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Car Forum / Antique and Collectibles / Studebaker / August 2005

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backfireing while slowing

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TomNoller - 04 Aug 2005 14:12 GMT
Is that an indicator of timing being off a little?
Bigbob62 - 04 Aug 2005 14:38 GMT
Is it actually backfiring through the carb or just popping and burning
off raw fuel going through the exhaust?

I LOVE the sound of that bop-bop-bop-bop as I decelerate, even though
it's an indication that the mixture may be too rich or that the timing
is advanced just a little too far.

Bob

> Is that an indicator of timing being off a little?
TomNoller - 04 Aug 2005 14:54 GMT
Bob, it's an exhaust sound.  Flathead 185.  Okay, if I back off the
advance, which way do I move the mark?  (DUH, I know...<G>)
Bigbob62 - 04 Aug 2005 17:02 GMT
Hmm...not sure about that since my only experience with a flattie Stude
185 is getting the one in my old 55 Sedan eunning a couple years ago.
I'm accustomed to the Chebby engines...and for them I remember to move
the advance toward the passenger side (advancing on the girl in the
seat) or toward the driver side to retard (for obvious reasons!).

Since Studes run backwards...(at least the distributor turns
bass-ackwards) I'd have to assume it's the other directions
entirely...but I could be wrong!

Best bet is to get out the old timing light and check it properly. I
like running about 2-4 more degrees initial advance than the books call
for. That's mostly because the old mechanical advances seldom pull in
all the reminder of the advance they need to run under load...but also
because I LIKE that bop-bop-bop-bop sound!!
Alex Magdaleno - 04 Aug 2005 15:55 GMT
It also can be a sign of too lean. Years ago I had a Chevy 6 with a wolf
whistle on it. It would backfire when I decellerated with the wolf whistle
on.

Alex M

> Is it actually backfiring through the carb or just popping and burning
> off raw fuel going through the exhaust?
[quoted text clipped - 6 lines]
>
>> Is that an indicator of timing being off a little?
John Poulos - 04 Aug 2005 16:33 GMT
While try to get the Speedster to start, I apparently pumped the pedal
once too often and flooded it. When it did not start, like a idiot I
pumped some more. Since it would sputter a bit, perhaps some gas down
the carb would do it, pour gas down, sputter, repeat, BANG ! The bacfire
blew the entire end cap and guts out of a new stainless steel muffler.

> It also can be a sign of too lean. Years ago I had a Chevy 6 with a wolf
> whistle on it. It would backfire when I decellerated with the wolf whistle
[quoted text clipped - 12 lines]
>>
>>>Is that an indicator of timing being off a little?

Signature

JP/Maryland
Studebaker On the Net http://stude.com
My Ebay items:http://www.stude.com/EBAY/
64 T cab truck
64 R2 4 speed Challenger (Plain Wrapper)
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54 Starlight

Alex Magdaleno - 05 Aug 2005 05:24 GMT
Hate when that happens!

> While try to get the Speedster to start, I apparently pumped the pedal
> once too often and flooded it. When it did not start, like a idiot I
[quoted text clipped - 18 lines]
>>>
>>>>Is that an indicator of timing being off a little?
N8N - 04 Aug 2005 15:01 GMT
> Is that an indicator of timing being off a little?

hole in exhaust, running rich can also cause this...

nate

(had a VW with Techtonics exhaust that would always do this no matter
what...)
 
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