Cloud II engine swap - Rolls-Royce and Bentley Forums
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post #1 of 17 (permalink) Old 12-03-2018, 06:21 PM Thread Starter
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Cloud II engine swap

Has anyone ever swapped a Shadow engine into a Cloud II? If so what issues arose?
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post #2 of 17 (permalink) Old 12-05-2018, 01:06 AM
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Hi Nick, I haven't done it and I don't know anyone who has but I can see a possible issue with the Cloud transmission mating up to the Shadow engine. The Cloud has the old GM Hydramatic 4 speed trans whereas almost all the Shadows would have the GM TH400 Turbo Hydramatic 3 speed. Only the earliest Shadows up to VIN 4483 and only RHD cars were equipped with the 4 speed Hydramatic when new. If you could find one of those engines it may drop right in but you would have to do some part number research to see if the adapter and torque converter would mate up. The Shadow valley cover will have the brake pumps in it which you won't need for the Cloud. If you obtain a complete Shadow drivetrain with the TH400 and install it, you would then not have the Cloud mechanical servo for the brakes. In my opinion I think you would be better off rebuilding the engine in your Cloud rather than considering a swap.

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post #3 of 17 (permalink) Old 12-05-2018, 10:15 AM Thread Starter
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thanks Jim, I was hoping the bolt pattern on the transmissions would be the same for the V8 since they are both GM, I guess that is not the case?
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post #4 of 17 (permalink) Old 12-05-2018, 08:53 PM
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I wonder if a Chev 350 would bolt up to the Cloud II's transmission ?

The 350 may not be a RR engine, but it certainly is infinitely simpler and easier to work on.
Parts abound and inexpensive.
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post #5 of 17 (permalink) Old 12-06-2018, 02:22 AM Thread Starter
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Want to keep it RR
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post #6 of 17 (permalink) Old 12-06-2018, 09:10 PM
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Originally Posted by nickk View Post
Want to keep it RR
Yeah, I kind of thought so, but just think how wonderfully simple the Chev engine is compared to the overengineered RR engine.
Unnecessary crank sludge traps, bolts instead of studs on the heads.
No aluminum block or wet liners.


I'm just going to say this, RR took a nice simple reliable GM engine and buggered it up by making it to complicated for no good reason.
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post #7 of 17 (permalink) Old 12-07-2018, 09:58 PM
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That's sacrilege Jeff, give yourself 40 good lashes and repent!
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post #8 of 17 (permalink) Old 12-07-2018, 10:41 PM
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That's sacrilege Jeff, give yourself 40 good lashes and repent!
ROFL !
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post #9 of 17 (permalink) Old 12-11-2018, 01:32 PM
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My dream has always been to put a Turbo R engine into a cloud/s.
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post #10 of 17 (permalink) Old 12-14-2018, 08:25 PM
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Originally Posted by Jeff R 1 View Post
.... bolts instead of studs on the heads...
.
From an engineering perspective, bolts are so much inferior to studs on a cylinder head. When torquing a bolt, you damage it because it turns inside the hole, leading to rotational stress, on top of the pulling force. Studs are different, they don't turn, and hence suffer only longitudinal stress.
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