96discoI said:
Please guys and gals, if heat is all you are worried about, just get fireproof sleeves for the spark plug wires. I have been running low octane 87 since sleeving my plug wires and never had a problem with heat again.If you coat manifolds doesn't that keep the heat inside to warp the heads? just a thought. anyway, I also had to pull off the manifolds to retap the bolt holes to a slightly larger and consistent thread pattern. rover bolts are so weird that they even got a mention on the movie 'Cars 2'. The rover is the villain that is leaking oil everywhere and Tow Mater speaks of the bolts that 'aren't metric or standard'. It took about 2 years for my bolt job to even begin to loosen from the heat. this can be done by hand with the proper reamer tool because the heads are aluminum. Just one case here, I am not saying that it will work for everybody but it beats all the work and money if all you need is less heat and manifold leaks. I would put my quiet exhaust up against any rover, old or new. good luck, all
It may be about heat, but that's not the entire picture. The objective is to remove it as quickly as possible, while containing it until it's out of the engine bay. Catalytic converters haven't made that any easier. Treated manifolds won't soak as readily, and improve the evacuation process as a result.
I've ceramic coated mine inside and out. Not only does it keep the heat in the exhaust stream, it eliminates rust. The coating will not increase the probability of warped heads. It will reduce it. You are moving the heat away, instead of allowing it to soak dissimilar metals in contact with each other.
The manifolds are still hot, naturally, but more heat energy is allowed to leave the engine bay. Further improvement can be gained with tubular headers, but only if they are properly designed, assembled, and coated.
If you want to wrap your wires, it's your prerogative. I personally find the wrap becomes annoyingly dirty over time after dusty and muddy driving, and it's damned near impossible to clean. Those sleeves won't do anything to get the heat out of your engine bay, either. Simple wires with proper insulation, tight connectors, and good plugs will alleviate most issues.
Cheers,
Kennith
