Also look for a leak in the exhaust system. Check the Header Gasket first.
A leak can draw fresh air in, due to the temporary high vacuum in the
exhaust system; that then causes secondary ignition in the exhaust pipe.
Walt Peterson
Santa Barbara CA
67e R20 w/44's
5-spd, LSD & Big Brakes.
-----Original Message-----
From: datsun-roadsters-bounces@autox.team.net
[mailto:datsun-roadsters-bounces@autox.team.net] On Behalf Of Gary Boone
Sent: Friday, July 01, 2011 6:57 AM
To: Tim; datsun-roadsters: autox.team.net
Subject: Re: [Roadsters] highspeed backfire
If the backfire is out the exhaust, this is a symptom of running too rich
during overrun (after lifting off the throttle). If backfiring through the
carbs, it's too lean.
________________________________
From: Tim
<tputland@charter.net>
To: datsun-roadsters: autox.team.net
<datsun-roadsters@autox.team.net>
Sent: Fri, July 1, 2011 5:59:15 AM
Subject:
[Roadsters] highspeed backfire
Several weeks ago my 70 1600 (w GB/ dizzy) started to backfire, once very
very loud, at highspeed, when I take my foot off the gas pedal. A buddy's 70
1600 (reg dizzy) does the same thing just not as loud as mine does.
What could be causing this?
Thanks
Tim
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