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  #21  
Old 10-15-2007, 03:02 PM
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Re: Engine Theory, Build, Etc Discussion.

LoL - Well umm...not really sure what to tell ya cuz I'm not sure what it is your asking. The stroke is how far the rod journal is extended from the main body of the crank. In our case its 97mm, in the case of H22's its 90mm.

Knife edging doesnt increase or decrease stroke. It narrows or "knife edges" the journals on the crank so that it cuts through the oil in the pan more efficiently w/ less drag.
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Old 10-15-2007, 03:04 PM
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Re: Engine Theory, Build, Etc Discussion.

If I can get Drew or someone to come over I'll take some pics of this stuff to better explain it. Cuz I've bascially got an entire bottom end of an engine to work with.
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Old 10-15-2007, 03:08 PM
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Re: Engine Theory, Build, Etc Discussion.

wat's a rod journal?
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Old 10-15-2007, 03:12 PM
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Re: Engine Theory, Build, Etc Discussion.

The connecting rods are connected to the crankshaft via the rod journals.
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Old 10-15-2007, 03:18 PM
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Re: Engine Theory, Build, Etc Discussion.

Originally Posted by Kid2000EX View Post
I would kind of like to know that too. At least knife-edging to increase stroke, I think!
knife edging reduced the weight and drag on the counter weights, and has nothing to do with the stroke.
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Old 10-15-2007, 03:19 PM
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Re: Engine Theory, Build, Etc Discussion.

Originally Posted by BlkCurrantKord View Post
LoL - Well umm...not really sure what to tell ya cuz I'm not sure what it is your asking. The stroke is how far the rod journal is extended from the main body of the crank. In our case its 97mm, in the case of H22's its 90mm.

Knife edging doesnt increase or decrease stroke. It narrows or "knife edges" the journals on the crank so that it cuts through the oil in the pan more efficiently w/ less drag.
The crankshaft should never touch the oil in the pan. There is a heavy oil mist in the crank case from oil coming past the main and rod bearings though.

It is done to the counter weights, not the journals.
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Old 10-15-2007, 03:20 PM
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Re: Engine Theory, Build, Etc Discussion.

What do you guys consider the weakest point of the f23's bottom end?
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Old 10-15-2007, 03:21 PM
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Re: Engine Theory, Build, Etc Discussion.

Originally Posted by BlkCurrantKord View Post
If I can get Drew or someone to come over I'll take some pics of this stuff to better explain it. Cuz I've bascially got an entire bottom end of an engine to work with.
I've got a D16A6 disassembled on my bench...If I get time I may take some pictures, I have a load of stuff to sell on ebay anyway.
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Old 10-15-2007, 03:41 PM
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Re: Engine Theory, Build, Etc Discussion.

Well for basics, the rods are connected to the crank and as it spins it moves them up and down. The crank determines the stroke. The stroke is how far the distance is from when the piston is at its lowest position to its highest. To my knowledge the major modifications made to the crank are: knife- edging, micropolishing, and balancing. The goals of these I believe are to reduce rotational mass, reduce bearing wear, and ensure the crank is balanced so that it doesn't get a wobble at high rpms.

I do not know about mods to the crank that would increase stroke. That is most often done through the use of an aftermarket stroker crank. B16's are stroked to 1.8L 4G63's can be stroked to 2.3L, etc.

Last edited by turboputz; 10-15-2007 at 03:43 PM.
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Old 10-15-2007, 04:18 PM
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Re: Engine Theory, Build, Etc Discussion.

Originally Posted by xci.ed6 View Post
The crankshaft should never touch the oil in the pan. There is a heavy oil mist in the crank case from oil coming past the main and rod bearings though.

It is done to the counter weights, not the journals.

I know this, just trying to answer one too many questions at once.
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