Fitting Tubular Manifolds

[Seaking]

John

Go and buy some you will have sp much fun fitting the day will fly past and at the end if the day a big smile knowing that it did not beat you.
I would deal with Phoenix direct it will save you around 20% of costs.

Cheers Glenn

[KOY 23]

My shaft is 18mm not sure if that is thick or thin?

[Stagdad]

Isn't the point of fitting tubular manifolds to improve gas flow? If so wouldn't you need to match the exhaust ports to the manifolds to ensure there are no steps or bumps to cause turbulence?

On this point I don't know how good the phoenix ones are but the inlet ports seem very poor in the std manifolds. You can see when the manifold is removed tell tale signs of steps in the old gaskets.

[mjheathcote]

Would be easy to change the collector to 2" on my manifolds, with both running forward and then vertically down. If the results are worthwhile , could modify my spare second set...
What about the holes through the rear suspension, would require making bigger I expect (if not Bmw E30 rear end of course).
Regarding matching, I matched both inlet and exhaust ports to the respective manifolds/gaskets. Just one thing of many when 'blueprinting' an engine.

[new to this]

My shaft is 18mm not sure if that is thick or thin?

John

On the newer ones they have changed the design,you have more room on the steering shaft,on one of the pipes there's a flat spot where they have cut it for more clearance, you will then need 2inch exhaust all the way through with an x-pipe see your not the only one that was listening to Richard Lane

Dave

[new to this]

Would be easy to change the collector to 2" on my manifolds, with both running forward and then vertically down. If the results are worthwhile , could modify my spare second set...
What about the holes through the rear suspension, would require making bigger I expect (if not Bmw E30 rear end of course).
Regarding matching, I matched both inlet and exhaust ports to the respective manifolds/gaskets. Just one thing of many when 'blueprinting' an engine.

Mike

you can get 2 inch pipe through the subframe arms,it is tight

Dave

[flying farmer]

I have been putting together another graph on engine torque outputs and exhaust manifolds, I shall be posting on the performance tuning the Stag engine thread shortly.

Neil

[Motorsport Micky]

Would be easy to change the collector to 2" on my manifolds, with both running forward and then vertically down. If the results are worthwhile , could modify my spare second set...
What about the holes through the rear suspension, would require making bigger I expect (if not Bmw E30 rear end of course).
Regarding matching, I matched both inlet and exhaust ports to the respective manifolds/gaskets. Just one thing of many when 'blueprinting' an engine.

Yeah, like fitting piston rings with the gaps staggered, I used to do that too.

Regarding manifolds matching check out "beneficial mismatch". Turbulates the airflow and allows greater carrying of fuel droplets, on a Mini worth gobs of power. On Tr4 and TR7 V8 we now make the manifolds about 3mm smaller dia to use the step.

Micky

[Kevin Garrod]

My shaft is 18mm not sure if that is thick or thin?

John, from memory the thicker shaft is cast and the thinner one welded so it should be obvious which you have. I posted pics a long time back, a search may bring them up, but bear in mind it would have been on the old forum. Sorry but I'm unable to re post the pics (you know why)

[KOY 23]

Thanks Kevin, hope life is getting better for you. My shaft is cast.

[Kevin Garrod]

Thanks Kevin, hope life is getting better for you. My shaft is cast.

Things are good John, it's just taking ages to sell the house.

[Marco Polo]

Towards the end of completing mine, I have spent the past two days going two steps forward, three steps back! Finally got both of the manifolds installed. I used new bolts, cleaned the threads, prayed and swore !! Just got to reinstall the rack, steering shaft and fit the pipes now. I had access to a car hoist and all the tools that my career as an Aircraft Engineer could wish for ! Worst job that I've ever done on my car, those extra ponies better be noticeable!!! My advice, get someone else to do it!
Regards,
Raoul

[STypeR]

The guy who had my Stag before me fitted a four branch manifold, and the plonker had trouble with the steering shaft so he ground a groove around the shaft. When "Ben"at Robsport saw it he was horrified and said all they do is shim the engine over a bit on the engine mounts easy fix, bet it wasn't !There is not alot of room down there. They did fit a new shaft when they rebuilt the engine I still have the old shaft think I will keep it as a reminder how not to treat a Stag .
Derek

I will need to do that on mine as it is touching the steering shaft. Do you know what type of profile shim they have used on your car?

[Marco Polo]

I will need to do that on mine as it is touching the steering shaft. Do you know what type of profile shim they have used on your car?

The guy at Robsport gave me two shims when I bought my pipes they are approx. 1.2 mm thick and are from Triumph Spitfire front suspension they fit between the rubber and the mount that is bolted to the engine. The best way to describe them would be a slotted plate open at one end.
regards,
Raoul