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MG MGB Technical - Porting

When I found these books by this chap Peter Burgess, I thought, Wahoo, this very kind gentleman is releasing all the secrets! I read both books from cover to cover, And being reasonably skilled with my hands, thought, What the hell I can do this! Anyway I have been a bit enthusiastic with the porting, and managed to break through into the pushrod hole. Whoops! or rather the word I used was more unkind. Now Peter uses bronze sleeves for his big ported heads ( Dare not let him see this, anyone who knows him, please tell him there is not much to see on this forum page!)
Presumably one has to bore the pushrod hole bigger, press the sleeve in then adjust the port wall again? Obvioulsy for the; ahem, professionals! Anybody else done this silly thing, or was it just me? thanks Mike
J.M. Doust

Hi Mike

Unless you have tried to increase the port for competition use you have got overexcited and gone too far without measuring. It is fairly awkward to drill the hole true to take a larger sleeve as the drill tends to follow the hole in the port....steady wins the day. Press in an oversize sleeve, again be careful as the sleeve will try and go into the port as you press it in, not too long as you only need to cover the hole. Blend the tube as best as you can into the port. Careful you don't go through again, leave a slight hump.

If it cheers you up, A series 1275s are worse :)

Most people, me included when I started porting heads around 1977, tend to attack what is easy to get at and forget the harder to get at places. These places, namely the short side of the port where the turn into the seat and chamber is tightest require the most TLC to get the power from the head. Three angle seats are a must.

Good luck and join the club....wait till you get overzealous and grind under the fire ring in a chamber and have to throw all that lovely work away.

Peter
P Burgess

Both books? I only have How To Power Tune MGB. What is the other one?

Charley
C R Huff

... I have thoroughly read both of Mr. Burgess' books "How to Power Tune MGB 4-Cylinder Engines" and "How To Build, Modify, And Power Tune Cylinder Heads,"

from here http://www.sterlingbritishmotoringsociety.org/files/mgbtunings.PDF
Geoff E

Thanks Goeff. I didn't know that Peter had written a book dedicated to cylinder heads.

Charley
C R Huff

Damn! I had the master himself tell me off! Actually no, Thanks Peter for the input I am enjoying it, and apart from this mishap ( and it is only on the one port, one side.) I should be able to recover. Thanks again Mike
J.M. Doust

Peter, note your comment about a steady hand! Mike is a Dentist..I bet the drills came in handy!
Gary Lock

If Mike is a dentist, then filling that hole shouldn't be too difficult!

Mike (Not a dentist)
Mike

The main additional element in the other book is a good guide about how to build and run the maths for you own flow bench.

Because the book expects you to use the maths the flow bench design is simpler that some others I have seen where you have to build in suction control so as to adjust to the same absolute pressure drop each time.
David Witham

This thread was discussed between 21/02/2011 and 24/02/2011

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