Roadster LWB Marina 1.8 TC air filters and preventing carbs from over heating

[Ye Ol Ripper]

[Ye Ol Ripper]

With regards to the original post. I also have an 1800TC engine but am still running the original 1&1/2 " Su's.
If you are now running TR7 carbs, the needles within are likely to be incorrect, especially as the engine is nolonger using the original airfilters.

I am using the original Marina steel heatshield with original spacer blocks. I am using airfilters that have foam inserts trapped between an inner & outer wire mesh.

It is a very tight fit to get the front filter on place, so be prepared to have a few stab points on your finger tips .
A useful tip ,If you hold your fingers as far above your head after , the bleeding will stop pretty quickly unless you have a clotting disorder.

When I first used my Roadster after an 1100 hour restoration, it did suffer with vapour lock on my eay around the M25 after attending the Suffolk club meet.
The temp was above 28 degrees. My Marlin was down to 30mph as I managed to keep it going on the inside lane of the M25 with Lorries etc thundering past. It was pretty a scarry experience tbh!

[listerjp2]

You can get low profile stub stacks that will fit inside and air filter
MED STUB STACKS | MED (med-engineering.co.uk)
Should have read to the end of the thread before posting

You could use these and just have some wire gauze behind them to catch the larger bugs.

Adrian

[john cole77]

You can get low profile stub stacks that will fit inside and air filter
MED STUB STACKS | MED (med-engineering.co.uk)
Should have read to the end of the thread before posting

[redmonty]

Try this its only 3cm deep, may even fit the left hand carb.

By the way, although it says for Hif44 it will fit the 6.

Adrian

Wow that looks interesting. Thanks for looking this up.

[listerjp2]

Try this its only 3cm deep, may even fit the left hand carb.

By the way, although it says for Hif44 it will fit the 6.

https://www.somerfordmini.co.uk/ram-pipe-silver-30mm-long-hif44-1-34-su

Adrian

[redmonty]

In order to avoid a bonnet bulge for the side draught carbs on the Alfa engine on my old Roadster I made up a box that just fitted in the space between the carbs and bonnet and ran a large diameter flexible plastic pipe from underneath to the front of the engine bay and fitted a decent air filter. .

Thanks for the info and pics. More food for thought. Lovely looking engine BTW.

[dcunn]

Message sent........please look at top right of your screen for "Notifications"

Thanks DC

[ggrum]

Dunno why the photos appeared three times!!

[ggrum]

In order to avoid a bonnet bulge for the side draught carbs on the Alfa engine on my old Roadster I made up a box that just fitted in the space between the carbs and bonnet and ran a large diameter flexible plastic pipe from underneath to the front of the engine bay and fitted a decent air filter. The photo should give a rough idea of the layout. Without a filter some fine dust will enter the engine and eventually cause some internal wear but with the typical mileage that most Marlin owners do It probably wouldn't be a problem as suggested by listerjp2 unless you spend a lot of time driving through deserts.


IMG_4429.jpg

[listerjp2]

[QUOTE=redmonty;n116382]

Hiya mine is the very flat trumpet as shown in picture below but this is the limit to that supplied by Burlen

That is really useful to see, thanks. I wonder if the trumpet could be shortened for the LHS carb and re welded? Or would they supply the trumpet unattached to the base plate... Hmmm?

Hadn't thought of that option, would need to be TIG welded as they are aluminium.

Adrian

[redmonty]

[QUOTE=listerjp2;n116377]Hiya mine is the very flat trumpet as shown in picture below but this is the limit to that supplied by Burlen

That is really useful to see, thanks. I wonder if the trumpet could be shortened for the LHS carb and re welded? Or would they supply the trumpet unattached to the base plate... Hmmm?

[redmonty]

You've got plenty of room in there to create your own air box with a filter at the back of the engine bay

Thanks AndyF, I had given that some thought too, but the amount of room for the connection to the left hand carb is very shallow with bonnet on, so was looking to see if there was something else I could do.

[listerjp2]

Hers a very untidy under bonnet shot of my pervious Marlin with tea strainer

[listerjp2]

Hiya mine is the very flat trumpet as shown in picture below but this is the limit to that supplied by Burlen