 Valve adjustment newbie question |
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| Stltri |
 Apr 16 2020, 12:22 PM
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#1
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Member  Group: Members Posts: 70 Joined: 13-April 15 From: SoCal Member No.: 18,622 Region Association: None  |
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?
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| GregAmy |
Apr 16 2020, 03:05 PM
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#2
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Advanced Member Group: Members Posts: 2,308 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States 
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| brant |
Apr 16 2020, 03:11 PM
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#3
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914 Wizard Group: Members Posts: 11,626 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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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 |
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| Stltri |
Apr 17 2020, 12:07 AM
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#4
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Member Group: Members Posts: 70 Joined: 13-April 15 From: SoCal Member No.: 18,622 Region Association: None |
QUOTE(brant @ Apr 16 2020, 02:11 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 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? |
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| brant |
Apr 17 2020, 05:42 AM
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#5
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914 Wizard Group: Members Posts: 11,626 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains
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QUOTE(Stltri @ Apr 17 2020, 12:07 AM) QUOTE(brant @ Apr 16 2020, 02:11 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 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 |
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| GregAmy |
Apr 17 2020, 10:51 AM
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#6
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Advanced Member Group: Members Posts: 2,308 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States
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<never mind>
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