X-180, "O"- ringed Cam Carriers ? - LotusTalk - The Lotus Cars Community
 
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post #1 of 5 (permalink) Old 06-10-2016, 11:23 AM Thread Starter
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X-180, "O"- ringed Cam Carriers ?

Here is a very elegant solution to the cam towers oil leaks and assembly thickness variation.

Here is an older email forwarded by my friend Zig:

Ray,

If you want to go to the extra step of having the cam tower "O-ringed" you can contact Steve at Salinas Valley Precision (831) 422-2484.
Steve wants $300.00 for a set of 2 cam towers.

I had him do up a jig and program for mine when i did a rebuild.
Another consideration on sealing is a little sealant under the cam tower
bolt heads to help keep oil from creeping under and down to the sealing
surface.

Best,
Jeff



The only problem is that Salinas Valley Precision has closed down or Steve retired, or... who knows what happened.

ANYONE,
if you have any lintel/leads on this subject, please chime in!

Last edited by MRDANGERUS; 06-10-2016 at 04:10 PM.
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post #2 of 5 (permalink) Old 06-11-2016, 09:00 PM
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Yes- Unfortunately Steve not in the machining business any longer. Go with Loctite 574....

Jeff
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post #3 of 5 (permalink) Old 06-12-2016, 06:34 AM Thread Starter
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Originally Posted by speedmerchant View Post
Yes- Unfortunately Steve not in the machining business any longer. Go with Loctite 574....

Jeff
What happened to the CNC program?
I'd like to buy it.
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post #4 of 5 (permalink) Old 06-08-2019, 12:14 PM Thread Starter
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Anyone who has any information about this improvement, please chime in.
My machinist has acquired 2 CNC machines and he can duplicate this at ease, but I'm curious if there are any disadvantages.
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Last edited by MRDANGERUS; 06-17-2019 at 08:11 AM.
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post #5 of 5 (permalink) Old 06-15-2019, 09:11 AM
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If you dry-shim to the top of the clearance ranges (0.007" Intake / 0.012" Exhaust), then do the final assembly with the O-ring in place, will the final clearance be affected by the presence of the O-ring? If so, by how much?

Anaerobic sealants typically have a 0.0005" (half a thousandth) film thickness. So dry-shim that much short of the top of the clearance spec (0.0065" Intake / 0.0115" Exhaust). Then when the sealant is added during final assembly, the end result should be clearances right at the top of the range.

For the old school Permatex Aviation Form-a-Gasket, the film thickness is 0.0015" (one and a half thousandths), so driy shim to 0.0055" Intake / 0.0105" Exhaust.

In horizontally opposed aircraft engines, the cylinder blocks are usually made up of left & right halves bolted together along the centerline of the crank main bearing bore. When they're bolted together with sealant, it's not uncommon to also lay a single strand silk thread around the joint. Similar to this O-ring layout, but just a thread laid in the sealant 'painted' onto the joint flange. But the thread affects how intimately the block halves make contact, and therefore affects the bearing clearances... so allowance is made when align boring the block.

So, is it necesssry to make any allowance for the O-ring material when shimming the valves? If so, how much?

Regards,
Tim Engel
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