Dumb Engine Question

Anonymous-0 · Jan 29, 2013

How many different spots (as on the ring gear) do the following engines stop? Straight 4, straight 6, V6, V8 ?

RickieBlue · Jan 29, 2013

An engine will always stop coming up on compression...a 4cylinder 2 spots as it fires every 180° an 8 cylinder 4 spots..every 90° and so on.................

Janicholson · Jan 29, 2013

2, 3, a variety with different V angles and offset rod journals usually 3, and 4 Jim

ShadetreeRet · Jan 29, 2013

I don't know if the number of cylinders makes that much difference or not, but I have seen a number of engines that had the flywheel ring gear badly worn in one spot. And I have heard it said that most engines stop in one spot, but have never researched it. Maybe there is an engineer or physics professor lurking out there somewhere who will be able to enlighten us.

teddy52food · Jan 29, 2013

Rickie is right.

Anonymous-0 · Jan 29, 2013

Thanks, Maybe my question was not so dumb after all..

PJH · Jan 29, 2013

The starter ring gear on my 2 cylinder JD was worn out in one spot. Would it be safe to assume that a four cylinder would stop in two places, a six in three, and an eight in four?

This is a question, not an answer. . .

ericlb · Jan 30, 2013

i dont know on 4 or 6 cylinder engines but a good old v-8 will always stop on 1 of 4 different spots, i studied that one time back in high school, but that was 45 years ago, and i dont remember all of it but it seems like it had to do with a combination of compression, rotating mass, and rpm, when the key is switched off, with the engine at idle, depending on the instant the key was turned off the engine would always coast to a stop in 1 of 4 places, as i said we didnt do 4 or 6 cylinder engines back then

Vernon in Ks · Jan 30, 2013

neet topic, but what about the 3 and 5 cylinder engines?

teddy52food · Jan 30, 2013

You are right. It stops because of compression & will rock back & forth because of it.

RandyB(MI) · Jan 30, 2013

I assume you mean "hypothetical" stop spots as apposed to actual tooth count. Actual tooth count will vary with the rock of reciprocating mass at actual stop. Hypothetical? the last guy got it right...4cyl IL=2 etc.

Anonymous-0 · Jan 30, 2013

Yes, just the general area of the ring gear..

Dumb Engine Question

Anonymous-0

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RickieBlue

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Janicholson

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ShadetreeRet

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teddy52food

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Anonymous-0

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PJH

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ericlb

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Vernon in Ks

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