 Engine Clatter, New rebuild and Cam |
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| 2-OH! |
 Jun 11 2007, 01:59 PM
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Senior Member  Group: Members Posts: 552 Joined: 17-October 03 From: Santa Clarita, Kalifornication Member No.: 1,253  |
When we rebuilt the 73 1.7, I wanted to re-use the D-Jet so we put just the next step up from stock, Web Cam and lifters in the motor...
I have advanced the timing just a little to get rid of the clatter but it's still there if I really get on it... Should I continue to advance the timing or should I retard it ??? Already using 92 octane... 2-OH! |
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| Cap'n Krusty |
Jun 11 2007, 02:32 PM
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
Web Cam's "next step up from stock" does NOT work satisfactorily in the "real world", despite what the salesman is telling you. Recalibrating the MPS provides a small improvement in drivability, but you still have large HC numbers at the tailpipe. HCs are unburned fuel. No amount of fiddling is going to get rid of the "tip in" performance problem off idle. The ONLY aftermarket "performance" cam about which I've heard good things in actual use with Bosch EFI is Jake Raby's cam, but I have no personal experience with it.
As for your noise, advancing the timing is going to promote detonation, as well as causing a heat problem that's invariably fatal to air cooled engines. You ned to properly adjust the valves, set the point dwell and timing to specs, and see what happens. Other sources of clatter are sloppy piston fit, improper backlash in the cam gear, the gear coming loose on the cam, the bolts hitting the oil pump, rods with too much side play, loose wrist pin bushings, and a host of other things. The Cap'n |
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Posts in this topic
2-OH! Engine Clatter Jun 11 2007, 01:59 PM
Blood red 914-6gt Are you sure all of your valves are adjusted? Just... Jun 11 2007, 02:03 PM 2-OH! Yea, think so...We adjusted them at about 700 mile... Jun 11 2007, 02:22 PM Jake Raby Did you correctly complete valve train geometry, o... Jun 11 2007, 02:34 PM Jake Raby I lost power before I finished my post!! h... Jun 11 2007, 02:41 PM 2-OH! Cap'n:
I agree with all the above...I'm w... Jun 11 2007, 02:45 PM Aaron Cox show us your pushrods rick.
if they are stock....... Jun 11 2007, 09:47 PM Jake Raby Sounds like another case of incorrectly set geomet... Jun 12 2007, 10:32 AM
Joe Ricard It clatters under load. when I advance the timing... Jun 12 2007, 10:56 AM |
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