Rover v8 plenum volume
Discussion
Was hoping to get a Thor inlet manifold good for a 4.0 tvr fitment and then do a back to back road test to see if theory works in practice.
Problem I have is my Griff is a 500 and my j reg Range Rover doesn't give a good road test compared to a tvr lol.
So back to the drawing board and back to a proper dual plane inlet manifold.
Just wondered if someone into the engine mods could confirm volumes to calculate plenum size for our lovely rover v8 engines.
Having a throttle body per cylinder is a track race car thing which is ott. So next best thing is possible a dual plane inlet with a throttle per two cylinders and running an air filter.
So a plenum per bank so to speak.
I work 7 days a week in a toolroom and it gets boring. So I'm thinking, make the most of the machines and expertise around me.
The Clive f exhaust manifolds are also on the list but I can't make those, I can make the inlet manifold though.
My 500 is Taraka spec so already has lovely flowed heads and balanced combustion chambers as I bought it but I want to add my own touch now and finish off a well modded road engine
That's the plan
Problem I have is my Griff is a 500 and my j reg Range Rover doesn't give a good road test compared to a tvr lol.
So back to the drawing board and back to a proper dual plane inlet manifold.
Just wondered if someone into the engine mods could confirm volumes to calculate plenum size for our lovely rover v8 engines.
Having a throttle body per cylinder is a track race car thing which is ott. So next best thing is possible a dual plane inlet with a throttle per two cylinders and running an air filter.
So a plenum per bank so to speak.
I work 7 days a week in a toolroom and it gets boring. So I'm thinking, make the most of the machines and expertise around me.
The Clive f exhaust manifolds are also on the list but I can't make those, I can make the inlet manifold though.
My 500 is Taraka spec so already has lovely flowed heads and balanced combustion chambers as I bought it but I want to add my own touch now and finish off a well modded road engine
That's the plan
GEMs plenum is only slightly bigger than the hotwire version. Just the ends are square.
Side by side:
https://flic.kr/p/U7x5g2
Side by side:
https://flic.kr/p/U7x5g2
Always was led to believe that a lot of people have fitted a plenum spacer to the standard plenum to up the volume and have seen gains . If yours is Taraka spec itll already have a 72 mm inlet and i think a different spec of trumpets or a blended base I suppose a blended base would increase the volume more as no trumpets in the way , im sure the spacer gives something like 15%extra volume . The search feature on here will probably show up a lot on the subject .
Toma500 said:
Always was led to believe that a lot of people have fitted a plenum spacer to the standard plenum to up the volume and have seen gains . If yours is Taraka spec itll already have a 72 mm inlet and i think a different spec of trumpets or a blended base I suppose a blended base would increase the volume more as no trumpets in the way , im sure the spacer gives something like 15%extra volume . The search feature on here will probably show up a lot on the subject .
It's got act inlet throttle bodies, so not a good start to measure standard volumes 
The info I've been reading is interesting, but nothing I've found is rover v8 specific.
I think I'll remove the 3.9 inlet off my old rangie and use that as a start point if I can't find any relevant info.
If you want volume you could weld a box onto each side of a stock plenum and use a single or twin throttle arrangement. With packers inside you could experiment with volumes. A base plate could be used to lengthen the inlet tracts.
You'd be able to get some baseline figures before swopping parts around.
You'd be able to get some baseline figures before swopping parts around.
Boosted LS1 said:
If you want volume you could weld a box onto each side of a stock plenum and use a single or twin throttle arrangement. With packers inside you could experiment with volumes. A base plate could be used to lengthen the inlet tracts.
You'd be able to get some baseline figures before swopping parts around.
I was thinking of building something with adjustable volume and it was pointed out on another thread about firing order which is something else to incorporate. It will take me a while to get something together from scratch but it's all doable You'd be able to get some baseline figures before swopping parts around.
My only real headache is can aftermarket management systems incorporate catalytic converters as my car is a 95?
long time thread resurrection
never really heard it said that plenum volume should equal engine volume, but a general rule is to not have it smaller than the engine volume, though what difference it makes you would only find out by testing.
In general though a large volume with plenty of pressure recovery would work well especially if you have anything upstream which is restrictive eg small throttle, air flow meter...
never really heard it said that plenum volume should equal engine volume, but a general rule is to not have it smaller than the engine volume, though what difference it makes you would only find out by testing.
In general though a large volume with plenty of pressure recovery would work well especially if you have anything upstream which is restrictive eg small throttle, air flow meter...
Nothing came of this unfortunately, basically I suffered a stroke but with recovery and what not the project got put on the back burner and when I was getting back to normal and thinking of starting this my job is ending and being made redundant so my work toolroom facilities will be no more
I’m not sure of my future job at the moment
I’m not sure of my future job at the moment
RobXjcoupe said:
Nothing came of this unfortunately, basically I suffered a stroke but with recovery and what not the project got put on the back burner and when I was getting back to normal and thinking of starting this my job is ending and being made redundant so my work toolroom facilities will be no more
I’m not sure of my future job at the moment
Sorry to hear that but hope all turns out well for you.I’m not sure of my future job at the moment
8Speed said:
RobXjcoupe said:
Nothing came of this unfortunately, basically I suffered a stroke but with recovery and what not the project got put on the back burner and when I was getting back to normal and thinking of starting this my job is ending and being made redundant so my work toolroom facilities will be no more
I’m not sure of my future job at the moment
Sorry to hear that but hope all turns out well for you.I’m not sure of my future job at the moment
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