Rover V8 forum ?

[VladTepes]

Originally posted by Pedro_The_Swift
Hmmm,, a home build??

I would LUV to be able to rebuild my 3.5 in a garage,,,,

So what's stopping you :?:

You can use my shed, just BYO tools. [img]style_emoticons/<#EMO_DIR#>/laugh.gif[/img]

[Pedro_The_Swift]

Originally posted by adamv8

Pedro - what do you mean "weld up the combustion chambers" ?

adam

its a way of gaining compression, you are basically adding metal back into the combustion chamber.

its not simple and its not cheap
but it WILL give you more compression when the heads are starting to look a little thin,,
not for the faint of heart :wink:

[adamv8]

That is interesting ! - I will check some datails conc "welding up the combustion chambers"...that's very interesting !

Inlet manifold: providing 4 brl, easy to tune and economical carby is desired, I can choose: Weber 500 or Edelbrock 1404 (500ccm too). (Weber 500 is actually the same or almost the same as Edelbrock, Weber belongs to Edelbrock, but Weber has excellent "name" in Europe, so its sold there as Weber, not as Edelbrock). Holley - not for off-road and too hard to tune. There are some less known (Rochester, Carter), but I don't know details...
Mentioned Weber 500 or Edelbrock 1404 need Weber inlet or Edelbrock Performer inlet (the same again?) or Offenhauser inlet.
I don't know any other to fit with those 2 carbys.
Or am I wrong ???
adam

[shaunp]

A Rochester Quadrajet is the go I reckon, GM fitted them to 308s and small blocks, blue 253s also had them as well. They work well and are spread bore so you can drive them on the primarys all day and save fuel, pull open the secondries and you have 780cfm more than a Rover will ever use.

Talk to Dean Tighe at Tighe Cams in Brisbane he has a couple of good grinds for 4x4 use in Rovers. Dean and his Dad Ivan are big in the MG hillclimb seen here and as a result have some knowledge of this engine and what it needs.
www.tighecams.com.au

3.9 heads have bigger valves and would be my pick as a basis for a new engine as well as the 3.9 exhaust manifolds. I'd be inclined just match port the heads and manifold, bell them a bit behind the valves in throats and clean them up around the guides. Stick a cam, carb and exhaust on it and it will be fine.

[DirtyDawg]

Adam,
I purchased this book, link:www.reviewcentre.com/reviews25101.html
and found it most helpful when making decisions on what to do with my 3.5 stiff block......
[img]style_emoticons/<#EMO_DIR#>/smile.gif[/img]

[Pedro_The_Swift]

I awill leave this here so people get to read it again,,

Originally posted by shaunp
A Rochester Quadrajet is the go I reckon, GM fitted them to 308s and small blocks, blue 253s also had them as well. They work well and are spread bore so you can drive them on the primarys all day and save fuel, pull open the secondries and you have 780cfm more than a Rover will ever use.

Talk to Dean Tighe at Tighe Cams in Brisbane he has a couple of good grinds for 4x4 use in Rovers. Dean and his Dad Ivan are big in the MG hillclimb seen here and as a result have some knowledge of this engine and what it needs.
www.tighecams.com.au

3.9 heads have bigger valves and would be my pick as a basis for a new engine as well as the 3.9 exhaust manifolds. I'd be inclined just match port the heads and manifold, bell them a bit behind the valves in throats and clean them up around the guides. Stick a cam, carb and exhaust on it and it will be fine.

[img]style_emoticons/<#EMO_DIR#>/biggrin.gif[/img]

"I 'd be inclined to just match port the heads and manifold, bell them a bit behind the valves in throats and "

ShaunP,, please explain about the "Bell behind the valves in throats",,

[shaunp]

Just like it sounds grind the throats to a bell shape and blend any intrusions in the ports as much as possible. For example valve guide bosses in the castings of heads get ground away if your fair dinkum. You remove the giude first grind away the bosses and refit the guides. Some times you can also cut the guides off flush with the port wall but this depends on head design. When grinding the valve troats you also generally thin the valve seat as much as possible which gives a larger hole when the valve is open even though effectivly the valve is the same size. Rover engines have pretty small ports but these are small engines and are only going to move so much air anyway. It's important to remember the big ports can lead high fuel usage at low speed and if your running stock injection there is only so much fudging you can do like uping the pressure and fudging the airflow meter output etc. Rover engines in 4x4s do respond very well to the correct cam and extra compression even if you do nothing else. My favorite production head is the JAG XK head these heads even though the original design was from the late 40's was still good in the 80's when they stopped using them and is probably better than some heads even today. Twin cam, Hemi, shim adjust valve lash with cams running straight on the valves ,no rockers. Easy to port, the "straight port " ones flow good air out of the box, if you take the valves out you can look in the inlet port and see out the exhaust. The basic design fitted to the cars won Le mans 5 times in D types and C type sports cars. Lovely to work on if you know what to do easy to wreck if you don't.

[RRuted]

Adamv8 , where are you located? From your singnature i would say Zimbabwe ? A mild port job on the heads as well as matching the head and manifold ports will go a long way to improving acceleration and fuel flow, a decent dizzy will help too. What year is your car ? is it a rangie or landy. Later model efi exhaust manifolds and a good 2 1/2 " single system is the best for a performance increase - twins are only for show.

[Hellspawn]

Twins are only for show ? Only when they're on a WRX.

[adamv8]

I am located in Victoria, I really have 20 meters to lake - can catch some dinner through window [img]style_emoticons/<#EMO_DIR#>/biggrin.gif[/img]
My Landy is SIII Stage One V8 1984, with Zenith_Stromberg carbys.
But...I will probably buy classic Range soon too, the same engine [img]style_emoticons/<#EMO_DIR#>/smile.gif[/img]
adam