| [ Total Views: 1169 | Total Replies: 8 | Thread Id: 577 ] |
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 jenz58
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| posted on September 13th, 2002 at 10:49 PM |
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What's doing it?
A recently installed 36hp Type 1 engine is running fine except at times it looses power and gives what I call a cough or two then picks up speed
again. It will run along fine and then do it again out of the blue.
The last couple of days she is actually backfiring occasionally when I lower speed.
The carby with the engine was no good so we put on the one from the other engine with an automatic choke.
Have 3 older manual choke carbies which I've been meaning to get fixed up but haven't yet.
She's running fine otherwise, not using oil, starts first time. Any ideas? |
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 kombi_kid
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| posted on September 14th, 2002 at 08:45 AM |
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check your points gap and also check they arnt burnt out! most probably electrical!
cheers
rhys |
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KruizinKombi
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| posted on September 14th, 2002 at 11:02 PM |
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Backfiring
Jen, I think the later carby is just too big for the 'new' engine, which means that the mixtures will be all wrong.
It is possible to have the larger carby rejetted to get a better fuel/air ratio, but I think you would be better off having one of the old stock sized
(for that motor) carbies reconditioned. Come for a drive one weekend and I'll fit it for you. 
Kruizin Kol
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70AutoStik
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| posted on September 15th, 2002 at 02:29 AM |
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On the right track, backfiring is, surprisingly, usually caused by an over-lean mixture. What's the main jet? (You may have grabbed a carb from
a type 3, which will run much too lean.)
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Golde60
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| posted on September 15th, 2002 at 12:42 PM |
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i m no expert, so please criticize or correct if necessary.
i reckon if when your driving it and at hi revs you step of the gas (while still in gear) and it backfires as it is decelerating then its the mixture
being lean. my 69 does this.
however, your description says that it loses power and backfires, so i assume this is when you are on the accelerator. i also had a problem like this
for a while. in my case, it was cos the leads from my coil were poorly connected, so yes.......
electrical. simple to fix.
then a few weeks later, my condensor broke off its bracket and the engine made a big noise and stopped!
again, electrical.
little more difficult to fix.
anyway, my advise: check all your connections. may fix it
good luck |
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70AutoStik
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| posted on September 15th, 2002 at 07:00 PM |
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That can do it, too, but there is usually something else to cause the actual backfire - overheating or leaky valves (or excessively worn guides.) the
fact that it starts and runs well fits the scenario of a lean carb - when you start the choke provides the extra fuel. But that's still very
valuable input, sometimes we get carried away with the exotic and forget the basic.
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jenz58
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| posted on September 16th, 2002 at 12:03 AM |
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Thanks guys.
I will get those old carbies fixed up or made into one good one.
The backfire is when I decelerate, and is a new phenomena
The cough follows the lose of power when travelling at a constant speed/ no acceleration change.
Bel ran perfectly all of yesterday, in and out of the city and 100 down the freeway. It's just weird :o
Col I think I'll take Bel to Bayswater and get it fixed before next weekend so she runs smooth to Cobram.
OK, another question.
What do you do to keep your beetle more stable on the road when travelling through high winds.
Bel and I almost lost it between Healseville and Yarra Glen today. A really strong gust got us from the side and I had to struggle to keep her on the
road. I've had it happen before but this time it was bad and I did almost run off the road. The wind really knocks her around. |
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KruizinKombi
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| posted on September 16th, 2002 at 07:03 PM |
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Sailing boat
You need to have the front end checked out - tie-rods, steering box, kingpins, etc. then have a wheel alignment done. I think lowering it may also
help, but make sure everything is right first.
Kruizin Kol
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jenz58
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| posted on September 21st, 2002 at 12:07 AM |
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Getting steering box replaced next week, unable to do today.
Her distributer is worn and needs replacing (next week)
There was a blocked jet in the carby.
How embarrassing the backfire was because I lost a tail pipe, must have been when I was on the dirt road :o
Thought she looked odd from the back one day, then yesterday I looked a bit harder. Oops!
Had two tail pies put on because the other one was a bit crappy and needed replacing.
She is running a lot better. I can hear the dak dak sound thing happening |
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KruizinKombi
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| posted on September 21st, 2002 at 10:58 PM |
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Dak Dak
Excellent news Jen. I don't think you'll regret it in the long run. :thumb
Kruizin Kol
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jenz58
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| posted on September 22nd, 2002 at 10:50 PM |
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Did the cruise to Barooga this week-end, it was excellent and Bel didn't miss a beat
Because of the tyres and steering box her handling is still not 100% but she did well.
Fellow cruisers were so excellent with keeping an eye out for Bel and I. Herbie was leading the pack and said he didn't have any trouble seeing
where Bel was (holding the rear) because of her vivid blueness :thumb
It was a great week-end and I got to witness some amazing roadside mechanical work (must remember to keep a bottle of Kero) :o
Cheers
Jen |
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 vanderaj
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| posted on September 23rd, 2002 at 12:19 AM |
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Jen,
I'm sorry - I didn't realise you had a 36 hp. I would have slowed down during my segment as a cruise controlled 80 km/h was probably too
much for the poor thing on the hills and bends.
You did really well to keep up with us!
Anyway, hope to see you next week,
Andrew
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jenz58
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| posted on September 24th, 2002 at 11:28 AM |
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I'll be there on the Portsea cruise and I'm not telling you what I'm ordering from the menu or to drink.
I was telling my kids about your VW and that you probably didn't have it out of first gear
You guys were excellent waiting up for Bel and me. I did fall back on hills and bends but we caught up eventually, or you guys slowed down until I
caught you?
Hoping to find a nice Type 3 Square Back eventually so that I've got a bit of a work horse and something which can move along better on long
runs. Bel can then be my city ride.
Had a couple of crazies get impatient with Bel between Yea and Yarra Glen. One guy sat 1/4 inch from her tail and then nearly wiped out her front when
he cut us off passing:o
Old slow cars seem to incite road rage in some
Catch you next week
Jen
(my spelling is getting worserer)
[Edited on 24-9-2002 by jenz58] |
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