3.8 SU manifold on 4.2 series 2 - water connections

Technical advice Q&A

Topic author
tim wood
Posts: 1200
Joined: Fri Nov 20, 2009 6:52 pm
Location: Leighton Buzzard UK
Great Britain

#1 3.8 SU manifold on 4.2 series 2 - water connections

Post by tim wood » Fri Jan 12, 2018 5:34 pm

Hi all,
I have an imported series 1.5 fitted with Strombergs and using a series2 type cooling system.
I can also have a set of triple SUs on a 3.8 manifold. It can fit these and sort the throttle connections and the issue of extra core plugs needed at the head joint but the 3.8 manifold has 2 large water inlets whereas the radiator only has the 1 connection.

Has anyone done this before and what are the secrets?

If all else fails I can sell my cleaned and blasted 3.8 manifolds and buy a 4.2 but would rathe not at this stage

Assistance appreciated

Tim
Series 1 FHC purchased 40 years ago. Courted my wife in it.
Series 1 2+2 when the kids were small now sold.
Series 1.5 OTS in opalescent maroon, Californian car. My retirement present.

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Doug Buchan
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Location: Beach Haven, NJ
United States of America

#2 Re: 3.8 SU manifold on 4.2 series 2 - water connections

Post by Doug Buchan » Sun Jan 14, 2018 2:45 pm

Hi Tim,
There should only be 1 large outlet which is the thermo housing. The other outlet on the water rail is small and that's part of the bypass circuit which connects via a right angle hose to the top of the water pump. On the series 1.5/2, the factory returned to the superior 3.8 type bypass circuit (along with an improved thermo housing) as IMO, the series 1 4.2 was not a very good design.

There is an excellent thread somewhere on this forum re: modified thermo housings to suit a proper sleeve type thermostats.

Regards,
Doug
Doug
'67 ots

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Topic author
tim wood
Posts: 1200
Joined: Fri Nov 20, 2009 6:52 pm
Location: Leighton Buzzard UK
Great Britain

#3 Re: 3.8 SU manifold on 4.2 series 2 - water connections

Post by tim wood » Sun Jan 14, 2018 4:46 pm

Thanks Doug, very much appreciated. I,ll have a look later. Hopefully that’s sorted it.

Tim
Series 1 FHC purchased 40 years ago. Courted my wife in it.
Series 1 2+2 when the kids were small now sold.
Series 1.5 OTS in opalescent maroon, Californian car. My retirement present.

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ralphr1780
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Belgium

#4 Re: 3.8 SU manifold on 4.2 series 2 - water connections

Post by ralphr1780 » Mon Jan 15, 2018 9:45 am

Tim, if it can be of help I can gladly take couple of pics of the same setup on my S1 3.8.
Ralph
'69 OTS + '62 OTS - Belgium

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