engine knock

I recently took my 64 chevy to the mechanic for fine tuning, upon getting in it and going down the road, I got on it a little and now I have engine knock upon aceleration. Anyone know how to cure this before I take my truck back and shove it down the mechanics mouth?

What kind of tuning did he do?

sounds like before, you had your timing retarded. your mech. probably advanced the timing a few degrees which will increase power, but also increase the chances of detonation (knock) to occur.

if you like the way the car runs now, use higher octane gas or octane booster, but it's probably not worth it to go through that unless you are really serious about performance.

for me, if i have to run high-octane fuel or octane booster, i'm going be running a powerful high-compression motor to start with. going through all that for a timing adjustment = not worth it. running a 12:1 motor = worth it.

just have your mech. back off the timing a little.

i agree with anger train:grinyes: :grinyes:

The mechanic adjusted the valves and adusted the timing to keep the engine from back firing and missing out.

Then, to me, it sounds like there are other issues with the engine and what the mechanic did could be considered a 'band-aid' at best.

(assuming it hasn't been converted) He could/should have at least put another set of points in it for you.....

The mechanic adjusted the valves and adusted the timing to keep the engine from back firing and missing out.
question #1: was the engine backfiring to start with?

question #2: do you have a solid-lift cam?

if you don't have solid lifters, your valvetrain doesn't need regular adjusting, since they're hydraulic, so i'd eliminate that unless the guy messed with adjusting the hydraulic lifter preload (which in most cases, should not be messed with).

but timing? man if you loosen your distributer and move it either way in fractions of inches, you will see big differences in how your motor runs, some changes will improve performance (generally advanced) while timing adjustments that eliminate detonation usually decrease performance.

you can do the timing yourself, just get a timing light and learn how to use it. it's not that hard to do. and, you should learn how to do your points and how to set dwell as well. that's all basic tuning stuff anyone can do, and you'll save some money while you're at it. incorrect point dwell will cause backfiring, and setting it correctly takes a couple of minutes at most to adjust.

life's always a balance, motors/cams/carbs/timing adjustments/etc. are no different.

I recently took my 64 chevy to the mechanic for fine tuning, upon getting in it and going down the road, I got on it a little and now I have engine knock upon aceleration. Anyone know how to cure this before I take my truck back and shove it down the mechanics mouth?

this is a common problem with engines this old running on 2008 fuels...i'm sure the repair shop will be able to adjust the timing/mixture to stop the detonation.....this is not serious to get hot about ....

If it's still the original 10.5:1 compression from '64, no amount of tuning or adjustment will completely eliminate detonation. The ONLY things that can "fix" it are reducing the compression or increasing the octane. Retarding ignition timing will take the noise away, but not the problem. It will sap the power, to boot. Try adding 30% "race" gas (100 or higher octane) to 70% 93 and see if the noise goes away. You'll be amazed how much power is lost from retarding the timing...

Jim