extractor manifolds

[boxer]

I am going to fit a Holly carb shortly and would like to fit extractor manifolds at the same time the bit that worries me is there looks to be very little room around the manifold nuts to remove and refit can it be done

[martinhosepro]

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I fitted tubular manifolds with the heads still on the engine,

It was not easy & involved cutting down spanners & fitting some of the studs with the manifolds in place,

Also involved is a lot of bad language.

[V Mad]

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I have found the bad language invaluable. The louder the better. Trouble is I get strange looks from the neighbours. :shock:

The manifold bolts are not as tight as I expected. They dont seem to sieze in the Al heads (wish I could say the same for the head studs. )

[boxer]

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I get the impression from the 2 replys i,ve had that it can be done with the heads in place i really dont want to disturb the heads as i have only just bought my stag and the engine has been completely rebuilt. Are some extractors easier to fit than others the rimmer ones look good value but i,m open to suggestions

Bob

[mjheathcote]

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I think there is presently only one manufacturer of manifolds at the moment, 'Phoenix', so just buy at the best price.

[Bob Heritage]

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mjheathcote wrote:

I think there is presently only one manufacturer of manifolds at the moment, 'Phoenix', so just buy at the best price.

Confirm what Mike has written don't know if it's made by Phoenix or Double 2 though. Bought mine from S.O.C. Spares which was cheaper than Rimmers sale price.

Bob



By the way the offside nut above the oil filter is an absolute bugger.

[boxer]

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Bob Heritage wrote:

mjheathcote wrote:

I think there is presently only one manufacturer of manifolds at the moment, 'Phoenix', so just buy at the best price.

Confirm what Mike has written don't know if it's made by Phoenix or Double 2 though. Bought mine from S.O.C. Spares which was cheaper than Rimmers sale price.

Bob



By the way the offside nut above the oil filter is an absolute bugger.

Tried to contact soc this morning no reply presume they dont open on sat can you remember what you payed for them?

Bob

[alan_thomas]

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I'm going to give you a different view on tubular manifolds and ask why you want to fit them?

There are 2 answers you could give, more power and 'looks good underbonnet'. I cannot think of any more answers you could give. If you want the latter then go ahead and change them but if you are doing it for more power I would question the sense of fitting them.

The manifolds you can buy are not tuned extractor pipes those lengthhas beenoptimised to 'extract' the exhaust gases as soon as the exhaust valve opens. The reason is they are restricted in their design by the space available, they do give the gases an easier path and give a small power gain but you have to offset that against cost, unbonnet temp (unless you wrap them), difficult fittingand even less space around the engine.

If you wantto see an extractor exhaust with correctly tuned pipe length look at this. The guy made a racing stag for the Australian Production car race series.

[StagnJag]

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that reminds me of that windows pipes screensaver:P

[CotswoldClassicCarHire.com]

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My '77 Stag has the holley and the manifolds - huge difference when dyno'd - and, yes, much swearing and bloodshed. Tight fit, certainly: had to loosen the engine mounts just to gain a few vital mm, but really worthwhile job.

[CotswoldClassicCarHire.com]

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Don't buy the Rimmer version unless they can confirm that it's Phoenix - they also have some cheap chinky ones sometimes - call E J Wards - they stock only Phoenix.

[boxer]

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alan_thomas wrote:

I'm going to give you a different view on tubular manifolds and ask why you want to fit them?

There are 2 answers you could give, more power and 'looks good underbonnet'. I cannot think of any more answers you could give. If you want the latter then go ahead and change them but if you are doing it for more power I would question the sense of fitting them.

The manifolds you can buy are not tuned extractor pipes those lengthhas beenoptimised to 'extract' the exhaust gases as soon as the exhaust valve opens. The reason is they are restricted in their design by the space available, they do give the gases an easier path and give a small power gain but you have to offset that against cost, unbonnet temp (unless you wrap them), difficult fittingand even less space around the engine.

If you wantto see an extractor exhaust with correctly tuned pipe length look at this. The guy made a racing stag for the Australian Production car race series.

Isuppose i come from the school of thought that what goes in must come out so if you have an existing manifold which is described in the Triumph Stag conception,development and birth by the writer as"the worst designed exhaust manifold ever"i think that is the best thing to do.When i had my tr6 i fitted a full phoenix system but didnt wrap the extractor which although looked the dogs in the engine bay was in hindsight i think a mistake.If i do end up fitting extractors to my stag i will wrap them although i know they would look nicer without .

Bob

[Big J]

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boxer wrote:

If i do end up fitting extractors to my stag i will wrap them although i know they would look nicer without .

Bob

Have 'em ceramic coated.

J

[Arbman Al]

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Big J wrote:

boxer wrote:

If i do end up fitting extractors to my stag i will wrap them although i know they would look nicer without .

Bob

Have 'em ceramic coated.

J

Er....remind us how much they were again Big J?:shock:

[sjm]

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arbman101 wrote:

Big J wrote:

boxer wrote:

If i do end up fitting extractors to my stag i will wrap them although i know they would look nicer without .

Bob

Have 'em ceramic coated.

J

Er....remind us how much they were again Big J?:shock:

Hi Al,

If I remember I think it was only 5p on a pint and 10p on a short

Steve