Pinging/Knocking
- Thread starter NewStangOwnr
- Start date
check the mechanical advance mechanism for free operation, it sounds like it isnt working properly.
check your initial timing as it may have slipped.
if these check out, then likely you were in the wrong gear at the wrong speed for accelerating. you probably should have been in third gear and not fifth.
check your initial timing as it may have slipped.
if these check out, then likely you were in the wrong gear at the wrong speed for accelerating. you probably should have been in third gear and not fifth.
65ShelbyClone
Founding Member
Yeah, I think the problem is probably in your distributor. I don't think you need a recurve kit until you find out why yours is not advancing far enough.
You also shouldn't need to use 91 octane with just 9:1 compression. I have around 9.25:1 and mine doesn't ping with 87. I'm using a stock '85 GT distributor with 10° initial, ~38° total, and a low-overlap blower cam(keeps the dynamic compression higher). You should have more like 36° total timing by ~3500rpm, not 22°.
You also shouldn't need to use 91 octane with just 9:1 compression. I have around 9.25:1 and mine doesn't ping with 87. I'm using a stock '85 GT distributor with 10° initial, ~38° total, and a low-overlap blower cam(keeps the dynamic compression higher). You should have more like 36° total timing by ~3500rpm, not 22°.
Alright cool.
Well I tried to start it again today and was kinda scared, it seemed to backfire out the carb. Either way I'm going to check the distributor. I might just bring it to a shop around here and hopefully they can fix it, I just dont have that much time lately.
On the 91, I know, but it feels(felt...
) better on 91 than 89.
Thanks for the suggestions keep them coming
Well I tried to start it again today and was kinda scared, it seemed to backfire out the carb. Either way I'm going to check the distributor. I might just bring it to a shop around here and hopefully they can fix it, I just dont have that much time lately.
On the 91, I know, but it feels(felt...
) better on 91 than 89.Thanks for the suggestions keep them coming
Check the intake valve pushrod for that cylinder, it could be bent too. Intake in-------nothing out-------- equals a bent pushrod when the exhuast tries to escape back out the intake.
woodsnake
15 Year Member
Did I miss the part where the pushrods were measured? For two rockers to break is not usual, at all...
http://store.summitracing.com/partdetail.asp?part=CCA-35-556-8&autoview=sku
1.6 RR
I ordered the pushrods a little short and they sit right about in the middle.
1.6 RR
I ordered the pushrods a little short and they sit right about in the middle.
woodsnake
15 Year Member
Can you be more specific about how you measured, the tools you used, etc...
Didn't I read somewhere that you had a shop build your short block?
I broke a rocker arm almost in half, I thought I punched a hole in the top of my piston it was so loud!
I'm thinking there is more going on here than meets the eye.....
Didn't I read somewhere that you had a shop build your short block?
I broke a rocker arm almost in half, I thought I punched a hole in the top of my piston it was so loud!
I'm thinking there is more going on here than meets the eye.....
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