Cast iron exhaust manifolds for VP V8?
The RHS tubular exhaust manifold on the VP is leaky, just the same as every other one in the country so it seems. Is there a cast manifold from another year/model that they could be replaced with? Assuming the the Y-pipe is different, would the different pipe go straight onto the existing cat or are there differences too? Is this problem covered in one of those sticky posts? Yeah, I should have looked but I had already typed this out...
America just kicked in yo
I'm pretty sure the VP 5L comes standard with cast iron manifolds and the VN comes with the tubulars. Others can confirm or deny this
Exhaust Guru
The VN series 1 V6 came with tubular manifolds, all V8's came with cast manifolds from factory.
All VN V8's?
Righteo then.
What would you expect to pay in a wreckers?
Hand over the dog bikkies
Would you really want to do it cheap and have the risk of it doing it again? Or would you try find a cheap set of extractors? Just my 2 cents.
Welcome to the internet where people have opinions that you might not like
Fast forward 1 month, the car now has cast iron manifolds instead of the leaky, tinny sounding tube ones.
They are SO much quieter because apart from now having absolutely no leaks, the cast iron is so much thicker than the tube and so no sound comes through the walls. As in, get a pen and tap the tubing and it goes "tink, tink" but tap the iron and it doesn't make any sound, only the plastic pen striking it does.
Now... here's a question - seeing early engines came out with tube manifolds and later ones cam out with cast ones, does anyone have manufactures spec for hp/kW of these two different engines. That is to say, is there any difference in power? The car kinda feels slower but I think that's because it is so much quieter my imagination is telling me this.
Exhaust Guru
I would say someone in the past has fitted HSV tubular manifolds to it. It never came from factory like that.
The HSV version had a few more kW due to the different manifolds, exhaust and a tune.
It was a cop car in a former life. Would that make any difference?
Good to hear they're on and being well received!
I had a VN SS back in the 90's had it almost from new and it had the tubular stainless steel header type of manifolds on it, it was completely stock standard when I bought it, maybe the later V8's changed to the cast iron, but the VN V8 definitely had the stainless steel manifolds. Even shows a picture of them in the workshop manual.Originally Posted by ucwepn
I'm pretty sure the VP 5L comes standard with cast iron manifolds and the VN comes with the tubulars. Others can confirm or deny this
G'day Matt.
I only wish wish wish I had gotten that matching y-pipe off you at the same time.
A - I didn't realise it was different to my header type y-pipe
B- I didn't realise it was stainless steel and therefore as good as new.
C- I didn't realise a new one costs the best part of $600. I mean, damn!
The exhaust place got a new y-pipe but the tapered end on the rhs one was malformed somehow and they couldn't stop it leaking so they made some kind of hybrid out the new lhs and my old rhs. Its only been on 3 days and its started to leak where the pipe goes on the manifold. Grrr! But they're a reputable place so I'm sure they will eventually fix it okay.
i had 6 vn vq v8s in my time and they all had factory tubular ones
Yeah I never even realised there were different headers used between the models!
That seems like a crazy price for a simple y-pipe, bloody ripoff merchants! At least if they are a reputable place, then yeah, they'll get it all sorted for you i'm sure. At that price, they'd bloody well want to though!
FWIW the only change in power output was with HSV option including MEMCAL/CIA/Knock sensor and exhaust.
IMO cast headers will do the same job to any other extractor on the street, it would have been nice to get a before and after power figure but it maybe just that it is quieter as you said and it "feels" slower.
If you were racing then for sure buy the best extractors you can afford.
America just kicked in yo
Maybe all the VN V8's had the tubulars because Holden were not tooled yet for the cast manifolds? According to the book Project VN the whole program was rushed.
Wot a luvverly picture!
And that book - I didn't know it existed so now I am going to get one.
America just kicked in yo
Fantastic book with lots of lovely prototype photos and the whole story of the VN, for instance the first prototype vn interior was fitted to a falcon for evaluation purposes haha.
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