Subject: Re: Camshaft Timing
Author: Hunter Jones
Date: Sep 7, 2001, 2:27 PM
Post ID: 1708153071
Hey Joe,
If memory serves the correct hole to time the cam with should be marked
with paint on the gear. If it is not the degree wheel would be the way to
go to check that. If you take it apart to look you may as well check it
anyway. In most cases the reason for multiple configurations is to get the
cam spot on.
More than likely your lack of top end is ignition timing. Make sure to
check that the advance mechanism is working properly. If it isn't the top
end power will be off. The best way to set it is to verify that it does
advance properly and then time the engine so that it is at the max advance
spec at the proper engine speed. Some of our old stuff advances too much or
not enough so this will make sure that when you're makin' the big power the
timing will be right.
Hope this helps.
Hunter
At 02:30 PM 9/6/2001 +0000, you wrote:
| Hello Loopers, My inquiry has to do with camshaft timing an engine with the original gear driven timing chest (pre-73), and on a machine that is not a Loopframe (V-7 Sport). I applogize for drifting off topic, but since the engine in my machine is so similar to an Ambassador engine, I thought you all wouldn't mind. And perhaps the discussion would be enlightening to fellow loopers. My concern is the lack of power my machine has in the upper half of the rpm range-it seems to run out of breath at about 4500-5000 rpm (redline indicated at 7500 rpm) in top gear, which is an indicated 80-90 mph. Mechanically, I believe it to be fine, showing 16k on the clock, valves adjusted & ignition timing set as per spec, compression reading of 150 & 152 psi. The air plenum and intake runners were removed and K&N filters substituted. It has the spec jets, needles, & slides. The original Shark Gills have been opened up substantially to where it's pretty roudy. Although I haven't done a proper plug chop, there is absolutely no indication that the mixture is lean; if anything it's on the rich side. I opted for a 110 x 18 rear tire vice the OEM 3.50 x 18 dimension because I wasn't comfortable with the load rating of the latter. Below 3000 rpm the bike is somewhat gutless, compared to my 750 Norton, but you can feel the torque building pretty quick between 3000 & 4500 rpm, especially in 3rd gear!;) But even slight grades on the interstate at 4500 in fifth cause a noticeable labor, and opening the throttle yields little more than more exhaust noise. I never hear any pinging but I always run premium fuel as per Guzziology recommendations. The V7 Sport cam is quite radical, only out-done by the B-10, and should provide a good amount of power on the top end. It just is not there! I am not the original owner of this bike, and it's past history is an unknown. I'm starting to suspect that the cam may be either timed too far advanced, or maybe even the wrong one installed. Looking at the factory tech manual last night revealed that the cam gear has 52 teeth and that there are 5 holes in the cam gear in which the drive dowel can be inserted. It apears there is plenty of room for error here, and I'm planning on fitting a degree wheel & chcking it as soon as I can tear myself off from riding it-still great fun to ride! Has anybody out there had any experiences that sound similar to this? Are there any words of wisdom that you could pass down to me about this process? Any help would be appreciated-Thanks! Joe in St Louis P.S. I do have a loop too - a '68 V700 _________________________________________________________________ |