4age 20v - When are heavy duty valve springs required?

**Sam_Q** · 17-09-2007, 07:44 PM

do these problems extend to 16v engines?

**shelldrake** · 18-09-2007, 09:14 AM

Just got a part number for TODA valve springs.
Full set to suit 4age 20v : 14750 - 101 - 000
Quoted $260+post

They have to come from Japan though....

**Mr Revhead** · 19-09-2007, 03:28 PM

TRD still available.....
p/n 10309-AE001

**Sam_Q** · 19-09-2007, 04:26 PM

what would they cost revhead?

ed · 23-09-2007, 08:37 AM

Originally Posted by Celica RA45

this is for edd
You will find that you cant get much more duration before the VVT mechanism stops working. It relies on the camshaft accelerating off the back of the lobe to click it into the advanced position. Once you get to a certain duration the cam is pickup up the next cylinder before it falls off the previous one.

i thought you found the vvti issue was sorted after something with the oil? youre running higher duration cams than me glenn, and your vvti still works?

**Celica RA45** · 28-09-2007, 05:44 PM

ed this is vvt not vvti and its not worth using vvt on the 20 v when you go up in duration and lift ,as middle valve gets in the way and its hard to fly cut it any deeper