New ACT MS13 manifolds .

[SILICONEKID 345HP 12.03]

My car made 357hp and about the same torque (just
under 360 anyway)

Dyno read out to come ..

[phazed]

What was it before Daz?

[Matthew Poxon]

That is a great result Daz, well done. Looking forward to seeing the graph and of course the compulsory picture of your engine bay with the new shiny pipework.

[LongBaz]

phazed said:

What was it before Daz?

At a guess 345

[phazed]

I got another 12+ with mine iirc.

[JamsD]

Do they have a boss for a wideband fitted

[Classic Chim]

I’m fairly sure you can ask to have one welded in before purchase but you’ll need to check.

[phazed]

Any boss you like! Just specify.

[N7GTX]

Here's a pic of the cat equipped manifolds (MS14) showing the lambda sensors

https://www.actproducts.co.uk/product/ms14-griffit...

[SILICONEKID 357HP]

[Matthew Poxon]

Interesting you have gained a fair bit of top end horsepower but lost a bit of mid range torque. In theory the longer primaries on those manifolds should result in more torque.

Almost 360BHP out of a 5 litre is very impressive.

What cam do you have?

[phazed]

Mine did exactly the same.

Gained horsepower and spread the hp out longer.
Increased the torque slightly further up the rev range and lost a little lower down.

[900T-R]

phazed said:

Mine did exactly the same.

Gained horsepower and spread the hp out longer.
Increased the torque slightly further up the rev range and lost a little lower down.

All desirable traits on a 5L

Quite unexpected, as the primaries are longer and a tiny bit smaller diameter (1 5/8" rather than 1 3/4" apparently, this would only become a restriction at around 400 bhp I've been told, so spot on for an RV8) - this leads me to believe these represent a skilful balance based on a bit of dyno development/real world data.

Edited by 900T-R on Friday 7th September 15:31

[TwinKam]

900T-R said:

phazed said:

Mine did exactly the same.

Gained horsepower and spread the hp out longer.
Increased the torque slightly further up the rev range and lost a little lower down.

All desirable traits on a 5L

Quite unexpected, as the primaries are longer and a tiny bit smaller diameter (1 5/8" rather than 1 3/8" apparently, this would only become a restriction at around 400 bhp I've been told, so spot on for an RV8) - this leads me to believe these represent a skilful balance based on a bit of dyno development/real world data.

Did you mean 1 5/16"...?

[Podie]

How do these differ to Clive F's offering?

Price wise, they ain't cheap...

[QBee]

Daz won’t be bothered about price......he’s a plumber.

[Classic Chim]

Podie said:

How do these differ to Clive F's offering?

Price wise, they ain't cheap...

Probably not by much unless it’s the equal length ones which sort of look cheap when you look at the detail involved.
The numbers don’t change much but the easier breathing must be good for the engine overall I’d have guessed.
If I could afford some I’d have them purely from a vanity perspective which is why Daz has em I reckon

ETA Daz is after faster times for the 1/4 mile I believe so worth it if he gets what he wants. I would too

Edited by Classic Chim on Friday 7th September 13:33

[Podie]

QBee said:

Daz won’t be bothered about price......he’s a plumber.

[900T-R]

TwinKam said:

Did you mean 1 5/16"...?

Sorry, I meant 1 3/4" for the OE ones. Amended my original post now

[SILICONEKID 357HP]

I've not heard it yet but loosing the bucket Y piece gets rid of the clatter noise around the engine bay and gives a nicer sound out the back .

I have money coming back for the Y piece and manifolds .looking

I don't have any money because accountants are very expensive Anthony 😋

Edited by SILICONEKID 357HP on Friday 7th September 18:46