Fiat Coupe 16 VT trackday-cruiser

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TurboB
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Fiat Coupe 16 VT trackday-cruiser

Post by TurboB » Tue Jun 12, 2018 9:06 pm

This is my Fiat Coupe 16vt trackday car in action about 10 years ago at Gellerasen Raceway.
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Dead reliable and viritually indestructible.
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A year later at Anderstorp Raceway during the last pass of the day it started to rain at the far end of the track. It looked dry but wasn't so I just slid, at a considerble speed, straigt over the edge of the first hard banked curve into an ocean of hydrograins (LECA pellets) which filled up everywhere including the cambelt drive.
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Crank sprocket + cambelt + pellets = No good
IMG_0794sm.jpg (103.75 KiB) Viewed 76 times

Finally the time has come to put the car together which leads to two question.

1. At what angle is inlet and exhaust valve located in the 16v head? My intention is to make a jigg to place the head in but find it difficult to accuately measure the angle. I don't like to wiggle the head around in the press on temprary blocks when depressing the valve springs without being sure the valve face rests absolutely flat on support.

2. How much difference in valve weight is acceptable for a straight replacement? The new exhaust valves are 3 grams heavier(55) and inlet valve 1,5 grams heavier(63). Although the engine is largly unmodified, my redesigned intake ducting allows for a much broader powerband and it gladly revs to 6500. Will I risk running into problems using OE springs?
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Not pretty but very effective
IMG_6966 (Large).JPG (121.63 KiB) Viewed 76 times
GC #164

Guy Croft
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Re: Fiat Coupe 16 VT trackday-cruiser

Post by Guy Croft » Wed Jun 13, 2018 10:32 am

I think the valve angles are 23.5 deg inlet and 22.0 deg ex

The change in valve weight is insignificant although I would recommend the use of GC valve springs.

G
Guy Croft, owner

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