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914World.com _ 914World Garage _ Valve adjustment newbie question
Posted by: Stltri Apr 16 2020, 12:22 PM
Sorry for the newbie question but what determines the valve gap (.006 vs .008 etc) when doing the maintenance adjustments. Most of the discussions seems to be applicable to stock 1.7/1.8 vs 2.0 engines? What about new builds (2056, 2200, 2270 etc)? How about ported heads?
Posted by: GregAmy Apr 16 2020, 03:05 PM
A classic. Never disappoints:
http://www.914world.com/bbs2/index.php?showtopic=28758
Posted by: brant Apr 16 2020, 03:11 PM
I will try to answer
The 2.0 engines used sodium filled exhaust valves that expand more than non sodium valves.
The gap is determined by the expansion rate of multiple different metals
The type of actual valves and actual pushrod materials in your actual motor will determine the valve gap you need to use... that will play friendly with the amount of expansion when the motor is warm
Posted by: Stltri Apr 17 2020, 12:07 AM
I will try to answer
The 2.0 engines used sodium filled exhaust valves that expand more than non sodium valves.
The gap is determined by the expansion rate of multiple different metals
The type of actual valves and actual pushrod materials in your actual motor will determine the valve gap you need to use... that will play friendly with the amount of expansion when the motor is warm
Is is safe to assume then that in the absence of any info on the materials of the pushrods/valves on the newly built engine that we use .006 gap for intake and .008 gap for the exhaust?
Posted by: brant Apr 17 2020, 05:42 AM
I will try to answer
The 2.0 engines used sodium filled exhaust valves that expand more than non sodium valves.
The gap is determined by the expansion rate of multiple different metals
The type of actual valves and actual pushrod materials in your actual motor will determine the valve gap you need to use... that will play friendly with the amount of expansion when the motor is warm
Is is safe to assume then that in the absence of any info on the materials of the pushrods/valves on the newly built engine that we use .006 gap for intake and .008 gap for the exhaust?
Yes
Safe to assume
Did your rebuild use chromoly push rods or large mm stainless steel valves?
Is it’s a 3 bolt head (2.0). I would assume 6 and 8
Posted by: GregAmy Apr 17 2020, 10:51 AM
<never mind>
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