MG-Cars.net

Welcome to our resource for MG Car Information.

Recommendations

Parts

MG parts spares and accessories are available for MG T Series (TA, MG TB, MG TC, MG TD, MG TF), Magnette, MGA, Twin cam, MGB, MGBGT, MGC, MGC GT, MG Midget, Sprite and other MG models from British car spares company LBCarCo.

MG MGB Technical - Special Tuning Stage III Questions

Does anyone have any experience/comments about the following. Would it make a good modified street engine? This is the factory Special Tuning Stage III spec.

18GB engine, +.040

port and polish head (lightly)

balance crank, flywheel, clutch cover, damper

AEH 714 Cam (io 24 BTDC, ic 64 ABDC, eo 59 BBDC, ec 29 ATDC), .250 cam lift, .358 valve lift

dual 1.75in SU carbs (.100 jets, SY needles, light blue springs)

Either mill head 1/16" or use flat top pistons

The compression ratio should be about 9.7:1 and the engine should produce 105bhp - 108bhp @6000rpm.


An alternative is to mill head 1/16" and fit flat top pistons.

The compression ratio should be about 10.5:1 and the engine should produce 112bhp - 115bhp @6000rpm.

Please let e know what you think.

Thanks,
Mike
M Edmonds

M-
Keep the compression ratio close to 9:1 or you'll have a problem with preignition. Today's oxygenated gasoline dislikes any more compression than that when it's being compressed in our primitive kidney-shaped combustion chambers.
Steve S.

Go to +60 (1868cc)

Gas flow head - must include 3 angle seats - best to buy a stage 2 head from Peter Burgess or similar.

Skim head 25 thou.

Fit a Piper HR 270 cam

K&Ns on standard 1 1/2 inch SUs using AAA needles

Should produce 87 bhp at the wheels - roughly 120 at the engine
Chris Betson

Keep the compression closere to 9:1. Life will be much better. I have problems at 9.5:1

Pete
Pete

This thread was discussed between 27/01/2002 and 28/01/2002

MG MGB Technical index

This thread is from the archive. The Live MG MGB Technical BBS is active now.