71 replies to this topic

[sonscar]

Where is your brake servo getting vacuum from,as said above the breathers should vent into the inlet before the charger.Good eyeballing required I think.Steve..

[sam138]

I’ve got the brake servo connected up as per below pictures as most others do on the supercharger, the servo still has the non return valve fitted as standard.

Should I connect up the crankcase, DSN filter on old fuel pump and rocker cover filter to the carb breather pipe directly as one ?



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Edited by sam138, 20 July 2021 - 09:52 PM.

[sam138]

I’ve got a suck through m45 supercharger set up and was wondering how people have piped up there breather systems ?

I was going to run the crankcase, rocker cover and the DSN filter ( on old fuel pump hole) and connect them all into the breather pipe on hif 44 carb ? Or should these all go to a catch can and block off carb breather.

Current set up below with crankcase breather to carb with stand alone filter on old fuel pump hole.


Reason I ask is that I’ve got oil leaking out of the clutch seal and I’ve seen a few people mention a build up of oil pressure with the supercharger cussing this.

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Edited by sam138, 20 July 2021 - 10:59 PM.

[GraemeC]

High oil pressure can NOT cause oil to push past the seal - there is no pressurised oil anywhere near it.

 

Still think you’re chasing a problem you don’t have. The compression test results are OK. 

[sonscar]

I would connect all the breathers to the intake side of the charger.The crankcase should be under suction in a fit motor properly vented.Steve..

[Icey]

You’re not putting boost pressure into the breather system, are you?

Edit: It looks like this question was asked before but I’m not seeing a clear response. Your breather system should only ever see vacuum.

I’ve got the crankcase breather connected to the hif44 carb and a DSN filter on the mechanical fuel pump with a stand alone filter, neither of these would cause boost pressure in the breather system would they ?

No, shouldn’t do. So I’d pull the flywheel and check/replace the seal.

[sonscar]

Is your oil filler cap vented?The breather system should draw a metered supply of air through a hole in the filler cap(which is a service item I believe)I would sort out the breather system first before pulling the motor but that is just my way.A few drips would lead me towards letting it develop as you say it was ok before charging it.Your car,your choice.Steve..

[Dusky]

You’re not putting boost pressure into the breather system, are you?

Edit: It looks like this question was asked before but I’m not seeing a clear response. Your breather system should only ever see vacuum.

I’ve got the crankcase breather connected to the hif44 carb and a DSN filter on the mechanical fuel pump with a stand alone filter, neither of these would cause boost pressure in the breather system would they ?

Depends where it's hooked to the hif44 and if it's low through or suck through.

[nicklouse]

I’ve got the brake servo connected up as per below pictures as most others do on the supercharger, the servo still has the non return valve fitted as standard.

Should I connect up the crankcase, DSN filter on old fuel pump and rocker cover filter to the carb breather pipe directly as one ?



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655950F5-C986-45FF-8F39-310A3A4F22C7.jpeg

6C03D054-49B5-4A18-8D4E-5B18F712B4F9.png

All breathers should go to the low pressure side of the intake so carb or plenum. 

[Midas Mk1]

When the seal goes trust me you know, slipping clutch and oil pouring out of the split pin, not a drop, literally pouring out. Had a dodgy minispares seal fail on me this year, fitted correctly with the correct tool.

[sam138]

Thanks for the reply’s, the set up is a suck through supercharger unit.

Just a bit of an update as I’ve added a rocker cover breather pipe and linked this into a Y piece with clutch breather and connected this to carb.

I’ve run the engine to normal temperature today and not one drop of oil is coming out now, do you think best to still pull the clutch and replace ? I’ve not physically driven the car as it’s off road at moment.

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Edited by sam138, 21 July 2021 - 09:43 PM.

[Steve220]

Connect everything from the right of the engine (as you look at it) to the rocker cover. Then connect the transfer case and rocker cover to a vented catch can. Block off the carb.

[Spider]

I've merged your topics and changed the thread title as they are inter-related.

[Steve220]

Seeing more of your breather pictures, they're not big enough. The A series has a lot of turbulent air in it, ideally ½" ID from each of the breathers. I'm running a 1" pipe from the rocker cover to a catch can.

[sam138]

Thanks for the reply’s, so I definitely shouldn’t have it all connected to the carb ? As a few have said this.

Steve, I was going to tee the crankcase and DSN fuel pump breather into the oil catch can then return via rocker cover feed ? Or should I have two holes in the rocker cover and tee on in with the crankcase as a breather ?

Edited by sam138, 24 July 2021 - 11:24 AM.