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Post by jonnyb on Nov 18, 2022 19:35:32 GMT
I am thinking of removing the oil bath filter and replacing with K+N air filters attached direct to the carbs. However, the rocker cover breather vents into the oil bath air filter at present. This breather can't be connected to the K+N filters so I am looking at other options. 1. Cap the tube coming from the rocker cover. 2. Take a hose from the rocker cover down beside the engine in a similar manner to the breather from the vented cam cover. 3. Cap the rocker cover tube and use a vented oil filler cap instead. 4. Connect the rocker cover tube to the inlet manifold with a hose. 5. Fit a small filter to the rocker cover tube. I am not sure of the effects of these changes but hipefully knowledge or experience will be available here. Cheers Jonathan
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Post by 2robert4 on Nov 18, 2022 20:27:48 GMT
I have used MGA Filters which are a direct fit and have the breather connection too. You will need to re needle as the engine will run too weak as the air bath filter cuts the air flow down so a weaker needle is required in that application. I used an MGA standard needle then adjusted at idle when warm and road tested to see any performance problems. Hope this info is of some help? NP
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Post by canuck on Nov 18, 2022 20:54:55 GMT
I am thinking of removing the oil bath filter and replacing with K+N air filters attached direct to the carbs. However, the rocker cover breather vents into the oil bath air filter at present. This breather can't be connected to the K+N filters so I am looking at other options. 1. Cap the tube coming from the rocker cover. 2. Take a hose from the rocker cover down beside the engine in a similar manner to the breather from the vented cam cover. 3. Cap the rocker cover tube and use a vented oil filler cap instead. 4. Connect the rocker cover tube to the inlet manifold with a hose. 5. Fit a small filter to the rocker cover tube. I am not sure of the effects of these changes but hipefully knowledge or experience will be available here. Cheers Jonathan
Hello Johnathan, Advice if I may? 1) don't do this. The crankcase needs to vent 2) this can be done, or simply drill a 5/64" hole in your existing cap? Caveat, not reversible. 3) I wouldn't and if you do, put a filter of sorts on it 4) don't do this. You will risk sucking oil into the combustion. You will have mega regrets. 5) a great many owners do this filter thing, I think it looks odd. I did a refit as Nigel mentions. I fitted MGA Vokes filter cans, with a twist. I installed K&N filter elements and decided to use MGB air filter base plates to improve airflow into the carburetters. Air doesn't like rounding sharp corners. A bonus is the MGA filter cans have an allowance for the rocker box vent hose. All works as the factory design expected to and improvement in air flow. Be prepared for induction 'noise' . I think these MGA filter cans keep the in period under bonnet look. I published how I did this in a 2011 edition of the RMC Record. Have a read if interested. Bruce
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Post by jonnyb on Nov 20, 2022 19:54:44 GMT
Thanks Nigel and Bruce very helpful.I'll post again when I get round to it. Having just got the car I am working through a long "to do" list.
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Post by vue from the north on Dec 6, 2022 11:39:08 GMT
Option2 have a length of hose hanging down just bellow bottom of engine & fit the k& n but don’t put the foam in the mesh in between the chrome casings, or the other option is fit carb extensions in a blower Bentley style & leave it sucking raw air in (like me) it really depends how far you want to go with the car, I’m running a Peter burgess tuned engine bigger exhaust so the thing needs to suck in plenty of fresh air !
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Post by jonnyb on Dec 13, 2022 18:33:59 GMT
Some progress on this. I have picked up a set of early MGB filter cases with the breather tube on the front can. These have the backplates that smooth the flow into the carbs and I can use the standard paper filters or K+N ones. This will thus retain the original breathing arrangements with tube from rocker cover to front filter case as on MGA. I will start with standard paper filters (cheap) to prove it works. Not sure about needles Standard Riley AD or Rich Riley AR or Standard MGA GS. However, I think the choke system on the H4s isn't functioning properly. The choke operation is very stiff, even with a new cable, and I suspect the jet movement is perhaps stiff due to the cork seals, which I believe go hard? I have made a wooden former to bolt onto the fronts of the carbs so I can remove them and investigate while they are held in their correct respective positions by the former. No point in tuning carbs until I know the choke operation is correct. Also need to look at high speed idle as cam does not seem to be giving much effect with choke operation. Thoughts/advice welcome as usual.
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Post by canuck on Dec 16, 2022 16:59:27 GMT
Some progress on this. I have picked up a set of early MGB filter cases with the breather tube on the front can. These have the backplates that smooth the flow into the carbs and I can use the standard paper filters or K+N ones. This will thus retain the original breathing arrangements with tube from rocker cover to front filter case as on MGA. I will start with standard paper filters (cheap) to prove it works. Not sure about needles Standard Riley AD or Rich Riley AR or Standard MGA GS. Standard paper filters are just fine and FWIW have more pleats than 'fancier' elements. Keep in mind that the oil bath filter has a reduce opening or restrictor for air flow to the crankcase, as well the early MGB did the same This is important to keep intact. salut B
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Post by jonnyb on Dec 16, 2022 18:05:18 GMT
Thanks Bruce. I have just come in from the garage, after fitting the MGB air filters, to find you had posted. I did indeed notice the restrictor on the breather and did not interfere with it. I had to shorten the snorkels to avoid clashes with the battery and radiator but I am happy with the result. I took it out for a local run on unsalted roads and all seemed well. Now I can get down to sorting the choke and setting up the carbs from scratch.
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