Road Test, Slow acceleration and valve chatter |
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Road Test, Slow acceleration and valve chatter |
VA_914 |
Oct 25 2020, 01:12 PM
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#1
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Newbie Group: Members Posts: 4 Joined: 31-March 08 From: Hampton, VA Member No.: 8,873 Region Association: MidAtlantic Region |
I am finally road testing my 2.0 restoration and haven't quite got it right yet. It starts fine, runs smooth idling or revved up in the driveway but on the road test it accelerated slow, with what sounds like valve chatter when I give more gas to accelerate. It wouldn't go over 3000 rpm in 1st, 2nd or third. I tweaked the timing a bit and it seemed to get better, less chatter and almost up to 4000 rpm. Suggestions, comments; am I on the right track?
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Superhawk996 |
Oct 25 2020, 05:53 PM
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#2
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914 Guru Group: Members Posts: 5,852 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
Looks Great.
If possible you may want to check mixture. Wideband O2 would be ideal. Running a 2056 on stock FI has been done by others but there is usually tweaking involved to get it running well. The wild card is what the compression ratio was set at when rebuilt with the 96mm pistons. Have you tried using premium? Does that reduce the ping? 27 degrees timing should be fine. Other stuff would focus on not having uncontrolled vacuum leaks that could be leaning you out. Bottom line, you can do some tuning here an there but don't run it hard for extended periods with it detonating. It really can wreck an engine in short order. Need to find what is causing it and fix. Not running clean up to 5000 rpm is a sign that something is wrong. Any backstory on the injectors? Are you sure they are cleaned and flowing properly? Fuel pump pressure checked and set correctly? |
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