Engine and Transmission Tech

tips, technology, tools and techniques related to vehicle driveline components

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donfaber
Don Faber
Columbus, IN
(89 posts)

Registered:
10/31/2007 10:53PM

Main British Car:
1979 MGB 3.9L Rover V8

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Re: Crankcase ventilation Rover 3.9L V8 w/ Edelbrock carb
Posted by: donfaber
Date: August 01, 2021 12:49PM

Carl - I'm only installing a flame trap on left side - pcv already installed on right side. Seems to be the consensus?

Don


MGBV8
Carl Floyd
Kingsport, TN
(4327 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

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Re: Crankcase ventilation Rover 3.9L V8 w/ Edelbrock carb
Posted by: MGBV8
Date: August 02, 2021 09:13AM

Right. I got hung up on Fred's suggestion of a crankcase depression regulator & forgot that you were only looking for a flame trap. :)

I am intrigued by this CDR. Not sure I really understand the difference between it & a PCV. I have read that a CDR is a essentially a PCV for diesel engines. It functions in the opposite manner in regards to vacuum.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6274 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

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Re: Crankcase ventilation Rover 3.9L V8 w/ Edelbrock carb
Posted by: BlownMGB-V8
Date: August 02, 2021 10:45AM

Part of a stainless steel pot scrubber pad makes a pretty good flame trap. You can use it in any suitable enclosure. As an example, I have about half of a pad strung out and drawn into 1" diameter length of silicon hose which runs from my mechanical fuel pump block off plate up to the inlet of my Enderlie style intake scoop. You can probably see it in my avatar, the hose is blue which contrasts with literally everything else on the car. Rover uses a canister on the valve cover similarly filled.

I'd like to see an explanation of that regulator compared to the TR4 pcv. Is there a difference in the way they work?

Jim


ex-tyke
Graham Creswick
Chatham, Ontario, Canada
(1160 posts)

Registered:
10/25/2007 11:17AM

Main British Car:
1976 MGB Ford 302

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Re: Crankcase ventilation Rover 3.9L V8 w/ Edelbrock carb
Posted by: ex-tyke
Date: August 03, 2021 08:25AM

Quote:
I'd like to see an explanation of that regulator compared to the TR4 pcv
Looks similar to the PCV that was used in ''65 - '67 MGB's , Spitfires and who knows what else - I know my '64 never had one.
(photo courtesy of Moss)
MGB PCV.jpg



Edited 1 time(s). Last edit at 08/03/2021 08:26AM by ex-tyke.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6274 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Crankcase ventilation Rover 3.9L V8 w/ Edelbrock carb
Posted by: BlownMGB-V8
Date: August 03, 2021 09:55AM

It also has one inlet and one outlet.

Jim


DiDueColpi
Fred Key
West coast - Canada
(1338 posts)

Registered:
05/14/2010 03:06AM

Main British Car:
I really thought that I'd be an action figure by now!

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Re: Crankcase ventilation Rover 3.9L V8 w/ Edelbrock carb
Posted by: DiDueColpi
Date: August 03, 2021 09:56PM

The "TR4" pcv is essentially the same as the cdr system.
It's biggest flaw was that it was prone to ingesting oil due to the limited drain back from the cylinder head. (try filling the TR engine with oil. The valve cover fills almost immediately)
It also doesn't have big enough plumbing, probably due to the drain back issue.
The rear crank scroll seal was also a miserable thing that allowed air (and contaminants) to enter the engine, defeating the pressure drop and exacerbating the drain problems with the upper engine.
It's biggest problem however, was that it was different.
Most didn't understand how it was supposed to work and hobbled it with catch cans, road draft tubes, crankcase vents, etc. They then removed the valve because the engine wouldn't idle properly.
It gained an undeserved reputation as a bad design.
That problem seems to continue to this day. With almost any engine or unconventional system falling into disfavor.
Many "fixes" for engine breathing issues still recommend catch cans and open breathing mods.
None of that is required with a properly designed and operating system.


Gswest236
Scott West
Seabeck, Washington
(28 posts)

Registered:
07/14/2021 09:13PM

Main British Car:
1974.5 MGBGT V8 Olds 215 Stroked to 266

Re: Crankcase ventilation Rover 3.9L V8 w/ Edelbrock carb
Posted by: Gswest236
Date: October 19, 2021 10:09PM

I had this exact issue with my GT V8. Oil pumping out every possible seal. After I got the CDR installed, no oil on the floor after a spirited drive. And no oil on the Offy valve covers around the oil fill openings. Best $50 Iíve spent yet (CDR part exactly as shown in this forum above). Look on ebay or Amazon etc.
FF3A58CF-7384-4532-9C8D-0D427CB6DFB9.jpeg

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