timing?
timing? i cant get my timing set right on my sbc 350. at 1000rpms its around 8 degrees (chevy specs) and it runs like ****. it runs much better advanced like crazy almost 2 inches away from the timing indicator. mabye 10-20 degrees advanced over chevy spec. does anyone know the probalem? or can tell me if its normal to run that advanced? its has a large hydraulic roller cam and aluminum heads. 10:1-11:1 compression also could 87 octane in the tank from the old 8:1 motor be causing any probalems, i hear no detenation or pinging also one more thing, it seems to be shaking quite a bit at idle, could this be because i dont have solid motor mounts, or a bad flywheel. or is it normal?
Staging Lane
Joined: May 2005
Posts: 68
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What size cam? The 87 octane might be doing a little bit, but it shouldn't hurt it too bad with only 10.1-11.1 compression. Sometimes when you install the distributor, you can get a tooth off, and that will mess you up. I usually set the timing by ear and feel anyways, especially on a built motor. If it runs good where you have it, leave it there, I don't see it hurting anything. As for the shaking, if you have a large cam, then it's going to rattle the car a little, but I don't know how severe the shaking is in your case. Is the motor shaking, or the whole car?
Originally Posted by white_ta
What size cam? The 87 octane might be doing a little bit, but it shouldn't hurt it too bad with only 10.1-11.1 compression. Sometimes when you install the distributor, you can get a tooth off, and that will mess you up. I usually set the timing by ear and feel anyways, especially on a built motor. If it runs good where you have it, leave it there, I don't see it hurting anything. As for the shaking, if you have a large cam, then it's going to rattle the car a little, but I don't know how severe the shaking is in your case. Is the motor shaking, or the whole car?
okay, the cam is 248/254@50, 562/580 duration with 110 lsa
only the engine/trans shake. its noticeable but not like horrible. it just doesnt do that on my freinds motor in his 64 chevelle, he has a 355 with a large solid roller cam and his has no shaking at all. but he has solid motor mounts, and i have reg ones.
Originally Posted by slow trap
with a larger camshaft you'll need more initial timing than factory.i'd try 12-16* and 36 * total by 3-3500 rpms.
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Staging Lane
Joined: May 2005
Posts: 68
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Originally Posted by terr1bleone
okay, the cam is 248/254@50, 562/580 duration with 110 lsa
only the engine/trans shake. its noticeable but not like horrible. it just doesnt do that on my freinds motor in his 64 chevelle, he has a 355 with a large solid roller cam and his has no shaking at all. but he has solid motor mounts, and i have reg ones.
only the engine/trans shake. its noticeable but not like horrible. it just doesnt do that on my freinds motor in his 64 chevelle, he has a 355 with a large solid roller cam and his has no shaking at all. but he has solid motor mounts, and i have reg ones.
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Are you using a stock style balancer? If so they are bad about the outer ring slipping where it is made to the rubber. So your marks would mean nothing. Also if you have found that this has happened do not run the engine anymore until you get another balancer.
TECH Apprentice
Joined: Jun 2004
Posts: 352
Likes: 0
u need to set the timing advanced,im guessing you dont have a locked out distributor so set the timing at 38 degrees@ 2500 RPM and the thing will run,also get the 87 outta the tank,put good gas in,tune the carb right,and itll work...
Originally Posted by Ls1LikeNoOther
u need to set the timing advanced,im guessing you dont have a locked out distributor so set the timing at 38 degrees@ 2500 RPM and the thing will run,also get the 87 outta the tank,put good gas in,tune the carb right,and itll work...
Is it safe to just advance the timing to peak RPM then back it off a little for safety?
the carb definitely isn't set up right for my altitude, but once it's running I can do that.
sometimes 2500 rpm don't have full advance.mine don't until 3500 but i have the stiff springs also.i would try a new balancer and get a timing light that has the **** on the back and set like that.keep us posted.
TECH Apprentice
Joined: Jun 2004
Posts: 352
Likes: 0
That motor with our old setup went 12.1 in a 3600 lb car with 3800 degrees timing at 2500 rpmm..
And you have you make your timing come in at 2500...Hold the engine at 2500 rpm and turn the distributor until u get to 38 degrees,then tune the carb and ur car accordingly..
And you have you make your timing come in at 2500...Hold the engine at 2500 rpm and turn the distributor until u get to 38 degrees,then tune the carb and ur car accordingly..
Originally Posted by Ls1LikeNoOther
That motor with our old setup went 12.1 in a 3600 lb car with 3800 degrees timing at 2500 rpmm..
And you have you make your timing come in at 2500...Hold the engine at 2500 rpm and turn the distributor until u get to 38 degrees,then tune the carb and ur car accordingly..
And you have you make your timing come in at 2500...Hold the engine at 2500 rpm and turn the distributor until u get to 38 degrees,then tune the carb and ur car accordingly..
TECH Apprentice
Joined: Jun 2004
Posts: 352
Likes: 0
I THINK those were cast...They might be Hyper-U's I bought that rotating assembly jus to get by for the time being..
It had etec 200 heads on it, a edelbrock victor intake,quick fuel 750 carb, a 2800 stall converter 3.73 gears 10 bolt completely stock leaf spring suspension in a 70 1/2 camaro weighing in at 3600 lbs cut consistent 1.70 60 fts...
It had etec 200 heads on it, a edelbrock victor intake,quick fuel 750 carb, a 2800 stall converter 3.73 gears 10 bolt completely stock leaf spring suspension in a 70 1/2 camaro weighing in at 3600 lbs cut consistent 1.70 60 fts...
Originally Posted by Ls1LikeNoOther
I THINK those were cast...They might be Hyper-U's I bought that rotating assembly jus to get by for the time being..
It had etec 200 heads on it, a edelbrock victor intake,quick fuel 750 carb, a 2800 stall converter 3.73 gears 10 bolt completely stock leaf spring suspension in a 70 1/2 camaro weighing in at 3600 lbs cut consistent 1.70 60 fts...
It had etec 200 heads on it, a edelbrock victor intake,quick fuel 750 carb, a 2800 stall converter 3.73 gears 10 bolt completely stock leaf spring suspension in a 70 1/2 camaro weighing in at 3600 lbs cut consistent 1.70 60 fts...