Exhaust Manifolds..

[Jhonno]

Talk to me.. Early 4.2.

Contemplating the expensive shiny ACT ones. Who runs them? Anyone dyno'd back to back compared to standard?

Or.. Better off just sticking with 4.5 ones (probably shiny ACT ones again..)?

TVR couldn't even line up the flange and the primaries properly on the standard 4.2 ones.. Got a bad crack around the flange as well. Not sure how easy/well it will weld and stay 'fixed'.

[gruffalo]

http://www.actproducts.co.uk/shop/ms16-tvr-cerbera...

I use these, very good increased mid range power and changed the noise completely.

There was a thread on here a couple of weeks ago that covered this quite well.

[Jhonno]

gruffalo said:

http://www.actproducts.co.uk/shop/ms16-tvr-cerbera...

I use these, very good increased mid range power and changed the noise completely.

There was a thread on here a couple of weeks ago that covered this quite well.

I love how yours sounds.. You popped a post in a thread of mine. Just looking for more feedback hence the specific thread.

I have found this thread since posting..

http://www.pistonheads.com/gassing/topic.asp?h=0&a...

[aide]

Jhonno said:

TVR couldn't even line up the flange and the primaries properly on the standard 4.2 ones.

I think that's deliberate and called a reversion dam.

[Jhonno]

I am not so sure considering it is only on one or 2 of them..

I'd understand if it stepped out.. Aiding scavenging etc. This is an obstruction of the primary!

I am prepared to be corrected however..

[ridds]

Indeed, more like Al's preferred port shape and Wheeler just chucked any old bit of pipe on to make it work.

Anti-reversal ratchet malarkey doesn't apply here as the step goes the wrong way.

[Jhonno]

ridds said:

Indeed, more like Al's preferred port shape and Wheeler just chucked any old bit of pipe on to make it work.

Anti-reversal ratchet malarkey doesn't apply here as the step goes the wrong way.

Yup! Step is in not out. Poor workmanship.

[Jhonno]

From my other thread..

http://www.pistonheads.com/gassing/topic.asp?h=0&a...

Jhonno said:

Byker28i said:

jackwibble said:

Mr Gruff do you have any before and after figures for the manifolds out of interest ? Would be nice to compare to standard!

343 before, 382 with jools work, then 380 swapping to the act manifolds

What was the rest of the curve like..? Did Jules redo his work post ACT manifolds? (This is the £1300 versions right?) Same dyno/similar ambient conditions?

[caduceus]

I would talk to Windsor about this (Longbow) as he's been there and done it. From memory there was an issue with them fitting correctly, but I'm sure he'll clarify it all.

[Jhonno]

caduceus said:

I would talk to Windsor about this (Longbow) as he's been there and done it. From memory there was an issue with them fitting correctly, but I'm sure he'll clarify it all.

http://www.pistonheads.com/gassing/topic.asp?h=0&t=1218244&mid=0&nmt=ACT+Stainless+Exhaust+Manifolds+

Some info in here I think..

Edited by Jhonno on Monday 18th February 09:32

[scotty_d]

I settled on act one piece stainless ones and I had them ceramic coated should be with me any day now.

[Jhonno]

scotty_d said:

I settled on act one piece stainless ones and I had them ceramic coated should be with me any day now.

How much was the coating..? Zirtec?

[scotty_d]

Jhonno said:

How much was the coating..? Zirtec?

Pm sent

[jamieduff1981]

Is it true you have to remove them to get at the spark plugs?

[scotty_d]

jamieduff1981 said:

Is it true you have to remove them to get at the spark plugs?

No but you will need a good socket set, Not to hard a job really.

[ukkid35]

The standard manifolds are quite light. That's all folks!

[Jhonno]

ukkid35 said:

The standard manifolds are quite light. That's all folks!

Too thin...?

[Jhonno]

jamieduff1981 said:

Is it true you have to remove them to get at the spark plugs?

I should hope not!! Definitely a poor design if so..

[ridds]

scotty_d said:

jamieduff1981 said:

Is it true you have to remove them to get at the spark plugs?

No but you will need a good socket set, Not to hard a job really.

You need a thin wall socket, also very strong fingers to get the plug leads back on firmly.

[jamieduff1981]

I read elsewhere (on here) that the 3 piece ACT manifolds blocked access to the plugs. Good news if that was wrong... Sounded like a bit of a non-starter!