Twiz

Having found my cam was damaged and needs a regrind I now need new rockers. Can get them from Japan at $40.00 ea plus shipping !!! Anyone have any better/cheaper/closer sources ??

we found it !!! ( well actually my son found it) 1 lobe on the cam had a "dent" in it, not sure what caused it, probably a legacy of the dropped valve on Targa. Will have to check the oil distribution tube to make sure the hole opposite that lobe isnt blocked and also that the cam was properly hardened. Any way the dent was causing a second clearance greater than the measured gap when that lobe was fully closed, hense the tap !!! Amazing, after owning and racing Z's since they came out I never had or heard of that problem before. Thanks for all the responses guys !! If your interested you can see the car on www.rmtcontracting.com/rsport

I had assumed it was because there was no back pressure acting against the various moving parts, the engine was spinning free. the head is fine, nothing wrong with the plug threads

tap happens from first cold start up and increases with revs, but no change in sound or pitch. engine had full rebuild so no piston slap. and all bearings were replaced. No change when clutch is depressed (just me thats depressed !!) Used a stethascope all over and cant pin point the location. car has electric pump and the mechanical one is all blanked off. Will check on the exhaust but I dont think its that. the tap is too metalic to be a leak I think. I think its in the top end but cant think what it can be. Keep trying guys, I need to do an event in it in a couple of weeks. !!

hi, Got a rally prepped 240Z which had a full engine rebuild a few months ago. Ever since getting it back its had a tap, just like a loose tappit or rocker. We have tried everything to try and track this down. 1. tightened all the rocker clearances down to 0 and briefly ran the engine, tap the same. 2. took front cover off and checked chain tensioner etc. 3. took pan off and checked big ends and mains etc. 4. ran engine with 1 spark plug out, one by one, cant detect tap from that. 5. When spinning engine with all spark plugs out there is no tap. 6. 'scoped through the plug holes to check all the valves are ok and not touching a piston. 7. the only thing we havent done is take out the pistons to check the wrist pin bearings but from the bottom with the big ends removed there is no discernable play. One other thing, we have done 2 hill climbs and a rally cross including reving the engine over 7000 regularly with no change to the tap intensity at all. Any one got any ideas ???? Twiz

Hi All, Im a Z guy from way back. Had 3 road Z's and 4 rally versions ranging from mild to an ex factory Safari car back in the UK. Moved to Canada and built a Z to do the Panama Alaska Marathon Rally (came 6th O/A) sold it and then bought it back to do Targa Newfoundland 2 years ago. Great fun but blew the engine on the last day when a valve dropped ( never heard of that before in all the years Ive raced them !!). Rebuilt the car again and did the Knox mountain hill climb last year. I now have a problem I cant figure out so will post a question on that forum. You can see my current Z and my other competition cars on www.rmtcontracting.com/rsport. cheers Twiz