theremm Posted January 1, 2019 Posted January 1, 2019 (edited) I'm having issues with pinging/knocking, in what appears to only be from cylinder #1.When I remove the ignition lead to spark plug #1 the pinging subsides. I've tried removing the #1 spark plug and holding it against the block while cranking to confirm the plug is firing. That all worked ok. (As per previous recent posts) I have just installed a newly reco'd E88 cylinder head setup by MIA engines. The E88 is the MR30 EFI type (injector notches have been filled), running a clive cam 355 grind. I have installed this on my L24 bottom head with the factory 240z flat top pistons (no valve reliefs). I have a fresh tank of 98 octane fuel, and the camshaft has been degreed in correctly. Valve lash has been set and rockers all sound fine when running. As far as testing, so far I have: - adjusted ignition timing, including completely retarding and advancing timing to test; knocking still occurs - adjusted SU mixture, including completely richening the mixture; knocking still occurs - new spark plugs installed and gaps checked - have tried a spare set of ignition leads and the knocking still occurs. Neither set is new however the leads worked fine before swapping the cylinder head. Have attached a video of the engine running. Any thoughts on what else to try? Edited January 3, 2019 by theremm Quote
Enzo Posted January 1, 2019 Posted January 1, 2019 Hi, sounds like an exhaust leak. try tightening up the manifold bolts. David. Quote
Roady Posted January 1, 2019 Posted January 1, 2019 https://www.viczcar.com/forum/topic/14197-engine-noise/?tab=comments#comment-169348 id say exhaust manifold as well. I had the same issue Quote
theremm Posted January 3, 2019 Author Posted January 3, 2019 Thanks both for the responses. Turns out it was an exhaust manifold leak, so an easy fix after all. When I went to tighten up the manifold I noticed that the threads on two of the exhaust studs had partially stripped and therefore was causing the nuts to turn tightly but not actually move any further down the thread. Removed these studs and replaced them with 2 exhaust bolts I had on a spare motor. This did the trick. Quote
Enzo Posted January 3, 2019 Posted January 3, 2019 Glad it was an easy fix. Now get out and enjoy it. theremm 1 Quote
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