, it's a V configuration. but It would work with an opposing engine
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Old 07-23-2005, 03:14 PM
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Nice drawing, I wish I was half the artist you are...but as far as the engineering standopoint...it leaves a little to be disired. For example, how will the assembly and repair of this stuff work? The cylinder head you suggest, say it did develope a leak {it must seal somewhere}, would the pistons need to be pulled from the bottom end to fix it? the way you suggest seems like a head gasket leak would require a complete engine rebuild. or did I miss something?

Simple and awsome would be a dual overhead "rotary" cam, no valves no push rods.
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Old 07-23-2005, 03:27 PM
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http://www.coatesengine.com/

Rotary valve is a reality.

That drawing looks like a nailhead/hemi type deal. A single overhead cam would be much easier. Ford did that already too.

The problem with Ford's engine is it's size. N/A engines can only do so much with 4.6/5.4L to work with. Not to mention the expense.

Nice idea though.

Larry
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Old 07-23-2005, 05:04 PM
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Not as bad to manufacture as it may seem if you think in terms of jugs surrounded with water jacket. In this case, the jugs unbolt from the block individually. Don't know if you can get the rigidity of the present block/head motors. Easily identified as a 32 valve, dual overhead cam setup. I can see the return of the Corvair/Harley push rod tubes that have a propensity of oiling the external surfaces as a byproduct of lubing the internal parts. Keep working on your "outside the block" thinking.

Trees
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Old 07-23-2005, 05:57 PM
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Quote:
Originally Posted by NXS
Nice drawing, I wish I was half the artist you are...but as far as the engineering standopoint...it leaves a little to be disired. For example, how will the assembly and repair of this stuff work? The cylinder head you suggest, say it did develope a leak {it must seal somewhere}, would the pistons need to be pulled from the bottom end to fix it? the way you suggest seems like a head gasket leak would require a complete engine rebuild. or did I miss something?

Simple and awsome would be a dual overhead "rotary" cam, no valves no push rods.
The clyender head can't leak since the the head and sleeve are all one cast part. If it needed to be replaces it would be pulled out from the top.
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Old 07-23-2005, 06:36 PM
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won't the water have to be sealed from the crankcase?
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Old 07-23-2005, 07:26 PM
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Quote:
Originally Posted by NXS
won't the water have to be sealed from the crankcase?
Sure will, there would be seals at the bottom of the sleeve to prevent this from happening,If I'm not mistaken wet sleeves are used alot in large diesels so they must work pretty well.
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Old 07-23-2005, 08:04 PM
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Looks a lot like an outboard motor which has no cylinder head but a one piece deal that incorporates the cylinder and "head" all in one. Of course it is a two stroke so there are no valves in the "head" area. The pistons are mounted to the rods and then to the crank and the whole deal is inserted from the "bottom" of the block. Makes for a very ridged piece. My concern would be how you would machine valve seats, guides, etc. with this design. I would guess that some new machining techniques would have to be developed to do it. It usually boils down to money. If it costs too much to do, then the benefits you mentioned become mute. It may still be cheaper to replace an occaisional blown head gasket. My two cents anyway. Hey....at least you're thinkin'.
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Old 07-23-2005, 08:06 PM
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what he said!
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Old 07-25-2005, 12:51 PM
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What about your extreme valve angle's. To the tune of 45 degree's. A 23 degree head is bad enough. I don't know about simpler than OHC. No pushrods, rocker, stems, etc...
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