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#11
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#13
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That guy is full of crap. There are millions of users that race and
drive the stock factory Bosch ignition without problems getting excellent performance and mileage. Have you ever heard someone say "It is a solution in search of a problem?" That would be Jacobs. I have driven 300,000 plus miles in 2 Rabbits with the stock Bosch electronic ignition getting 30 mpg every day on the one car. I was getting 32-33 mpg on the other car which had the bigger engine but a .75 top gear. Performance was great with either car. In days of old where the ignition was triggered by points some sort of module like the MSD helped sometimes. I had bought a MSD for my 67 Beetle and I saw no difference at all. Note that MSD is a widely respected and used product. Go to any Nascar pit and you will see MSD in the car. GO to any dragstrip and you will see MSD. Now try to find Jacob's at any of those same events. You will not see it. Not because his product costs a bit. Just because it does not work any better or as good as the MSD which has been out since the 70's. You would be better served to remove the catalytic onverter for an inspect of both ends of it. If it has melted in any way then you need to replace it after you figure out why it has melted. I have had to replace mufflers because chunks of catalytic converters plugged up the muffler. If your vehicle does not have adequate performance then it has cam timing, ignition timing, injector or exhaust problems. You may need a genuine VW expert to help you out. Changing the cam timing one tooth will create a significant change. I can tell every time I miss by one tooth within a 1,000 feet of driving the car. I have missed by one tooth on my Toyota pickup and I could tell before I left the driveway that I had messed up. wrote: >Check. I just the cam mark (on driver's side) to the top edge of the >head while #1 at TDC. I had messed with that a bit in experimentation. >The result seems fairly insignificant. I am now questioning my own >senses. That is, maybe I have gotten accustomed to a mazda pickup that >I had been driving while my truck was dead. I will take my pickup on >the freeway tomarrow to observe its behavior. That is the place that I >know my vw performance. It would usually be ~struggling when on cruise >at 75 MPH in .71 5th gear. I shall see if it will even pick up and >hold 75 MPH now. The idle point seems to change now as well. If I let >it sit and idle, it seems to start to miss a bit and the idle drops. >How do I read this? Oh, and i responce to the ignition quality.. I >have recently read that in opinion of some experts, Bosch ignition >systems are relatively of lower quality than the American counterparts. >The source of this is "The Doctor's step by step guide to optimizing >your ignition" by Christopher Jacobs of the Jacobs company that makes >ignition components. What it all seemed to come down to is the >ignition system's ability to allow greater spark plug gap. Which would >allow a larger ball of flame initially, so the propogation of >combustion would be advanced and more complete. What do you think? > wrote: >> Incorrect camshaft timing will cause a big loss of power while >> presenting a deceptively smooth idle. The 82 should already have all >> the electronic ignition you need. >> >> wrote: >> >> >What can go wrong when changing a timing belt that would result in a >> >big loss of acceleration while still holding the same idle. It also >> >seems to miss just a little when cruising down the street. Please >> >help. Also, do ignition computer systems help older vws? >> > >> wrote: >> >> You will see an increase in power if the cam is one tooth >retarded. >> >> Reset the ignition timing after reseting the cam timing. >> >> >> >> wrote: >> >> >> >> >I thought that I had my timing straightened out on my 82 1.7 CIS >> >rabbit >> >> >pickup with AC. It idles pretty good now. The timing light had >> >> >confirmed that the ignition timing is on the mark. I have the >cam >> >mark >> >> >set to the top edge of the head. Everything looks good. The >> >problem >> >> >is the lack of power. There is a significant loss in power since >I >> >had >> >> >changed the timing belt. I just dont see what is causing this. >Can >> >> >anyone help me? Thanks. And what could I expect from advancing >the >> >> >cam by one notch? >> >> >> >> >> >> Jim B. >> >> >> Jim B. Jim B. |
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#15
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thanks for the replies. The truck was on a jackstand for 2 days. When
doing the belt, I messed up the pulley positions and had to reset the timing. TDC on flywheel and #1 piston is confirmed. The inside cam mark is on the edge of the head. A timing light was used to align the spark to the mark right next to the TDC mark on flywheel. NGK spark plugs were installed that were recommended by a local motor head. He said they are a little hotter than the ones I had before. Im going to have a close look at my vacuum advance soon. What is the retard funtion on it for? One weird symtom that I noticed is that it idles high when cold, 1500 rmp, and low when hot, 700 rmp. What does this mean? And why does it miss consistently? And is there anything to be done that would allow larger spark plug gap? T wrote: > wrote: > > Oh, and i responce to the ignition quality.. I > > have recently read that in opinion of some experts, Bosch ignition > > systems are relatively of lower quality than the American counterparts. > > The source of this is "The Doctor's step by step guide to optimizing > > your ignition" by Christopher Jacobs of the Jacobs company that makes > > ignition components. > > > Of course Jacobs wants to sell you something. > > - How long was the 1.7 Offline during the timing belt swap? A few days > or weeks and months? > > - Besides swapping the belt did you adjust ANYthing else? Loosen the > Dist to adjust idle, etc? Anything at all? Or just belt off/belt on. > > > TBerk |
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