What is this aftermarket exhaust system
Discussion
The manifolds look like JP versions though as others have said, the Y piece isn't something I've seen before.
The evidence for them being JP is in the last comment on this thread
The evidence for them being JP is in the last comment on this thread
The manifolds look similar to mine
see link for more info
https://tvrgriffithcerbera.wordpress.com/2018/09/1...
precat
see link for more info
https://tvrgriffithcerbera.wordpress.com/2018/09/1...
precat
Its highly likely the above are 'Peninsular TVR' manifolds, I have a mate with these manifolds, see my comments here:
https://www.pistonheads.com/gassing/topic.asp?h=0&...
According to Tim at ACT 'Peninsular TVR' manifolds were offered many years ago and became the template for the ACT de-cat sports (MS13) manifolds, my mate discussed all this directly with ACT and how the conversation was relayed to me it sounded like Tim bought sole manufacturing rights from 'Peninsular TVR', some improvements were made and so were born the ACT MS13 manifolds.
My mate who has these so called 'Peninsular TVR' manifolds may be selling them, he lives in London and since fitting them his car has ended up a bit too loud for that environment.
The manifolds TVR designed in late 1994/early 95 to accommodate catalytic converters are by far the most common but must be shockingly inefficient, look how short the front header pipes are compared with those serving the rear cylinders, their lengths couldn't be more unequal!
The manifolds on Pre-Cat Griffs are not perfect by any means but compared with the later TVR cat equipped efforts shown above I can only imagine they must be massively more efficient. To me a Rover V8 in a Pre-Cat Griff always sounds way better and idles smoother than later cars, I'm not talking noise or even tone which are both better too, I'm just hearing a happier engine.
I doubt Peninsular manifolds and the ACT MS13s that evolved from them are that much more efficient than TVRs own Pre-Cat Griff manifolds, but the Y piece (collector setup) is another story, both the Peninsular and the ACT Y/Collectors look to do a far better job of what TVR gave Pre-Cat Griff owners.
Personally if I was upgrading I'd go the full hog and implement one of the crossover setups available that pairs the cylinders that fire 180° degrees apart to follow the natural firing order of a 90 degree cross plane V8, as proven as far back as the 1960's such systems offer far superior exhaust gas scavenging.
I believe Clive Ford offers two such setups, one full house fully equalized length setup which is obviously going to be expensive due to it's complexity.
And one less complex version that may not be as perfectly equal length as above but will be considerably less time consuming to make and so cheaper to produce and consequently less costly to buy.
Recently we've seen another variation on the 180 degree crossover manifold concept from Lloyd Specialist Developments which simplifies the concept even further, the downside being in terms of header pipe length they are effectively returning to something akin to what you get with the TVR Pre-Cat, Peninsular and the ACT MS13s.
Saying that the above design from Lloyds is rather elegant in it's simplicity and in theory this should make it the most cost effective design to buy?
Personally I'd like to see a bit more of an equal header length, my favorites for this equal length goal that are balanced with a simpler construction design are what I call the 'Hump Backs' which are rare but you do see them from time to time.
The above is a poor image, mostly because the manifolds are wrapped but you can just make out whats going on, the front two header pipes are lifted quite considerably to increase their otherwise naturally short length, hence my name 'Hump Backs', this design goes a long way to equalize all four header lengths in a way that is probably the simplest to fabricate.
I'd love to see a set of 'Hump Backs' paired with the Lloyds simple but elegant crossover Y/Collector arrangement, it's still not going to be a match for Clive Ford's full house equal length crossover 180 degree masterpiece but in terms of construction complexity, cost and performance I would have thought such a hybrid arrangement should deliver the best overall compromise
the first version of my tuned equal length, opposing firing order manifolds also had 4 secondary pipes later merging 2 into 1 to the exhaust under the car,
these are no longer made as the cost was out of most peoples reach at £2700+vat,
the new version see below, is actually simpler to make as there are only 2 secondary pipes, but because of this the headers look busier as your trying to fit 4 pipes into 1 secondary, plus they are a little bit cheaper at £2200+vat. both systems were tested on Joolz dyno and gave good returns.
a video can be found on my facebook page, the exhaust note being much crisper on these manifolds, and more responsive.
www.facebook.com/clivefppa
these are no longer made as the cost was out of most peoples reach at £2700+vat,
the new version see below, is actually simpler to make as there are only 2 secondary pipes, but because of this the headers look busier as your trying to fit 4 pipes into 1 secondary, plus they are a little bit cheaper at £2200+vat. both systems were tested on Joolz dyno and gave good returns.
a video can be found on my facebook page, the exhaust note being much crisper on these manifolds, and more responsive.
www.facebook.com/clivefppa
clive f said:
the first version of my tuned equal length, opposing firing order manifolds also had 4 secondary pipes later merging 2 into 1 to the exhaust under the car,
these are no longer made as the cost was out of most peoples reach at £2700+vat,
& they’re still going strong Clive. Gave me 35 hp I think.these are no longer made as the cost was out of most peoples reach at £2700+vat,
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