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 Post subject: Re: Test Start
PostPosted: Mon May 21, 2018 4:15 pm 
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Tag: I wish I knew as much as I think I know.
Backfiring through the carbs is usually mixture too lean caused by an air leak or worn carbs or mixture screws too far in or idle jets too small. That is a just the possible carb issues.

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 Post subject: Re: Test Start
PostPosted: Wed May 23, 2018 7:32 am 
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David Jones wrote:
Backfiring through the carbs is usually mixture too lean caused by an air leak or worn carbs or mixture screws too far in or idle jets too small. That is a just the possible carb issues.


Thanks David, I do get an occasional backfire up through the carb.. I will check for leaks and such..
But what I see more is when I run the RPM's up and drop it, it will backfire through the exhaust.. Found out my timing light is not working so the timing could be off a bit.

Bill

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61' 356 B T5
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81 VW Westfalia with 2015 Forester Engine
BMW R50/2, 2BMW R90/6's, BMW R65, K1200RS


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 Post subject: Re: Test Start
PostPosted: Wed May 23, 2018 7:37 am 
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That is usually due to exhaust leaks.

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 Post subject: Re: Test Start
PostPosted: Wed May 23, 2018 8:18 am 
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Bill Lawless wrote:
Actually I just need a Solex fine tuning guide, never had Solex before.

This may get you started: https://porsche356registry.org/article/47

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 Post subject: Re: Test Start
PostPosted: Wed May 23, 2018 8:52 am 
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Float level should be towards lower level of gauge due to panther piss sold today. Back firing or spitting back through carbs? My late friend Bill had a fresh rebuild of S90 that kept spitting back through carbs and poor idle he could never get right. Solved by distributor rebuild.

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 Post subject: Re: Test Start
PostPosted: Wed May 23, 2018 1:22 pm 
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I think I got it, Doug's suggestion of lowing the Float level helped a lot. And I wacked my timing light with the back of my hand and it started working..
Idles smooth, revs right up, timing is advancing.... And no more backfiring. Yeah!!!

Lesson Learned!!! If you buy a used engine and they say it's know to be running see it run first..

Now back to restoring the car it's going in, Then re-build the original engine.. No lack of fun here..

Thanks for all the words of wisdom...

Bill

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61' 356 B T5
65' 356 C T6
82' SC Targa
81 VW Westfalia with 2015 Forester Engine
BMW R50/2, 2BMW R90/6's, BMW R65, K1200RS


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 Post subject: Re: Test Start
PostPosted: Wed May 23, 2018 1:48 pm 
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All right all right all right. https://www.youtube.com/watch?v=FKO9CCfc3Tw

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