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MG MGB GT V8 Factory Originals Technical - Factory V8, cracked manifold
|I finally got my brakes working OK (who designed the mountings for the master cylinders cover? They need a slap!) and fitted my new exhaust.|
I ordered a replacement stainless system, that uses the standard manifolds (couldn't quite stretch to tubular manifolds at the moment). However, There's a small crack in one of the stud mounts (where manifold meets exhaust). Fortunately, I was able to drop a bolt through the hole for the stud, and clamp it all together adequately. It looks as if it ought to work OK, but only time will tell.
Couple of questions:
- I've heard these manifolds are prone to cracking, but where do they normally crack?
- Are these manifolds common to any other vehicle? Are they different to Land/Range Rover manifolds? I thought I'd ask, so I know what to look for at an autojumble.
They are unique to the factory MGB V8 and I have a pair with cracks. One of these cracks is exactly where you describe. The castings are very thin.
However they can be repaired by a specialist welder prepared to repair cast manifolds. Repairs are generally quite effective.
|They do come up occasionally, but only slightly more often than rocking-horse poo.|
Tubulars have their own problems including cracking, warping, down-pipes falling off them ...
|But tubulars are 100 times easier to R & R!|
|I have one piece of rocking horse poo - I think it is the LHS manifold - available for what it cost me (a customer changed his mind!) |
If anyone is interested I will check which side it is - e-mail me.
|Chris at Octarine Services|
|One of the problems was that the manifold could expand & press against the block where the engine number casting is.......If it's in the same place as an SD1 that would be between 2 middle N/S cylinders.....it might be worthwhile checking that you have clearance there.|
Cast manifolds in good condition are very rare...I did see a pair for sale at Silverstone but no price on them........one of my friends has just built a V8 roadster using exclusively V8GT parts, and he had to have the manifolds welded.......me... I'll stick to stainless RV8 manifolds.
|Thanks for all the replies. At the moment, the exaust is pretty quiet and I like the sound. I guess I'll keep an eye on them, and perhaps have them repaired if possible, or replace them with tubular ones if it's not cost effective to have them welded.|
This thread was discussed between 25/08/2004 and 26/08/2004
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