View Full Version : valves query
davidbuttigieg
10-02-2010, 12:49
Tried to have a search on this but had no luck..
I know that the valves on a 1.8 are smaller then those on a 2.0 and that the ones on a 714 are bigger then those of a 700, but what are the actual sizes ? and what size are the biggest valves that can be machined to fit a 1.8 head ? 34mm ?
and the exhaust valves, are they all the same size ?
Valver inlet 30.7mm
Willy inlet 31.7mm
Megane inlet 33mm
Exhaust ones are all the same.
You can get bigger valve conversions like 34mm. I have heard of 35mm but apparently it needs a lot of work to get it right (i.e. not worth it).
Laine_16v
10-02-2010, 16:25
Putting 34mm inlets in a head is going to be dreadful on anything less than 240bhp imo.
In my opinion: a decent intake and exhaust porting (particularly at the valve throat) and a professional valve plate back modification are more important than a bigger valve.
Putting 34mm inlets in a head is going to be dreadful on anything less than 240bhp imo.
dreadful in what way?!
davidbuttigieg
11-02-2010, 15:35
Valver inlet 30.7mm
Willy inlet 31.7mm
Megane inlet 33mm
Exhaust ones are all the same.
You can get bigger valve conversions like 34mm. I have heard of 35mm but apparently it needs a lot of work to get it right (i.e. not worth it).
valve stem and length for the inlet valves are all the same ?
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