Quote:
.20D of the valve
Does that mean 20% of the diameter of the valve?? If so all Slant 6 valves are probably shrouded
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| Mark Four turbo build thread https://slantsix.org/forum/viewtopic.php?t=64567 |
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| Author: | DadTruck [ Tue Apr 07, 2020 9:44 pm ] |
| Post subject: | Re: Mark Four turbo build thread |
Vizard says a valve is geometrically de shrouded when the clearance between the valve and the wall is .20D of the valve at .250 lift. The illustration in DV’s book shows a combustion chamber wall that angles away from the valve head as the valve is opened. Hence the comment on the .250 lift. |
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| Author: | Rick Covalt [ Wed Apr 08, 2020 1:58 pm ] |
| Post subject: | Re: Mark Four turbo build thread |
Quote: .20D of the valve Does that mean 20% of the diameter of the valve?? If so all Slant 6 valves are probably shrouded
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| Author: | DadTruck [ Wed Apr 08, 2020 7:19 pm ] |
| Post subject: | Re: Mark Four turbo build thread |
Yes and Yes |
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| Author: | MadScientistMatt [ Fri Oct 02, 2020 11:17 am ] |
| Post subject: | Re: Mark Four turbo build thread |
Finally back on this one. The cylinder head has been ported and gasket matched, as has the intake. The exhaust manifold did not need any gasket matching. Attachment:
File comment: Cylinder head porting
Then I dropped the head off at the machine shop for a valve job and cutting the valve guides down for more clearance and positive type valve stem seals. Still waiting on that.bowl work complete.jpg [ 108.64 KiB | Viewed 4605 times ] But then it turns out some of the items I've ordered aren't quite right. The freeze plug set didn't include the cam plug. Is there supposed to be some sort of thrust bearing on it? And the bearings listed under part number BC321J - Rockauto lists these as correct for a slant six as of today - definitely aren't right. Attachment:
File comment: Wrong bearings.
Then I realized I had five sets of bearings instead of four... looks like they sold me a set of small block V8 bearings.
bearings dont fit 1.jpg [ 222.75 KiB | Viewed 4605 times ] |
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| Author: | DadTruck [ Fri Oct 02, 2020 6:36 pm ] |
| Post subject: | Re: Mark Four turbo build thread |
No cam thrust plate/washer on a slant,,, Lot of folks do the rocker adjusting screw welded into the timing chain cover routine. |
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| Author: | MadScientistMatt [ Mon Oct 05, 2020 8:06 am ] |
| Post subject: | Re: Mark Four turbo build thread |
Quote: No cam thrust plate/washer on a slant,,,
Thanks, I'll do something like that - particularly since I'm going to be using the Rollmaster double roller timing chain.
Lot of folks do the rocker adjusting screw welded into the timing chain cover routine. |
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