4 banger, Backfires |
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4 banger, Backfires |
Razorbobsr |
Mar 8 2011, 04:05 PM
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#1
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Member Group: Members Posts: 282 Joined: 6-June 10 From: Terre Haute Ind Member No.: 11,813 Region Association: Upper MidWest |
Gents, now that I have 4 banging away!!!!!!!!!!!!!!!!! WOOPPEEEE For the first time in a great while, I now would like to know why my 914 still backfires?? Not as bad as before with 3 and only sometimes 4[hit and missing] For those that have kept up to date, seems that along with snott buildup[lack of use] I had a new plug that was hitting only sometimes, who would have thought............ a new plug!
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URY914 |
Mar 8 2011, 05:07 PM
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#2
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I built the lightest 914 in the history of mankind. Group: Members Posts: 121,038 Joined: 3-February 03 From: Jacksonville, FL Member No.: 222 Region Association: None |
Is it b/f thru the carbs or out the ex. pipe?
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VaccaRabite |
Mar 8 2011, 06:00 PM
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#3
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En Garde! Group: Admin Posts: 13,465 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
Make sure you are timed correctly, valves are correct, etc.
Are your plugs fouled black? Give us some more detail. Zach |
Razorbobsr |
Mar 9 2011, 07:14 AM
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#4
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Member Group: Members Posts: 282 Joined: 6-June 10 From: Terre Haute Ind Member No.: 11,813 Region Association: Upper MidWest |
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Razorbobsr |
Mar 9 2011, 07:25 AM
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#5
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Member Group: Members Posts: 282 Joined: 6-June 10 From: Terre Haute Ind Member No.: 11,813 Region Association: Upper MidWest |
Make sure you are timed correctly, valves are correct, etc. Are your plugs fouled black? Give us some more detail. Plugs are new, engine starts easy when hot/can bump start with starter, OLD plugs looked good but I had tried a couple of sets while trying to clear carb issue, then found 1 new plug that fired intermittely........... Changed that one again, smooth now. My British cars poom out the exhaust on decell, but its far more muted[cooler] the 914 is louder, but not so bad that cops draw there guns. Any thoughts on the Weber/bellcrank/linkage question?? Bob Zach |
URY914 |
Mar 9 2011, 07:39 AM
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#6
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I built the lightest 914 in the history of mankind. Group: Members Posts: 121,038 Joined: 3-February 03 From: Jacksonville, FL Member No.: 222 Region Association: None |
You have an exhaust leak or an intake leak. Heater boxes are not tight to the heads or the intake manifolds are not tight to the heads. Replace the gaskets to start with.
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VaccaRabite |
Mar 9 2011, 07:50 AM
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#7
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En Garde! Group: Admin Posts: 13,465 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
(IMG:style_emoticons/default/agree.gif)
Loud bangs are a leak. Take the car to an exhaust shop with a smoke machine. They will hook the smoker up to the exhaust pipe and the smoke will flow out of where ever the leaks are. Fix the leaks, fix the BOOM. Zach |
URY914 |
Mar 9 2011, 09:13 AM
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#8
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I built the lightest 914 in the history of mankind. Group: Members Posts: 121,038 Joined: 3-February 03 From: Jacksonville, FL Member No.: 222 Region Association: None |
Smoke machine??? The 914 is a smoke machine! (IMG:style_emoticons/default/biggrin.gif)
Put it on ramps or jack stands and let it idle. Crawl under and look for smoke. |
Razorbobsr |
Mar 9 2011, 12:16 PM
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#9
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Member Group: Members Posts: 282 Joined: 6-June 10 From: Terre Haute Ind Member No.: 11,813 Region Association: Upper MidWest |
(IMG:style_emoticons/default/agree.gif) Loud bangs are a leak. Take the car to an exhaust shop with a smoke machine. They will hook the smoker up to the exhaust pipe and the smoke will flow out of where ever the leaks are. Fix the leaks, fix the BOOM. okkkkkkkkkkk Can do. Zach |
Jesse |
Mar 21 2011, 07:01 PM
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#10
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Jesse Group: Members Posts: 149 Joined: 15-February 10 From: Mobile, AL, USA Member No.: 11,363 Region Association: South East States |
Ok so I'm dealing with the same problem, You aren't blowing smoke up my (IMG:style_emoticons/default/bootyshake.gif)
are you? |
william1764 |
Mar 21 2011, 07:23 PM
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#11
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Member Group: Members Posts: 252 Joined: 11-May 10 From: maryland Member No.: 11,717 Region Association: MidAtlantic Region |
had same problem and took the above advice. smoke machine identified leak ource that i was unable to find on my own (IMG:style_emoticons/default/piratenanner.gif)
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Razorbobsr |
Mar 22 2011, 01:57 PM
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#12
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Member Group: Members Posts: 282 Joined: 6-June 10 From: Terre Haute Ind Member No.: 11,813 Region Association: Upper MidWest |
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Razorbobsr |
Mar 22 2011, 01:58 PM
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#13
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Member Group: Members Posts: 282 Joined: 6-June 10 From: Terre Haute Ind Member No.: 11,813 Region Association: Upper MidWest |
had same problem and took the above advice. smoke machine identified leak ource that i was unable to find on my own (IMG:style_emoticons/default/piratenanner.gif) Bong pipe? LOL |
Razorbobsr |
Mar 22 2011, 01:58 PM
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#14
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Member Group: Members Posts: 282 Joined: 6-June 10 From: Terre Haute Ind Member No.: 11,813 Region Association: Upper MidWest |
had same problem and took the above advice. smoke machine identified leak ource that i was unable to find on my own (IMG:style_emoticons/default/piratenanner.gif) Bong pipe? |
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