manifold dilema

robbie b · Post by **robbie b** » Sun Sep 07, 2008 5:55 pm

Can any one help me solve my manifold dilema?
I am in the process of buying a series 1 4.2 ots and I can't decide which manifold to fit.
I asked Harry to fit a full stainless steel exhaust system to the car before I took delivery, he recommended the classic fabs full system, I took his advice and opted for the "short manifold"
After joining the forum and having looked at posted pictures of the systems fitted to members cars I changed my mind and asked Harry to fit the "long system" as I thought it looked better.
Now I have been reading that the "long system" is recommended for engines that have been uprated while the "short system is recommended for standard engines and, there are issues of the system burning paint on the frames and bonnet if the manifold is not wrapped.
As the engine in my car is standard, and I intend to keep it that way, will I notice any difference and will there be any detrement fitting the "long system to a standard engine, or should I change my mind (again)

Post by **Heuer** » Sun Sep 07, 2008 6:56 pm

Firstly these manifolds do not need to be wrapped with DEI or similar heat proof webbing. You can do so if you want and it will lower under bonnet temperature together with increasing the temperature of the exhaust gases which helps the extraction process. I researched it but decided the wrap was not needed unless you are going to race the car. It is also a pain to put on and has a kit-car look so I did not bother. These manifolds will not produce enough heat to damage your bonnet paintwork but they may cause blistering of the adjacent frame rail. I fabricated a clip-on shield which seems to do the job:

The alternator shield is supplied as part of the system and I did suggest to Ian Stewart of Classic Fabs he fabricate and supply a frame shield as well. Just a bent bit of aluminium or stainless sheet with a couple of Jaguar square frame clips to hold it on.

The 'long' system is complex to make and therefore more expensive which is why almost all other manufacturers opt for the cheaper 'short' manifold. The long manifold is however the most efficient type of extractor manifold (the short is a compromise for easy fitting and cost) so you have chosen well even with a standard engine. The Classic Fabs manifold/exhaust is superbly engineered and you have a choice of two venturis which can be fitted during installation - standard and 'Swiss', the latter reducing exhaust noise considerably. The former speeds up exhaust gases as they enter the silencer which reduces resonance but allows the cat to roar. Make sure one or other is fitted.

I have driven 2,000 fast miles on mine since May without any problems whatsoever to the paintwork. Stick with the long pipes, relax and enjoy the ride. Harry and Classic Fabs know their stuff so you will not be mis-guided.

robbie b · Post by **robbie b** » Sun Sep 07, 2008 7:10 pm

Thanks v much for your advice, I am going to stick with the long system as the look is so much better and i have no intentions of racing the car (Harry will be relieved I am not changing my mind again)

I will try and source fabrication of a heat sheild for the frame as blistered paint will cause me sleepless nights!!!

Having watched lewis hamilton win at spa only to get a retrospective 25 sec penalty for trying to overtake another driver relegating him to 3rd, racing all seems a little unfair anyway

Post by **Heuer** » Sun Sep 07, 2008 9:26 pm

Let me know if you need construction details. I used a couple of frame brackets from SNG and two seat spacers to distance the shield from the frame. Probably overkill but I stuck some Reflect-a-Cool on to the aluminium shield for good measure (product via Demon Tweaks). Nothing elaborate and, actually, probably not needed on a road car.

robbie b · Post by **robbie b** » Mon Sep 08, 2008 7:27 am

ok thanks, I am going to speak to a friend of mine in the fabrication business. Do you mind if I use the photo of your car as a reference?

Post by **Heuer** » Mon Sep 08, 2008 11:45 am

Go ahead. My plate is 21"x7" with a 1.5" 'lip', two top corners rounded to look tidy. I stuck this stuff on for extra protection: http://www.demon-tweeks.co.uk/products/ ... =DEI010460
I used two of these to attach it to the frame: http://www.sngbarratt.com/catalogue/par ... s=0&back=n and two seat runner spacers to distance it from the frame (part number BD17648) as I had them spare - a few washers would serve.

robbie b · Post by **robbie b** » Mon Sep 08, 2008 7:15 pm

thanks i will post details when i have the heat sheild made

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