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Ebay inlet manifold **plz read**
- Thread starter john182rs
- Start date
The principle of opening up and polishing inlet manifolds is well known and proven.
I was doing just this sort of tuning to MGBs in 1966. The idea is to increase the smooth flow of the mixture by reducing the resistance caused by the cast surface on the inside of the manifold.
Having said that, two things would concern me about the offered item.
We used to match the head/gasket/manifold/carburettors at all the joints so there was a smooth and consistent size through the inlet tract, followed by gas flow checks.
You can not, in my opinion, buy parts to match the bits on your car precisely thus the benefits may not be achieved, you could in fact make things worse.
I would therefore be suspicious of the gain in performance they claim by just adding the part and I am not sure how "reflashing the ECU" will help.
I agree it’s a starting point in tuning but it’s certainly not a quick way to increase performance unless you machine all the adjacent parts to match, accurately.
If I were you, I would buy your Mum a nice present for Christmas and run the car on premium fuel, cost you a lot less than £250
I was doing just this sort of tuning to MGBs in 1966. The idea is to increase the smooth flow of the mixture by reducing the resistance caused by the cast surface on the inside of the manifold.
Having said that, two things would concern me about the offered item.
We used to match the head/gasket/manifold/carburettors at all the joints so there was a smooth and consistent size through the inlet tract, followed by gas flow checks.
You can not, in my opinion, buy parts to match the bits on your car precisely thus the benefits may not be achieved, you could in fact make things worse.
I would therefore be suspicious of the gain in performance they claim by just adding the part and I am not sure how "reflashing the ECU" will help.
I agree it’s a starting point in tuning but it’s certainly not a quick way to increase performance unless you machine all the adjacent parts to match, accurately.
If I were you, I would buy your Mum a nice present for Christmas and run the car on premium fuel, cost you a lot less than £250
Last edited:
Edde, if you read my post again you will see I was not disputing the principle, what I was casting doubt on was the possibility of achieving the claimed result by doing only part of the work required.
I know modern manufacturing techniques and materials have improved the quality of cast components but the fact remains, without careful matching of the inlet chamber (or throttle bodies) and the manifold to head joint and even the head itself, its all hit and miss.
We used to remove nearly 3mm of metal round the MGB inlet manifold casting and head where they joined and probably .5mm off the entire internal surface just to get rid of the casting roughness.
Then we would polish the joint with the head/manifold assembled (and the valves removed) through the valve openings. We then took the joint apart and using paper and machine blue we would cut and shape the gaskets to match precisely.
Exactly the same procedure would be done at the carburettors and then the whole process repeated for the exhaust outlets. The gains were measurable but as a % of the output of the engine, nothing like the 10% claimed for just changing one component.
I know modern manufacturing techniques and materials have improved the quality of cast components but the fact remains, without careful matching of the inlet chamber (or throttle bodies) and the manifold to head joint and even the head itself, its all hit and miss.
We used to remove nearly 3mm of metal round the MGB inlet manifold casting and head where they joined and probably .5mm off the entire internal surface just to get rid of the casting roughness.
Then we would polish the joint with the head/manifold assembled (and the valves removed) through the valve openings. We then took the joint apart and using paper and machine blue we would cut and shape the gaskets to match precisely.
Exactly the same procedure would be done at the carburettors and then the whole process repeated for the exhaust outlets. The gains were measurable but as a % of the output of the engine, nothing like the 10% claimed for just changing one component.
All well said and done but ive spent loads on her already. Im looking at furthering the cars performance with mods of £500 or less each, im not going for major high power performance mods as at the moment i currently have a little mini that would walk all over any clio, so whats the point, i just want my clio to sound and look nice thats all.If I were you, I would buy your Mum a nice present for Christmas and run the car on premium fuel, cost you a lot less than £250
