BRAD ARTHUR
01-16-2005, 07:08 PM
I've read all kinds of threads on timing, but here’s some more questions.
First off I am running a 1405 edel. Carb, edel. Cam,edel. Intake, stock exh manifolds, z&m hei, all this on a 304. With about 1500 miles on a overhaul.
I’ve been getting it to run good but not its best. While tunning it in still I’ve bounced between carb tunning and setting, timing initial ,mech vaccum.
I’ve read these motors run well from 3*-15*int.,w/34*-38*total. Advance. My question when setting timing and installing a distributor rotate eng in the direction it runs till #1 is at TDC on compression stroke. Timing mark on harmonic balancer should be at TDC, then instal distributor w/ rotor pointing at#1 .
1-(when leading edge of rotor contacts edge of #1 or center of rotor to center of#1?) Will it run @tdc, then adj timing.
2-will it make a difference if you are off 1 tooth or will you be able to adjust that with rotating the housing?
3 - is there a way to verify you are on the exact right tooth for the dist.
I am using a dialed timing light, before I had this I used a standard light. And was @ 55* total advance 12 int. And it ran good with no pinging. When I back ofF to 36 total runs good but not like it should.
I am trying to optimize performance and playing with mechanical springs and total timing, but think I’m off a tooth or something causing it to run best @55 *total.
I also changed accel pump nozzle from #28-#43.
I get a slight hesitation, from idle to take off in gear almost a hick up or stumble, but goes away when let off.
I also thought of running a CTO switch for the vac. Adv. Is it worth it? Which one?
Hope this all makes sense, sorry for the long post. I’ve been trying different things and can't get it. What’s everyone else running? Any comments or suggestions would help thanks.
First off I am running a 1405 edel. Carb, edel. Cam,edel. Intake, stock exh manifolds, z&m hei, all this on a 304. With about 1500 miles on a overhaul.
I’ve been getting it to run good but not its best. While tunning it in still I’ve bounced between carb tunning and setting, timing initial ,mech vaccum.
I’ve read these motors run well from 3*-15*int.,w/34*-38*total. Advance. My question when setting timing and installing a distributor rotate eng in the direction it runs till #1 is at TDC on compression stroke. Timing mark on harmonic balancer should be at TDC, then instal distributor w/ rotor pointing at#1 .
1-(when leading edge of rotor contacts edge of #1 or center of rotor to center of#1?) Will it run @tdc, then adj timing.
2-will it make a difference if you are off 1 tooth or will you be able to adjust that with rotating the housing?
3 - is there a way to verify you are on the exact right tooth for the dist.
I am using a dialed timing light, before I had this I used a standard light. And was @ 55* total advance 12 int. And it ran good with no pinging. When I back ofF to 36 total runs good but not like it should.
I am trying to optimize performance and playing with mechanical springs and total timing, but think I’m off a tooth or something causing it to run best @55 *total.
I also changed accel pump nozzle from #28-#43.
I get a slight hesitation, from idle to take off in gear almost a hick up or stumble, but goes away when let off.
I also thought of running a CTO switch for the vac. Adv. Is it worth it? Which one?
Hope this all makes sense, sorry for the long post. I’ve been trying different things and can't get it. What’s everyone else running? Any comments or suggestions would help thanks.