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Reverse rotation engine question ...

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Old 08-16-2004, 09:45 AM
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Default Reverse rotation engine question ...

IS there anything different about the pistons and rods in a reverse rotation engine ? Or can you take a standard engine and change the cam , timing, etc .and run it . Are the pistons and rods mounted different ?

A friend did this with a motor and lost the bottom end . We are not sure of the condition of the motor prior trying it . It may have just been no good anyway . But ALL of the bottom end bearings are destroyed exactly the same ......
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Old 08-16-2004, 11:09 AM
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Default Re: Reverse rotation engine question ...

I would think that the tabs that hold the bearings in place would come from the other direction in a reverse engine.

My friend has one in his fishing boat but he bought it replace the reverse engine that fried.
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Old 08-16-2004, 11:51 AM
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Default Re: Reverse rotation engine question ...

man i thought you were gonna get your boat running!!!!!
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Old 08-16-2004, 12:30 PM
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Default Re: Reverse rotation engine question ...

I don't think the rods or pistons are different but the timing cover seal is different and the rear main seal is different on some.
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Old 08-16-2004, 12:43 PM
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Default Re: Reverse rotation engine question ...

I assume we're talking Chevy's here.

The notches on the side of the pistons
face the rear of the block, instead of the front.
(this changes the pin/thrust offset)

hope this helps.

jt
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Old 08-16-2004, 12:47 PM
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Default Re: Reverse rotation engine question ...

They did a lot of them when I was at Cruise master the Arneson drives in those days required a reverse rotation engine actually I like that setup better than using a gear set to reverse rotation. I guess you could drive a mechanic crazy by slipping a reverse starter on a standard engine.All kidding aside I also heard the Oil should lead the thrust 60 degrees on the crank so a special drilled crank would be needed But the Builder would know best on this point.
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Old 08-16-2004, 12:48 PM
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Default Re: Reverse rotation engine question ...

Quote:
Originally Posted by jt29olhp500s
I assume we're talking Chevy's here.

The notches on the side of the pistons
face the rear of the block, instead of the front.
(this changes the pin/thrust offset)

hope this helps.

jt
This is right,allso the front and rear seals are different,time gear instead of chain.
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Old 08-16-2004, 01:01 PM
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Default Re: Reverse rotation engine question ...

four weeks ago we reversed the rotation of one of my engines to get rid of the drop boxes. we had a cam ground with the same specks but in reverse rotation and had the cam gear that drives the oil pump and distributor ground with the opposite angle. then you put a distributor gear on that is ground the opposite angle and the oil pump spins the right way, then you change the fireing order and put the starter on the other side of flywheel and away you go, total cost was $340 lunati custom cam, $27 reverse direction distributor gear, and $70 for next day shipping because i hate to wait.
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Old 08-16-2004, 01:04 PM
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Default Re: Reverse rotation engine question ...

Thanks for all the info !

I need to know this for a fact ....

I have two, off board sources, that are arguing . One says yes ,one says no .

Please let me know the facts if possible . Thank you very much ! Joe

Steve1 . I like that starter idea !
I have a 1000 that runs reverse in my cat with the arnesons . But it has been on the floor for 3 years now . (as "Outer42" knows )I can't remember how it is done ......

Thanks !
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Old 08-16-2004, 01:09 PM
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Default Re: Reverse rotation engine question ...

Hey Bigyellowcat, You didn't change anything in the bottom end ? What about the seals ?
How much time do you have on them now ? Thanks for your reply !
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