|
|
|
|
| Author |
|
|
Czar of C.R.A.P.
Join Date: Jul 2003
Posts: 2,323
|
Cam timing hypothetical
While first timing my cams I had both #1 and #4 cylinder opening on the same revolution. I realized my mistake and corrected. My question is however would the engine run this way though very poorly.
__________________
66 912 Coupe 84 Carrera Cab Hardtop HC3.4 Hyper Carrera 2005 Dodge Magnum 5.7 HEMI Cabriolet Racing And Performance C.R.A.P. Gruppe #1 Put on some C.R.A.P. and drive.... |
||
01-15-2007, 02:53 PM
|
|
|
GAFB
Join Date: Dec 1999
Location: Raleigh, NC, USA
Posts: 7,842
|
If you're not banging valves on the right bank, the engine will more or less run on the left bank. It'll sound terrible and the car won't get out of its own way, though.
__________________
Several BMWs |
||
|
01-15-2007, 03:59 PM
|
|
|
Registered
Join Date: May 2003
Posts: 3,346
|
It will not bang valves as long as the overlap setting was correct. It will however only run on 3 cylinders unless you can get a dizzy that fires 2 cylinders at the same time.
-Andy
__________________
72 Carrera RS replica, Spec 911 racer |
||
|
01-15-2007, 05:26 PM
|
|
|
Registered
Join Date: May 2004
Location: Boulder, Colorado
Posts: 7,275
|
Easy - any waste spark system would do that.
Instead of three pulses per revolution you'd have what - 1 for one rev, and 2 for the next? But would this really work? Generations of us have differentiated cams by the L shape and the rabbit ears. Not that I'm going to try. |
||
|
01-15-2007, 09:21 PM
|
|
|
Registered
Join Date: Jun 2004
Location: Rio Rancho, New Mexico
Posts: 1,325
|
You will have a three cylinder motor. Either the right side will work or the left side will work. Rotate the distributor rotor 180 degrees and you'll get the opposite 3 cylinders to fire.
There is a post from several months ago where a guy bought a poorly running 911 and discovered the cams were not timed 360 crank degrees apart. He rotated one of the cams 180 and had a great running 911 for a fixer upper price.
__________________
DOUG '76 911S 2.7, webers, solex cams, JE pistons, '74 exhaust, 23 & 28 torsion bars, 930 calipers & rotors, Hoosiers on 8's & 9's. '85 911 Carrera, stock, just painted, Orient Red |
||
|
01-16-2007, 08:28 PM
|
|
|
Czar of C.R.A.P.
Join Date: Jul 2003
Posts: 2,323
|
So in theory (and believe me I am not going to do this) it is only for discussion purposes. If you had a dual plug dual dizzy system you could re-route the wires and have a dual three cylinder system. What would this do to the torque of the engine having two cylinders pushing at the same time.
__________________
66 912 Coupe 84 Carrera Cab Hardtop HC3.4 Hyper Carrera 2005 Dodge Magnum 5.7 HEMI Cabriolet Racing And Performance C.R.A.P. Gruppe #1 Put on some C.R.A.P. and drive.... |
||
|
01-17-2007, 06:28 AM
|
|
|
|
Registered
Join Date: Jun 2004
Location: Rio Rancho, New Mexico
Posts: 1,325
|
Probably break the crankshaft.
__________________
DOUG '76 911S 2.7, webers, solex cams, JE pistons, '74 exhaust, 23 & 28 torsion bars, 930 calipers & rotors, Hoosiers on 8's & 9's. '85 911 Carrera, stock, just painted, Orient Red |
||
|
01-17-2007, 06:42 AM
|
|
|
Registered
Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,469
|
so that's what the problem was, eh?
__________________
https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 |
||
|
01-17-2007, 07:09 AM
|
|
|
Czar of C.R.A.P.
Join Date: Jul 2003
Posts: 2,323
|
I wish I had a twin plug twin dizzy to screw up no such luck. I did almost make this mistake while timing but corrected it before ever putting in the additional rockers so I don't even know if it would have turned over with everything connected. It would turn 360 with only the #1 and #4 intakes.
Again this is just one of those things that when you almost screw up you wonder what would have happened. It sounds like it would run this way.
__________________
66 912 Coupe 84 Carrera Cab Hardtop HC3.4 Hyper Carrera 2005 Dodge Magnum 5.7 HEMI Cabriolet Racing And Performance C.R.A.P. Gruppe #1 Put on some C.R.A.P. and drive.... |
||
|
01-17-2007, 08:37 AM
|
|
|
Registered
Join Date: May 2004
Location: Boulder, Colorado
Posts: 7,275
|
Might sound like a Harley?
|
||
|
01-17-2007, 11:50 AM
|
|
