Leyland Marina E-Series Twin Cam

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BobbyV
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Location: Brisbane Australia

Leyland Marina E-Series Twin Cam

Post by BobbyV » Thu Aug 05, 2021 6:29 am

Hi All from Australia.
I have an Australian Leyland Marina 1750 with an auto trans.
I was hoping to upgrade it a bit with 2 x SU HS6 carbs that I happen to have. I even have a twin carb inlet manifold from Lynx especially for E-Series engines and SU Carbs (see picture in link below)
https://www.lynxauto.com.au/nomad-1500- ... 1-3-4.html
Listed as a Leyland Nomad which had the e-series engine.

My issue is that the car has an existing one piece integrated inlet/exhaust manifold. SO to use my set-up I will need to find a separate exhaust manifold (or headers) that will fit the e-series engine. Of course I would be happy to get an original Leyland E-Series TC Model integrates manifold system but I just can't find one.
Now I know the other options include the Austin/Morris Maxi and the Austin Allegro.. The Allegro had a twin cam version and both had performance upgrade options that came with twin carb manifolds. Not sure if they had integrated manifolds but some research suggests they might be separate.


Let me know if you have any ideas.

Cheers
Bob
BobbyV
Brisbane, Australia
'74 Leyland Marina 1750 Super Sedan
'83 Ford Capri 2.8i
'82 Mercedes 280ce
'84 Holden Statesman Deville
'69 Alfa Romeo Spider
'17 Tesla Model S 75D ;)

david painter
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Re: Leyland Marina E-Series Twin Cam

Post by david painter » Thu Aug 05, 2021 7:01 am

On a UK Maxi HL and twin carb Allegro they were separate parts. When converting Mini's to TC i have seen the original manifold cut up and just the exhaust part used
Dave

BobbyV
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Joined: Mon Jan 21, 2019 10:05 am
Location: Brisbane Australia

Re: Leyland Marina E-Series Twin Cam

Post by BobbyV » Thu Aug 05, 2021 10:33 am

Thanks Dave
Good to know there were indeed separate manifolds. I just tried UK ebay and other sites but can't find one yet. Will look at the cut down option but might be hard to integrate with the new inlet manifold as the ports are very close. Thanks again.
Bob
BobbyV
Brisbane, Australia
'74 Leyland Marina 1750 Super Sedan
'83 Ford Capri 2.8i
'82 Mercedes 280ce
'84 Holden Statesman Deville
'69 Alfa Romeo Spider
'17 Tesla Model S 75D ;)

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locost_bryan
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Re: Leyland Marina E-Series Twin Cam

Post by locost_bryan » Thu Aug 05, 2021 10:55 pm

The cast iron TC manifolds were prone to cracking. I've got the original manifold off my TC, which had cracked and been poorly welded, and was considered beyond repair. The exhaust portion of the manifold appears to be identical to the single carb manifold, but I don't think you could cut it up like a Mini manifold (which I did many years ago).

I think you have a few options :-
  • Maxi or Allegro factory tubular manifold (very hard to find, prone to rust and crack)
  • Maestro/Montego/Rover 200 R-series or S-series manifold (based on the E-series, pretty sure they have the same basic head and port spacing)
  • there were extractors available from Sonic for the E-series (I would imagine not much chance of finding one now)
  • get an extractor custom made
Last edited by locost_bryan on Thu Aug 05, 2021 11:05 pm, edited 3 times in total.
Bryan
Auckland NZ

1972 Morris Marina 1750 TC Coupe "Ozzy"

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locost_bryan
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Re: Leyland Marina E-Series Twin Cam

Post by locost_bryan » Thu Aug 05, 2021 11:02 pm

FYI

Maestro 1600 S-series manifold gasket
Image

Marina 1750 manifold gasket
Image

Here's a link to a Special Tuning manifold https://historicmarathonrallygroup.co.u ... -manifold/
Bryan
Auckland NZ

1972 Morris Marina 1750 TC Coupe "Ozzy"

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locost_bryan
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Re: Leyland Marina E-Series Twin Cam

Post by locost_bryan » Thu Aug 05, 2021 11:38 pm

Janspeed in the UK made a twin carb conversion kit for the Maxi and Allegro, with a combined manifold, listed in their 1974 catalogue.

Interesting that they also did two modified cylinder heads for the Maxi, a Stage 1 for the road and a G2 (Group 2?) for competition.
Bryan
Auckland NZ

1972 Morris Marina 1750 TC Coupe "Ozzy"

BobbyV
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Location: Brisbane Australia

Re: Leyland Marina E-Series Twin Cam

Post by BobbyV » Fri Aug 06, 2021 4:09 am

Many thanks Bryan
Will definitely look at the R-Series options and investigate getting some extractors made.
I got this car because I learned to drive in one in Invercargill as a lad.
Cheers
Bob
BobbyV
Brisbane, Australia
'74 Leyland Marina 1750 Super Sedan
'83 Ford Capri 2.8i
'82 Mercedes 280ce
'84 Holden Statesman Deville
'69 Alfa Romeo Spider
'17 Tesla Model S 75D ;)

BobbyV
Posts: 13
Joined: Mon Jan 21, 2019 10:05 am
Location: Brisbane Australia

Re: Leyland Marina E-Series Twin Cam

Post by BobbyV » Sat Aug 07, 2021 12:59 pm

Bryan,
Thanks for your help on e-series manifolds.
Given your expertise I thought I would ask if you had any insites on why my fuel pump is on the rocker cover when others are down on the block. It's a Goss pump.

Cheers Bob.
BobbyV
Brisbane, Australia
'74 Leyland Marina 1750 Super Sedan
'83 Ford Capri 2.8i
'82 Mercedes 280ce
'84 Holden Statesman Deville
'69 Alfa Romeo Spider
'17 Tesla Model S 75D ;)

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locost_bryan
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Re: Leyland Marina E-Series Twin Cam

Post by locost_bryan » Sun Aug 08, 2021 5:48 am

If you're referring to your '74, then I think it is one of the mods they did when they created the E6 for the P76. They moved the oil filter from the sump to the block, so I think they moved the fuel pump to the head at the same time.

My TC came with a later engine fitted, but with an electric fuel. I have circled what I think is a blanking plate where the fuel pump would have been on the cam cover.
WP_20150625_006_zpsrxl4nrmn.jpg
Marina Six with fuel pump on the cam cover
Image
Last edited by locost_bryan on Sun Aug 08, 2021 10:39 pm, edited 1 time in total.
Bryan
Auckland NZ

1972 Morris Marina 1750 TC Coupe "Ozzy"

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MarinaCoupe
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Re: Leyland Marina E-Series Twin Cam

Post by MarinaCoupe » Sun Aug 08, 2021 8:13 am

It’s interesting that it’s got a remote servo, rather than the factory fit servo inline with the master cylinder. Did Leyland Australia really sell the Red 6 with no servo?

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locost_bryan
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Re: Leyland Marina E-Series Twin Cam

Post by locost_bryan » Sun Aug 08, 2021 10:33 pm

My parts book lists two different servos for the early Marina. From what I can find, the servo was an option on early 4-cylinder cars, but was standard on the facelifted 1750 and Six. Not sure if it ever became standard on the TC, I have driven one without a servo.

Aussie Marina specs
Bryan
Auckland NZ

1972 Morris Marina 1750 TC Coupe "Ozzy"

KwS
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Re: Leyland Marina E-Series Twin Cam

Post by KwS » Mon Aug 09, 2021 7:10 pm

Just as an addition to this thread, the Maxi/Allegro exhaust has a big plate as a flange, which the carb manifold bolts onto

Image
Image
Image

I believe with the Maxi/Allegro manifold there can be issues with the carbs hitting the inner wing as they come straight off the head instead of tilting upwards like the Marina manifold does. I'll find out one day when i fit mine.
1973 Morris Marina Deluxe Coupe - 1750cc E Series - NZDM
https://tasteslikepetrol.net/

BobbyV
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Location: Brisbane Australia

Re: Leyland Marina E-Series Twin Cam

Post by BobbyV » Sun Aug 15, 2021 12:05 am

Thanks KWS,
the photos will be useful when I go to my exhaust shop and ask them to magic something up. Alway fun when you realise the carb upgrade has cost more than the cost of buying the car!
Bob
BobbyV
Brisbane, Australia
'74 Leyland Marina 1750 Super Sedan
'83 Ford Capri 2.8i
'82 Mercedes 280ce
'84 Holden Statesman Deville
'69 Alfa Romeo Spider
'17 Tesla Model S 75D ;)

KwS
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Re: Leyland Marina E-Series Twin Cam

Post by KwS » Sun Aug 15, 2021 10:59 am

I'd be interested to see how you get on. I think a nice set of headers coming off a flange plate would look awesome and shouldn't be too hard to do. The worst part is having to match the pipes to the square exhaust ports (you can see in the photos above they have squared off the ends of the pipe where it meets the plate).
1973 Morris Marina Deluxe Coupe - 1750cc E Series - NZDM
https://tasteslikepetrol.net/

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locost_bryan
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Re: Leyland Marina E-Series Twin Cam

Post by locost_bryan » Sun Aug 15, 2021 11:06 pm

I wonder if you could try making them "anti-reversion", without the squared off end? I recall that being the latest design for Mini extractors in the '80s, where there was a rectangular "stub" that matched the exhaust port profile, inside the larger round pipe, that was intended to prevent gases flowing back with long duration or high overlap cams.

Something like this...
Image
Bryan
Auckland NZ

1972 Morris Marina 1750 TC Coupe "Ozzy"

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