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TimZ

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TimZ last won the day on December 29 2017

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About TimZ

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  • Birthday 10/26/1961

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    Dearborn, MI

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  1. TimZ

    Ceramic Coating

    Yes I have ended up pulling the head periodically and have _never_ seen an issue with the coatings. I think 0.5-1mm thick coatings would be a whole different issue (and not a good idea for this application), and none of the mainstream coating suppliers do that to my knowledge. Not sure on the higher temperatures comment -when I was running the Elgin cam and prior to switching to E85 I was seeing EGTs in excess of 1850 degF - still no issues with the coatings, but I did end up dropping an exhaust valve seat. Even this did not cause flaking on the coatings, but they had to be re-done after the resulting head work. I did follow up with Ferrea "super alloy" valves rated for higher temps and more extensive coatings, as shown in the pics.
  2. TimZ

    Ceramic Coating

    I've been using ceramic coatings for years now with no such issues. Even if there had been, I'm kinda curious how people think that some "flaked off" bits of ceramic coatings would destroy anything. I used Dart coatings on the combustion chambers, pistons, valves and intake and exhaust ports...
  3. TimZ

    Matching cam & crank timing

    Yes, you're on the right track. Once you have this orientation between block and head the chain has to have a specific number of links between the marked tooth (marked with a dot) on the crank sprocket and the similarly marked tooth on the cam sprocket. This is what the two bright links on the chain are there for. Side note: This method only gets you "close enough" to run reasonably well. It doesn't guarantee exact cam timing. To do that, refer to this thread. It's a bit more involved process and requires a dial indicator and a degree wheel, but if you've got the engine out already this a great time to learn the proper way to install and time a cam.
  4. TimZ

    Oil in cylinder, retorque HG?

    Yes if it will reach
  5. TimZ

    Oil in cylinder, retorque HG?

    Have you retorqued the head since the rebuild? I always retorque the head on a new head gasket after a few heat cycles. It is certainly possible for the gasket to "settle" a bit and lose some clamping force. I would do this now if you've got access to proper tools - it's certainly not going to hurt anything. Do the retorque with the engine stone cold (let it sit overnight), use the proper tightening sequence and a proper torque wrench, and back each bolt off 1/8 turn or so before torquing. Just back each bolt off right before its turn to be tightened - don't back them all off at once. Sorry if you already knew all this, but a surprising number of people don't...
  6. I would suggest following the FSM instructions for cleaning, repacking and reseating the front bearings. God only knows how long it's been since that's been done, if ever. It _was_ supposed to be a regular service item, as I recall.
  7. Yeah, in general the higher the gear multiplication, the higher the loss from friction. Also 4th is direct drive in this trans, so it's preferred over 5th (no gears meshing at all in 4th). So 18% loss is probably about right for a 3rd gear pull.
  8. The OP's rear wheel number is about 18% below the stock flywheel number. The OP didn't specify what trans he had nor what gear he used for the pull, or at least I didn't see where he did. For an "actually stock" manual it''s a _little_ low, like maybe 5hp. For an automatic it's about right.
  9. FWIW I've been running an LM-1 for years now with zero issues. Also, if it's truly a stock setup, they only rated it for 180hp at the flywheel to begin with. You're maybe a little low, depending on what trans you have, but that's right in the ballpark of what you should expect.
  10. TimZ

    Potter Cam markings

    FYI - Steve regularly posts in the "Church of L Series" group
  11. With 40+ year-old wiring you really can't separate the two. LEDs give off more light with less current, less current means less voltage drop to the LED, so brighter still. Agree with previous posts that adding load resistors is defeating the purpose, and the worst possible way to implement this.
  12. I used this company when I had my 300ZXTT CVs re-done, and was happy with them... http://www.axlesunlimitedinc.com/index.htm
  13. A recurring problem with exhaust manifolds for this head is that as they heat up they grow longitudinally. Since they're held captive on the head, this eventually results in warpage and/or cracked primaries. As HuD 91gt pointed out, this is why the Euro manifolds have them (expected extended high speeds on the Autobahn). For the manifold in this thread, a slip/expansion joint on each of the two runners running longitudinally after the 3-1 collectors and before the wastegate/turbo would help alleviate that. I post about this pretty much every time one of these designs comes up and nobody ever listens 😜
  14. *Cough* Expansion joints *Cough*
  15. TimZ

    L28et powerband issue

    Wait - what? Am I reading correctly that you have a crank pulley with no keyway? Where are you getting your ignition timing from?
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