Club126UK
Fiat 126 Chat => Tuning & Customising 126 Models => Topic started by: eben80 on January 02, 2012, 08:43:09 PM
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Evening guys. Has anyone done some exhaust manifold & head matching? The standard castings seem to have a lot of excess metal. The cast-iron elbows are surprisingly well matched to the gasket. I don't expect much but I suppose every little helps. Scribed the lines for the die-ginder.
(https://lh6.googleusercontent.com/-ttzQI54bngQ/TwIUcBLDiRI/AAAAAAAAMLQ/NLFl_vBu8UI/s800/DSCF9695.JPG)
(https://lh6.googleusercontent.com/-zS9HShHv_tQ/TwIUTuflzmI/AAAAAAAAMLA/FP2RitHjOII/s800/DSCF9696.JPG)
(https://lh5.googleusercontent.com/-wNXhhUO2n2s/TwIUelkUFVI/AAAAAAAAMLY/QLR7sPvaZiw/s800/DSCF9692.JPG)
Staying with the ports... should I be worried that the intake valve guides are protruding so far into the port? How would you normally cut them if you need to?
(https://lh3.googleusercontent.com/-qA8f4mi4yRw/TwIUaAZwXZI/AAAAAAAAMLI/-ThqFi1SSRo/s800/DSCF9698.JPG)
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it seems the the blitz boys have been removing all that protrudes how true this is i cant confirm.
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ideally you would remove the guides, get some new ones, turn them down in a lathe and then fit those.
It could be A significant improvement at higher valve lifts. Removing the guides may be a specialist job though, probably need to heat the head plus have a press.
The best reference I am aware of for the theory and practice of cylinder head modification is david vizard's book 'tuning your a series engine' although he does also have an earlier book called 'theory and practice of.....'
Even though it is about the a-series engine, it tells you what you would need to know to attack any kind of conventional tuning program, especially on a pushrod engine like the 126.
GAV