 Low Compression, running rough, backfire, Technical help please |
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| Don911 |
 May 17 2018, 01:59 PM
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Newbie  Group: Members Posts: 17 Joined: 30-March 18 From: Charleston Member No.: 22,007 Region Association: South East States  |
So I have searched the forum (and internet) before posting...sorry if this a tired old topic.
Trying to narrow down the cause for some backfiring through the carbs and rough running. Compression: #1-125, #2-90, #3-70, #4-85 Some oil around the air filter housing. #3 plug fouled so all were replaced. Carbs synched Valve job completed. Still: runs rough in lower RPM ranges especially when starting out and now I'm getting an occasional backfire through the carbs under acceleration. Mech says it caused by low compression and needs at least a top end rebuild. A lot of what I'm reading points toward...well a lot of things, but nobody says low compression causes the chugging from start and the backfire. Agree? Disagree? Not enough info? Thoughts please...thanks! |
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Posts in this topic
Don911 Low Compression, running rough, backfire May 17 2018, 01:59 PM
The Cabinetmaker sounds like your mech might be on the right track.... May 17 2018, 06:25 PM worn Valve job completed meaning valve adjustment or re... May 17 2018, 06:52 PM Vacca Rabite So... When was the last time it had the valves ad... May 17 2018, 07:07 PM mobymutt I also have terrible compression numbers, and I al... May 17 2018, 07:49 PM Don911 Thanks guys! I have accepted the inevitable :... May 18 2018, 07:52 AM
Mblizzard
Thanks guys! I have accepted the inevitable ... May 18 2018, 08:06 AM worn
Thanks guys! I have accepted the inevitable... May 18 2018, 08:08 AM Don911 A leak down has been completed as well. May 18 2018, 08:17 AM Mblizzard
A leak down has been completed as well.
Well it... May 18 2018, 08:26 AM Don911 It is a 1.8 with dual Solex carbs. I'll upgra... May 18 2018, 09:00 AM Mblizzard Are you going to build it? May 18 2018, 11:46 AM The Cabinetmaker You did not answer the questions about valves. Wha... May 18 2018, 12:15 PM Vacca Rabite Don't put big carbs on a 1.8 unless the engine... May 18 2018, 12:25 PM Don911 It was a valve adjustment done by a mechanic.
Po... May 21 2018, 08:34 AM Don911 So thought I'd follow up. I started this thre... Dec 11 2018, 10:55 PM porschetub Great ,but we are funny on here lots of pics and r... Dec 11 2018, 11:16 PM VaccaRabite Yeah, post up your combo and build pics. I'm ... Dec 12 2018, 06:21 AM TheCabinetmaker No pics. Didn't happen! :alfred: :ttiwwp... Dec 12 2018, 08:23 AM dr914@autoatlanta.com you say "valve job" did you mean vale AD... Dec 12 2018, 08:51 AM Ansbacher [quote name='dr914@autoatlanta.com' date=... Dec 12 2018, 10:00 PM Don911 I'll gather what I have tonight if I have time... Dec 12 2018, 09:05 AM tazz9924
So I have searched the forum (and internet) befor... Dec 12 2018, 07:26 PM  |
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