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MG MGB Technical - K&N Filters and Ram Pipes

Hello,
My car is basically a stock 73 MGB that I have been restoring. However, when we redid the engine we did put in a slightly higher performance cam.
The question I have concerns the K&N air filters and the High Performance ram pipes. I have had some people tell me these would really add to the performance of my car.
Do any of you have this set up and is it worth the cost - approximately $225 USD? Will I be able to tell a difference in the performance? What are the negatives of this setup?
Thanks for your comments.

Robert
Robert Browning

hi i changed 3 items to a standard engine k&n (not pancake chrome type)knmg240 which use standard back plate,these do not use trumpets.remember to change the needles in the carb to triple A .you will benefit by changing the exhaust sytem but i would not bother with large bore, i went for a performance header and standard bore exhaust system . i get a nice tone go for one bullet box and one baffle box purchased from moss made by falcon and not expensive. the last thing i did was throw the dizzy away and get your self aldon 101by2 with electronic ignition around 100 pounds, i would say the lot would cost you about 350 pounds and will transform yor car thanks daren
daz

i have added to the list above ,fitted a peter burgess fast road head and a piper 285 cam but the rest of the engine is standard producing another 32 bhp which now gives me 97 bhp at the wheels daz
daz

The filters I have been looking at are the 3" deep, Moss Part #222-950. The Ram Pipes are the 1 1/2" SU Carbs - Moss Part #222-970.

I have already put in a new dizzy or distributor with the electronic ignition. I have also looked into the different exhaust, but everyone says to do one thing at a time, but do the air filters and the ram pipes first.

Why would I need to change the jet needles to Tripe A?

Thanks,

Robert
Robert Browning

Robert: The stock Cooper cans seem to be a little restrictive, so when open filters are installed the carbs will flow a little more air. Most cars with HS-4 cards can be tuned with the jet adjuster, cars with HIF 4 carbs usually have needles that are very lean in the mid range for lower emissions, turning the jet screws may not be enough. I had to change needles in my 74 when I switched to open carbs. I used AAA needles as Joe Curto suggested.

David Vizard in Volume 2, How to Build Horsepower,Carburetors & Intake Manifolds ran some SU carburetor tests with ram pipes and found a short 3/4" eliptical flange pipe flowed better than any long ram pipes he tested. The original SU back plate adapter is similar to the short stack he tested, the longer ram pipes may not help.

Clifton
Clifton Gordon

Robert -
Moss sells a nice MGB-emblazoned plate with K & N filters which works with your standard radius plates. In other words, you won't need stub stacks with this set-up. It flows better, I think it is mentioned in Burgess' "How to Power-Tune MGB 4-cyls".
You may have to switch to richer needles - this will also depend on your exhaust set-up.
Hope this helps
Martin
Martin Connolly

This thread was discussed between 24/05/2006 and 25/05/2006

MG MGB Technical index

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