Anyone ever bothered to measure the clearance between piston and
valves when the piston is at TDC and the valves are at full lift ??
Just wondering how much extra valve lift it takes to change the 16V
smallport from non-interference to an interference engine.
Cheers... jondee86
Smallport Piston to Valve Clearance...
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Smallport Piston to Valve Clearance...
by jondee86 » Sun Jan 23, 2011 10:40 am
1984 AE86 Corolla GT Liftback, NZ new... now with GZE
spec small port, twinscrew s/c and water/methanol injection
Watch this space >>> <<<
spec small port, twinscrew s/c and water/methanol injection
Watch this space >>> <<<
-
jondee86 - Toyspeed Member
- Posts: 903
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- Location: Wellington
by Flannelman » Sun Jan 23, 2011 4:17 pm
20v when i checked it was around 9mm.
Less valve lift leaves around 1mm clearance at full lift. Not 16v but its something.
If you are going for bigger cams dont go closer than .080inch (2.032mm) clearance on intake and .120inch (3.048mm) on the exhaust.
Less valve lift leaves around 1mm clearance at full lift. Not 16v but its something.
If you are going for bigger cams dont go closer than .080inch (2.032mm) clearance on intake and .120inch (3.048mm) on the exhaust.
- Flannelman
- formerly known as Affroman
- Posts: 461
- Joined: Mon Jul 19, 2004 9:43 pm
- Location: Old Plymouth
by jondee86 » Sun Jan 23, 2011 5:27 pm
Yeah... was fiddling around yesterday, and noticed that If I had the
engine at TDC, and rotated the camshaft, there was some contact.
So it seems that adding 2mm of lift has made it interference ? I'll
check that tomorrow to be sure.
Not that it is a biggie. Full cam lift and piston at TDC does not happen
during normal operation. Only if you lose a cam belt and get unlucky.
Cheers... jondee86
engine at TDC, and rotated the camshaft, there was some contact.
So it seems that adding 2mm of lift has made it interference ? I'll
check that tomorrow to be sure.
Not that it is a biggie. Full cam lift and piston at TDC does not happen
during normal operation. Only if you lose a cam belt and get unlucky.
Cheers... jondee86
1984 AE86 Corolla GT Liftback, NZ new... now with GZE
spec small port, twinscrew s/c and water/methanol injection
Watch this space >>> <<<
spec small port, twinscrew s/c and water/methanol injection
Watch this space >>> <<<
-
jondee86 - Toyspeed Member
- Posts: 903
- Joined: Mon Aug 18, 2003 11:08 pm
- Location: Wellington
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