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I supported Toymods
Location:
Berowra-Sydney
Registered:
July 2002
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Exhaust Wrap
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Fri, 26 July 2002 07:05
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you know that silicon tape you wrap around your exhaust manifold to reduce heat in the engine bay, has anyone done this to there car and if so did you notice a difference?
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Registered:
May 2002
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Location:
Montrose, VIC
Registered:
May 2002
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Re: Exhaust Wrap
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Fri, 26 July 2002 08:22
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Yeah, from what I understand its fairly effective at its job of keeping heat in. However, I also have been well told that it has the nasty habbit of keeping moisture in, thereby rotting out your manifolds far quicker than they deserve. A much better idea seems to be ceramic coating. Sure, it costs more, but then if it makes your manifold last longer rather than chewing them up at the rate of knots, I think its money well spent. Is heat a problem in your engine bay?
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Location:
Sydney
Registered:
May 2002
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Re: Exhaust Wrap
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Fri, 26 July 2002 09:16
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I used it in a 4 cyl car I had about 8 years ago.
It kept the heat out but totally ruined my extractors - constant cracking and bad rusting of all pipework covered by it.
I would not recommend it from personal bad experiences.
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I supported Toymods
Location:
Berowra-Sydney
Registered:
July 2002
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Re: Exhaust Wrap
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Fri, 26 July 2002 10:00
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nah its just the side draft webbers are right above the extractors so i thought maybe some sort of heat proofing might give it a bit more performance by stopping the engine suck in hot air. this ceramic coating, must it be done by someone or is it something you can get in a can?
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Location:
North Sydney
Registered:
May 2002
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Re: Exhaust Wrap
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Fri, 26 July 2002 10:40
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You gotta get it done, Performance Coatings in guilford do it. not too expensive.
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I supported Toymods
Location:
Berowra-Sydney
Registered:
July 2002
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Re: Exhaust Wrap
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Fri, 26 July 2002 11:08
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do i have to remove the extractors? and what kinda cost are we talking about?
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I supported Toymods
Location:
Berowra-Sydney
Registered:
July 2002
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Re: Exhaust Wrap
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Fri, 26 July 2002 11:10
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or would it be better to just put a screen of heat resistent foil between the extractors and webber?
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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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Re: Exhaust Wrap
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Fri, 26 July 2002 12:21
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Just put some cold air induction on there! This is the cheapest/easiest way!
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I supported Toymods
Location:
Berowra-Sydney
Registered:
July 2002
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Re: Exhaust Wrap
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Fri, 26 July 2002 12:51
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and how do you suggest that? in a RA23 there is no way the air can get through to the engine bay unless it runs through the radiator no where to duct cool air from only other idea is a thermofan but they are pretty costly
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Location:
Eskilstuna, Sweden
Registered:
May 2002
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 Re: Exhaust Wrap
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Fri, 26 July 2002 14:47
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A little bit of shielding between the pipes and the webber isn't going to hurt though is it. Easy to do too.
You should be able to run a piece of simple flex pipe from somewhere out the front of the car or nearer the front than the webber is now huh!
Long live the Watagans and the old Nationals track.
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Location:
Finland
Registered:
June 2002
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Re: Exhaust Wrap
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Fri, 26 July 2002 16:59
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Twin carb setup will suffer greatly when installed in an engine with exhaust on the same side.
High heat radiation will heat up carbs, and make city cruising a torment. Carbs will evaporate petrol due to heatsink effect.
In greater speeds, air draught hurdling through enginebay will greatly lessen this effect.
Very good solution is to fabricate a shield outta plain sheet metal wedged between exhaust pipes and carbs/inlet manifold.
Power gains/losses.
Scientific fact. Petrol engine will suffer a 1,5% powerloss for every 10 Celsius degrees warmer the induction air is.
This is why planning enginebay ventilation, inlet manifold isolation and 'cold air inlet' pay off. They don't increase engine power - they just assist you not to loose the power you already have.
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Location:
Cairns
Registered:
May 2002
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Re: Exhaust Wrap
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Fri, 26 July 2002 22:15
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I have used exhaust wrap previously on a 4cyl hi-po car. Noticable performance improvement at operating temperatures, but as car was driven "spiritedly" the extractors crystalised and shattered within six months.
I then made a heat shield to mount over new extractors from a sheet of manifoldite (metal/gasket stuff that standard exhaust gaskets are made of) purchased at Repco and found simmilar performance output. Only exception was at first throttle after extended idle, like in traffic, but this was improved when larger thermo fan installed.
JIMMYD
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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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Re: Exhaust Wrap
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Sat, 27 July 2002 04:23
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You should be able to fit a peice of drainage flexy pipe from the fron of the car up to the filter!
I did this on my TA22! I put the pipe from just on top of the chassis rail! There is a perfect size hole at the front just below the bumper! This is on a TA22 of cousre but I should'nt think that the xA23 would be different!
Also just a note on the C-coating, I have seen various cheap jobs that look pretty good but the coating just is'nt thick enough to do a good job! I think the wrap is value for money, although using it will fuck ya cat converter real quick but so will the c-coating!
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I supported Toymods
Location:
Berowra-Sydney
Registered:
July 2002
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Re: Exhaust Wrap
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Sat, 27 July 2002 06:30
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i've been tring to find ways to duct air towards the webbers for a long timew but the only place i can get a bit of pipe through seems pointless as the pipe is about a half inch so i can't imagine much air flow best would be to take out a headlight and that would be perfect yet i need those 
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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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Re: Exhaust Wrap
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Sat, 27 July 2002 08:14
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Are you sure there is no hole at the front where the chassis rail is?
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I supported Toymods
Location:
Berowra-Sydney
Registered:
July 2002
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Re: Exhaust Wrap
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Sat, 27 July 2002 08:21
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nope not big enough for any decent airflow, thinking of just making a shielding between the webber and extractors the running some fat pipes from behind the radiator to the webber, at least it wont be any hotter air than what its already using yet it will be gettiong more of it which has to be a plus for throtal response
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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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Re: Exhaust Wrap
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Sat, 27 July 2002 08:32
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It seems strang that the front of the RA is different to the TA!
But you could always run a ducting pipe from under the front spoiler up to your filter! This is what I did before I got the right size hose to fit in the hole i'm talking about!
Oh, and you could also make and use that heat sheild!
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Toymods Board Member
I supported Toymods
Location:
Turramurra, Sydney.
Registered:
May 2002
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Re: Exhaust Wrap
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Sat, 27 July 2002 08:47
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Hey ginsie, use one of the square holes just above the chassis rails, that the bumper bracket pokes through. There's a metal flap that sorta covers it, but that's easy to bend forward out of the way........
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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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Re: Exhaust Wrap
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Sat, 27 July 2002 08:50
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Thats the hole I was talking about! Tis what I was using in my TA22.
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I supported Toymods
Location:
Berowra-Sydney
Registered:
July 2002
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Re: Exhaust Wrap
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Sat, 27 July 2002 08:57
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i'll have another look as i've been looking for ways all the time but i'm not sure about one thing and that is i think my radiator is bigger then the original if so could that then be covering up the hole your talking about? anyway i'll have another look see if i can find this bugger. 
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Location:
Finland
Registered:
June 2002
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Re: Exhaust Wrap
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Sat, 27 July 2002 09:09
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I've had a look at this on my very old rwd Starlet. I see why this arrangement should not work.
Fabricate a baffle surrounding the radiator to minimise airflow to get around radiator. Turn edge of this baffle arrangement outwards (towards air draught). This will help air pressure buildup in front of radiator. Now we have enormous air draught capacity to cool our radiator, we should be allright even if we vent a portion of this incoming air to somewhere else.
We may remove about 20cm's of baffle arrangement edge (where it meets bonnet when it's closed). Remove this bit on that side where we have carburators. This would guide some incoming airstream (that does not pass thru radiator) directly to cool carbs.
If we want to be perfectionists, a somekinda airstream guiding tunnel arrangement may be installed on the _underside_ of bonnet.
If I'd be living in such a hot climate as Australia, I'd most likely strap on a temperature sensor on the side of my twin carb bodies. This would give real world indication on true operating environment of carbs. It would tell me what diy cooling methods work and which won't.
BTW, exhaust wraps cause fatigue to sheet metal exhaust headers due to retained heat, and this will bake carbon off the base material. No carbon - no metal like strenght.
Ceramic coating is very thin, nevertheless it works fine. It does not isolate header to cut down conductivity type cooling. It works on cutting down heat radiation. Those two are different types of cooling.
Lower temperatures (below 400 degrees Celsius) cool by conductivity. Higher temps radiate heat for cooling.
It's safe to assume that below 400 degrees, the ceramic coated header will reject as much heatsink into enginebay as an untreated header would. Above 400 degrees, the ceramic header will start to restrict heat rejection.
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Location:
New Zealand
Registered:
May 2002
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Re: Exhaust Wrap
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Mon, 29 July 2002 10:19
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hmm, what about painting the extractors with that $15 dollar spray stuff..... then wrapping?
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Location:
Canberra
Registered:
May 2002
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Re: Exhaust Wrap
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Mon, 29 July 2002 22:15
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I've been using wrap on my extrators for about a year with no problem. When I fitted the ZE, I had to redesign the no1 pipe, when I pulled the wrap off, I found no visable damage to the pipes.
I've seen extractors for a rally car that had actually crystalised under the wrap in the past, but, mine appeared fine. I read somewhere that you have to be careful to only put one coating of the wrap on, apparently, any more than one coat keeps too much heat in there.
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Location:
Canberra
Registered:
May 2002
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Re: Exhaust Wrap
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Tue, 30 July 2002 01:53
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I have Thermotech wrap on my 18RG and it's been there for 4 years with no probs whatsoever, huge difference in under bonnet temps.
I haven't had any probs with rusting or cracking pipes.
Kev
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Location:
Melbourne
Registered:
May 2002
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Re: Exhaust Wrap
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Tue, 30 July 2002 02:28
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you MUST paint them before applying the wrap and then paint the wrap aswell LOTS of paint so it fills any airgaps under the wrap and then it will not rust... READ the INSTRUCTIONS!!!
Allan
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: Exhaust Wrap
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Tue, 30 July 2002 02:35
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Would it be beneficial to do the ceramic coating AND the exhaust wrap?
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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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Re: Exhaust Wrap
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Tue, 30 July 2002 07:14
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I have just spoken to a exhaust shop and the guy reckons that there is only a problem if you dont drive the car every day! The moisture buildup will start to rust the extractors!
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: Exhaust Wrap
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Tue, 30 July 2002 16:32
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Which is solved by Allan's solution of liberally coating the things in heat-proof paint before applying the wrap then spraying it all again.
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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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Re: Exhaust Wrap
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Wed, 31 July 2002 08:17
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Exactly! I was just backing him up! Not that he really needed it.
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