Pre cat manifolds on a serpentine

[plasticman]

I was looking at putting some pre cat exhaust manifolds on to my 5 litre griff ( with power steering ). It looks like I am going to have to get another swirl pot made up so wondered if it has been done before and if there was an easier way , thanks , David

[spend]

You could convert to electric PAS, pre-serp swirl pot, and JE style alt bracket... if front end clearance is the issue. Ant has posted various pictures of his front end (ooerr!) which is much like that with his serp upgrade.

[Ant.]

Its the way forward.......

[plasticman]

Hi spend , thanks for that , but I was looking for an EASIER way !

[FactBV]

I think there was a red factory test car that had lots of different engines fitted over the years and when the guy bought it, it had a 500 engine and 500 cooling system fitted although it was originally a pre-cat. He returned it to pre-cat manifolds and I am sure that there was a write up on this in the book, the TVR Griffith Story. I'm travelling at the moment but will have a look when I get back.

Peter

[dnb]

How about something like this for increasing front end clearance & revised cooling system?

[spend]

What about thinking around the Cerb / P38 style remote stat so you can just pipe the coolant ahead of the manifolds. A swirl tank to separate air near the rad should be OK as long as the expansion tank is nice still nice & high like Daves shows?

ETA: I'm still not clear in my mind if the 90 deg bend in the manifolds will clear the serp ancills? - that big bit on the alt bracket to hang AC & even the PAS housing...

Edited by spend on Sunday 14th August 07:49

[Pasco]

Bloody Hell your up early for a Sunday Spendy

[plasticman]

Hi dnb , that looks fantastic . I understand the cooling system is based on a subaru one . Unfortunately I don`t want anything japanese on MY car so will be unable to replicate your system . It looks like I will make a shorter swirl pot with the bottom half remaved .

[Pasco]

They are ACT Manifolds not pre cat are they Dave ?

[dnb]

They are indeed Paul. Not sure how much good they do, but it was better than welding up cracks in the standard manifolds every other month.

What's up with Japanese parts Plasticman? I generally find them to be simple and well production engineered - the exact opposite of British things - fantastic design principles but no effort made in QA and production engineering. (I prefer to use off the shelf parts for my mods if I can get away with it)

You could easily duplicate the ideas having a proper stat bypass, self bleeding radiator and more sensible pressure relief without using a single Japanese part if you desired.

[FlipFlopGriff]

FactBV said:

I think there was a red factory test car that had lots of different engines fitted over the years and when the guy bought it, it had a 500 engine and 500 cooling system fitted although it was originally a pre-cat. He returned it to pre-cat manifolds and I am sure that there was a write up on this in the book, the TVR Griffith Story. I'm travelling at the moment but will have a look when I get back.

Peter

That was Dave's (mack on here) car, Jenny or 284JNN. Used in very early promotional work - most famously pictured next to an aircraft - maybe a Tornado (from memory)?
FFG

[spend]

FlipFlopGriff said:

That was Dave's (mack on here) car,

You're right about Macks car Paul, if I'm not mistaken his 'pre-cat' manifolds were a custom job from JP though?

I bought his old 'new' manifolds & had them converted to bolt-up flanges by Trick at JP, largely on the back of Daves' glowing reports about them

[FactBV]

FlipFlopGriff said:

That was Dave's (mack on here) car, Jenny or 284JNN. Used in very early promotional work - most famously pictured next to an aircraft - maybe a Tornado (from memory)?
FFG

That's the one. The picture of the repositioned swirl tank to clear the pre-cat manifolds is on page 107, bottom right hand corner. Looks very neat.

[topsparks]

plasticman said:

I was looking at putting some pre cat exhaust manifolds on to my 5 litre griff ( with power steering ). It looks like I am going to have to get another swirl pot made up so wondered if it has been done before and if there was an easier way , thanks , David

Dave would that be the ones you have hanging up in your garage collecting dust!,hows that creation with all that carbon and honeycomb doing I saw?.

[plasticman]

No , these are the ones I had kicking around on the floor collecting dust . The T400 is moving along slowly , hopefully ready for next Chatsworth.
I am sure there is nothing wrong with japanese parts , just my version of what Peter Wheeler once said about german components .