The Lotus Grand Tourers

Hi can anyone tell me the size of ex, manifold studs please for a 2.2 Excel se 1989 Thanks

M10 for SE HC engines M8 for earlier models.

Change over point from engine number 23749.
VIN 89 D 2408
VIN 89 - 0389

Thanks for prompt reply

Ones from Ford are great for later cars, as they come with a spline drive end and copper nuts.

AndyC wrote: ↑

Mon May 04, 2020 20:10

Ones from Ford are great for later cars, as they come with a spline drive end and copper nuts.

Tell us more Andy!

Pete

I was given some by another Lotus owner who used to work for them, then later for Ford in their engine design area. These studs make it much easier to fit them, as you don't need to do the bit of two nuts locked together in order to screw them in. The ones in question are the right length for our application,but here's an image of some Fiesta ones (which may be the wrong dimensions)

Mine is a 1990 SE, and definitely M8!! 42mm long.

Just had to replace a couple, and used these off eBay - stainless, so they won't turn into rusty stumps like the old ones. They don't have the non-threaded section in the middle, so won't position the manifold with quite such micron accuracy as the originals, but a) I don't think that really matters, and b) with only 2 out of 12 studs like this it makes no difference.

'89 SE with new M8 stainless studs from Gary Kemp. Replaced all mine about 3 years ago when the engine was out for a clutch.

I have a set of stud extractor sockets so have no need for a spline type fitting. In my experience exhaust studs can require a lot of torque to remove so I would suspect it would be a challenge to remove them after years in-service using only a torx tool ..great for quick, damage-free, assembly on a factory line mind, and you can still use stud sockets when it's time to remove them so no real problem using either type.

rbgosling wrote: ↑

Tue May 05, 2020 08:33

Mine is a 1990 SE, and definitely M8!! 42mm long.

What is your engine number if you dont mind. All SEs should be M10 according to book.

Are we mixing up manifold to head and manifold to downpipe?

Pete

Pete Boole wrote: ↑

Tue May 05, 2020 17:58

Are we mixing up manifold to head and manifold to downpipe?

Pete

Think you’ve hit the nail on the head there Pete!

Sorry carlos made a mistake


The studs aren't identified by size in the parts (my version) manual, only part number. The nuts are though and as pointed out are M8.