WHAT HAPPENS when you advance the cams all the way?
01-29-2008, 11:05 PM
#17
Inventor
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Too fair, I have no more to sell. 
I've advanced my 86.5's cams to 8° crank without issue. That makes some serious low end grunt, but you can't make as much HP. I have my cams set at 0°, because I'm still trying for max HP, but I'd prefer 3-4° advance with my automatic.
My 81 has 8° advance and it goes like stink. It made 277 rwtq, set at zero, so it makes more now, lower in the rpm range! (Each degree is about a 100rpm shift.)
I've advanced my 86.5's cams to 8° crank without issue. That makes some serious low end grunt, but you can't make as much HP. I have my cams set at 0°, because I'm still trying for max HP, but I'd prefer 3-4° advance with my automatic.
My 81 has 8° advance and it goes like stink. It made 277 rwtq, set at zero, so it makes more now, lower in the rpm range! (Each degree is about a 100rpm shift.)
01-30-2008, 03:05 AM
#18
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That's what I initially thought, but unless there was an error made in making the cam, the tool gives you correct information.
01-30-2008, 10:16 PM
#19
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Thanks Guys....Ken I will order it up next week. This evening I pulled the covers off (belt still looking good!) and I set the cam gears as close as I could to the wear marks on the face of the gear..just to see how much of a difference. There is much less of a transition period between the deep howling grunt up to 3000rpm, and the 5000rpm rush of horsepower...But I still have an uneventful flat spot between 3-4000rpm, and a little bit of a lurching /very very slight hesitation up top...I suspect it's the 23 year old coils giving up one me, because the problem seems somewhat intermittent depending on what I'm doing and what gear, and if I'm winding down or winding up etc etc. It's a pain in the *** pulling those covers off (the left anyway), but I want it to run as good as I can get it.....After I use the porken timing setup, I'll evaluate for the coils...But I'm fairly sure it needs them....My 850i was doing the exact same thing, slight hesitation right smack in the middle and a little lurching up top...coils straightened her right out.
01-31-2008, 02:21 AM
#20
Nordschleife Master
Well good luck on ordering them as he just said above he doesnt have any for sale atm 
and I HIGHLY doubt that your coils are the issue,
I would be checking other things, though the 85/86 engines do feel like they have a massive pickup at around 3500rpm.
and I HIGHLY doubt that your coils are the issue,
I would be checking other things, though the 85/86 engines do feel like they have a massive pickup at around 3500rpm.
01-31-2008, 03:15 AM
#21
Rennlist Member
cats could be clogged.
mk
mk
Thanks Guys....Ken I will order it up next week. This evening I pulled the covers off (belt still looking good!) and I set the cam gears as close as I could to the wear marks on the face of the gear..just to see how much of a difference. There is much less of a transition period between the deep howling grunt up to 3000rpm, and the 5000rpm rush of horsepower...But I still have an uneventful flat spot between 3-4000rpm, and a little bit of a lurching /very very slight hesitation up top...I suspect it's the 23 year old coils giving up one me, because the problem seems somewhat intermittent depending on what I'm doing and what gear, and if I'm winding down or winding up etc etc. It's a pain in the *** pulling those covers off (the left anyway), but I want it to run as good as I can get it.....After I use the porken timing setup, I'll evaluate for the coils...But I'm fairly sure it needs them....My 850i was doing the exact same thing, slight hesitation right smack in the middle and a little lurching up top...coils straightened her right out.
01-31-2008, 05:05 AM
#22
Nordschleife Master
yes you can use the tools from ken. they are great & I have a set myself. however, with that said they only allow you to index the cams in relation to their current position. since cam timing has the potential to be catestrophic if they are not timed properly, its best to start out from a known setting. The only way this can be done is to time the cams with the dial indicator per the shop manuals.
I have the later version of Ken's tool - not sure if any earlier versions had limitations on relative-only adjustment?
Of course, all this doesn't help Mr Surfrider, unless he can find 9 other people who want one too
01-31-2008, 03:11 PM
#23
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yes you can use the tools from ken. they are great & I have a set myself. however, with that said they only allow you to index the cams in relation to their current position. since cam timing has the potential to be catastrophic if they are not timed properly, its best to start out from a known setting. The only way this can be done is to time the cams with the dial indicator per the shop manuals.
If the cams have never been moved on the sprockets then you are good to go. but these cars are pushing 20 years old and have had numerous mechanics and PO's doing some really strange things.....
If the cams have never been moved on the sprockets then you are good to go. but these cars are pushing 20 years old and have had numerous mechanics and PO's doing some really strange things.....
