Timing and vaccuum with twisted wedge heads/cam

C0V3R · Aug 19, 2006

Trying to tune my new motor, and had a few issues with the timing pointer not being in the right place. I have now reset tdc and found that the car was actually starting and running fine at 22 degrees initial (no vac advance). There was no sign of pinging.

I have since reset the timing to 16 deg which I read to be more normal. How much timing can I expect to be able to reasonably run on this motor?

Also, I am curious as to what would be a reasonable/normal vacuum reading at itdle with a stage 1 cam on a new motor like this - I am pulling around 15in hg.

(Top one here http://www.trickflow.com/product/cam...specs_ford.asp)

5.0 roller shortblock (brand new)
TFS TW heads
TFS stage 1 cam
Weiand 7515 intake
Full MSD ignition
Edelbrock 1406
Tri-y's ceramic coated

5.0Droptop · Aug 19, 2006

Vac sounds about normal. Timing would sit from 10-18max I run 16* base timing.

fidstang · Aug 20, 2006

timing depends on a lot a variables with the engine and materials assembled with. You'll just have to try to set your timing to where you get the ping/spark knock and then turn it back 2-3 degrees.
I have the TFS stage one cam, Edelbrock RPM heads, Edelbrock RPM II intake and my intial is 18* with the spout out. I get the ping at about 21* intial timing.

To check for ping, set your timing to the desired advance. Take it for a ride, don't beat on it, get into fifth gear at about 1500rpm and slowly go to WOT. If it is going to ping you will hear it right away.

C0V3R · Aug 22, 2006

OK at least that sounds like my engine is not too dissimilar to yours. What is your timing curve like? When is the advance all in by?

Anyone else with TW heads out there? How much timing are you running.

evilwater · Aug 23, 2006

they say to run 10 to start out with but i cant get mine to run eather it dont idel right and when i drive it there is no power but the same thing happens at 18.

310stanger · Aug 23, 2006

i havent gone in near depth the observations that u have with this but i have the trickflow top end kit and if i remember right its set right now at 16 degrees advance. cam straight up.

Timing and vaccuum with twisted wedge heads/cam

C0V3R

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Timing and vaccuum with twisted wedge heads/cam

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